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Haplotype diversity in the Antarctic springtail Gressittacantha terranova at fine spatial scales - a Holocene twist to a Pliocene tale
Ist Teil von
Antarctic science, 2010-12, Vol.22 (6), p.766-773
Ort / Verlag
Cambridge: Cambridge University Press
Erscheinungsjahr
2010
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Abstract
The mitochondrial COI gene of the Antarctic springtail,
Gressittacantha terranova
, was sequenced across a polar coastal landscape at Terra Nova Bay, northern Victoria Land. Samples from two altitudinal transects in the foothills directly south of Campbell Glacier were compared with samples from Springtail Valley (northern foothills) as an external reference population. We found that mtDNA haplotypes clustered into two lineages (clades) with a mean sequence divergence of 10% (uncorrected distance). However, there was no phylogeographic structure found at this spatial (landscape) scale with haplotypes from both divergent clades found sympatric across most populations. At the landscape scale, the considerable genetic divergence revealed within
G. terranova
is around five times greater than any other continental Antarctic springtail examined to date. These data indicate a Pliocene divergence event in
G. terranova
around 4–5 million years ago. The unusual distributional profile of haplotypes - occurrence of multiple haplotypes at single sites and genetic contiguity between sites that are not physically contiguous - suggests a subsequent ‘reshuffling’ of haplotypes in the Holocene that has an ecological basis.