Inbreeding and testicular abnormalities in a bottlenecked population of koalas (Phascolarctos cinereus)

Cristescu, Romane, Cahill, Valma, Sherwin, William B., Handasyde, Kathrine, Carlyon, Kris, Whisson, Desley, Herbert, Catherine A., Carlsson, Britt Louise J., Wilton, Alan N. and Cooper, Des W. 2009, Inbreeding and testicular abnormalities in a bottlenecked population of koalas (Phascolarctos cinereus), Wildlife research, vol. 36, no. 4, pp. 299-308, doi: 10.1071/WR08010.

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Title Inbreeding and testicular abnormalities in a bottlenecked population of koalas (Phascolarctos cinereus)
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Author(s) Cristescu, Romane
Cahill, Valma
Sherwin, William B.
Handasyde, Kathrine
Carlyon, Kris
Whisson, DesleyORCID iD for Whisson, Desley
Herbert, Catherine A.
Carlsson, Britt Louise J.
Wilton, Alan N.
Cooper, Des W.
Journal name Wildlife research
Volume number 36
Issue number 4
Start page 299
End page 308
Total pages 10
Publisher CSIRO Publishing
Place of publication Australia
Publication date 2009
ISSN 1035-3712
Summary Habitat destruction and fragmentation, interactions with introduced species or the relocation of animals to form new populations for conservation purposes may result in a multiplication of population bottlenecks. Examples are the translocations of koalas to French Island and its derivative Kangaroo Island population, with both populations established as insurance policies against koala extinction. In terms of population size, these conservation programs were success stories. However, the genetic story could be different. We conducted a genetic investigation of French and Kangaroo Island koalas by using 15 microsatellite markers, 11 of which are described here for the first time. The results confirm very low genetic diversity. French Island koalas have 3.8 alleles per locus and Kangaroo Island koalas 2.4. The present study found a 19% incidence of testicular abnormality in kangaroo Island animals. Internal relatedness, an individual inbreeding coefficient, was not significantly different in koalas with testicular abnormalities from that in other males, suggesting the condition is not related to recent inbreeding. It could instead result from an unfortunate selection of founder individuals carrying alleles for testicular abnormalities, followed by a subsequent increase in these alleles’ frequencies through genetic drift and small population-related inefficiency of selection. Given the low diversity and possible high prevalence of deleterious alleles, the genetic viability of the population remains uncertain, despite its exponential growth so far. This stands as a warning to other introductions for conservation reasons.
Language eng
DOI 10.1071/WR08010
Field of Research 060411 Population, Ecological and Evolutionary Genetics
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
HERDC collection year 2009
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