Vivid molecular divergence over volcanic remnants: the phylogeography of Megadromus guerinii on Banks Peninsula,New Zealand |
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Authors: | BH Wiseman ED Fountain MH Bowie S He |
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Affiliation: | 1. Centre for Wildlife Management and Conservation, Lincoln University, Lincoln, New Zealand;2. Department of Forest and Wildlife Ecology, University of Wisconsin, Madison, WI, USA;3. Department of Ecology, Lincoln University, Lincoln, New Zealand;4. Yunnan Agricultural University, Kunming, Yunnan, People’s Republic of China |
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Abstract: | Megadromus guerinii, an endemic carabid beetle (Carabidae), is the most common carabid throughout its restricted range on Banks Peninsula, a formation of extinct volcanoes in Canterbury, New Zealand. This study characterises the small-scale phylogeographic patterns of M. guerinii across the formerly volcanically active Banks Peninsula using mitochondrial and ribosomal genes. Between the eastern and western areas of the peninsula, the mitochondrial, but not nuclear, DNA has a well-defined geographic distribution. Specifically, mitochondrial cytochrome c oxidase subunit I (CO1) identifies two distinct groups (> 6% divergence between eastern and western beetles) while ribosomal genes show no discernible pattern. Whether such a pattern represents male-biased dispersal, Wolbachia infection, a recent range expansion of a divergent lineage, or a deeper historic separation is explored. There is potential that male-biased dispersal could have occurred. Wolbachia infection was not detected. We conclude that historical processes have likely separated taxa in the eastern and western peninsula. |
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Keywords: | Carabidae Coleoptera gene flow intraspecific variation mitochondrial-nuclear discordance male-biased dispersal Pterostichini |
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