Genetic diversity of soil invertebrates corroborates timing estimates for past collapses of the West Antarctic Ice Sheet

During austral summer field seasons between 1999 and 2018, we sampled at 91 locations throughout southern Victoria Land and along the Transantarctic Mountains for six species of endemic microarthropods (Collembola), covering a latitudinal range from 76.0°S to 87.3°S. We assembled individual mitochon...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2020-09, Vol.117 (36), p.22293-22302
Main Authors: Collins, Gemma E., Hogg, Ian D., Convey, Peter, Sancho, Leopoldo G., Cowan, Don A., Lyons, W. Berry, Adams, Byron J., Wall, Diana H., Green, T. G. Allan
Format: Article
Language:English
Subjects:
Biological Sciences
Climate
Climate change
Collembola
Cytochrome
Cytochrome-c oxidase
Cytochromes
Dispersal
Dispersion
Divergence
Endemic species
Estimates
Evolution
Flotation
Genetic diversity
Genetic structure
Global warming
Ice sheets
Mitochondria
Mountains
Physical Sciences
Polar environments
Population genetics
Soil invertebrates
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Summary:During austral summer field seasons between 1999 and 2018, we sampled at 91 locations throughout southern Victoria Land and along the Transantarctic Mountains for six species of endemic microarthropods (Collembola), covering a latitudinal range from 76.0°S to 87.3°S. We assembled individual mitochondrial cytochrome c oxidase subunit 1 (COI) sequences (n = 866) and found high levels of sequence divergence at both small (600 km) spatial scales for four of the six Collembola species. We applied molecular clock estimates and assessed genetic divergences relative to the timing of past glacial cycles, including collapses of the West Antarctic Ice Sheet (WAIS). We found that genetically distinct lineages within three species have likely been isolated for at least 5.54 My to 3.52 My, while the other three species diverged more recently (
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.2007925117