RESEARCH ARTICLE          

Integrating in situ conservation of plant genetic resources with ex situ conservation management: Involving custodian farmers, benefits and their willingness to accept compensation

Eliet Amancah1, * ; Waldemar Mercado2 ; Luz Gómez-Pando3 ; Roberto Escalante4 ;

Diego A. Sotomayor5

1  Economic Valuation of Agrobiodiversity Group, Universidad Nacional Agraria La Molina, Lima, Peru.

2  Facultad de Economía y Planificación, Universidad Nacional Agraria La Molina, Lima, Peru.

3  Programa de Cereales y Granos Nativos, Universidad Nacional Agraria La Molina, Lima, Peru.

4  Profesor de la División de Estudios de Posgrado, Departamento de Economía, Universidad Nacional Autónoma de México, Mexico.

5  Departamento de Ingeniería Ambiental, Universidad Nacional Agraria La Molina, Lima, Peru.

* Corresponding author: amancah.08@gmail.com (E. Amancah).

Received: 25 September 2023. Accepted: 6 November 2023. Published: 28 November 2023.

Abstract

Compensation for custodian farmers to provide agrobiodiversity-conservation services in their farms (in situ) is an emerging global approach because it can generate public benefits when it comes to important plant genetic resources (PGRs) for food and agriculture. This review focused on: i) the integration of in situ conservation to the PGR management involving custodian farmers in a systematic conservation approach; ii) the private benefits obtained by custodian farmers to increase their willingness to actively participate in the conservation service; and iii) the willingness to accept (WTA) compensation of the farmers in providing conservation service relative to opportunity costs. The most recent approaches suggest the integration of in situ conservation with ex situ conservation management for efficient conservation programmes, especially in relation to governance of local agrobiodiversity. Involving custodian farmers in the comprehensive genetic-improvement system appears to be an activity that increases their willingness to participate in agrobiodiversity conservation schemes. Farmers receive private benefits, which are simultaneously reflected in the provision of public benefits. Therefore, WTA compensation, which employs mechanisms in the design of payments for better agro-environmental conservation services, controls the opportunity costs. Overall, farmers seem willing to participate in any type of compensation scheme that is proposed in the different countries. Furthermore, it is possible to capture the WTA, therefore significant progress requires more studies of primary schemes, in-depth analysis to capture farmers' preferences on economic, socio-cultural, and environmental factors in scheme design, and the implementation of incentive policies designed with pragmatic tools.

Keywords: In situ conservation; systematic conservation; custodian farmer; opportunity cost; benefit; willingness to accept; compensation.

DOI: https://doi.org/10.17268/sci.agropecu.2023.038

Cite this article:

Amancah, E., Mercado, W., Gómez-Pando, L., Escalante, R., & Sotomayor, D. A. (2023). Integrating in situ conservation of plant genetic resources with ex situ conservation management: Involving custodian farmers, benefits and their willingness to accept compensation. Scientia Agropecuaria, 14(4), 447-464.

1. Introduction

Agriculture is currently facing unprecedented challenges due to rapidly increasing human population and unstable growth environment (Ramankutty et al., 2018; Struik & Kuyper, 2017). To address the increasing worldwide demand for food, the strategy applied by many countries where high levels of agrobiodiversity (Table 1) exist is to expand the distribution of more productive and modern crop varieties, which can increase production (Joshi et al., 2020b; Yang et al., 2020). However, most of these intensified agriculture practices do not implement plans for conservation of high levels of agrobiodiversity. Thus, risk of irreversible loss of some species and rare varieties in the national and international market appears (Egli et al., 2018). This risk increases when many custodian farmers (Table 1) prioritise increase in their income, and focus on agricultural inten-sification (Ebert et al., 2023; Singh et al., 2019; Sumalan et al., 2021) by modifying their product portfolio into monoculture systems or homo-genising their crop varieties (Bedoya-Perales et al., 2018; Gajanana et al., 2015).

Table 1

Main concepts in the management and overall cost of agrobiodiversity on farm integrated to conservation

Other drivers of change in agrobiodiversity include changes in occupation, migration and abandon-ment of agricultural knowledge typical of landraces (Castillo et al., 2021; Guzzon et al., 2021; Zimmerer et al., 2019). Moreover, agrobiodiversity is also impacted by natural and man-made disasters, epidemics, pests, war or insurgency and over-exploitation of land due to overgrazing (Joshi et al., 2020a; Tiemann et al., 2015). Similarly, sufficient evidence supports that climate-change factors such as changes in precipitation, humidity, high and low temperatures and deglaciation influence the current vulnerability of agricultural systems (Lozano-Povis et al., 2021). Thus, a 2% reduction in agricultural production every decade due to climate change has been reported (Pachauri et al., 2014).

All these aforementioned threats could lead to a decrease in agrobiodiversity, that is, they directly cause loss of genetic diversity, which results in the extinction of varieties that carry genes that are important for genetic improvement of crops to increase global production (Brush, 2000; Zimmerer & De Haan, 2017). These plant genetic resources (PGRs) are widely used for food and agriculture, thus, there is a need to ensure that crops adapt to the challenges of sustainably producing more food using fewer inputs and adapting to climate change, changes in consumption patterns and overarching threats related to emerging diseases (Ebert, 2020). In summary, the success of crop-breeding programmes, among others, mainly depend on the availability of genetic variability for different traits of interest (Nordhagen et al., 2017; Sumalan et al., 2021).

Although in the last four decades, many organisa-tions and individuals worldwide have concentrated their efforts on conserving samples in ex situ conservation programmes through germplasm banks and in protected areas (in situ or on-farm conservation), these efforts do not actively conserve all genetic diversity (Brush, 2000; Engels & Ebert, 2021b; Rojas et al., 2014). Many research-ers point out that in the planning of proposed conservation programmes, especially in deve-loping countries, a profound change is needed to transition from the current ex situ conservation to a more systematic and complimentary basis for the management of crop wild relatives (Rometsch et al., 2023) and native varieties (Maxted & Brehm, 2022). These processes involve both evidence-based conservation using ex situ and in situ (on-farm) techniques to conserve the range of diversity in PGRs (Dulloo, 2021; Rajpurohit & Jhang, 2015). This systematic conservation planning (Table 1) incorporates the role of custodian farmers in the conservation process because of their great im-portance in the co-evolution of genetic resources (Sumalan et al., 2021). In addition, in situ conser-vation can maintain cultural and heritage attributes (Brush, 2000; Madden, 2019; Pallante et al., 2016).

In situ conservation focuses on rescuing/ supporting custodian farmers that are only present in some rural areas in each country; however, a conservation plan cannot be established for free (Pascual & Perrings, 2007). Whereas many of these custodian farmers have implemented government policies that focus on an incentive mechanism that improves their status quo, these policies are prone to inefficiency in terms of cost. Some researchers suggest that the opportunity-cost-and-benefit analysis of conservation can play an important role in concentrating efforts to this important agrobiodiversity-conservation task (Juvančič et al., 2021; Narloch et al., 2011; Padulosi & Drucker, 2018; Pallante et al., 2016; Tyllianakis & Martin-Ortega, 2021). Therefore, available studies that focused on the opportunity-cost-and-benefit as factors that influence the willingness of farmers to agree to adapt more systematic in situ conservation programmes of plant genetic resources were reviewed.

By exploring the literature, the aim of this review was to identify gaps in the literature on the methods of determining the opportunity costs (Table 1) and benefits obtained by custodian farmers through their willingness to accept (WTA) compensation that is closer to the true indicator of the costs incurred by them in providing the in situ conservation service for agrobiodiversity.

2. Methodology

This study is based on a literature review. First, it was defined the most used terms that fit into the planning of in situ (on-farm) conservation systems by custodian farmers in a more systematic and integrated of plant genetic resources conservation approach (Table 2).

Table 2

Criteria for inclusion of references in this section

* Some studies were about agrobiodiversity conservation, but at least one of the objectives was to maintain local crop varieties and their wild relatives.

Figure 1. Global distribution of studies regarding farmers’ willingness to accept compensation for the management of agrobiodiversity. The 11 strategies identified are listed within the legend with different symbol colours in the map.

This approach facilitates the linkages between in situ and ex situ conservation methods, thus promoting participatory manage-ment of PGRs. Then, this approach was associated to the analysis of benefits (public and private) of in situ conservation to illustrate the net benefits for custodian farmers who decide to provide the conservation service of local breeds and wild crops. Finally, the opportunity costs by the farmers in conserving agrobiodiversity was reviewed, which is related to the approaches of their WTA compensation and participation in providing con-servation service, thus revealing the opportunity costs to the farmers. This review focuses on published literature about farmer incentive tools based on stated preference methods. To achieve this objective, the SPIDER tool was used (Methley et al., 2014) to identify studies that focus on the WTA compensation of farmers who provide the service of plant genetic resources conservation, which incorporates the benefits.

