Abstract
Many captive stocks of economically or otherwise valuable species were established before the decline of the wild population. These stocks are potentially valuable sources of genetic variability, but their taxonomic identity and actual value is often uncertain. We studied the genetics of captive stocks of the threatened lesser white-fronted goose Anser erythropus maintained in Sweden and elsewhere in Europe. Analyses of mtDNA and nuclear microsatellite markers revealed that 36% of the individuals had a hybrid ancestry. Because the parental species are closely related it is unlikely that our analyses detected all hybrid individuals in the material. Because no ancestral polymorphism or introgression was observed in samples of wild populations, it is likely that the observed hybridisation has occurred in captivity. As a consequence of founder effect, drift and hybridisation, captive stocks were genetically differentiated from the wild populations of the lesser white-fronted goose. The high level of genetic diversity in the captive stocks is explained at least partially by hybridisation. The present captive stocks of the lesser white-fronted goose are considered unsuitable for further reintroduction, or supplementation: hybridisation has involved three species, the number of hybrids is high, and all the investigated captive stocks are similarly affected. The results highlight the potential shortcomings of using captive-bred individuals in supplementation and reintroduction projects, when the captive stocks have not been pedigreed and bred according to conservation principles.
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Acknowledgements
We thank Tomas Aarvak, Åke Andersson, Bart Ebbinge, Toni Eskelin, Jens Kristiansen, Kimmo Lahti, Gerard Müskens, P.-A. Ohlsson, Ingar J. Øien, Jari Peltomäki, Sami Timonen & Petteri Tolvanen for assistance with sampling, and Hannele Parkkinen & Kerstin Santesson for assistance in the lab. Honor C. Prentice is gratefully acknowledged for many discussions and support. We thank Tomas Aarvak, Åke Andersson, Juha Merilä and Honor C. Prentice for critical reading of the manuscript. This work was supported by grants from WWF Sweden, Swedish Environmental Protection Agency and Swedish Association for Hunting and Wildlife Management (HT, MR), Maj & Tor Nessling Foundation and Academy of Finland (MR), and the Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (HT, A-CA).
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Ruokonen, M., Andersson, AC. & Tegelström, H. Using historical captive stocks in conservation. The case of␣the␣lesser white-fronted goose. Conserv Genet 8, 197–207 (2007). https://doi.org/10.1007/s10592-006-9162-5
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DOI: https://doi.org/10.1007/s10592-006-9162-5