Biodiversity and Ecosystem Health

Biodiversity & Ecosystem Health is a foundational pillar of the Wildlife & Conservation Health knowledge system because healthy ecosystems depend on the diversity of life they support. Biodiversity encompasses the variety of genes, species, functional traits, and ecosystems that interact to sustain ecological processes. Ecosystem health refers to the capacity of natural systems to maintain these processes over time while supporting wildlife, environmental stability, and the ecosystem services that benefit both animals and people. Together, these concepts provide an essential framework for understanding conservation biology, wildlife health, and long-term environmental sustainability.

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Research over the past several decades has consistently shown that biodiversity contributes positively to many aspects of ecosystem functioning. Diverse biological communities often produce more biomass, cycle nutrients more efficiently, support pollination, and provide a broader range of ecosystem services than simplified communities. However, the relationship between biodiversity and ecosystem health is complex, not universal. The influence of biodiversity varies depending on the ecological function being measured, environmental conditions, spatial scale, and the types of species present. Modern ecological research increasingly emphasizes that functional diversity, ecological interactions, and response diversity often provide better insight into ecosystem performance than species richness alone (Tilman et al., 2014; Van Der Plas, 2019; Mori et al., 2013).

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As biodiversity declines worldwide, concerns extend beyond the loss of individual species. Reductions in biodiversity can alter ecosystem processes, weaken ecosystem services, and reduce the capacity of ecological communities to respond to environmental change. Conservation efforts therefore increasingly focus on maintaining ecological integrity, protecting habitats, and preserving the diversity that supports resilient ecosystems across landscapes (Isbell et al., 2017; Pereira et al., 2024).

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What This Major Pillar Covers

 

This Major Pillar introduces the scientific principles that connect biodiversity with ecosystem health and explores how biological diversity influences how natural environments function. Rather than focusing on individual species, it examines the broader ecological systems that support wildlife populations and sustain environmental processes.

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Topics covered throughout this pillar include:

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• The relationship between biodiversity and ecological health

• How biodiversity supports ecosystem function

• The importance of habitat conservation

• Ecological resilience and ecosystem stability

• Functional diversity and ecosystem services

• Environmental change and biodiversity loss

• Conservation biology and sustainable ecosystem management

• Current research directions in biodiversity science

 

These concepts establish a scientific foundation for understanding how ecosystems function under both natural and changing environmental conditions.

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Why This Area Matters

 

Biodiversity and ecosystem health underpin nearly every aspect of wildlife conservation and environmental sustainability. Healthy ecosystems regulate nutrient cycling, energy flow, water purification, carbon storage, pollination, soil formation, and countless ecological interactions that sustain life. When biodiversity is maintained, ecosystems generally become more productive, support a wider range of ecological functions, and provide numerous ecosystem services that benefit wildlife and human societies alike (Balvanera et al., 2006; Isbell et al., 2017).

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Research demonstrates particularly strong evidence that biodiversity enhances ecosystem functioning across terrestrial, freshwater, and marine environments. Experimental studies consistently show that communities containing greater species diversity often outperform monocultures in biomass production and overall ecosystem performance. Diverse communities also tend to maintain ecological processes more consistently over time because different species contribute complementary ecological roles under changing environmental conditions (Tilman et al., 2014; Mittelbach & McGill, 2019).

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At the same time, ecosystem health cannot be evaluated by counting species alone. Modern ecological research shows that functional diversity—the variety of ecological roles organisms perform—and response diversity—the range of ways species respond to environmental change—often explain ecosystem functioning more effectively than species richness alone. Different organisms may perform similar ecological functions while responding differently to drought, disease, climate variability, or habitat disturbance. This variation enables ecological processes to continue even when some species decline, illustrating why biodiversity encompasses much more than the total number of species present (Van Der Plas, 2019; Mori et al., 2013; Yan et al., 2023).

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The growing recognition of biodiversity's ecological importance has also strengthened interdisciplinary frameworks such as One Health, which recognizes that environmental health, animal health, and human health are closely interconnected. Healthy ecosystems contribute to clean water, stable food systems, disease regulation, climate resilience, and wildlife conservation, highlighting biodiversity as an essential component of long-term global sustainability (Isbell et al., 2017).