This study aims to provide a complete characteri-sation of the management status of PGR conser-vation and agrobiodiversity for the adoption of plant genetic resources conservation programmes by farmers. Hence, only up-to-date conservation (in situ and ex situ) information was used. In addition to the identification of public benefits in an integrated conservation system and oppor-tunity costs for the provision of conservation service, some criteria were applied, Table 2 lists the inclusion criteria used in the eligibility screening.

3. The breadth of studies on farmers’ WTA com-pensation for management of agrobiodiversity

The descriptive statistics of the studies found in this subject are listed in Table 3. The complete list of studies reviewed can be found on Appendix A. The information that they contain comes from 28 countries in the world, of which 14 of them were registered in China (Figure 1), and covers the period from 2006 to 2023.

The type of strategy in the WTA compensation proposal practiced during the development stage comes from 14 studies that referred to payments for ecosystem services, and nine studies on agro-environmental-services. Three investigations were carried out for ecological programmes, and eight studies were performed for sustainable use of agricultural residues. Five studies focused on agrobiodiversity conservation in which three were related to PGRs and two were related to animal genetic resources (Table 4).

Table 3

Descriptive statistics of the reviewed studies

Table 4

WTA compensation from farmers based on the proposed scheme

Note: *The value negative WTA can be referred to as a response to unwillingness to participate or protest the price offered in those primary evaluation studies. **The studies were grouped into six types of strategies: Agro-Environmental Services (AES), Payment Ecosystem Services (PES), Stalk return (or Waste recycling), Ecological Programme (EP), and Agrobiodiversity “plant genetic resources” Conservation Services (ACS) (Details see Appendix A).

4. WTA compensation as a mechanism for custodian farmers

The economic cost of biodiversity services is significant (Narloch et al., 2011). One of the incentive mechanisms that has been widely used to guarantee public services obtained from eco-systems is the payment for environmental services (PES), which consists of directly compensating the environmental-service provider for the opportu-nity costs of conservation (Amigues et al., 2002). Theoretically, this instrument maximises scarce conservation funds, although in developing countries, they often provide the dual objective of conserving and enhancing economic and social well-being (Salzman et al., 2018).

The application of PES in the context of agro-biodiversity has been limited. In fact, large-scale PES are slowly increasing internationally. Some examples of payment schemes related to the conservation of genetic resources can be found as part of the Payment for Agrobiodiversity Conservation Services (PACS) approaches that were implemented using hypothetical approaches in India (Narloch et al., 2013), Nepal Zambia (Wainwright et al., 2019b), Peru, Ecuador and Guatemala (Drucker & Ramirez, 2020; Padulosi & Drucker, 2018).

However, many challenges associated with the sustainability of agro-environmental contracts have been identified. They include the asymmetry of information on the decision making by the custodian farmer (Wainwright et al., 2019b), prospects of farmer willingness to participate in the programmes (Juvančič et al., 2021), inclusion of transaction costs (Table 1), uncertainty of property rights, collective coordination (Narloch et al., 2017; Villamayor-Tomas et al., 2021; Villamayor-Tomas et al., 2019), lack of incentives for business connection (Bellon et al., 2015b; Gotor et al., 2017) and gaps in conservation activities that spatially and temporally exists between PES and PACS. These problems can overlap in the identification of the incentives for farmers (Tyack et al., 2020).

In accordance with public benefits, the currently existing incentives for PACSs have been promoted by governments or many organisations (Wainwright et al., 2019b). Unfortunately, the private sector gets fewer incentives for agricultural diversity. However, market-based actions involve incentives (Tyack et al., 2020). Identifying the mechanisms for effective participation of the private sector in such programmes is necessary. For example, the transaction cost of the diversity of crops can improve economic benefits through the development of new markets (market niches), production of valuable aggregates (innovative products) and incentivising the market for consumption of local varieties of crops (Table 1), which can ultimately generate positive effects on the public benefits (Narloch et al., 2013; Pallante et al., 2016; Pascual & Perrings, 2007).

Incentive mechanisms must be aligned to enhance private benefits because these will reflect in better public benefits (Bellon et al., 2015b; Gotor et al., 2017). Existing preferential approaches using service bidding tools have demonstrated high cost–benefit relationships that can be associated with agro-environmental conservation program-mes (Juvančič et al., 2021; Wainwright et al., 2019a). These techniques have been used in recent times with greater interest by researchers to calculate the compensation for agro-environmental-conser-vation services based on declared preferences. These techniques include the contingent valuation (CV) method or choice experiment (CE) (Da Motta & Ortiz, 2018; Sardaro et al., 2016). The difference between CV and CE is basically the employed survey statement-collection tool in which the CE analyses used specific criteria. However, this method can confuse the farmers if the criteria are not well defined (Li et al., 2021). These calculations are made based on the WTA compensation because they are directly focused on the service provider (Tao & Wang, 2020).

According to Wainwright et al. (2019b), WTA compensation also allows highlighting non-economic limitations because it is a tool that can overcome information asymmetries by providing the custodian farmer an incentive to reveal his true opportunity cost. WTA compensation is a measure of the Hicks’ consumer surplus (net of the price received) under the situation where an agent is asked to voluntarily give up a good or provide a sevice (Carson, 2000). In other words, the economic agent (farmer) has a legal right to the environmental good and is asked to renounce this right (Li et al., 2020).

The farmer, as a service provider, is assumed to agree to participate in PACS only if the payment offer that establishes a contract is more than or equal to the value of WTA compensation in monetary terms (Haile et al., 2019). Therefore, recent works have shown that the implementation of the differentiated payment would be more profitable (Da Motta & Ortiz, 2018; Juvančič et al., 2021), thus achieving higher levels of social benefits (Bellon et al., 2015a).

With regards to the consumption of agro-environmental goods or agrobiodiversity by the farmer, the question is who will participate in the conservation of PGRs. As mentioned earlier, PGRs are semi-public goods (), this depends on income () and the price of the market goods consumed by a farmer (). Farmers cannot freely choose certain varieties crops (). The farmer utility function is , and under the premise of fixed disposable income, farmers seek to maximise utility. Therefore, conditional demand function of semi-public goods is . The WTA compensation of farmers to provide agrobiodiversity-conservation service can be explained as shown in Figure 2, which is used by some researchers in water-resources programmes (Li et al., 2021).

Figure 2. WTA for agrobiodiversity conservation of native crop varieties. Initially, the individual consumption of an agrobio-diversity farmer is , and the utility is represented by curve . If the use of genetic resource (seeds) by the farmer decreases from to , theoretically, the utility level falls to . Therefore, the farmer status becomes . On the other hand, the farmer will also benefit from agrobiodiversity. Thus, his level will become with , and the state changes to . The logic of WTA is to grant monetary compensation to farmers to maintain the same level of utility (). Therefore, WTA that guarantees that the farmer state remains unchanged after continuing to use native varieties to maintain resources is .

We can express the WTA compensation expected by the farmers using the following formula. Although it is used in other approaches (Chu et al., 2020; Feng et al., 2018; Wooldridge, 2015), it can be adopted in these circumstances.

Where expected WTA compensation () of the response is related to landraces or variety-conservation programmes. is the degree of WTA compensation for options, and represents the WTA compensation probability.

5. Global evolution of the conservation of PGRs for food and agriculture

Many organisations and individual scientists worldwide have conducted efforts to conserve PGRs. During the period from 1961 to 2023, systematic conservation planning for governance of agrobiodiversity has also expanded to include multiple international covenant on access and benefit sharing (Dempewolf & Krishnan, 2023; Negri et al., 2009), as detailed in the International Treaty on Plant Genetic Resources for Food and Agriculture (Table 1), Convention on Biodiversity, Nagoya Protocol, and Plan of Action for Plant Genetic Resources for Food and Agriculture (2010). During this time, more than 53 relevant events were conducted to establish and develop instruments related to the conservation and sustainable utilisation of PGRs (Dulloo, 2021; Farooq & Pisante, 2019; Sonnino, 2017).

Historically, the international agricultural research centres focused on accession collection systems and ex situ conservation (Brush, 2000; Engels & Ebert, 2021b; Sonnino, 2017). This conservation type involves conserving species outside their agroecosystems. The current state of ex situ conservation and management of PGRs around the world is shown in Figure 3 which illustrates that approximately 5.4 million accessions of germplasm have been collected in 2021, indicating that more than 50,000 plant species are being conserved in over 1750 genebanks worldwide (FAO, 2019; Farooq & Pisante, 2019; Pilling et al., 2020).

