Endemism and evolutionary history in conflict over Madagascar’s freshwater conservation priorities |
| |
Authors: | B Isambert J Bergsten MT Monaghan H Andriamizehy T Ranarilalatiana M Ratsimbazafy JR Andriniainimanana AP Vogler |
| |
Institution: | aDepartment of Entomology, Darwin Centre 2, Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom;bDepartment of Biology, Imperial College London, Silwood Park Campus, Ascot SL5 7PY, United Kingdom;cDepartment of Entomology, Swedish Museum of Natural History, Box 50007, SE 10405 Stockholm, Sweden;dLeibniz Institute of Freshwater Ecology and Inland Fisheries , Müggelseedamm 301, 12587 Berlin, Germany;eDépartement d’Entomologie, Faculté des Sciences, BP 906, Université d’Antananarivo, Antananarivo 101, Madagascar |
| |
Abstract: | Regional-scale biodiversity indicators provide important criteria for the selection of protected areas in conservation, but their application is often hindered by a lack of taxonomic knowledge. Moreover, different indicators include different types of information, sometimes leading to divergent conservation priorities. Madagascar tops the world list of biodiversity hotspots and much conservation effort has been directed toward its threatened plants and vertebrates. In contrast, its highly diverse freshwater invertebrate fauna has received comparatively little conservation attention. We conducted an inventory of Malagasy adephagan water beetles (Coleoptera, Dytiscidae, Noteridae, Gyrinidae, Haliplidae) using a combined morphological and molecular approach. In total, 2043 beetles from 153 sites were sequenced for cytochrome oxidase subunit I (cox1), and species delimitation was carried out using the coalescent-based GMYC model. Phylogenetic relationships of the resulting entities were established using cox1 combined with partial 16S rRNA and 28S rRNA sequences. Ten national parks were assessed for their species richness, phylogenetic diversity (PD) and endemism. We were particularly interested in the contribution of endemic species to PD. Congruence between molecular and taxonomic identifications was high (91%), with 69% of sampled species endemic to Madagascar. Interestingly, we found that PD at a site was negatively correlated to the proportion of endemic species, most likely because endemics are the result of recent radiations with relatively little branch-length contribution to the measure of PD. This suggests that ranking sites for conservation priority based solely on PD potentially disfavor endemic species by underrating areas where the evolutionary process is most active. |
| |
Keywords: | Phylogenetic diversity Species richness Protected areas Coleoptera Species delimitation GMYC model |
本文献已被 ScienceDirect 等数据库收录! |
|