Agrobiodiversity: The Bedrock of Climate-Resilient Food Systems

Sushanta Paudel / In an era of climate change and environmental uncertainty, the future of our food security depends on a resource we are rapidly depleting: agrobiodiversity. This critical subset of biodiversity encompasses not only the domesticated plants and animals we consume but the vast array of species that support production ecosystems from soil microbes and pollinators to the natural enemies of crop pests. As the climate crisis intensifies, revitalizing agrobiodiversity is emerging as a powerful, nature-based solution to build resilience, enhance nutrition, and sustain livelihoods for a growing global population.

What is Agrobiodiversity? Beyond the Monoculture

The environment, genetic resources, and the management systems and practices of culturally varied peoples have interacted for millennia to produce agrobiodiversity. It is an essential part of biodiversity in general, with a focus on food and agriculture.

The concept is multifaceted, encompassing several key components:

Genetic Resources for Food and Agriculture: This includes the variety of crops, livestock breeds, fish species, and microbial organisms used directly for consumption or production. Diversity within a single species such as thousands of traditional rice varieties with differing traits is at least as important as diversity between species.
Associated Biodiversity: These are the non-harvested species that support ecosystem functions, including soil microorganisms, pollinators like bees and butterflies, and predators that control pest populations . These organisms are the unsung heroes of productive farming systems.
Agro-ecosystem Diversity: This refers to the variety of agricultural ecosystems themselves the complex of fields, pastures, ponds, hedgerows, and forests that form a working landscape.

Table: The Multiple Components of Agrobiodiversity

The Climate Resilience Imperative: Why Agrobiodiversity Matters Now

The value of agrobiodiversity extends far beyond the preservation of traditional foods. It is a fundamental asset for adapting to a changing planet.

1. Genetic Adaptation to Climate Change
The basis for adaptability comes from the genetic diversity found in agricultural species. New patterns of drought, flooding, unseasonal frosts, and heatwaves brought about by climate change provide a wider genetic pool from which characteristics for resistance and tolerance might be derived. To ensure sustained productivity, farmers and plant breeders can choose and create cultivars that are more resilient to these challenges.

2. Natural Risk Mitigation and Buffer against failure
Monoculture systems, where vast areas are planted with a single genetic variety, are highly vulnerable to complete failure from a new pest, disease, or weather event. In contrast, diverse farming systems spread this risk. If one crop variety fails due to drought, another with better drought tolerance may still produce a harvest. This stability is crucial for the food and livelihood security of millions of smallholder farmers who are on the front lines of climate impacts.

3. Foundation for Regenerative Ecosystem Services
Agrobiodiversity underpins the health of the entire agro-ecosystem, which in turn determines its resilience:
• Soil Health: Diverse plant cover and soil microorganisms help conserve soil, increase natural fertility, and prevent erosion, a critical function as the world faces topsoil degradation.
• Pest and Disease Control: A diverse landscape provides habitat for natural predators of crop pests, reducing dependence on chemical pesticides and enabling organic pest control.
• Pollination: Over 75% of major global crop species rely on animal pollinators. Agrobiodiversity supports healthy pollinator populations by providing continuous habitat and food sources.
• Water Conservation: Biodiverse systems often improve water infiltration and retention, helping to conserve water and regulate flooding in the face of erratic rainfall.

A Precipitous Decline: The State of Agrobiodiversity

Despite its critical importance, agrobiodiversity is declining at an alarming rate. The Food and Agriculture Organization (FAO) has highlighted several disturbing trends :
• Since the 1900s, approximately 75% of plant genetic diversity has been lost as farmers worldwide have abandoned local varieties for genetically uniform, high-yielding types.
• 30% of livestock breeds are at risk of extinction, with an estimated six breeds lost every month.
• Today, a startling 75% of the world’s food is generated from just 12 plant and five animal species.
• Just three crops rice, maize, and wheat contribute nearly 60% of the calories and proteins obtained by humans from plants.

This dramatic genetic erosion is driven by multiple factors, including the expansion of industrial agriculture and monocultures, the globalization of the food system, and the marginalization of small-scale, diverse production systems. The loss is compounded by the concurrent erosion of traditional knowledge held by farmers, herders, and indigenous communities, who have been the primary developers and custodians of this diversity for generations.

Cultivating Resilience: Pathways to Agrobiodiversity Conservation

Reversing the decline of agrobiodiversity requires a multi-faceted approach that integrates conservation with sustainable use. Strategies operate at three main levels:

1. On-Farm Conservation: Empowering Communities
This approach focuses on conserving diversity in its natural habitat and within dynamic farming systems. It is considered one of the most sustainable methods because it allows species to continue evolving in response to changing conditions. Key practices include:
• Community Seed Banks: Empowering farmers to save, exchange, and reproduce local seeds, thereby strengthening local seed networks and preserving genetic diversity.
• Participatory Plant Breeding: Involving farmers in research programs to identify and develop varieties with preferred traits, such as climate resilience or nutritional value.
• Custodian Farmer Recognition: Identifying and supporting farmers who play a key role in maintaining traditional varieties and knowledge.

2. Education and Awareness: Bridging Knowledge Gaps
Agricultural extension services and educational institutions play a crucial role in mainstreaming agrobiodiversity. Effective methods include organizing seed and food festivals to celebrate local diversity, establishing school nutrition gardens, and creating educational materials in local languages to highlight the value of traditional crops.

3. Supportive Policies and Incentives
Governments and institutions can foster agrobiodiversity conservation through supportive policies and economic incentives. This includes implementing Payment for Agrobiodiversity Conservation Services (PACS) schemes, which reward farmers for maintaining diverse genetic resources, and advocating for national policies that prioritize agrobiodiversity as a public good. Ensuring equitable benefit-sharing from the use of genetic resources is also critical to incentivizing conservation by local communities.

Conclusion

Agrobiodiversity is not a relic of the past but a living, evolving resource that is fundamental to our collective future. In the face of climate change, it offers a pathway to more resilient, productive, and sustainable food systems. The choices we make today in our farms, our markets, and our policies will determine whether we continue to lose this precious genetic heritage or harness its potential. By supporting the farmers who are its stewards, investing in conservation, and embracing diversity on our plates and in our fields, we can cultivate a future that is not only more food-secure but also richer, more resilient, and more nourishing for all.