Tuesday, November 12, 2019

Breeding of brown teal ( Anas chlorotis ) at Okiwi, Great Barrier Island

TitleBreeding of brown teal ( Anas chlorotis ) at Okiwi, Great Barrier Island
Publication TypeJournal Article
Year of Publication2002
AuthorsBarker, D, Williams, M
JournalNotornis
Volume49
Issue4
Pagination199-208
Type of Articlepaper
KeywordsAnas chlorotis, breeding, brown teal, Great Barrier Island, New Zealand, productivity
Abstract

Breeding performance of brown teal (Anas chlorotis) nesting in a pastoral environment at Okiwi, Great Barrier Island, New Zealand was studied during 1997-99. Mean (SD) clutch size in 47 nests was 5.4 (0.9), eggs hatched in 74% of nests (n=50), and 66% of eggs (n=236) hatched. Of 31 females fitted with radio transmitters, the nesting attempt by 7 (23%) was not detected and the remainder fledged a total of 15 young, a mean (+SD) annual productivity of 0.5 (1.3) fledglings female-1. Most broods (72% n=32) became extinct within 10 days of hatching. Limited wetland habitat in the pastoral landscape concentrated nesting and brood rearing. Breeding statistics from this environment may not be representative of the wider population.

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