Widespread Translocation from Autosomes to Sex Chromosomes Preserves Genetic Variability in an Endangered Lark |
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Authors: | M de L Brooke Justin A Welbergen Mark C Mainwaring Marco van der Velde A M F Harts Jan Komdeur William Amos |
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Institution: | (1) Department of Zoology, University of Cambridge, Downing Street, Cambridge, CB2 3EJ, UK;(2) Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK;(3) Animal Ecology Group, Centre for Ecological and Evolutionary Studies, University of Groningen, PO Box 14, 9750 AA Haren, The Netherlands |
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Abstract: | Species that pass repeatedly through narrow population bottlenecks (<100 individuals) are likely to have lost a large proportion
of their genetic variation. Having genotyped 92 Raso larks Alauda razae, a Critically Endangered single-island endemic whose world population in the Cape Verdes over the last 100 years has fluctuated
between about 15 and 130 pairs, we found variation at 7 of 21 microsatellite loci that successfully amplified, the remaining
loci being monomorphic. At 6 of the polymorphic loci variation was sex-linked, despite the fact that these microsatellites
were not sex-linked in the other passerine birds where they were developed. Comparative analysis strongly suggests that material
from several different autosomes has been recently transferred to the sex chromosomes in larks. Sex-linkage might plausibly
allow some level of heterozygosity to be maintained, even in the face of persistently small population sizes. |
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