Biodiversity Dynamics in Disturbed Ecosystems

Disturbances, whether natural or anthropogenic, shape the composition, structure and functioning of ecological communities by altering resource availability, habitat configuration and species interactions. Such events range from discrete pulses, like storms or heatwaves, to chronic presses, such as sustained grazing or pollution. The response of biodiversity to disturbance is governed by the interplay of resistance (the capacity to withstand change) and resilience (the capacity to recover), moderated by species’ traits, trophic interactions and spatial processes. At local scales, moderate disturbance can enhance coexistence by preventing competitive exclusion, while at landscape scales, habitat loss and fragmentation can impede dispersal and reduce regional species pools. Trait‐based differences in colonisation and competition, spatial insurance effects from regional connectivity and cross‐scale feedbacks all contribute to the dynamic patterns of diversity observed in disturbed ecosystems. Understanding these dynamics is critical for predicting ecosystem trajectories under global change and for devising management strategies that sustain ecosystem services.

Research from Nature Portfolio

Investigations into temperate grasslands have shown that moderate levels of anthropogenic disturbance, such as grazing or fire, can maintain peak plant species richness in accordance with the intermediate disturbance hypothesis. Building on these findings, theoretical and modelling approaches have extended patch‐dynamic frameworks to quantify how patch loss and fragmentation affect food‐chain dynamics, revealing that species at higher trophic levels are disproportionately vulnerable to reductions in habitat connectivity and patch availability. Complementary experimental work in model microbial communities has further highlighted the interplay between biotic interactions and disturbance type, demonstrating that predation pressure and resource deprivation jointly influence community resistance and recovery, with multi‐stage sampling unveiling transient relief of predation followed by shifts in community composition.

Biodiversity Dynamics in Disturbed Ecosystems publication trend

The graph below shows the total number of articles in biodiversity dynamics in disturbed ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Disturbance regime: The pattern of disturbance events characterised by their frequency, intensity, duration and spatial extent.

Intermediate Disturbance Hypothesis: A theoretical prediction that species richness peaks at moderate levels of disturbance due to a balance between colonisation and competitive exclusion.

Metacommunity: A set of local communities linked by the dispersal of multiple interacting species across a landscape.

Patch fragmentation: The breaking up of continuous habitat into smaller, isolated patches, affecting connectivity and species movement.

Resistance: The ability of a community to maintain its structure and function in the face of disturbance.

Resilience: The capacity of a community to recover its structure and function following disturbance.

Spatial insurance hypothesis: A concept that dispersal from a diverse regional species pool can buffer local community dynamics against environmental fluctuations and disturbances.

References

1. Spatial insurance against a heatwave differs between trophic levels in experimental aquatic communities. Global Change Biology (2023).
2. Diversity loss from multiple interacting disturbances is regime‐dependent. Ecology Letters (2023).
3. Anthropogenic disturbances are key to maintaining the biodiversity of grasslands. Scientific Reports (2016).
4. Climate warming in the Himalayas threatens biodiversity, ecosystem functioning and ecosystem services in the 21st century: is there a better solution?. Biodiversity and Conservation (2022).
5. An extended patch-dynamic framework for food chains in fragmented landscapes. Scientific Reports (2016).
6. Interactions between predation and disturbances shape prey communities. Scientific Reports (2018).