Abstract
We examined the fine scale distribution of the endemic Antarctic collembolan Gomphiocephalus hodgsoni in Taylor Valley, southern Victoria Land using the mitochondrial DNA cytochrome c oxidase I gene. We found an area of sympatry in the mid-region of the valley between two common haplotype groups (2.4% sequence divergence). The area of sympatry coincided with the extent of proglacial Lake Washburn (approx. 8,000 ya). This lake existed as a result of the damming of lower Taylor Valley by the grounding of the Ross Ice Sheet and may have acted as an isolating barrier to dispersal/gene flow. We suggest that the phylogenetic break occurring in the vicinity of the ancient shoreline may be the result of previous isolation of refugial allopatric populations, followed by recolonisation into a secondary contact zone during the Holocene.
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Acknowledgements
We are grateful to Allan Green, Dianne Gleeson and three anonymous reviewers for comments on the manuscript and to members of the K024 field party for their assistance and company in the field. Ray Cursons, Darin Sutherland and Barbara Holland provided helpful advice and/or assistance in the lab and Chris Hendy provided valuable information on the glacial history of southern Victoria Land. LN was supported through a Ministry of Education study award. We are also extremely grateful to Antarctica New Zealand (through support to IDH and TGA Green), and to Bryan Gould (University of Waikato Vice-Chancellor’s fund) for financial and/or logistic support. MS received financial support from the Australian Antarctic Division (through ASAC grants 2355 and 2397 to Paul Sunnucks), from David Penny, and NZ Foundation for Science and Technology Post-doctoral fellowship (MAUX0403).
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Nolan, L., Hogg, I.D., Stevens, M.I. et al. Fine scale distribution of mtDNA haplotypes for the springtail Gomphiocephalus hodgsoni (Collembola) corresponds to an ancient shoreline in Taylor Valley, continental Antarctica. Polar Biol 29, 813–819 (2006). https://doi.org/10.1007/s00300-006-0119-4
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DOI: https://doi.org/10.1007/s00300-006-0119-4