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Highly skewed sex ratios in the critically endangered Taita thrush as revealed by CHD genes

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Abstract

The study of sex-ratio patterns in threatened bird species has yielded crucial information with regard to their conservation and management. In the case of sexually monomorphic species, i.e. species that cannot be sexed by their appearance, DNA-based sexing techniques are increasingly applied. We present data on the sexing of adult Taita thrushes, a critically endangered forest endemic from south-east Kenya. In addition to describing a morphometric trait that can be used to sex individuals directly upon capture, we comment on a remarkable skew in sex ratio that might have important consequences for the long-term survival of the species.

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References

  • Brooks, T., Lens, L., Barnes, J., Barnes, R., Kihuria, J.K. and Wilder, C. (in press) The conservation status of the forest birds of the Taita Hills, Kenya, Bird Conserv. Int.

  • Collar, N.J., Stattersfield, A.J. and Crosby, M.J. (1994) Birds to watch 2. The world list of threatened birds. Birdlife Conservation Series No. 4. Cambridge, UK: Birdlife International.

    Google Scholar 

  • Double, M. and Olsen, P. (1997) Simplified polymerase chain reaction (PCR)-based sexing assists conservation of an endangered owl, the Norfolk Island Boobook Ninox novaeseelandiae undulata. Bird Conserv. Int. 7, 283–6.

    Google Scholar 

  • Ellegren, H. (1996) First gene on the avian W chromosome (CHD) provides a tag for universal sexing of non-ratite birds. Proc. R. Soc. Lond. Ser. B 263, 1635–41.

    Google Scholar 

  • Ellegren, H. and Sheldon, B.C. (1997) New tools for sex identification and the study of sex allocation in birds. Trends Ecol. Evol. 12, 255–9.

    Google Scholar 

  • Gibbs, J.P and Faaborg, J. (1990) Estimating the viability of Ovenbirds and Kentucky Warbler populations in forest fragments. Conserv. Biol. 4, 193–6.

    Google Scholar 

  • Gilpin, M.E. (1987) Spatial structure and population vulnerability. In Viable populations for conservation (M.E. Soulé, ed.) pp. 125–39. Cambridge: Cambridge University Press.

    Google Scholar 

  • Gowaty, P.A. (1993) Differential dispersal, local resource competition, and sex ratio variation in birds. Am. Nat. 141, 263–80.

    Google Scholar 

  • Greenwood, P.J. (1980) Mating systems, philopatry and dispersal in birds and mammals. Anim. Behav. 28, 1140–62.

    Google Scholar 

  • Griffiths, R. and Tiwari, B. (1993) The isolation of molecular genetic markers for the identification of sex. Proc. Natl. Acad. Sci., USA 90, 8324–6.

    Google Scholar 

  • Griffiths, R. and Tiwari, B. (1995) Sex of the last wild Spix's macaw. Nature 375, 454.

    Google Scholar 

  • Griffiths, R., Daan, S. and Dijkstra, C. (1996) Sex identification in birds using two CHD genes. Proc. R. Soc. Lond. Ser. B 263, 1251–6.

    Google Scholar 

  • Komdeur, J., Daan, S., Tinbergen, J. and Mateman, C. (1997) Extreme adaptive modification in sex ratio of the Seychelles warbler's eggs. Nature 385, 522–5.

    Google Scholar 

  • Lande, R. (1988) Genetics and demography in biological conservation. Science 241, 1455–60.

    Google Scholar 

  • Nakamura, D., Tiersch, T. R., Douglass, M. and Chandler, R.W. (1990) Rapid identification of sex in birds by flow cytometry. Cytogenet. Cell Genet. 53, 201–5.

    Google Scholar 

  • Parsons, P.A. (1990) Fluctuating asymmetry: an epigenetic measure of stress. Biol. Rev. 65, 131–45.

    Google Scholar 

  • SAS Institute Inc. (1988) SAS/STAT IM User's Guide, Release 6.03 Edition. Cary, NC: SAS Institute Inc.

    Google Scholar 

  • Sugden, L.G. and Beyersbergen, G.W. (1986) Effect of density and concealment on American crow predation of simulated duck nests. J. Wildl. Manag. 50, 9–14.

    Google Scholar 

  • Svensson, L. (1992) Identification guide to European passerines. Stockholm: Naturhistoriska Riksmuseet.

    Google Scholar 

  • Zimmerman, D.A., Turner, D.A. and Pearson, D.J. (1996) Birds of Kenya and northern Tanzania. London, UK: Christopher Helm, A & C Black.

    Google Scholar 

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Lens, L., Galbusera, P., Brooks, T. et al. Highly skewed sex ratios in the critically endangered Taita thrush as revealed by CHD genes. Biodiversity and Conservation 7, 869–873 (1998). https://doi.org/10.1023/A:1008815606931

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  • DOI: https://doi.org/10.1023/A:1008815606931

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