Figure 3. Current status of PGRs for food and agriculture worldwide [based on the FAO Genebank Standards (FAO, 2019), which is adopted from Pilling et al. (2020) and Engels & Ebert (2021b)].

Despite this progress, even if these accessions meet high standards of facilities for ex situ conser-vation, genebanks will likely be insufficient to respond to the alarming increase in threats posed by climate change and the demand for more food, especially in cases of landraces and wild crop va-rieties because they are poorly represented. Non-staple crops account for only 2% of the stored materials in genebanks (Farooq & Pisante, 2019).

In 1967, the FAO Conference introduced the issue of complementarity between ex situ and in situ strategies for the conservation of genetic resources. However, only few countries concen-trated on working in both directions as a conservation system, and their initiatives were not systematically focused. According to the latest FAO report, 30,000 in situ conservation sites exist worldwide, but only 9% have management plans for wild crop varieties (FAO, 2019; Pilling et al., 2020). The closest plan that integrates in situ conservation into systematic governance of PGR is found in Vietnam in its ‘Seeds for Needs’ programme where the Southeast Asian Regional Community and Can Tho University are collabo-rating for sustainable conservation. ‘Seeds for Needs’ was established to consider plant-breeding participation where custodian farmers have the opportunity to make decisions at all times to improve crop varieties (Fadda et al., 2020). On the other hand, since Swaminathan (2002) proposed the in situ conservation that uses a community approach, two sustainable systems have been reported. One is the ‘Scarascia Mugnozza Com-munity Genetic Resources Centre’ located in Chennai, India, with Italian funding (Sonnino, 2017). The other is the ‘Potato Park’ in Peru with international financing where families perform conservation services for which they receive compensation (Graddy, 2014). It is also good to mention that there are special agroecosy-stems where the genetic diversity and wild relatives of some crops stand out. Just as an example, we mention barley here, the diversity of native varieties of this crop exists in many parts of the world, but in the most prosperous agroecosystems found in Ethiopia and East Asiatic, however, due to opportunity cost, some areas are being replaced by commercial varieties (Visioni et al., 2023).

Globally, more than 56 incentive-mechanisms structures have been identified (Bellon et al., 2015a; Jarvis et al., 2011). Several examples of compen-sation schemes exist to include the cost that is not rewarded in the market by in situ conservation, including both genetic diversity and cultural identity (Joshi et al., 2020a). However, developing efficient governance of genetic resources is necessary.

6. Systematic planning for farm (in situ) conservation of PGRs for food and agriculture

This section highlights the importance of mana-ging in situ conservation of agrobiodiversity (on-farm) as a systematic mechanism for benefit analysis. The most recent approaches suggest the integration of in situ conservation with ex situ conservation management to achieve efficient management of PGRs, especially in terms of governance of local agrobiodiversity (Figure 4). One of the key points in integrating systems and concentrating efforts is the incentive mechanism for farmers who conserve landraces and wild crop varieties. This approach should focus on the follo-wing: i) enhancing trust and mutual understanding of the systematic conservation among stake-holders and ii) providing differentiated incentive mechanisms that consider decision making, benefits and opportunity costs for the custodian farmer which are explained below.

The implementation of a participatory approach to genetic improvement that allows coordination between in situ and ex situ conservation can enhance trust and increase the effectiveness of the adoption of in situ conservation programmes by custodian farmers or the community (Engels & Ebert, 2021b; Fadda et al., 2020; Louafi et al., 2021; Maxted & Brehm, 2022). Agrobiodiversity-conser-vation strategies include ex situ and in situ approaches (Rajpurohit & Jhang, 2015; Ramirez‐Villegas et al., 2020), which are not mutually exclusive but are complementary components of conservation programmes (Sonnino, 2017). There-fore, developing a multidimensional appr-oach is needed for sustainability of local agriculture without damaging the social, economic and environmental integrity (Farooq & Pisante, 2019).

In situ conservation (on-farm) can certainly conti-nue because the participation of farmers as human component is a vital part of in situ conservation, which can drive evolution and ensure availability of germplasm for future generations while simultane-ously enforcing tough selection pressure through active management to obtain desirable charac-teristics (Bellon et al., 2015a; Gotor et al., 2017). Similarly, willingness to participate in conservation programmes has been shown to increase when the farmer is involved in the genetic-improvement approach (Fadda et al., 2020), thereby generating more trust against more risks faced by the custodian farmer (Rojas et al., 2014). Many me-thods are available for integrating the custodian farmer to a systematic conservation programme, although most of them are expensive and inefficient (Jarvis et al., 2006). In the present study, we identify two alternatives that are highly recommended by experts. The first one refers to facilitating access by custodial farmers to the germplasm bank materials (seeds), and the other involves the establishment of a low-cost early-monitoring plan (Bellon et al., 2017; Drucker & Ramirez, 2020; Zair et al., 2021).

Figure 4 shows the iterative cycles that require monitoring. Periodic updating of the collections is needed to continue the conservation cycle. However, the farmers would unlikely be able to integrate some active accessions (sample for the genebank) (Maxted et al., 2000), which is an additional process. This limitation can be overcome by implementing payment mechanisms for conservation services that include training according to the needs of the areas with high agrobiodiversity (Maxted et al., 2016; Midler et al., 2015; Narloch et al., 2013; Wainwright et al., 2019b; Zimmerer et al., 2019). As an example, we can cite a pilot monitoring model that was reported in Ecuador that used cell-phone messages where farmers sustainably and quickly adopted an agricultural programme (Larochelle et al., 2019).

The purpose of linking in situ conservation to a complete PGR governance system is related to the decision making of the farmers regarding the use and management of landraces and wild crop varieties (Allen et al., 2019; Maxted et al., 2016). Researchers face the enormous task of imple-menting participatory-action approaches to ensure that farmers or communities, who perform conservation on their farms, are the people who decide to safeguard genetic resources in the programme. Indeed, the site for its intervention is defined by analysing many factors associated with significant genetic diversity of the crop (agro-ecological), socio-economic and cultural factors.

Because market incentives and intensive pro-duction systems favour a limited base of improved crop varieties, many countries have experienced a decline not only in agrobiodiversity but also in the human capacity to conserve native and wild varieties of crops. Therefore, they urgently need to implement mechanisms that incentivise the farmers. The provision of public benefits necessitates state-policy interventions because of the important public services provided by the in situ conservation of agrobiodiversity. Many of these benefits are regional, national and even reflected in global exchange (Narloch et al., 2011).

Figure 4. Iterative cycles of PGRs and possible pathways of benefits from the in situ conservation linkage in an integrated system. An integrated in situ and ex situ conservation system primarily refers to the exchange and transfer of materials in both directions. In situ back-up accessions periodically go via the conservation route to the germplasm bank (registration, germination test, packaging, and storage). The periodic monitoring plan should be registered and systematised where in situ conservation continues to provide private and public benefits (social, economic, and environmental). Therefore, PGRs are conserved in both approaches, and users actively use them (formal germplasm supply) (Maxted et al., 2016). This process allows improvement of the inventory of crop genetic diversity. In addition, it reduces management costs (See Table 1) in the ex situ part. However, emphasising that monitoring efforts focus on rare genetic variation is important (Leroy et al., 2018; Zair et al., 2021). Currently, it also provides the incentives that the farmers need to manage the evolution of the crops in their fields (Bellon et al., 2017). In situ conservation is an extremely complex process, as suggested by many studies. Efforts should be focused on areas with high agrobiodiversity, particularly in areas where the species originated and where the probability of complying with the conservation of agrobiodiversity at all levels will be greater (Jarvis et al., 2011). The monitoring carried out by the ex situ part clearly should not disturb the natural-evolution process in the germplasm (Maxted et al., 2016).

However, in situ conservation decisions are made at the farm level in which benefits are received and costs are incurred by individual households (Midler et al., 2015; Nordhagen et al., 2017). Pascual and Perrings (2007) were the first to report the different decision criteria taken by conservationist farmers in their desire to undertake regenerative actions for in situ agrobiodiversity-conservation programmes. They identified the following four important criteria: a) role as manager of their lands, b) economic benefits derived from diversity, c) ecological suitability and d) farmer perception on financial and economic feasibility. On the other hand, we also found other reports that identified more important socio-cultural criteria related to maintaining the quality of agricultural land for future generations, food security and climate change (Sardaro et al., 2016). The most recent advances in decision making by custodians farmers of diversity have multiple goals (Isbell et al., 2021; Wainwright et al., 2019b). Decision making changes according to the rural areas, customs, farmer characteristics and farm structure (Sardaro et al., 2021).

