作者
Bradford S Keitt, Chris Wilcox, Bernie R Tershy, Donald A Croll, C Josh Donlan
发表日期
2002/8
期刊
Animal Conservation forum
卷号
5
期号
3
页码范围
217-223
出版商
Cambridge University Press
简介
Insular breeding seabirds are likely to be particularly vulnerable to introduced mammalian predators because they often lack behavioural, morphological and life-history defenses against predation. We studied the life-history of the black-vented shearwater (Puffinus opisthomelas) on Natividad Island, Baja California Sur, Mexico, to examine its vulnerability to introduced feral cats. Using an allometric equation, we estimated that feral cats consumed 328 g of food day-1 to satisfy their nutritional requirements. We used stable isotope analysis of cat scat to estimate that 90% of the cats' diet was composed of shearwaters. Using data from our focal species and from the closely related manx shearwater (Puffinus puffinus), we created a demographic model to evaluate the effects of cat population size on the annual growth rate (λ) of the shearwater. The annual growth rate for black-vented shearwaters was estimated to be 1 …
引用总数
学术搜索中的文章
BS Keitt, C Wilcox, BR Tershy, DA Croll, CJ Donlan - Animal Conservation forum, 2002