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How This Major Pillar Relates to Wildlife & Conservation Health Overview

 

This page is part of the broader Wildlife & Conservation Health Overview knowledge system.

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Within that system, Biodiversity & Ecosystem Health serves as one of the central educational pillars explaining how ecological processes influence wildlife populations and environmental health. Wildlife conservation extends beyond protecting individual animals; it requires maintaining the ecological communities, habitats, and ecosystem functions that sustain those populations over time.

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Understanding biodiversity therefore provides the ecological context needed to interpret many other conservation topics, including habitat degradation, ecosystem restoration, climate adaptation, species interactions, and landscape management. Because ecosystem processes operate across multiple biological scales—from genes and species to entire landscapes—this pillar provides an integrated perspective that connects ecological theory with practical conservation science.

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The three supporting Minor Pillars explore these relationships in greater depth by examining biodiversity itself, habitat conservation, and the ecological mechanisms that promote ecosystem resilience.

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Key Concepts Within This Pillar

 

Several interconnected scientific concepts form the foundation of biodiversity and ecosystem health.

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Biodiversity

 

Biodiversity refers to the variety of living organisms at multiple biological levels, including genetic diversity within species, species diversity within communities, functional diversity among ecological roles, and ecosystem diversity across landscapes. These multiple dimensions collectively shape ecosystem biodiversity and influence how ecosystems function under changing environmental conditions.

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Ecosystem Health

 

Ecosystem health describes the capacity of ecological systems to maintain their structure, functions, productivity, and ecological interactions over time. Healthy ecosystems support wildlife populations while sustaining ecological processes such as nutrient cycling, primary productivity, decomposition, pollination, and recovery from natural disturbances.

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Ecosystem Function

 

Ecosystem function encompasses the biological, chemical, and physical processes occurring within ecosystems. Examples include energy transfer through food webs, nutrient cycling, biomass production, soil formation, carbon storage, and water regulation. Biodiversity often enhances these processes through complementary interactions among species, although environmental conditions also influence outcomes (Tilman et al., 2014; Van Der Plas, 2019).

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Ecosystem Services

 

Ecosystem services are the benefits ecosystems provide to wildlife and society. These include regulating services such as climate regulation and water purification, supporting services including nutrient cycling and soil formation, provisioning services such as timber and fisheries, and cultural services associated with recreation and education. Biodiversity contributes to many of these services, although the strength of these relationships varies across ecosystems and spatial scales (Balvanera et al., 2006; Provost et al., 2022).

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Functional Diversity

 

Functional diversity reflects the diversity of ecological traits that species contribute within communities. Organisms occupying different ecological niches often use resources differently, perform complementary ecological roles, and collectively improve ecosystem multifunctionality. Functional diversity frequently predicts ecosystem performance more accurately than simple species counts (Yan et al., 2023; Van Der Plas, 2019).

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Ecological Resilience

 

Ecological resilience refers to an ecosystem's ability to absorb disturbance while maintaining essential functions. Research indicates that biodiversity often supports resilience through complementary species interactions and response diversity, although resilience depends on ecological context and cannot be explained by species richness alone. Some ecosystems show strong biodiversity-resilience relationships, while others show more complex responses shaped by disturbance type, trophic structure, and environmental conditions (Mori et al., 2013; Pennekamp et al., 2018; Su et al., 2024).

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The following sections explore the three major components of this pillar in greater depth:

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Biodiversity and Health

 

Biodiversity supports ecological health by influencing ecosystem productivity, ecological interactions, and ecosystem services. Learn more in our guide to Biodiversity and Health.

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Habitat Conservation

 

Habitat conservation protects the environmental conditions needed to maintain species diversity, ecosystem function, and long-term ecological integrity. Learn more in our guide to Habitat Conservation.

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Ecosystem Function and Resilience

 

Ecosystem resilience reflects the capacity of ecological communities to sustain essential functions despite disturbance and environmental change. Learn more in our guide to Ecosystem Function and Resilience.

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Biodiversity and Health

 

Biodiversity and health are closely connected through the ecological processes that sustain natural environments. Within conservation biology, biodiversity extends beyond simply counting the number of species present in an ecosystem. It encompasses genetic diversity within populations, species diversity within communities, functional diversity among organisms performing different ecological roles, and ecosystem diversity across landscapes. Together, these dimensions influence ecosystem health by supporting ecological functions, maintaining environmental stability, and providing ecosystem services that benefit wildlife and human populations alike.

