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Loss of functionally unique species may gradually undermine ecosystems
Eoin J O'Gorman1, Jon M Yearsley, Tasman P Crowe
1School of Biology and Environmental Science, Science Centre West, University College Dublin, Belfield, Dublin 4, Ireland. eoin.ogorman@ucd.ie
Proceedings. Biological Sciences
|November 26, 2010
Summary
Highly unique species in ecosystems tend to have weaker interactions, contributing to stability. Losing these species may destabilize ecosystems, leading to unpredictable changes in functioning.
Area of Science:
- Ecology
- Ecosystem Dynamics
- Food Web Analysis
Background:
- Functionally unique species enhance ecosystem functioning and diversity.
- Abundant, weakly interacting species contribute to ecosystem stability.
- The relationship between species uniqueness and interaction strength is crucial for ecosystem stability.
Purpose of the Study:
- To investigate the link between functional uniqueness of species and their interaction strength in food webs.
- To determine how this relationship influences ecosystem functioning and stability.
- To assess the impact of losing unique, weakly interacting species on ecosystem dynamics.
Main Methods:
- Analysis of 213 real-world food webs.
- Quantification of species' functional uniqueness and mean interaction strength.
- Examination of the influence of body size, trophic position, and food web resolution.
Main Results:
- Highly unique species consistently exhibit the weakest mean interaction strength per unit biomass.
- This pattern is influenced by size structuring in aquatic systems and trophic position.
- Food web resolution significantly affects the observed relationship, with coarser resolutions weakening it.
- Food webs with fewer unique, weakly interacting species show greater variability in primary production.
Conclusions:
- A strong link exists between species' functional uniqueness and weak interaction strength.
- The loss of highly unique, weakly interacting species can lead to ecosystem destabilization.
- Such losses may result in unpredictable state changes and altered ecosystem functioning.
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