Recent trends in numbers of Crozet shags breeding at the Prince Edward Islands

被引：4

作者：

Crawford, R. J. M. ^{[1
,2
]}

Ryan, P. G. ^{[3
]}

Dyer, B. M. ^{[1
]}

Upfold, L. ^{[1
]}

机构：

[1] Marine & Coastal Management, Dept Environm Affairs, ZA-8012 Cape Town, South Africa

[2] Univ Cape Town, Dept Zool, Anim Demog Unit, ZA-7701 Rondebosch, South Africa

[3] Univ Cape Town, Percy Fitzpatrick Inst, DST NRF Ctr Excellence, ZA-7701 Rondebosch, South Africa

来源：

AFRICAN JOURNAL OF MARINE SCIENCE | 2009年 / 31卷 / 03期

基金：

新加坡国家研究基金会;

关键词：

breeding success; Crozet shag; Phalacrocorax [atriceps] melanogenis; population trends; SURFACE-NESTING SEABIRDS; MARION ISLAND; PHALACROCORAX-ATRICEPS; POPULATION; PENGUINS; DIET;

D O I：

10.2989/AJMS.2009.31.3.15.1003

中图分类号：

Q17 [水生生物学];

学科分类号：

071004 ;

摘要：

Numbers of Crozet shags Phalacrocorax [atriceps] melanogenis breeding at Marion Island decreased by more than 70% from 840 pairs in 1994/1995 to 220 pairs in 2003/2004 and then increased to some 500 pairs in 2008/2009. The trends are thought to have been influenced by breeding success, which averaged 0.30 and 0.66 chicks per pair per year during 1998/1999-2002/2003 and 2003/2004-2008/2009 respectively. There were similar trends in numbers breeding and breeding success of gentoo penguins Pygoscelis papua, which at Marion Island have a similar diet to Crozet shags, suggesting that both species may have been influenced by food availability. Numbers of Crozet shags breeding at Prince Edward Island approximately doubled between the summers of 2001/2002 and 2008/2009. In 2008/2009, some 600 pairs of Crozet shags were breeding at the Prince Edward Islands.

引用

页码：427 / 430

页数：4

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