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Research consistently demonstrates that biodiversity contributes positively to ecosystem functioning. Across terrestrial, freshwater, and marine ecosystems, communities with greater biological diversity generally exhibit higher productivity, improved nutrient cycling, greater biomass production, and enhanced resource-use efficiency than communities with fewer species. Large-scale experimental studies show that mixtures of multiple species often produce about twice the biomass of comparable monocultures because different organisms use resources in complementary ways rather than competing for identical ecological niches (Tilman et al., 2014; Mittelbach & McGill, 2019).

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This phenomenon reflects one of the central principles of ecosystem ecology: different species contribute unique ecological functions. Some organisms specialize in nutrient cycling, others support pollination, decomposition, seed dispersal, or predation, while many interact through complex food webs that collectively regulate ecosystem processes. Because no single species performs every ecological role, diverse biological communities often maintain ecological functions more effectively than simplified systems.

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Importantly, biodiversity does not affect every ecosystem in the same way. Research in naturally assembled ecological communities shows that biodiversity often promotes biomass production, pollination, and temporal ecosystem stability, but neutral or variable relationships are also common. Environmental conditions—including climate, soil characteristics, hydrology, and disturbance history—sometimes influence ecosystem performance more strongly than biodiversity alone. Consequently, biodiversity should be viewed as one of several interacting drivers of ecosystem health rather than the sole determinant of ecological outcomes (Van Der Plas, 2019).

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Modern ecological research also emphasizes that biodiversity encompasses far more than species richness. While species richness remains an important measure of ecosystem biodiversity, additional dimensions often better explain ecosystem functioning.

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Functional Diversity Supports Multiple Ecological Processes

 

Functional diversity describes the variety of ecological traits represented within a biological community. Species possessing different feeding strategies, growth forms, reproductive behaviors, physiological characteristics, or habitat requirements contribute distinct ecological functions that collectively support ecosystem multifunctionality.

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Evidence suggests that functional diversity frequently predicts ecosystem functioning more accurately than species richness alone. Ecosystems with species with complementary ecological roles often show improved nutrient retention, greater resource-use efficiency, and a stronger capacity to perform multiple ecological functions simultaneously. This concept of ecosystem multifunctionality recognizes that healthy ecosystems rarely perform only one function; instead, they regulate water, cycle nutrients, support wildlife habitat, produce biomass, and maintain food webs simultaneously (Van Der Plas, 2019; Yan et al., 2023).

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For example, plant communities with species that vary in root depth, nutrient acquisition strategies, and seasonal growth patterns often use available resources more efficiently than communities dominated by a single functional type. Similar principles apply across aquatic ecosystems, forests, grasslands, and marine environments, where ecological complementarity allows multiple species to contribute differently to overall ecosystem performance.

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This growing emphasis on functional diversity has expanded the understanding of biodiversity health beyond simple species counts, encouraging researchers to examine ecological traits, species interactions, and community composition alongside traditional measures of biodiversity.

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Biodiversity Supports Ecosystem Services

 

Healthy ecosystems provide a wide range of ecosystem services that support wildlife populations, environmental processes, and human societies. These services are commonly grouped into several broad categories:

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• Regulating services, including climate regulation, water purification, disease regulation, and carbon storage

• Supporting services, such as nutrient cycling, soil formation, and primary productivity

• Provisioning services, including timber, forage, fisheries, and other biological resources

• Cultural services, encompassing recreation, education, and opportunities for scientific research

 

Extensive evidence indicates that biodiversity strengthens many regulating and supporting ecosystem services. Diverse ecological communities often improve nutrient cycling, stabilize ecosystem processes, and contribute to climate regulation through more efficient carbon storage and vegetation dynamics. Biodiversity also supports agricultural productivity through pollination, natural pest regulation, and soil fertility, illustrating the broad ecological importance of maintaining diverse biological communities (Balvanera et al., 2006; Isbell et al., 2017).

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Research further shows that biodiversity influences ecosystem services across multiple spatial scales. Local species diversity contributes directly to ecological functioning within individual habitats, while surrounding landscape diversity enhances regulating and cultural ecosystem services across broader regions. In contrast, some provisioning services and belowground ecological processes remain more strongly influenced by land management practices, soil characteristics, and other abiotic factors than by biodiversity alone (Provost et al., 2022).

