Divergent biodiversity change within ecosystems.

Autor:	Magurran AE; Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews KY16 9TH, Scotland, United Kingdom; aem1@st-andrews.ac.uk., Deacon AE; Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews KY16 9TH, Scotland, United Kingdom.; Department of Life Sciences, The University of the West Indies, St. Augustine, Trinidad and Tobago., Moyes F; Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews KY16 9TH, Scotland, United Kingdom., Shimadzu H; Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews KY16 9TH, Scotland, United Kingdom.; Department of Mathematical Sciences, Loughborough University, Loughborough LE11 3TU, United Kingdom., Dornelas M; Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews KY16 9TH, Scotland, United Kingdom., Phillip DAT; Department of Life Sciences, The University of the West Indies, St. Augustine, Trinidad and Tobago., Ramnarine IW; Department of Life Sciences, The University of the West Indies, St. Augustine, Trinidad and Tobago.
Jazyk:	angličtina
Zdroj:	Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2018 Feb 20; Vol. 115 (8), pp. 1843-1847. Date of Electronic Publication: 2018 Feb 12.
DOI:	10.1073/pnas.1712594115
Abstrakt:	The Earth's ecosystems are under unprecedented pressure, yet the nature of contemporary biodiversity change is not well understood. Growing evidence that community size is regulated highlights the need for improved understanding of community dynamics. As stability in community size could be underpinned by marked temporal turnover, a key question is the extent to which changes in both biodiversity dimensions (temporal α- and temporal β-diversity) covary within and among the assemblages that comprise natural communities. Here, we draw on a multiassemblage dataset (encompassing vertebrates, invertebrates, and unicellular plants) from a tropical freshwater ecosystem and employ a cyclic shift randomization to assess whether any directional change in temporal α-diversity and temporal β-diversity exceeds baseline levels. In the majority of cases, α-diversity remains stable over the 5-y time frame of our analysis, with little evidence for systematic change at the community level. In contrast, temporal β-diversity changes are more prevalent, and the two diversity dimensions are decoupled at both the within- and among-assemblage level. Consequently, a pressing research challenge is to establish how turnover supports regulation and when elevated temporal β-diversity jeopardizes community integrity. Competing Interests: The authors declare no conflict of interest.
Databáze:	MEDLINE
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