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Predicting the consequences of species lossusing size-structured biodiversity approaches
German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, 04103, Leipzig, Germany 2 Faculty of Biology and Pharmacy, Institute of Ecology, Friedrich Schiller University Jena, 07743, Jena, Germany.
Institute for Marine and Antarctic Studies and Centre for Marine Socioecology, University of Tasmania, 20 Castray Esplanade, Battery Point TAS 7004 Australia.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Biology. Linköping University, Faculty of Science & Engineering.
Ecological Networks and Global Change Group, Experimental Ecology Station, Centre National de la Recherche Scientifique, 09200, Moulis, France.
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2017 (English)In: Biological Reviews, ISSN 1464-7931, E-ISSN 1469-185X, Vol. 92, no 2, 684-697 p.Article, review/survey (Refereed) Published
Abstract [en]

Understanding the consequences of species loss in complex ecological communities is one of the great challenges in current biodiversity research. For a long time, this topic has been addressed by traditional biodiversity experiments. Most of these approaches treat species as trait-free, taxonomic units characterizing communities only by species number without accounting for species traits. However, extinctions do not occur at random as there is a clear correlation between extinction risk and species traits. In this review, we assume that large species will be most threatened by extinction and use novel allometric and size-spectrum concepts that include body mass as a primary species trait at the levels of populations and individuals, respectively, to re-assess three classic debates on the relationships between biodiversity and (i) food-web structural complexity, (ii) community dynamic stability, and (iii) ecosystem functioning. Contrasting current expectations, size-structured approaches suggest that the loss of large species, that typically exploit most resource species, may lead to future food webs that are less interwoven and more structured by chains of interactions and compartments. The disruption of natural body-mass distributions maintaining food-web stability may trigger avalanches of secondary extinctions and strong trophic cascades with expected knock-on effects on the functionality of the ecosystems. Therefore, we argue that it is crucial to take into account body size as a species trait when analysing the consequences of biodiversity loss for natural ecosystems. Applying size-structured approaches provides an integrative ecological concept that enables a better understanding of each species' unique role across communities and the causes and consequences of biodiversity loss.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2017. Vol. 92, no 2, 684-697 p.
Keyword [en]
biodiversity, extinctions, complexity, food webs, stability, ecosystem functioning, global change, allometric scaling, size spectrum.
National Category
Ecology
Identifiers
URN: urn:nbn:se:liu:diva-136455DOI: 10.1111/brv.12250ISI: 000398567200005PubMedID: 26756137Scopus ID: 2-s2.0-84954290365OAI: oai:DiVA.org:liu-136455DiVA: diva2:1087990
Note

Funding agencies: Research Network Programme of the European Science Foundation on body size and ecosystem dynamics (SIZEMIC); German Centre for integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig - German Research Foundation [FZT 118]; Leibniz Competition [SAW-201

Available from: 2017-04-10 Created: 2017-04-10 Last updated: 2017-04-20Bibliographically approved

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