20octobre 2016

Biodiversity and ecosystem services

Par: Cayetano Gutierrez Canovas Lieu: UMR MARBEC, Montpellier

The Earth is experiencing a global biodiversity decline, which can alter the provision of the essential benefits people obtain from ecosystems (ecosystem services, ES). However, despite recent advances, it remains unclear whether few or more organisms are needed to sustain simultaneously multiple ES. Here, we present a novel framework to perform a mechanistic test of the role of multiple biodiversity features in driving single and multiple ES, using empirical and literature data. We investigate whether recreational services provided by culturally-valued birds and commercial fish are better predicted by key prey traits or their diversity. Our results showed that key prey trait combinations better predict multiple ES, compared to diversity. Model results showed trade-offs between ES, which can be simultaneously sustained only at a maximum of 33% of their capacity. The analytical framework and results presented here can help to better understand the mechanisms by which biodiversity drives multiple ES and improve ecosystem management.
Key functional roles are more important than diversity in predicting multiple ecosystem services

MARBEC MARine Biodiversity, Exploitation and Conservation, is a research unit which includes the staff of 4 organizations: IRD, IFREMER, UM and CNRS. Its objective is the study of marine biodiversity in lagoon coastal and offshore ecosystems, at different integration levels, molecular, individual, population and community aspects and the way humans use this biodiversity.