7. Identifying public and private benefits for custodian farmers in conservation

The use of agrobiodiversity is of concerned for the good of the public in general and private indivi-duals, which is why it is known as the provision of a semi-pure public good (Smale et al., 2004). From an economic perspective, public good refers to a benefit that does not involve rivalry and exclusion. From this perspective, an in situ conserved plant genetic diversity can be used by two individuals, and they can be equally satisfied, which means that no rivalry exists. Likewise, it is not exclusive because preventing another individual from also benefiting from its conservation is almost impossible (Bellon et al., 2015a; Pascual & Perrings, 2007).

Hence, recognising that the long-term manage-ment of genetic resources is for the good of the public is necessary. Therefore, countries provide multiple public benefits (Pilling et al., 2020). These benefits are related to not only the plant genetic diversity but also the agro-ecosystem balance (environmental services) and wellbeing of huma-nity (external benefits of on-farm agrobiodiversity) (Bellon et al., 2015b; Jarvis et al., 2008; Krishna et al., 2013; Wainwright et al., 2019b). Simultaneously, genetic resources also appear as good to private individuals because they provide private benefits to the farmers or communities that conserve them (Bellon et al., 2015a; Hanley & Perrings, 2019).

The importance of conserving the plant genetic diversity for future global food security primarily lies in the establishment of germplasm banks for plant breeders and other future users. In situ conservation allows continuation of the adaptation and permanent evolution of local crops. Similarly, it includes the management of wild cop varieties, that is, it ensures the generation of new genetic combinations in time and space. In addition, conservation of agrobiodiversity in the farm provides multiple socio-cultural, economic and environmental services (see Figure 3). However, the costs are borne by the farmer. In fact, market failure occurs because the value of a semi-public good is not captured in the market transactions. In the absence of mechanisms that internalise such values as a public good can lead to the mainte-nance of less than socially desirable levels of agrobiodiversity (Juvančič et al., 2021; Wainwright et al., 2019b). Even if there is an implemented mechanism to conservation of agrobiodiversity, but it has not considered the decision-making of the farmers, it would be bound to be inefficient, (Bellon et al., 2015a).Therefore, decision making is at different levels on a spatial scale.

On a spatial scale (Figure 5), the structure of the stream of public and private benefits generated by in situ conservation of PGR exhibits a horizontal order (farm → regional → global) (Allen et al., 2019; Pascual & Perrings, 2007). At the global level, close networks of global, national and local gover-nments are responsible for politically directed ex situ conservation programmes (Aubry, 2023; Engels & Ebert, 2021a; Khoury et al., 2015). The farm and regional levels involve direct in situ conservation and indirect ex situ conservation. Separating the benefits according to the levels is a great challenge. The incentive mechanisms for the conservation of agrobiodiversity are determined by political decisions. Thus, different countries have intervened using compensation mechanisms for the conservation services (Jarvis et al., 2011). However, deficiencies and management limita-tions remain in the integration of complex PGR conservation systems (Börner et al., 2017; Maxted et al., 2016). Thus, the problems are not only political (Perrino & Perrino, 2020) but also scientific and technical.

Figure 5. Some potential benefits that are generated in the in situ agrobiodiversity conservation under a comprehensive system. Decision making for each scale. 1. The farmer always decides the species or variety to grow based on multiple criteria. 2. At the national level, decisions are made on the incentive mechanisms to be implemented for in situ conservation. 3. Linking the conservation approaches to improve efficiency. 4 Implementing international agreements in a global scale to promote conservation, such as the Convention on Biological Diversity in Goal 3 of Aichi where the need to implement incentive mechanisms is emphasised (CBD, 2013). The link between the Ⓑ ex situ and Ⓐ in situ conservation approaches shows important contributions in both types of monitoring (genetic variation and the incentives required). Adopting the strategy of diversifying the species or varieties of crops is rational behaviour of the farmer. Therefore, knowing the (I) private benefits for the farmer allows proposing mechanisms that satisfy their priorities because its continuity also provides (II) public benefits. Finally, the decision to create incentive mechanisms is political (Perrino & Perrino, 2020), but the decision to adopt them depends on the farmers or community.

Identification of the individual benefits and opportunity costs creates an important role for public policy to ensure that concepts on the values of agrobiodiversity services are fully integrated into their PGR conservation decisions, which can manifest themselves in differentiated incentive mechanisms (Juvančič et al., 2021). Hence, simpler and more practical tools are needed to assess the farmer objectives (Wainwright et al., 2019b) because the farmer households are not static but are constantly facing new challenges and opportu-nities, particularly those caused by economic development, environmental and socio-cultural changes. In many cases, they affect the value of maintaining intra-specific or inter-specific diversity, which are mainly associated with the benefits to be obtained from the decisions (Bellon et al., 2017).

8. Conclusions

Compensation to custodian farmers who provide public benefits from conservation of PGRs in farms (in situ) is currently a developing area of research worldwide because of the increasing loss in agrobiodiversity and pressure on farmers to intensify their farms. PGRs face extinction challenges. Thus, proposing more efficient state policies for the management of genetic resources is urgent. Despite the existence of agro-environmental schemes (AESs), conservation of PGRFA has not yet found an instrument to cover the asymmetries in the provision of this type of goods. This study reviews the conservation status of PGRs. For the first time, we present evidence that allows us to focus on an integrated link between in situ and ex situ conservation to generate compensation mechanisms for custodian farmers in terms of private benefits.

We found that some countries provided reports on their proposed conservation programmes. However, worldwide information on in situ conservation is relatively scarce. Some reports from the European countries have proposed an integrated conservation perspective in which AES programmes generate links from integrated monitoring to ex situ conservation.

In general, farmers seem willing to participate in any type of compensation scheme that is proposed in different countries. Furthermore, it is possible to capture WTA, so significant progress would be based on generating an assessment of co-benefits through a comprehensive in situ and ex situ conservation system. If achieved, this would open broader perspectives on how custodian farmers show the true opportunity cost by establishing national conservation networks as government policy.

Acknowledgments

This work received funding from the National Council of Science, Technology and Technological Innovation (CONCYTEC), National Fund for Scientific, Technological Development and Technological Innovation (FONDECYT) as part of the Doctoral Program in Economics of Natural Resources and Sustainable Development at Universidad Nacional Agraria La Molina, Lima, Peru.

ORCID

E. Amancah  https://orcid.org/0000-0002-3906-0620

W. Mercado  https://orcid.org/0000-0001-7167-9581

L. Gómez-Pando https://orcid.org/0000-0001-5536-5179

R. Escalante https://orcid.org/0000-0003-0555-0266

D. A. Sotomayor  https://orcid.org/0000-0003-0534-5625

References

Ahiale, E. D., Balcombe, K., & Srinivasan, C. (2019). Determinants of Farm Households’ Willingness to Accept (WTA) Compensation for Conservation Technologies in Northern Ghana. Bio-Based and Applied Economics, 8(2), 211–234. https://doi.org/10.13128/bae-8931

Allen, E., Gaisberger, H., Brehm, J. M., Maxted, N., Thormann, I., Lupupa, T., Dulloo, M. E., & Kell, S. P. (2019). A crop wild relative inventory for Southern Africa: A first step in linking conservation and use of valuable wild populations for enhancing food security. Plant Genetic Resources, 17(2), 128–139. https://doi.org/10.1017/S1479262118000515

Amigues, J.-P., Boulatoff, C., Desaigues, B., Gauthier, C., & Keith, J. E. (2002). The benefits and costs of riparian analysis habitat preservation: a willingness to accept/willingness to pay contingent valuation approach. Ecological Economics, 43(1), 17–31.

Aubry, S. (2023). Genebanking plant genetic resources in the postgenomic era International Treaty on PGRFA. Agriculture and Human Values, 40(3), 961–971. https://doi.org/10.1007/s10460-023-10417-7

Bedoya-Perales, N. S., Pumi, G., Mujica, A., Talamini, E., & Domingos Padula, A. (2018). Quinoa expansion in Peru and its implications for land use management. Sustainability, 10(2), 532. https://doi.org///doi.org/10.3390/su10020532

Bellon, M. R., Dulloo, E., Sardos, J., Thormann, I., & Burdon, J. J. (2017). In situ conservation—harnessing natural and human‐derived evolutionary forces to ensure future crop adaptation. Evolutionary Applications, 10(10), 965–977. https://doi.org///doi.org/10.1111/eva.12521

Bellon, M. R., Gotor, E., & Caracciolo, F. (2015a). Assessing the effectiveness of projects supporting on-farm conservation of native crops: evidence from the high Andes of South America. World Development, 70, 162–176. https://doi.org///doi.org/10.1016/j.worlddev.2015.01.014

Bellon, M. R., Gotor, E., & Caracciolo, F. (2015b). Conserving landraces and improving livelihoods: how to assess the success of on-farm conservation projects? International Journal of Agricultural Sustainability, 13(2), 167–182. https://doi.org///doi.org/10.1080/14735903.2014.986363

Börner, J., Baylis, K., Corbera, E., Ezzine-de-Blas, D., Honey-Rosés, J., Persson, U. M., & Wunder, S. (2017). The effectiveness of payments for environmental services. World Development, 96, 359–374. https://doi.org/10.1016/j.worlddev.2017.03.020

Brush, S. B. (2000). Genes in the field: on-farm conservation of crop diversity. IDRC.

