Multiple Stressor Interactions in Ecosystem Dynamics

Interactions among multiple stressors—such as temperature rise, pollution, habitat alteration and acidification—shape ecosystem structure and function in complex, often non-linear ways. When two or more stressors occur simultaneously, their joint influence can be additive, synergistic (where combined impact exceeds the sum of individual effects) or antagonistic (where one stressor diminishes the impact of another). These patterns arise from processes acting at molecular, population and community levels, including physiological thresholds, trophic interactions and alterations to biogeochemical cycles. Experimental designs, ranging from factorial manipulations to high-throughput screening and meta-analyses, reveal that stressor combinations can drive unexpected ‘ecological surprises’ such as rapid regime shifts or emergent resilience. Spatial heterogeneity, temporal dynamics and species-specific traits mediate these outcomes, challenging conventional risk assessments based on single-stressor paradigms. Understanding these interactions is essential for forecasting ecosystem trajectories under global change, informing conservation strategies and guiding adaptive management to maintain biodiversity and ecosystem services worldwide.

Research from Nature Portfolio

High-throughput characterisation of bacterial responses to complex chemical mixtures has demonstrated that microbial growth responses to multi-pollutant combinations are not readily predicted from single-stressor assays. Using a matrix of eight agrochemical stressors, researchers revealed that community context confers enhanced resilience and that net interactive effects emerge only under more intricate mixtures. Separately, a meta-analysis of ocean warming and acidification across marine trophic levels found that additive and antagonistic interactions prevail over synergistic effects, with tolerance varying by trophic position and climatic region. Predators exhibited the greatest resistance, while interactive outcomes shifted from synergistic in temperate zones to compensatory or positive in subtropical and tropical regions, emphasising the need for regional nuance in marine management.

Research from all publishers

A systematic review of 2,396 freshwater experiments quantified trends in multiple-stressor research, grouping over 900 stressors into a comprehensive taxonomy. The synthesis highlighted biases toward particular driver combinations and revealed mismatches between statistical interaction classifications and ecological processes, prompting new guidelines for experimental design. In marine systems, a critical appraisal of current experimental methods advocated integrating process-based models with innovative full-factorial and response-surface designs to improve predictive power. This work underscores the importance of optimal and adaptive experimental frameworks for capturing the complexity of stressor interactions and translating findings into robust ecological forecasts.

Multiple Stressor Interactions in Ecosystem Dynamics publication trend

The graph below shows the total number of articles in multiple stressor interactions in ecosystem dynamics across all publications each year (not limited to Nature Index journals).

Technical terms

Additive interaction: Combined effect equal to the sum of individual stressor effects.

Synergistic interaction: Combined effect exceeds the sum of individual stressor effects.

Antagonistic interaction: Combined effect is less than the sum of individual stressor effects or one stressor mitigates another.

Factorial experiment: Experimental design testing all possible combinations of two or more factors to assess individual and joint effects.

Meta-analysis: Statistical synthesis of results from multiple studies to identify general patterns in stressor interactions.

References

1. High-throughput characterization of bacterial responses to complex mixtures of chemical pollutants. Nature Microbiology (2024).
2. Responses of marine trophic levels to the combined effects of ocean acidification and warming. Nature Communications (2024).
3. Studying interactions among anthropogenic stressors in freshwater ecosystems: A systematic review of 2396 multiple‐stressor experiments. Ecology Letters (2024).
4. Designing More Informative Multiple-Driver Experiments. Annual Review of Marine Science (2023).