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Another important finding is that ecosystem services often depend on species that do not directly provide visible benefits. Ecological network studies demonstrate that supporting species—including predators, decomposers, pollinators, and organisms occupying intermediate trophic levels—help maintain the ecological interactions necessary for ecosystem services to persist. Consequently, losing seemingly inconspicuous species can indirectly reduce ecosystem performance by disrupting food webs and ecological relationships (Keyes et al., 2021).

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Biodiversity and One Health

 

The importance of biodiversity extends beyond wildlife conservation alone. Contemporary ecological science increasingly recognizes biodiversity as an important component of the One Health framework, which emphasizes the interconnected nature of environmental, animal, and human health.

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Healthy ecosystems support environmental conditions that influence water quality, food security, climate regulation, and the long-term sustainability of natural resources. Biodiversity therefore contributes not only to wildlife health but also to the ecological processes upon which human societies depend. While this relationship is complex and influenced by numerous environmental and socioeconomic factors, the overall scientific consensus indicates that conserving biodiversity strengthens many ecosystem functions that promote environmental health and long-term resilience (Isbell et al., 2017).

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At the same time, researchers emphasize that biodiversity–health relationships should not be oversimplified. Different ecosystem functions respond differently to biodiversity, and outcomes depend on environmental context, ecological interactions, disturbance history, and the specific dimensions of biodiversity being measured. Consequently, modern conservation biology increasingly integrates species diversity, functional diversity, ecological resilience, and ecosystem services when evaluating ecosystem health rather than relying on any single ecological indicator.

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Continued research into biodiversity health remains central to understanding how ecosystems respond to habitat change, climate variability, and other environmental pressures. These findings also provide an important scientific foundation for habitat conservation, which the next section of this pillar explores.

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Habitat Conservation

 

Habitat conservation forms one of the most important foundations of biodiversity and ecosystem health because species depend on suitable environments to survive, reproduce, and interact with one another. Habitats provide the physical space, food resources, water, shelter, breeding sites, and ecological conditions necessary to support wildlife populations and the complex ecological processes that sustain healthy ecosystems. Protecting habitats therefore safeguards not only individual species but also the ecological relationships that maintain biodiversity, ecosystem function, and environmental health.

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From a conservation biology perspective, habitat conservation extends beyond preserving isolated natural areas. It includes maintaining ecological integrity across landscapes, protecting ecological processes, reducing habitat fragmentation, restoring degraded environments, and supporting landscape connectivity that allows species to move, disperse, and adapt to environmental change. These approaches recognize that ecosystems function as interconnected networks rather than collections of independent species.

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Research consistently demonstrates that biodiversity conservation and habitat conservation are inseparable. As habitats degrade or fragment, species diversity often declines, ecological interactions are disrupted, and ecosystem services weaken. Conversely, conserving diverse natural habitats helps maintain ecological functions that support wildlife populations, regulate environmental processes, and contribute to long-term ecosystem resilience (Mori et al., 2017; Pereira et al., 2024).

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Habitat Diversity Supports Biodiversity

 

Natural landscapes contain a mosaic of habitat types, each supporting different ecological communities. Forests, wetlands, grasslands, rivers, coastal ecosystems, and marine environments each provide unique environmental conditions that shape species composition and ecological interactions.

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Habitat diversity contributes directly to ecosystem biodiversity by creating a wider variety of ecological niches. Species with different habitat requirements can coexist across heterogeneous landscapes, increasing both species richness and functional diversity. This diversity of habitats also supports ecological processes such as migration, seasonal movement, reproduction, and dispersal, allowing wildlife populations to respond to changing environmental conditions.

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In addition to supporting species richness, habitat diversity enhances ecosystem multifunctionality. Different habitats contribute distinct ecological functions, including water filtration, nutrient cycling, carbon storage, pollination, flood regulation, and primary productivity. Maintaining multiple habitat types therefore strengthens the capacity of landscapes to provide a broad range of ecosystem services simultaneously.

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Research increasingly shows that biodiversity–ecosystem service relationships operate across multiple spatial scales. Local habitat quality influences ecological processes within individual ecosystems, while surrounding landscape diversity contributes to broader regulating and cultural ecosystem services. Consequently, habitat conservation strategies increasingly consider both site-level management and landscape-scale ecological connectivity (Provost et al., 2022).