Buckley, C., Hynes, S., & Mechan, S. (2012). Supply of an ecosystem service—Farmers’ willingness to adopt riparian buffer zones in agricultural catchments. Environmental Science & Policy, 24, 101–109. https://doi.org/10.1016/j.envsci.2012.07.022

Carson, R. T. (2000). Contingent valuation: a user’s guide. ACS Publications. https://doi.org/10.1021/es990728j

Casañas, F., Simó, J., Casals, J., & Prohens, J. (2017). Toward an evolved concept of landrace. Frontiers in Plant Science, 8, 145. https://doi.org/10.3389/fpls.2017.00145

Castillo, C. P., Jacobs-Crisioni, C., Diogo, V., & Lavalle, C. (2021). Modelling agricultural land abandonment in a fine spatial resolution multi-level land-use model: An application for the EU. Environmental Modelling & Software, 136, 104946. https://doi.org/10.1016/j.envsoft.2020.104946

CBD. (2013). Quick guides to the Aichi Biodiversity Targets. https://www.cbd.int/doc/strategic-plan/targets/compilation-quick-guide-en.pdf

Christensen, T., Pedersen, A. B., Nielsen, H. O., Mørkbak, M. R., Hasler, B., & Denver, S. (2011). Determinants of farmers’ willingness to participate in subsidy schemes for pesticide-free buffer zones—A choice experiment study. Ecological Economics, 70(8), 1558–1564. https://doi.org/10.1016/j.ecolecon.2011.03.021

Chu, X., Zhan, J., Wang, C., Hameeda, S., & Wang, X. (2020). Households’ Willingness to Accept Improved Ecosystem Services and Influencing Factors: Application of Contingent Valuation Method in Bashang Plateau, Hebei Province, China. Journal of Environmental Management, 255, 109925. https://doi.org/10.1016/j.jenvman.2019.109925

Da Motta, R. S., & Ortiz, R. A. (2018). Costs and perceptions conditioning willingness to accept payments for ecosystem services in a Brazilian case. Ecological Economics, 147, 333–342. https://doi.org/10.1016/j.ecolecon.2018.01.032

Dempewolf, H., & Krishnan, S. (2023). Our shared global responsibility : Safeguarding crop diversity for future generations. 120(14), 1–8.

Drucker, A. G., Mponya, N. K., Grazioli, F., Maxted, N., Brehm, J. M., & Dulloo, E. (2023). Community-Level Incentive Mechanisms for the Conservation of Crop Wild Relatives : A Malawi Case Study. 1–13.

Drucker, A. G., & Ramirez, M. (2020). Payments for agrobiodiversity conservation services: An overview of Latin American experiences, lessons learned and upscaling challenges. Land Use Policy, 99, 104810. https://doi.org///doi.org/10.1016/j.landusepol.2020.104810

Dulloo, M. . (2021). Plant genetic resources: A review of current research and future needs. In Plant genetic resources (1st ed.). Burleigh Dodds Science Publishing. https://doi.org/10.1201/9781003180623

Ebert, A. W. (2020). The role of vegetable genetic resources in nutrition security and vegetable breeding. Plants, 9(6), 736. https://doi.org/10.3390/plants9060736

Ebert, A. W., Engels, J. M. M., Schafleitner, R., Hintum, T. Van, & Mwila, G. (2023). Critical Review of the Increasing Complexity of Access and Benefit-Sharing Policies of Genetic Resources for Genebank Curators and Plant Breeders – A Public and Private Sector Perspective. 1–21.

Egli, L., Meyer, C., Scherber, C., Kreft, H., & Tscharntke, T. (2018). Winners and losers of national and global efforts to reconcile agricultural intensification and biodiversity conservation. Global Change Biology, 24(5), 2212–2228. https://doi.org/10.1111/gcb.14076

Engels, J. M. M., & Ebert, A. W. (2021a). A Critical Review of the Current Global Ex Situ Conservation System for Plant Agrobiodiversity. I. History of the Development of the Global System in the Context of the Political/Legal Framework and Its Major Conservation Components. Plants, 10(8), 1557. https://doi.org/10.3390/plants10091904

Engels, J. M. M., & Ebert, A. W. (2021b). A Critical Review of the Current Global Ex Situ Conservation System for Plant Agrobiodiversity. II. Strengths and Weaknesses of the Current System and Recommendations for Its Improvement. Plants, 10(9), 1904. https://doi.org/10.3390/plants10091904

Fadda, C., Mengistu, D. K., Kidane, Y. G., Dell’Acqua, M., Pè, M. E., & Van Etten, J. (2020). Integrating conventional and participatory crop improvement for smallholder agriculture using the Seeds for Needs Approach: a review. Frontiers in Plant Science, 11. https://doi.org/10.3389/fpls.2020.559515

FAO. (2019). Voluntary Guidelines for the Conservation and Sustainable Use of Farmers’. http://www.fao.org/3/ca5601en/CA5601EN.pdf

Farooq, M., & Pisante, M. (2019). Innovations in sustainable agriculture. Springer. https://doi.org/10.1007/978-3-030-23169-9_1

Feng, D., Liang, L., Wu, W., Li, C., Wang, L., Li, L., & Zhao, G. (2018). Factors influencing willingness to accept in the paddy land-to-dry land program based on contingent value method. Journal of Cleaner Production, 183, 392–402. https://doi.org/10.1016/j.jclepro.2018.02.142

Gajanana, T. M., Dinesh, M. R., Rajan, S., Vasudeva, R., Kumar, S. S., Lamers, H. A. H., Parthasarathy, V. A., Sthapit, B. R., & Ramanatha, R. V. (2015). Motivation for on-farm conservation of mango (Mangifera indica) diversity in India–A case study. Indian Journal of Plant Genetic Resources. https://doi.org/10.5958/0976-1926.2015.00001.7

Geussens, K., Van den Broeck, G., Vanderhaegen, K., Verbist, B., & Maertens, M. (2019). Farmers’ perspectives on payments for ecosystem services in Uganda. Land Use Policy, 84, 316–327. https://doi.org/10.1016/j.landusepol.2019.03.020

Giannoccaro, G., de Gennaro, B. C., De Meo, E., & Prosperi, M. (2017). Assessing farmers’ willingness to supply biomass as energy feedstock: cereal straw in Apulia (Italy). Energy Economics, 61, 179–185. https://doi.org/10.1016/j.eneco.2016.11.009

Gotor, E., Bellon, A., Polar, V., & Caracciolo, F. (2017). Assessing the benefits of Andean crop diversity on farmers’ livelihood: Insights from a development programme in Bolivia and Peru. Journal of International Development, 29(7), 877–898. https://doi.org///doi.org/10.1002/jid.3270

Graddy, T. G. (2014). Situating in situ: a critical geography of agricultural biodiversity conservation in the Peruvian Andes and beyond. Antipode, 46(2), 426–454. https://doi.org///doi.org/10.1111/anti.12045

Guzzon, F., Arandia Rios, L. W., Caviedes Cepeda, G. M., Céspedes Polo, M., Chavez Cabrera, A., Muriel Figueroa, J., Medina Hoyos, A. E., Jara Calvo, T. W., Molnar, T. L., & Narro León, L. A. (2021). Conservation and use of Latin American maize diversity: Pillar of nutrition security and cultural heritage of humanity. Agronomy, 11(1), 172. https://doi.org/10.3390/agronomy11010172

Haile, K. K., Tirivayi, N., & Tesfaye, W. (2019). Farmers’ willingness to accept payments for ecosystem services on agricultural land: The case of climate-smart agroforestry in Ethiopia. Ecosystem Services, 39, 100964. https://doi.org/10.1016/j.ecoser.2019.100964

Hanley, N., & Perrings, C. (2019). The economic value of biodiversity. Annual Review of Resource Economics, 11, 355–375. https://doi.org///doi.org/10.1146/annurev-resource-100518-093946

Hasler, B., Czajkowski, M., Elofsson, K., Hansen, L. B., Konrad, M. T., Nielsen, H. Ø., Niskanen, O., Nommann, T., Pedersen, A. B., & Peterson, K. (2019). Farmers’ preferences for nutrient and climate-related agri-environmental schemes: A cross-country comparison. Ambio, 48(11), 1290–1303. https://doi.org/10.1007/s13280-019-01242-6

