Genetic diversity among populations of Antarctic springtails (Collembola) along the Mackay Glacier ecotone

Show simple item record Beet, Clare R. Hogg, Ian D. Collins, Gemma E. Cowan, Don A. Wall, Diana H. Adams, Byron J. 2016-10-03T12:14:13Z 2016-10-03T12:14:13Z 2016
dc.description This paper is part of a special issue entitled Barcodes to Biomes. en_ZA
dc.description.abstract Climate changes are likely to have major influences on the distribution and abundance of Antarctic terrestrial biota. To assess arthropod distribution and diversity within the Ross Sea region, we examined mitochondrial DNA (COI) sequences for three currently recognized species of springtail (Collembola) collected from sites in the vicinity, and to the north of, the Mackay Glacier (77°S). This area acts as a transition between two biogeographic regions (northern and southern Victoria Land). We found populations of highly divergent individuals (5%–11.3% intraspecific sequence divergence) for each of the three putative springtail species, suggesting the possibility of cryptic diversity. Based on molecular clock estimates, these divergent lineages are likely to have been isolated for 3–5 million years. It was during this time that the Western Antarctic Ice Sheet (WAIS) was likely to have completely collapsed, potentially facilitating springtail dispersal via rafting on running waters and open seaways. The reformation of the WAIS would have isolated newly established populations, with subsequent dispersal restricted by glaciers and ice-covered areas. Given the currently limited distributions for these genetically divergent populations, any future changes in species’ distributions can be easily tracked through the DNA barcoding of springtails from within the Mackay Glacier ecotone. en_ZA
dc.description.abstract Les changements climatiques antérieurs ont vraisemblablement eu des impacts importants sur la distribution et l’abondance du biota terrestre antarctique. Afin de mesurer la distribution et la diversité des arthropodes dans la région de la Mer de Ross, nous avons examiné les séquences mitochondriales (COI) chez trois espèces connues de collemboles récoltés a` proximité ou encore au nord du glacier Mackay (77°S). Cette région marque aussi la transition entre deux régions biogéographiques (régions septentrionale et méridionale de la terre de Victoria). Nous avons trouvé des populations constituées d’individus fortement divergents (5 % – 11,3 % de divergence nucléotidique intraspécifique) au sein des trois espèces de collemboles, ce qui suggère la possibilité d’une diversité cryptique. Sur la base d’horloges moléculaires, ces groupes divergents seraient isolés depuis 3 a` 5 millions d’années. C’est durant cette période que l’inlandis ouest-antarctique (WAIS, « Western Antarctic Ice Sheet ») se serait complètement effondré, ce qui aurait pu faciliter la dispersion des collemboles sur des radeaux de glace flottant sur des cours d’eau ou la mer. La reconstitution de la WAIS pourrait avoir ensuite isolé des populations nouvellement établies, la dispersion subséquente ayant été limitée par les glaciers et les zones couvertes de glace. Étant données les distributions présentement limitées des distributions de ces populations divergentes sur le plan génétique, tout futur changement dans la distribution de ces espèces de collemboles au sein de l’écotone du glacier Mackay pourra facilement faire l’objet d’un suivi par l’emploi de codes a` barres génétiques. [Traduit par la Rédaction] en_ZA
dc.description.department Genetics en_ZA
dc.description.librarian am2016 en_ZA
dc.description.sponsorship I.D.H. acknowledges Antarctica New Zealand for logistic support and the New Zealand Antarctic Research Institute (NZARI) for financial support. C.R.B. was the recipient of a New Zealand Post Antarctic Scholarship, a University of Waikato Environmental Research Institute Scholarship, and a Waikato Graduate Women Educational Trust Scholarship. Sequencing at the Canadian Centre for DNA Barcoding, University of Guelph, was supported through funding to the International Barcode of Life Project (iBOL) from the Ontario Genomics Institute (2008-OGI-ICI-03), Genome Canada, the Ontario Ministry of Research and Innovation, and the Natural Sciences and Engineering Research Council of Canada. B.J.A. and D.H.W. were supported by McMurdo LTER NSF OPP grant 1115245. D.A.C. gratefully acknowledges the financial support of the South African NRF SANAP program. en_ZA
dc.description.uri en_ZA
dc.identifier.citation Beet, CR, Hogg, ID, Collins, GE, Cowan, DA, Wall, DH & Adams, BJ 2016, 'Genetic diversity among populations of Antarctic springtails (Collembola) along the Mackay Glacier ecotone', Genome, vol. 59, pp. 762-770. en_ZA
dc.identifier.issn 0831-2796 (print)
dc.identifier.issn 1480-3321 (online)
dc.identifier.other 10.1139/gen-2015-0194
dc.language.iso en en_ZA
dc.publisher NRC Research Press en_ZA
dc.rights Copyright remains with the author(s) or their institution(s). This work is licensed under a Creative Commons Attribution 4.0 International License. en_ZA
dc.subject Antarcticinella monoculata en_ZA
dc.subject Biomonitoring en_ZA
dc.subject Climate change en_ZA
dc.subject Gomphiocephalus hodgsoni en_ZA
dc.subject Antarcticinella monoculata en_ZA
dc.subject Cryptopygus nivicolus en_ZA
dc.subject Biosurveillance en_ZA
dc.subject Changements climatiques en_ZA
dc.title Genetic diversity among populations of Antarctic springtails (Collembola) along the Mackay Glacier ecotone en_ZA
dc.type Article en_ZA

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