Latitudinal distribution and mitochondrial DNA (COI) variability of Stereotydeus spp. (Acari: Prostigmata) in Victoria Land and the central Transantarctic Mountains

We examined mitochondrial DNA (COI) variability and distribution of Stereotydeus spp. in Victoria Land and the Transantarctic Mountains, and constructed Neighbour Joining (NJ) and Maximum Likelihood (ML) phylogenetic trees using all publicly available COI sequences for the three Stereotydeus species...

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Bibliographic Details
Published in:Antarctic Science
Main Authors: Demetras, Nicholas J., Hogg, Ian D., Banks, Jonathan C., Adams, Byron J.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press 2010
Subjects:
Antarctica
Arthropoda
dispersal
environmental gradients
mites
Ross Dependency
Victoria Land
Transantarctic Mountains
Miers
Hallett
Beardmore
Beardmore Glacier
Cape Hallett
Miers Valley
Garwood
Darwin Glacier
Antarc*
Antarctic Science
Online Access:https://hdl.handle.net/10289/5094
https://doi.org/10.1017/S0954102010000659
Description
Summary:We examined mitochondrial DNA (COI) variability and distribution of Stereotydeus spp. in Victoria Land and the Transantarctic Mountains, and constructed Neighbour Joining (NJ) and Maximum Likelihood (ML) phylogenetic trees using all publicly available COI sequences for the three Stereotydeus species present (S. belli, S. mollis and S. shoupi). We also included new COI sequences from Miers, Marshall and Garwood valleys in southern Victoria Land (78°S), as well as from the Darwin (79°S) and Beardmore Glacier (83°S) regions. Both NJ and ML methods produced trees which were similar in topology differing only in the placement of the single available S. belli sequence from Cape Hallett (72°S) and a S. mollis haplotype from Miers Valley. Pairwise sequence divergences among species ranged from 9.5–18.1%. NJ and ML grouped S. shoupi from the Beardmore Glacier region as sister to those from the Darwin with pairwise divergences of 8%. These individuals formed a monophyletic clade with high bootstrap support basal to S. mollis and S. belli. Based on these new data, we suggest that the distributional range of S. shoupi extends northward to Darwin Glacier and that a barrier to dispersal for Stereotydeus, and possibly other arthropods, exists immediately to the north of this area.

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