He, K., Zhang, J., Zeng, Y., & Zhang, L. (2016). Households’ willingness to accept compensation for agricultural waste recycling: taking biogas production from livestock manure waste in Hubei, PR China as an example. Journal of Cleaner Production, 131, 410–420. https://doi.org/10.1016/j.jclepro.2016.05.009

Huang, X., Cheng, L., Chien, H., Jiang, H., Yang, X., & Yin, C. (2019). Sustainability of returning wheat straw to field in Hebei, Shandong and Jiangsu Provinces: A contingent valuation method. Journal of Cleaner Production, 213, 1290–1298. https://doi.org/10.1016/j.jclepro.2018.12.242

Isbell, C., Tobin, D., & Reynolds, T. (2021). Motivations for maintaining crop diversity: Evidence from Vermont’s seed systems. Ecological Economics, 189, 107138. https://doi.org/10.1016/j.ecolecon.2021.107138

Jarvis, D. I., Brown, A. H. D., Cuong, P. H., Collado-Panduro, L., Latournerie-Moreno, L., Gyawali, S., Tanto, T., Sawadogo, M., Mar, I., & Sadiki, M. (2008). A global perspective of the richness and evenness of traditional crop-variety diversity maintained by farming communities. Proceedings of the National Academy of Sciences, 105(14), 5326–5331. https://doi.org///doi.org/10.1073/pnas.0800607105

Jarvis, D. I., Hodgkin, T., Sthapit, B. R., Fadda, C., & Lopez-Noriega, I. (2011). An heuristic framework for identifying multiple ways of supporting the conservation and use of traditional crop varieties within the agricultural production system. Critical Reviews in Plant Sciences, 30(1–2), 125–176. https://doi.org///doi.org/10.1080/07352689.2011.554358

Jarvis, D., Myer, L., Klemick, H., Guarino, L., Smale, M., Brown, A. H. D., Sadiki, M., Sthapit, B., & Hodgkin, T. (2006). Guía de capacitación para la conservación in situ en fincas. In IPGRI, Roma, Italia.

Jiang, W., Yan, T., & Chen, B. (2021). Impact of media channels and social interactions on the adoption of straw return by Chinese farmers. Science of The Total Environment, 756, 144078. https://doi.org/10.1016/j.scitotenv.2020.144078

Joshi, B. K., Ghimire, K. H., Gurung, R., Pudasaini, N., Pant, S., Paneru, P., Gauchan, D., Mishra, K. K., & Jarvis, D. (2020a). On-farm agrobiodiversity measurement and conservation. NAGRC; LI-BIRD; Alliance of Bioversity International and CIAT. //hdl.handle.net/10568/109626

Joshi, B. K., Gorkhali, N. A., Pradhan, N., Ghimire, K. H., Gotame, T. P., Prenil, K. C., Mainali, R. P., Karkee, A., & Paneru, R. B. (2020b). Agrobiodiversity and its Conservation in Nepal. Journal of Nepal Agricultural Research Council, 6, 14–33. https://doi.org///doi.org/10.3126/jnarc.v6i0.28111

Juvančič, L., Slabe-Erker, R., Ogorevc, M., Drucker, A. G., Erjavec, E., & Bojkovski, D. (2021). Payments for Conservation of Animal Genetic Resources in Agriculture: One Size Fits All? Animals, 11(3), 846. https://doi.org/10.3390/ani11030846

Kanchanaroek, Y., & Aslam, U. (2018). Policy schemes for the transition to sustainable agriculture—Farmer preferences and spatial heterogeneity in northern Thailand. Land Use Policy, 78, 227–235. https://doi.org/10.1016/j.landusepol.2018.05.026

Khoury, C. K., Castañeda-Alvarez, N. P., Achicanoy, H. A., Sosa, C. C., Bernau, V., Kassa, M. T., Norton, S. L., van der Maesen, L. J. G., Upadhyaya, H. D., & Ramírez-Villegas, J. (2015). Crop wild relatives of pigeonpea [Cajanus cajan (L.) Millsp.]: Distributions, ex situ conservation status, and potential genetic resources for abiotic stress tolerance. Biological Conservation, 184, 259–270. https://doi.org/10.1016/j.biocon.2015.01.032

Kissell, R. L. (2021). Chapter 3 - Transaction Costs (R. L. B. T.-A. T. M. (Second E. Kissell (ed.); 2nd ed., pp. 57–97). Academic Press. https://doi.org/https://doi.org/10.1016/B978-0-12-815630-8.00003-X

Kochupillai, M., Gallersdörfer, U., Köninger, J., & Beck, R. (2021). Incentivizing research & innovation with agrobiodiversity conserved in situ: Possibilities and limitations of a blockchain-based solution. Journal of Cleaner Production, 309, 127155. https://doi.org/10.1016/j.jclepro.2021.127155

Krishna, V. V, Drucker, A. G., Pascual, U., Raghu, P. T., & King, E. D. I. O. (2013). Estimating compensation payments for on-farm conservation of agricultural biodiversity in developing countries. Ecological Economics, 87, 110–123. https://doi.org///doi.org/10.1016/j.ecolecon.2012.12.013

Kumar, N. A., Nambi, V. A., Rani, M. G., King, E. D. I. O., Chaudhury, S. S., & Mishra, S. (2015). Community agro biodiversity conservation continuum: an integrated approach to achieve food and nutrition security. Current Science, 474–487. https://www.jstor.org/stable/24906102?seq=1

Larochelle, C., Alwang, J., Travis, E., Barrera, V. H., & Dominguez Andrade, J. M. (2019). Did you really get the message? Using text reminders to stimulate adoption of agricultural technologies. The Journal of Development Studies, 55(4), 548–564.

Latacz-Lohmann, U., & Breustedt, G. (2019). Using choice experiments to improve the design of agri-environmental schemes. European Review of Agricultural Economics, 46(3), 495–528. https://doi.org/10.1093/erae/jbz020

Leroy, G., Carroll, E. L., Bruford, M. W., DeWoody, J. A., Strand, A., Waits, L., & Wang, J. (2018). Next‐generation metrics for monitoring genetic erosion within populations of conservation concern. Evolutionary Applications, 11(7), 1066–1083. https://doi.org/10.1111/eva.12564

Li, F., Ren, J., Wimmer, S., Yin, C., Li, Z., & Xu, C. (2020). Incentive mechanism for promoting farmers to plant green manure in China. Journal of Cleaner Production, 267, 122197. https://doi.org/10.1016/j.jclepro.2020.122197

Li, G., Shi, M., & Zhou, D. (2021). How much will farmers be compensated for water reallocation from agricultural water to the local ecological sector on the edge of an oasis in the Heihe River Basin? Agricultural Water Management, 249, 106801. https://doi.org/10.1016/j.agwat.2021.106801

Li, H., Yang, X., Zhang, X., Liu, Y., & Zhang, K. (2018). Estimation of rural households’ willingness to accept two PES programs and their service valuation in the Miyun reservoir catchment, China. Sustainability, 10(1), 170. https://doi.org/0.3390/su10010170

Louafi, S., Thomas, M., Berthet, E. T., Pélissier, F., Vaing, K., Jankowski, F., Bazile, D., Pham, J.-L., & Leclercq, M. (2021). Crop Diversity Management System Commons: Revisiting the Role of Genebanks in the Network of Crop Diversity Actors. Agronomy, 11(9), 1893. https://doi.org/10.3390/agronomy11091893

Lozano-Povis, A., Alvarez-Montalván, C. E., & Moggiano, N. (2021). El cambio climático en los andes y su impacto en la agricultura: una revisión sistemática. Scientia Agropecuaria, 12(1), 101–108. https://doi.org/10.17268/sci.agropecu.2021.012

Madden, C. (2019). Criar y Dejarse Criar: Trans-Situ Crop Conservation and Indigenous Landscape Management through a Network of Global Food Neighborhoods. //digitalcollections.sit.edu/capstones/3195

Maxted, N, Ford-Lloyd, B. V, & Hawkes, J. G. (2000). Complementary conservation strategies. In Plant genetic conservation (pp. 15–39). Springer. https://doi.org/10.1007/978-94-009-1437-7_2

Maxted, N., & Brehm, J. M. (2022). Maximizing the crop wild relative resources available to plant breeders for crop improvement.

Maxted, N., Dulloo, M. E., & Ford-Lloyd, B. V. (2016). Enhancing crop genepool use: capturing wild relative and landrace diversity for crop improvement. CABI.