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Habitat Fragmentation and Biodiversity Loss

 

One of the greatest challenges facing biodiversity conservation is habitat fragmentation. Fragmentation occurs when continuous natural habitats are divided into smaller, isolated patches through land-use change, infrastructure development, agriculture, or other forms of environmental modification.

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Fragmented habitats often support fewer species because populations become smaller and increasingly isolated. Reduced connectivity limits movement between populations, restricts gene flow, alters predator-prey relationships, and changes ecological interactions throughout food webs. Smaller habitat patches may also experience stronger edge effects, including altered temperature, moisture, invasive species pressure, and increased human disturbance.

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Although the scientific summary focuses primarily on biodiversity–ecosystem functioning relationships rather than fragmentation itself, long-term global projections indicate that continued biodiversity decline is expected under scenarios involving ongoing habitat conversion and insufficient sustainability policies. These projections suggest accompanying reductions in many regulating ecosystem services that healthy ecosystems currently provide (Pereira et al., 2024).

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Habitat fragmentation also illustrates why ecosystem health cannot be measured solely by species counts. Even when many species remain present, disrupted ecological interactions, altered food webs, and reduced functional diversity can impair ecosystem functioning. Maintaining connected, functioning habitats therefore supports both biodiversity conservation and ecological resilience.

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Habitat Conservation Supports Ecosystem Services

 

The ecological benefits of habitat conservation extend beyond preserving wildlife populations. Conserved habitats help sustain many ecosystem services that operate across local, regional, and global scales.

Research demonstrates particularly strong evidence that biodiversity contributes positively to regulating and supporting ecosystem services, including nutrient cycling, climate regulation, carbon sequestration, soil formation, and water regulation. Forests, wetlands, grasslands, and coastal ecosystems each perform specialized ecological functions that collectively maintain environmental stability (Balvanera et al., 2006; Isbell et al., 2017).

For example, forests store substantial amounts of carbon while regulating local and regional climates. Wetlands filter water, reduce flooding, and support aquatic biodiversity. Grasslands contribute to soil stability, nutrient cycling, and primary productivity. Coastal ecosystems protect shorelines while supporting fisheries and marine biodiversity. These examples illustrate how habitat conservation protects the ecological infrastructure that underpins ecosystem services.

However, ecosystem services depend on complex ecological networks rather than isolated species. Studies examining ecological interactions indicate that species occupying supporting ecological roles—including decomposers, pollinators, predators, and organisms at intermediate trophic levels—can be critical for maintaining ecosystem services. Losses among these supporting species may reduce ecosystem performance even when more visible species remain present (Keyes et al., 2021).

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This network perspective reinforces the importance of conserving entire ecological communities instead of focusing exclusively on individual species.

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Conservation in a Changing Environment

 

Modern conservation biology increasingly recognizes that habitat conservation must account for dynamic environmental conditions rather than assuming ecosystems remain static over time. Climate variability, changing disturbance regimes, land-use change, and shifting species distributions all influence how ecosystems function.

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Current research therefore emphasizes protecting ecosystem integrity while maintaining ecological processes that allow species and communities to adapt naturally to environmental change. Rather than simply maximizing species richness, conservation planning increasingly considers functional diversity, ecological interactions, response diversity, and landscape connectivity as important components of sustainable ecosystems.

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Future global biodiversity scenarios suggest that without stronger sustainability policies, biodiversity declines are likely to continue through the coming decades, accompanied by reduced ecosystem functioning and weakened regulating ecosystem services. These projections underscore the importance of habitat conservation as a long-term strategy for maintaining biodiversity health and ecosystem resilience across changing landscapes (Pereira et al., 2024).

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Although habitat conservation is widely recognized as a cornerstone of biodiversity conservation, researchers continue investigating how different conservation strategies influence ecosystem functioning across ecosystems and spatial scales. This ongoing work reflects the complexity of ecological systems and the need for evidence-based approaches that consider both biodiversity and ecosystem processes together.

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Ultimately, habitat conservation supports much more than the persistence of individual species. By protecting natural habitats, maintaining ecological connectivity, and preserving the diversity of ecological communities, conservation efforts help sustain the ecosystem functions and services that underpin healthy wildlife populations and resilient natural environments.

