Phylogeography of <Emphasis Type="Italic">Eupodes minutus</Emphasis> (Acari: Prostigmata) on sub-Antarctic Marion Island reflects the impact of historical events |
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Authors: | Elizabeth Mortimer Bettine Jansen van Vuuren |
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Institution: | (1) Evolutionary Genomics Group, Department of Botany and Zoology, University of Stellenbosch, Private Bag X1, Matieland, 7602, South Africa;(2) DST-NRF Centre of Excellence for Invasion Biology, Department of Botany and Zoology, University of Stellenbosch, Private Bag X1, Matieland, 7602, South Africa |
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Abstract: | Marion Island, situated ∼2,300 km south-east of Cape Town, South Africa, has experienced multiple volcanic and glaciation
events during its history. To better understand the impact of these events on species’ genetic structure, we determined the
phylogeographic population structure of the mite, Eupodes minutus. We included 57 individuals sampled from 11 localities across the island. Our analyses based on the mitochondrial COI gene
suggest a population expansion as would typically be expected when species recover after being confined to refugia. Standard
phi (Φ) statistics and a spatial analysis of molecular variance (SAMOVA) identified unique populations on the south-western
and south-eastern sides of the island. We argue that multiple volcanic events on the southern side of Marion, in combination
with glaciations, effectively isolated these populations from each other. |
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Keywords: | Southern Ocean COI Mites Population structure |
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