McGurk, E., Hynes, S., & Thorne, F. (2020). Participation in agri-environmental schemes: A contingent valuation study of farmers in Ireland. Journal of Environmental Management, 262, 110243. https://doi.org/10.1016/j.jenvman.2020.110243

Methley, A. M., Campbell, S., Chew-Graham, C., McNally, R., & Cheraghi-Sohi, S. (2014). PICO, PICOS and SPIDER: a comparison study of specificity and sensitivity in three search tools for qualitative systematic reviews. BMC Health Services Research, 14(1), 1–10. https://doi.org/10.1186/s12913-014-0579-0

Midler, E., Pascual, U., Drucker, A. G., Narloch, U., & Soto, J. L. (2015). Unraveling the effects of payments for ecosystem services on motivations for collective action. Ecological Economics, 120, 394–405. https://doi.org/10.1016/j.ecolecon.2015.04.006

Moukam, C. Y. (2021). Supplying Environmental Services through Sustainable Agriculture in Rural Cameroon: An Estimation of Farmers’ Willingness to Accept in Barombi Mbo. International Journal of Innovation and Applied Studies, 33(1), 222–233. //www.ijias.issr-journals.org/abstract.php?article=IJIAS-21-130-02

Naidoo, R., Balmford, A., Ferraro, P. J., Polasky, S., Ricketts, T. H., & Rouget, M. (2006). Integrating economic costs into conservation planning. Trends in Ecology & Evolution, 21(12), 681–687. https://doi.org/10.1016/j.tree.2006.10.003

Narloch, U., Drucker, A. G., & Pascual, U. (2011). Payments for agrobiodiversity conservation services for sustained on-farm utilization of plant and animal genetic resources. Ecological Economics, 70(11), 1837–1845. https://doi.org///doi.org/10.1016/j.ecolecon.2011.05.018

Narloch, U., Drucker, A. G., & Pascual, U. (2017). What role for cooperation in conservation tenders? Paying farmer groups in the High Andes. Land Use Policy, 63, 659–671. https://doi.org/10.1016/j.landusepol.2015.09.017

Narloch, U. L. F., Pascual, U., & Drucker, A. G. (2011). Cost-effectiveness targeting under multiple conservation goals and equity considerations in the Andes. Environmental Conservation, 417–425. https://doi.org///doi.org/10.1017/S0376892911000397

Narloch, U., Pascual, U., & Drucker, A. G. (2013). How to achieve fairness in payments for ecosystem services? Insights from agrobiodiversity conservation auctions. Land Use Policy, 35, 107–118. https://doi.org///doi.org/10.1016/j.landusepol.2013.05.002

Negri, V., Maxted, N., & Veteläinen, M. (2009). European landrace conservation: an introduction. In European Landraces: On-farm Conservation, Management and Use. Rome IT: Bioversity International (pp. 1–22).

Niskanen, O., Tienhaara, A., Haltia, E., & Pouta, E. (2021). Farmers’ heterogeneous preferences towards results-based environmental policies. Land Use Policy, 102, 105227. https://doi.org/10.1016/j.landusepol.2020.105227

Nogué, F., Mara, K., Collonnier, C., & Casacuberta, J. M. (2016). Genome engineering and plant breeding: impact on trait discovery and development. Plant Cell Reports, 35(7), 1475–1486. https://doi.org/10.1007/s00299-016-1993-z

Nong, Y., Yin, C., Yi, X., Ren, J., & Chien, H. (2021). Smallholder farmer preferences for diversifying farming with cover crops of sustainable farm management: A discrete choice experiment in Northwest China. Ecological Economics, 186, 107060. https://doi.org/10.1016/j.ecolecon.2021.107060

Nordhagen, S., Pascual, U., & Drucker, A. G. (2017). Feeding the household, growing the business, or just showing off? Farmers’ motivations for crop diversity choices in Papua New Guinea. Ecological Economics, 137, 99–109. https://doi.org/10.1016/j.ecolecon.2017.02.025

Nyongesa, J. M., Bett, H. K., Lagat, J. K., & Ayuya, O. I. (2016). Estimating farmers’ stated willingness to accept pay for ecosystem services: Case of Lake Naivasha watershed Payment for Ecosystem Services scheme-Kenya. Ecological Processes, 5(1), 1–15. https://doi.org/10.1186/s13717-016-0059-z

Pachauri, R. K., Allen, M. R., Barros, V. R., Broome, J., Cramer, W., Christ, R., Church, J. A., Clarke, L., Dahe, Q., & Dasgupta, P. (2014). Climate change 2014: synthesis report. Contribution of Working Groups I, II and III to the fifth assessment report of the Intergovernmental Panel on Climate Change. Ipcc. https://epic.awi.de/id/eprint/37530/

Padulosi, S., & Drucker, A. (2018). Injecting Diversity to Bolster Immunity to Climate Change and Food Insecurity. Bioversity International. https://www.bioversityinternational.org/news/detail/inyectando-diversidad-para-reforzar-la-inmunidad-al-cambio-climatico-y-a-la-inseguridad-alimentar/

Pallante, G., Drucker, A. G., & Sthapit, S. (2016). Assessing the potential for niche market development to contribute to farmers’ livelihoods and agrobiodiversity conservation: Insights from the finger millet case study in Nepal. Ecological Economics, 130, 92–105. https://doi.org///doi.org/10.1016/j.ecolecon.2016.06.017

Pascual, U., & Perrings, C. (2007). Developing incentives and economic mechanisms for in situ biodiversity conservation in agricultural landscapes. Agriculture, Ecosystems & Environment, 121(3), 256–268. https://doi.org/10.1016/j.agee.2006.12.025

Perrino, E. V, & Perrino, P. (2020). Crop wild relatives: Know how past and present to improve future research, conservation and utilization strategies, especially in Italy: A review. Genetic Resources and Crop Evolution, 67(5), 1067–1105. https://doi.org/10.1007/s10722-020-00930-7

Pilling, D., Bélanger, J., Diulgheroff, S., Koskela, J., Leroy, G., Mair, G., & Hoffmann, I. (2020). Global status of genetic resources for food and agriculture: challenges and research needs. Genetic Resources, 1(1), 4–16.

Prasada, I. Y., & Masyhuri, M. (2019). Farmers’ Willingness to Accept a Compensation to Protect Agricultural Land Sustainability in Peri-Urban Areas of Pekalongan City. Agro Ekonomi, 30(2). https://doi.org/10.22146/ae.48869

Rajpurohit, D., & Jhang, T. (2015). In situ and ex situ conservation of plant genetic resources and traditional knowledge. In Plant Genetic Resources and Traditional Knowledge for Food Security (pp. 137–162). Springer. https://doi.org/10.1007/978-981-10-0060-7_8

Ramankutty, N., Mehrabi, Z., Waha, K., Jarvis, L., Kremen, C., Herrero, M., & Rieseberg, L. H. (2018). Trends in global agricultural land use: implications for environmental health and food security. Annual Review of Plant Biology, 69, 789–815. https://doi.org/10.1146/annurev-arplant-042817-040256

Ramirez‐Villegas, J., Khoury, C. K., Achicanoy, H. A., Mendez, A. C., Diaz, M. V., Sosa, C. C., Debouck, D. G., Kehel, Z., & Guarino, L. (2020). A gap analysis modelling framework to prioritize collecting for ex situ conservation of crop landraces. Diversity and Distributions, 26(6), 730–742. https://doi.org/10.1111/ddi.13046

Rasheed, S., Venkatesh, P., Singh, D. R., Renjini, V. R., Jha, G. K., & Sharma, D. K. (2021). Ecosystem valuation and eco-compensation for conservation of traditional paddy ecosystems and varieties in Kerala, India. Ecosystem Services, 49, 101272. https://doi.org/10.1016/j.ecoser.2021.101272

Rojas, W., Flores, J., & Pinto, M. (2014). Conservación in situ de la agrobiodiversidad: la experiencia de PROINPA en comunidades circunlacustres al Lago Titicaca. Fundación PROINPA, 48–54. https://doi.org/http://www.nuscommunity.org/fileadmin/templates/nuscommunity.org/upload/documents/Publications/2011-2014/2014_Rojas_Titicaca.pdf

Rometsch, S., Petitpierre, B., Boserup, J., Adrian, M., & Aubry, S. (2023). Importance of agriculture for crop wild relatives conservation in Switzerland. 46.