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Learn more in Habitat Conservation.

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Ecosystem Function and Resilience

 

Ecosystem function and resilience are central concepts in understanding how biodiversity supports healthy natural systems. Ecosystem function refers to the biological, chemical, and physical processes that occur within ecosystems, including primary productivity, nutrient cycling, decomposition, energy transfer through food webs, pollination, and carbon storage. Ecological resilience, in contrast, describes an ecosystem's capacity to absorb disturbances, adapt to environmental change, and continue performing essential functions over time.

Although these concepts are closely related, they are not identical. An ecosystem may function efficiently under stable conditions yet respond differently when exposed to drought, habitat disturbance, invasive species, or climate variability. Modern conservation biology therefore evaluates both ecosystem functioning and resilience when assessing ecosystem health.

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Over the past several decades, biodiversity–ecosystem functioning (BEF) research has become one of the most active fields in ecology. Collectively, experimental studies, long-term field observations, and global syntheses demonstrate strong evidence that biodiversity generally enhances ecosystem functioning. However, resilience and stability involve more complex ecological mechanisms than species richness alone can explain (Tilman et al., 2014; Van Der Plas, 2019; Mittelbach & McGill,, 2019).

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Biodiversity Enhances Ecosystem Function

 

Across terrestrial, freshwater, and marine ecosystems, higher biodiversity is consistently associated with stronger ecosystem functioning. Experimental evidence shows that diverse ecological communities generally produce more biomass, retain nutrients more effectively, and utilize available resources more efficiently than communities composed of fewer species. These positive relationships have been documented across multiple ecosystem types and remain one of the strongest findings in modern ecology (Tilman et al., 2014).

Several ecological mechanisms help explain these observations.

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One important mechanism is resource complementarity, in which species differ in how they acquire light, nutrients, water, or food resources. Rather than competing directly for identical resources, species with complementary ecological traits occupy different niches, allowing the community as a whole to use available resources more efficiently.

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A second mechanism involves resource partitioning, where organisms specialize in different habitats, seasons, prey types, or ecological roles. This specialization reduces competition while increasing overall ecosystem productivity.

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Researchers also describe functional compensation, in which species performing similar ecological functions compensate when one species declines. Because ecological roles overlap partially rather than completely, ecosystem processes often continue despite fluctuations in individual species populations.

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Together, these mechanisms help explain why biodiversity contributes positively to ecosystem function across diverse environmental conditions (Tilman et al., 2014; Mori et al., 2013; Weisser et al., 2017).

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Ecosystem Stability Develops Over Time

 

One of the most important advances in biodiversity research has come from long-term ecological experiments. Rather than measuring ecosystem responses over a single growing season or a few years, these studies have followed ecological communities for decades to understand how biodiversity influences ecosystem stability through time.

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Long-term grassland experiments demonstrate that biodiversity–stability relationships often strengthen as ecological communities mature. Highly diverse plant communities generally maintain more consistent productivity over time, whereas communities containing fewer species tend to lose productivity more rapidly.

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Researchers attribute this pattern to ecological processes that require time to develop. As communities establish themselves, complementarity among species strengthens, ecological interactions become more complex, and different species respond asynchronously to environmental fluctuations. When some species decline during unfavorable conditions, others continue functioning, reducing variation in overall ecosystem performance (Wagg et al., 2022).

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The long-running Jena grassland experiment illustrates this principle clearly. Investigators found that many biodiversity effects emerged only after several years, with nearly half of the measured ecosystem processes responding significantly to increasing plant species richness. These findings demonstrate that short-term studies may underestimate the long-term ecological benefits of biodiversity because stabilizing interactions develop gradually within ecological communities (Weisser et al., 2017).

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These long-term observations have strengthened scientific understanding of ecological resilience by emphasizing that ecosystem stability is an emergent property resulting from numerous interacting species rather than the influence of any single organism.

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Resilience Depends on More Than Species Richness

 

Although biodiversity frequently supports ecosystem resilience, the relationship is more nuanced than once believed. Earlier ecological models often assumed that adding more species would consistently improve resilience under all environmental conditions. Contemporary research paints a more complex picture.

