Biogeographical Modules and Island Roles: a Comparison of Wallacea
Journal of Biogeography (J. Biogeogr.) (2012) 39, 739–749 ORIGINAL Biogeographical modules and island ARTICLE roles: a comparison of Wallacea and the West Indies Daniel W. Carstensen1*, Bo Dalsgaard2,3, Jens-Christian Svenning4, Carsten Rahbek3, Jon Fjeldsa˚5, William J. Sutherland2 and Jens M. Olesen1 1Department of Bioscience, Aarhus University, ABSTRACT Ny Munkegade 114, DK-8000 Aarhus, Aim In order to advance our understanding of the assembly of communities on Denmark, 2Conservation Science Group, Department of Zoology, University of islands and to elucidate the function of different islands in creating regional and Cambridge, Downing Street, Cambridge CB2 subregional distribution patterns, we identify island biogeographical roles on the 3EJ, UK, 3Center for Macroecology, Evolution basis of the distribution of the islands’ biota within the archipelago. We explore and Climate, Department of Biology, which island characteristics determine island biogeographical roles. Furthermore, University of Copenhagen, Universitetsparken we identify biogeographical subregions, termed modules. 15, DK- 2100 Copenhagen, Denmark, Location Wallacea in Indonesia, and the West Indies in the Caribbean Sea. 4Ecoinformatics and Biodiversity Group, Department of Bioscience, Aarhus University, Methods We use a network approach to detect island biogeographical roles and Ny Munkegade 114, DK-8000 Aarhus, avian biogeographical modules. To designate the biogeographical role of an Denmark, 5Center for Macroecology, Evolution island, each island is assigned two coordinates, l and r. The position of an island and Climate, Natural History Museum of in l–r space characterizes its role, namely as peripheral, connector, module hub, Denmark, University of Copenhagen, DK-2100 or network hub. Island characteristics are tested as predictors of l and r.
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