Saddoud Debbabi, O., Rahmani Mnasri, S., Ben Amar, F., Naceur, B., Montemurro, C., & Miazzi, M. M. (2021). Applications of Microsatellite Markers for the Characterization of Olive Genetic Resources of Tunisia. Genes, 12(2), 286. https://doi.org/10.3390/genes12020286

Salzman, J., Bennett, G., Carroll, N., Goldstein, A., & Jenkins, M. (2018). The global status and trends of Payments for Ecosystem Services. Nature Sustainability, 1(3), 136–144. https://doi.org/10.1038/s41893-018-0033-0

Sardaro, R., Faccilongo, N., Contò, F., & La Sala, P. (2021). Adaption Actions to Cope with Climate Change: Evidence from Farmers’ Preferences on an Agrobiodiversity Conservation Programme in the Mediterranean Area. Sustainability, 13(11), 5977. https://doi.org/10.3390/su13115977

Sardaro, R., Girone, S., Acciani, C., Bozzo, F., Petrontino, A., & Fucilli, V. (2016). Agro-biodiversity of Mediterranean crops: farmers’ preferences in support of a conservation programme for olive landraces. Biological Conservation, 201, 210–219. https://doi.org/10.1016/j.biocon.2016.06.033

Singh, S. K., Nath, V., Rajan, S., & Pandey, S. D. (2019). Surveying Mango Diversity and its Custodian Farmers in the States of Bihar and Jharkhand, India. Indian Journal of Plant Genetic Resources, 32(2), 200–206. https://doi.org/10.5958/0976-1926.2019.00025.1

Smale, M., Bellon, M. R., Jarvis, D., & Sthapit, B. (2004). Economic concepts for designing policies to conserve crop genetic resources on farms. Genetic Resources and Crop Evolution, 51(2), 121–135. https://doi.org/10.1023/B:GRES.0000020678.82581.76

Sonnino, A. (2017). International instruments for conservation and sustainable use of plant genetic resources for food and agriculture: an historical appraisal. Diversity, 9(4), 50. https://doi.org/10.3390/d9040050

Struik, P. C., & Kuyper, T. W. (2017). Sustainable intensification in agriculture: the richer shade of green. A review. Agronomy for Sustainable Development, 37(5), 1–15. https://doi.org/10.1007/s13593-017-0445-7

Sumalan, R.-L., Ciulca, S.-I., Sumalan, R.-M., & Popescu, S. (2021). Landraces of Vegetables: The “Gene Banks” for Traditional Farmers and Future Breeding Programs. https://doi.org/10.5772/intechopen.96138

Sun, X., Liu, X., Zhao, S., & Zhu, Y. (2021). An evolutionary systematic framework to quantify short-term and long-term watershed ecological compensation standard and amount for promoting sustainability of livestock industry based on cost-benefit analysis, linear programming, WTA and WTP method. Environmental Science and Pollution Research, 28(14), 18004–18020. https://doi.org/10.1007/s11356-020-11769-x

Swaminathan, M. S. (2022). The Past, Present and Future Contributions of Farmers to the Conservation and Development of Genetic Diversity. In Managing Plant Genetic Diversity; Engels, J. M. M., Rao, V. R., Brown, A., Jackson, M. T., Eds.; CABI Publishing: New York, NY, USA, pp. 23–32.

Tao, J., & Wang, J. (2020). Farmers’ willingness to accept compensation for livestock and poultry waste resource utilization and its determinants. Chinese Journal of Population, Resources and Environment, 18(2), 144–154. https://doi.org/10.1016/j.cjpre.2021.04.019

Tiemann, L. K., Grandy, A. S., Atkinson, E. E., Marin‐Spiotta, E., & McDaniel, M. D. (2015). Crop rotational diversity enhances belowground communities and functions in an agroecosystem. Ecology Letters, 18(8), 761–771. https://doi.org/10.1111/ele.12453

Tyack, N., Dempewolf, H., & Khoury, C. K. (2020). The potential of payment for ecosystem services for crop wild relative conservation. Plants, 9(10), 1305. https://doi.org/10.3390/plants9101305

Tyllianakis, E., & Martin-Ortega, J. (2021). Agri-environmental schemes for biodiversity and environmental protection: How were are not yet “hitting the right keys.” Land Use Policy, 109, 105620. https://doi.org/10.1016/j.landusepol.2021.105620

Villamayor-Tomas, S., Sagebiel, J., Rommel, J., & Olschewski, R. (2021). Types of collective action problems and farmers’ willingness to accept agri-environmental schemes in Switzerland. Ecosystem Services, 50, 101304. https://doi.org/10.1016/j.ecoser.2021.101304

Villamayor-Tomas, S., Thiel, A., Amblard, L., Zikos, D., & Blanco, E. (2019). Diagnosing the role of the state for local collective action: Types of action situations and policy instruments. Environmental Science & Policy, 97, 44–57. https://doi.org/10.1016/j.envsci.2019.03.009

Villanueva, A. J., Gómez-Limón, J. A., Arriaza, M., & Rodríguez-Entrena, M. (2015). The design of agri-environmental schemes: Farmers’ preferences in southern Spain. Land Use Policy, 46, 142–154. https://doi.org/10.1016/j.landusepol.2015.02.009

Visioni, A., Basile, B., Amri, A., & Sanchez-garcia, M. (2023). Advancing the Conservation and Utilization of Barley Genetic Resources : Insights into Germplasm Management and Breeding for Sustainable Agriculture.

Wainwright, W., Maxted, A. D., G., Brehm, B. N., Ng’uni, J. M., & Moran, D. (2019a). Estimating in situ conservation costs of Zambian crop wild relatives under alternative conservation goals. Land Use Policy, 81, 632–643. https://doi.org///doi.org/10.1016/j.landusepol.2018.11.033

Wainwright, W., Vosough Ahmadi, B., Mcvittie, A., Simm, G., & Moran, D. (2019). Prioritising support for cost effective rare breed conservation using multi-criteria decision analysis. Frontiers in Ecology and Evolution, 7, 110. https://doi.org/10.3389/fevo.2019.00110

Wang, Y., He, K., Zhang, J., & Chang, H. (2020). Environmental knowledge, risk attitude, and households’ willingness to accept compensation for the application of degradable agricultural mulch film: Evidence from rural China. Science of The Total Environment, 744, 140616. https://doi.org/10.1016/j.scitotenv.2020.140616

Wooldridge, J. M. (2015). Introductory econometrics: A modern approach (6th ed.). Cengage learning. 912 p.

Wuepper, D., Heissenhuber, A., & Sauer, J. (2017). Investigating rice farmers’ preferences for an agri-environmental scheme: Is an eco-label a substitute for payments? Land Use Policy, 64, 374–382. https://doi.org/10.1016/j.landusepol.2017.03.014

Yamota, J. R. G., & Tan-Cruz, A. (2007). 10 th National Convention on Statistics (NCS). https://doi.org/10.1.1.585.4278&rep=rep1&type

Yang, T., Siddique, K. H. M., & Liu, K. (2020). Cropping systems in agriculture and their impact on soil health-A review. Global Ecology and Conservation, e01118. https://doi.org/10.1016/j.gecco.2020.e01118

Yang, X., Cheng, L., Huang, X., Zhang, Y., Yin, C., & Lebailly, P. (2020). Incentive mechanism to promote corn stalk return sustainably in Henan, China. Science of The Total Environment, 738, 139775. https://doi.org/10.1016/j.scitotenv.2020.139775

Zair, W., Maxted, N., Brehm, J. M., & Amri, A. (2021). Ex situ and in situ conservation gap analysis of crop wild relative diversity in the Fertile Crescent of the Middle East. Genetic Resources and Crop Evolution, 68(2), 693–709. https://doi.org/10.1007/s10722-017-0576-3

Zeven, A. C. (1998). Landraces: a review of definitions and classifications. Euphytica, 104(2), 127–139. https://doi.org/10.1023/A:1018683119237

Zimmerer, K. S. (2015). Understanding agrobiodiversity and the rise of resilience: analytic category, conceptual boundary object or meta-level transition? Resilience, 3(3), 183–198. https://doi.org/10.1080/21693293.2015.1072311

Zimmerer, K. S., & De Haan, S. (2017). Agrobiodiversity and a sustainable food future. Nature Plants, 3(4), 1–3. https://doi.org///doi.org/10.1038/nplants.2017.47

Zimmerer, K. S., de Haan, S., Jones, A. D., Creed-Kanashiro, H., Tello, M., Carrasco, M., Meza, K., Amaya, F. P., Cruz-Garcia, G. S., & Tubbeh, R. (2019). The biodiversity of food and agriculture (Agrobiodiversity) in the anthropocene: Research advances and conceptual framework. Anthropocene, 25, 100192. https://doi.org/10.1016/j.ancene.2019.100192

Zuo, A., Hou, L., & Huang, Z. (2020). How does farmers’ current usage of crop straws influence the willingness-to-accept price to sell? Energy Economics, 86, 104639. https://doi.org/10.1016/j.eneco.2019.104639

ANNEX

Appendix A: Full list of reviewed studies