Thursday, November 21, 2019

The second census of Chatham Island shag and Pitt Island shag - are numbers declining?

TitleThe second census of Chatham Island shag and Pitt Island shag - are numbers declining?
Publication TypeJournal Article
Year of Publication2005
AuthorsBester, AJ, Charteris, M
JournalNotornis
Volume52
Issue1
Pagination6-10
Type of Articlepaper
Keywordscensus, Chatham Island shag, distribution, Leucocarbo onslowi, Pitt Island shag, population size, Strictocarbo featherstoni
Abstract

A census of Chatham Island shag (Leucocarbo onslowi) and Pitt Island shag (Strictocarbo featherstoni), both endemic to the Chatham Islands, New Zealand, was conducted during their 2003/04 breeding season. Totals of 271 pairs of Chatham Island shags and 547 pairs of Pitt Island shags were recorded. Compared with the only previous survey (in 1997/98), numbers of both species were significantly lower. This decline most likely reflects broad scale marine changes affecting the birds' food supply. Alternatively, it may suggest variability in the timing of breeding between seasons.

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