The island–mainland species turnover relationship

Stuart, Yoel E. and Losos, Jonathan B. and Algar, Adam C. (2012) The island–mainland species turnover relationship. Proceedings of the Royal Society B: Biological Sciences, 279 (1744). pp. 4071-4077. ISSN 0962-8452

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Abstract

Many oceanic islands are notable for their high endemism, suggesting that islands may promote unique assembly processes. However, mainland assemblages sometimes harbour comparable levels of endemism, suggesting that island biotas may not be as unique as is often assumed. Here, we test the uniqueness of island biotic assembly by comparing the rate of species turnover among islands and the mainland, after accounting for distance decay and environmental gradients. We modelled species turnover as a function of geographical and environmental distance for mainland (M–M) communities of Anolis lizards and Terrarana frogs, two clades that have diversified extensively on Caribbean islands and the mainland Neotropics. We compared mainland–island (M–I) and island–island (I–I) species turnover with predictions of the M–M model. If island assembly is not unique, then the M–M model should successfully predict M–I and I–I turnover, given geographical and environmental distance. We found that M–I turnover and, to a lesser extent, I–I turnover were significantly higher than predicted for both clades. Thus, in the first quantitative comparison of mainland–island species turnover, we confirm the long-held but untested assumption that island assemblages accumulate biodiversity differently than their mainland counterparts.

Item Type: Article
Schools/Departments: University of Nottingham UK Campus > Faculty of Social Sciences > School of Geography
Depositing User: Johnson, Mrs Alison
Date Deposited: 28 Mar 2014 11:36
Last Modified: 16 Sep 2016 05:22
URI: http://eprints.nottingham.ac.uk/id/eprint/2560

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