Biodiversity plays an essential role in the resistance and resilience of ecosystems, but the mechanisms by which it enhances these properties can vary.
Resistance refers to an ecosystem's ability to resist changes or disturbances, while resilience refers to an ecosystem's ability to recover from such changes or disturbances.
Studies have shown that high levels of biodiversity can increase the resistance of ecosystems to disturbance. This is because species-rich ecosystems often have a greater variety of functional traits, such as different growth forms, rooting depths, and reproductive strategies, that allow them to cope better with changes in environmental conditions, such as drought or nutrient availability. Additionally, high biodiversity can also increase the diversity of ecological interactions, such as predation and competition, which can further enhance ecosystem resistance to disturbance.
However, the relationship between biodiversity and resilience is more complex. While high biodiversity can enhance the resilience of an ecosystem in some cases, it is not always the case. For example, a highly diverse ecosystem may be less resilient to disturbances that selectively target specific species, such as invasive species or diseases, as they may disproportionately affect a few dominant species and result in cascading impacts across the ecosystem. In these cases, a more even distribution of species may be more beneficial for resilience.
Furthermore, biodiversity can also have other important implications for ecosystem functioning beyond its effects on resistance and resilience. For instance, biodiversity can enhance ecosystem productivity, nutrient cycling, and carbon storage, which are all critical for sustaining agricultural productivity.
In agricultural landscapes, maintaining biodiversity can provide several benefits, such as improving soil health, controlling pests and diseases, and increasing pollination and seed dispersal, which are essential for crop production. In addition, biodiversity can provide important ecosystem services that benefit human well-being, such as clean water and air, recreational opportunities, and cultural values.
However, agricultural practices often lead to the loss of biodiversity, primarily through habitat destruction and fragmentation, pollution, and introduction of non-native species. As a result, many agricultural landscapes are becoming increasingly simplified and dominated by a few highly productive crop species, which can reduce their resilience to disturbances and increase their vulnerability to pest outbreaks and soil degradation.
Therefore, promoting biodiversity in agricultural landscapes is essential for enhancing the sustainability and resilience of agricultural systems. This can be achieved through the adoption of practices that enhance landscape heterogeneity, such as agroforestry, intercropping, and crop rotations, and the use of ecological principles in agricultural management, such as promoting beneficial insect populations and enhancing soil health.
Biodiversity consistently increases resistance; however, biodiversity effects on resilience depend on the direction and duration of climate events. Biologically diverse communities are also more likely to contain species that confer resilience to that ecosystem because as a community accumulates species, there is a higher chance of any one of them having traits that enable them to adapt to a changing environment. Biodiversity increases the resistance of ecosystem productivity to climate extremes. When major crisis develop diverse organizations are better able to proactively adapt. In the coping stage diversity is helpful for resilient coping by constructing a greater variety of interpretations for adverse situations. Ecosystems with higher biodiversity tend to be more stable with greater resistance and resilience in the face of disturbances, or disruptive events. That is, biodiversity can increase overall ecosystem stability when biodiversity is low, and decrease it when biodiversity is high, or the opposite with a U-shaped relationship. Diversity and biological balance may influence the functioning and stability of ecological systems. Scientists generally agree that as the number of species in any particular type of ecological system declines, that system can potentially lose its resilience. In general, resistance refers to the ability of a population to withstand the disturbance, whereas resilience refers to the ability to recover after suffering from the disturbance. The “resistance-resilience framework” helps us understand ecological resilience and the role resistance plays. It's easy to confuse these two closely related concepts of ecosystem change: resistance is the ability to persist or withstand a disturbance, and resilience is the ability to recover once a disturbance ends. Ecological resilience, as ecological robustness, the ability of an ecosystem to maintain its normal patterns of nutrient cycling and biomass production after being subjected to damage caused by an ecological disturbance. Resilience is the ability of an ecosystem to return to a previous state following disturbance. Ecological communities may demonstrate resilience after long periods of time.