Metabolic rate, genetic and microclimate variation among springtail populations from sub-Antarctic Marion Island |
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Authors: | Angela McGaughran Peter Convey Mark I Stevens Steven L Chown |
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Institution: | (1) Allan Wilson Centre for Molecular Ecology and Evolution, Massey University, Private Bag 11-222, Palmerston North, New Zealand;(2) British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Rd, Cambridge, CB3 OET, UK;(3) South Australian Museum, PO Box 5000, Adelaide, Australia;(4) School of Biological Sciences, Flinders University, PO Box 5001, Adelaide, Australia;(5) Department of Botany and Zoology, Centre for Invasion Biology, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa |
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Abstract: | Measurement of metabolic rates (made at 10°C) of individuals of the springtail Cryptopygus antarcticus travei from six geographically distinct populations on sub-Antarctic Marion Island were combined with mitochondrial DNA (COI) haplotype
analysis to examine in parallel both physiological and genetic variation of distinct populations. We found evidence of genetic
differentiation among populations and a general indication of long-term isolation with limited gene flow. While we found support
for an overall pattern of metabolic rate structure among populations from different geographic locations on the island (mean
rate = 0.0009–0.0029 μl O2 μg−1 h−1 for populations of a mean individual mass of 8–26 μg), we were unable to demonstrate a coherent common pattern between this
and genetic variation. However, spatial structure in metabolic rate variation was strongly related to the extent of variability
in microclimate among sites, and also showed some indication of a phylogeographic signal. Thus, over the relatively short
timescale of Marion Island’s history (<1 million years), the periodic geographic barriers that have driven population differentiation
from a molecular perspective may also have resulted in some physiological differentiation of populations. |
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