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

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 (Collemb...

Full description

Bibliographic Details
Published in:Genome
Main Authors: Beet, Clare R., Hogg, Ian D., Collins, Gemma E., Cowan, Don A., Wall, Diana H., Adams, Byron J.
Format: Article in Journal/Newspaper
Language:English
Published: NRC Research Press 2016
Subjects:
Antarcticinella monoculata
Biomonitoring
Climate change
Gomphiocephalus hodgsoni
Cryptopygus nivicolus
Biosurveillance
Changements climatiques
Antarctic
Ross Sea
Victoria Land
Mackay
Mackay Glacier
Antarc*
Antarctique*
Ice Sheet
Mer de Ross
ice covered areas
Springtail
Online Access:http://hdl.handle.net/2263/57077
https://doi.org/10.1139/gen-2015-0194
Description
Summary: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. 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 ...

Similar Items