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One important concept is response diversity, which describes variation in how species performing similar ecological functions respond to environmental disturbances. Species occupying comparable ecological roles may differ in their tolerance to drought, disease, warming, flooding, or other environmental pressures. This diversity of responses allows ecosystem functions to continue even when some species decline.

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Consequently, ecosystems with greater response diversity often show improved long-term resilience because ecological functions are distributed across species with different environmental tolerances rather than concentrated in a few vulnerable organisms (Mori et al., 2013).

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However, evidence also indicates that species richness alone is an incomplete predictor of resilience.

Experimental studies involving aquatic microbial communities found that increasing biodiversity improved temporal ecosystem stability but simultaneously reduced resistance to warming under certain conditions. Similarly, analyses of lake sediment records found no consistent overall positive relationship between species richness and ecological resilience near abrupt ecological transitions (Pennekamp et al., 2018; Su et al., 2024).

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These findings do not contradict the broader scientific consensus supporting biodiversity. Instead, they demonstrate that resilience depends on multiple ecological characteristics, including functional diversity, trophic interactions, disturbance type, environmental context, and ecosystem structure. Species richness remains important, but it represents only one component of ecosystem resilience.

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Ecosystem Function Across Multiple Scales

 

Another important development in biodiversity science involves recognizing that ecosystem function operates across multiple spatial and temporal scales.

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At local scales, biodiversity influences processes such as primary productivity, decomposition, nutrient cycling, and species interactions within individual habitats. At broader landscape and regional scales, biodiversity contributes to climate regulation, watershed function, pollination networks, fisheries productivity, and other ecosystem services extending beyond individual ecosystems.

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Research shows that biodiversity also influences ecosystem services differently depending on ecological scale. Local plant diversity often supports cultural and regulating ecosystem services, while broader landscape diversity enhances ecological interactions among habitats. At the same time, certain provisioning services remain more strongly affected by land management practices and abiotic environmental conditions than biodiversity alone (Provost et al., 2022; Isbell et al., 2017).

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Ecological networks further demonstrate that maintaining ecosystem function depends not only on highly visible species but also on organisms occupying supporting ecological roles. Indirect species losses can weaken ecosystem services even when the primary service-providing species remain present, emphasizing the importance of conserving complete ecological communities rather than isolated species (Keyes et al., 2021).

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Continuing Questions in Biodiversity Research

 

Although the overall evidence strongly supports positive relationships between biodiversity and ecosystem functioning, several important questions continue to guide ecological research.

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Scientists continue investigating which dimensions of biodiversity—such as taxonomic, functional, genetic, or response diversity—best predict ecosystem performance under different environmental conditions. Attention is also increasing on understanding biodiversity–ecosystem relationships across larger spatial scales, where ecological processes interact across landscapes and regions.

Another active area of research examines how biodiversity contributes to ecosystem multifunctionality, recognizing that ecosystems perform numerous interconnected functions simultaneously rather than operating through isolated processes. These studies seek to better understand how ecological communities balance productivity, nutrient cycling, climate regulation, resilience, and ecosystem services within changing environments.

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Current global projections indicate that continued biodiversity declines could reduce regulating ecosystem services and alter ecosystem functioning during the coming decades if stronger sustainability measures are not implemented (Pereira et al., 2024). These projections reinforce the importance of ongoing research into biodiversity conservation, ecosystem resilience, and ecological sustainability.

Overall, current scientific evidence supports a clear conclusion: biodiversity is a primary driver of ecosystem function and an important contributor to long-term ecological resilience. At the same time, ecosystem health depends on far more than the number of species present. Functional diversity, ecological interactions, response diversity, habitat quality, and environmental conditions all interact to shape how ecosystems function, recover from disturbance, and continue supporting wildlife and the ecosystem services upon which life depends.

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Learn more in Ecosystem Function and Resilience.

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Current Research Themes

 

Research on biodiversity and ecosystem health continues to evolve as scientists investigate how ecological systems respond to environmental change across different spatial and temporal scales. While decades of research have established that biodiversity generally supports ecosystem functioning, current studies increasingly seek to understand why these relationships occur, when they are strongest, and which dimensions of biodiversity contribute most to healthy ecosystems.

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Several major research themes are shaping contemporary conservation biology.

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Functional Diversity Versus Species Richness

 

One of the most active areas of research examines whether ecosystem performance is better explained by the number of species present or by the diversity of ecological functions those species perform.

