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Conservation physiology v.2 no.1, 2014년, pp.cou001 -   

One fledgling or two in the endangered Carnaby's Cockatoo ( Calyptorhynchus latirostris ): a strategy for survival or legacy from a bygone era?

Saunders, Denis A.    (CSIRO Ecosystem Sciences, GPO Box 1700, Canberra, ACT 2601, Australia   ); Mawson, Peter R.    (Perth Zoo, 20 Labouchere Road, South Perth, WA 6151, Australia   ); Dawson, Rick    (Department of Parks and Wildlife, Locked Bag 104, Bentley DC, WA 6983, Australia  );
  • 초록  

    Carnaby's Cockatoo is an endangered cockatoo endemic to Southwestern Australia. It normally lays two eggs with a median interval between them of eight days, but usually only fledges one nestling. Older, more experienced females are capable of fledging both young under conditions when food is not limiting. This can result in an increase in annual fledgling production. Predicted changes in climate of SW Australia may have major adverse consequences on breeding in the species. Of the five species of black cockatoo in the genus Calyptorhynchus , those species with red tail bands (Red-tailed Black Cockatoo and Glossy Black Cockatoo) lay clutches of only one egg and those with white or yellow tail bands (Carnaby's Cockatoo, Baudin's Cockatoo and Yellow-tailed Black Cockatoo) usually lay clutches of two. The breeding of the endangered Carnaby's Cockatoo has been studied from 1969 to 2012 at a number of localities throughout its range in south-western Australia within a region largely cleared for agriculture. When raising nestlings the species feeds on seeds of native vegetation, and there was a strong but not significant negative relationship between nesting success and percentage loss of native vegetation within 6 and 12 km of nest hollows. There was a significant negative relationship between the health of nestlings and percentage loss of native vegetation around nest hollows. While the usual clutch size is two, average clutch size tended to be lower in areas where much native vegetation has been cleared. While both eggs hatch in 77% of two-egg clutches, the species normally fledges only one young. However, the species is capable of fledging both nestlings from a breeding attempt. Sets of siblings are usually the product of older, more experienced females nesting in areas where more native vegetation has been retained. The conservation implications of these findings are discussed in the light of predicted changes to the climate of south-western Australia.


  • 주제어

    Calyptorhynchus latirostris .   Carnaby's Cockatoo .   clutch size .   fledging success .   nestling health.  

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