Journal Article

Borneo and Indochina are Major Evolutionary Hotspots for Southeast Asian Biodiversity

Mark de Bruyn, Björn Stelbrink, Robert J. Morley, Robert Hall, Gary R. Carvalho, Charles H. Cannon, Gerrit van den Bergh, Erik Meijaard, Ian Metcalfe, Luigi Boitani, Luigi Maiorano, Robert Shoup and Thomas von Rintelen

in Systematic Biology

Published on behalf of Society of Systematic Biologists

Volume 63, issue 6, pages 879-901
Published in print November 2014 | ISSN: 1063-5157
Published online July 2014 | e-ISSN: 1076-836X | DOI: https://dx.doi.org/10.1093/sysbio/syu047
Borneo and Indochina are Major Evolutionary Hotspots for Southeast Asian Biodiversity

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Tropical Southeast (SE) Asia harbors extraordinary species richness and in its entirety comprises four of the Earth's 34 biodiversity hotspots. Here, we examine the assembly of the SE Asian biota through time and space. We conduct meta-analyses of geological, climatic, and biological (including 61 phylogenetic) data sets to test which areas have been the sources of long-term biological diversity in SE Asia, particularly in the pre-Miocene, Miocene, and Plio-Pleistocene, and whether the respective biota have been dominated by in situ diversification, immigration and/or emigration, or equilibrium dynamics. We identify Borneo and Indochina, in particular, as major “evolutionary hotspots” for a diverse range of fauna and flora. Although most of the region's biodiversity is a result of both the accumulation of immigrants and in situ diversification, within-area diversification and subsequent emigration have been the predominant signals characterizing Indochina and Borneo's biota since at least the early Miocene. In contrast, colonization events are comparatively rare from younger volcanically active emergent islands such as Java, which show increased levels of immigration events. Few dispersal events were observed across the major biogeographic barrier of Wallace's Line. Accelerated efforts to conserve Borneo's flora and fauna in particular, currently housing the highest levels of SE Asian plant and mammal species richness, are critically required.

Keywords: Biogeography; climate change; Ecology; Geology; Palynology; Phylogenetics

Journal Article.  10600 words.  Illustrated.

Subjects: Biological Sciences

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