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Evidence increasingly indicates that functional diversity and response diversity often predict ecosystem multifunctionality, productivity, and resilience more effectively than taxonomic richness alone. As a result, many studies now evaluate ecological traits, niche specialization, and species interactions alongside traditional biodiversity metrics (Van Der Plas, 2019; Yan et al., 2023).

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Biodiversity Across Spatial Scales

 

Researchers are also investigating how biodiversity influences ecosystem services across landscapes rather than only within individual habitats.

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Recent studies demonstrate that local biodiversity interacts with surrounding landscape diversity to influence regulating, supporting, and cultural ecosystem services. Understanding these multi-scale relationships is becoming increasingly important for conservation planning and sustainable ecosystem management (Provost et al., 2022).

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Ecosystem Multifunctionality

 

Healthy ecosystems perform numerous ecological processes simultaneously. Rather than studying individual ecosystem functions in isolation, researchers increasingly examine ecosystem multifunctionality, which evaluates how biodiversity supports multiple ecosystem processes at the same time.

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This approach recognizes that nutrient cycling, primary productivity, decomposition, carbon storage, pollination, and ecological stability interact rather than functioning independently.

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Ecological Networks

 

Another emerging research direction focuses on ecological networks and species interactions.

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Scientists increasingly recognize that supporting species—including pollinators, decomposers, predators, and organisms occupying intermediate trophic levels—play important roles in maintaining ecosystem services. Understanding these ecological networks improves predictions of how biodiversity loss may influence ecosystem function beyond the direct loss of individual species (Keyes et al., 2021).

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Biodiversity Under Global Environmental Change

 

Climate change, habitat fragmentation, land-use change, invasive species, and other anthropogenic pressures continue to reshape ecosystems worldwide.

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Current global projections suggest that continued biodiversity decline could reduce regulating ecosystem services and alter ecosystem functioning throughout the coming decades if stronger sustainability measures are not implemented. Consequently, biodiversity conservation increasingly emphasizes maintaining ecosystem integrity, ecological resilience, and adaptive capacity under changing environmental conditions (Pereira et al., 2024).

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Frequently Asked Questions

 

What is biodiversity and ecosystem health?

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Biodiversity refers to the variety of life at genetic, species, functional, and ecosystem levels. Ecosystem health describes an ecosystem's ability to maintain ecological processes, support wildlife, and continue functioning over time despite environmental change.

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Why is biodiversity important for ecosystem health?

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Research consistently shows that biodiversity supports ecosystem productivity, nutrient cycling, ecosystem services, and long-term ecological functioning. Diverse ecosystems often perform ecological processes more efficiently than ecosystems containing fewer species, although outcomes depend on ecological context and environmental conditions (Tilman et al., 2014).

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Does more biodiversity always increase ecosystem resilience?

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Not necessarily. Biodiversity often contributes to resilience, but resilience depends on multiple factors, including functional diversity, response diversity, ecological interactions, disturbance type, and habitat quality. Species richness alone does not fully explain ecosystem resilience (Mori et al., 2013; Su et al., 2024).

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What are ecosystem services?

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Ecosystem services are the benefits ecosystems provide through ecological processes. Examples include nutrient cycling, climate regulation, pollination, water purification, soil formation, fisheries, forestry resources, recreation, and wildlife habitat.

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What is functional diversity?

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Functional diversity refers to the variety of ecological roles organisms perform within a community. Because species contribute different ecological functions, functional diversity often predicts ecosystem performance better than species richness alone.

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How does habitat conservation support biodiversity?

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Habitat conservation protects the environmental conditions that allow species to survive, reproduce, interact, and maintain ecological processes. Conserving habitats also helps sustain ecosystem services, ecological connectivity, and long-term ecosystem resilience.

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What is the relationship between biodiversity and One Health?

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The One Health framework recognizes that environmental health, animal health, and human health are interconnected. Healthy ecosystems support ecological processes that contribute to environmental sustainability and wildlife conservation, making biodiversity an important component of One Health.

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Explore Related Topics

 

Continue exploring the Wildlife & Conservation Health knowledge system:

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• Wildlife & Conservation Health Overview

• Biodiversity and Health

• Habitat Conservation

• Ecosystem Function and Resilience