Wednesday, November 20, 2019

Productivity and survival within 2 declining populations of brown teal ( Anas chlorotis )

TitleProductivity and survival within 2 declining populations of brown teal ( Anas chlorotis )
Publication TypeJournal Article
Year of Publication2001
AuthorsWilliams, M
JournalNotornis
Volume48
Issue4
Pagination187-195
Type of Articlepaper
KeywordsAnus chlorotis, breeding, brown teal, New Zealand, Northland, population, survival
Abstract

Brown teal (Anas chlorotis) populations at Clendon Cove and Tutaematai in Northland, New Zealand, declined catastrophically between 1993 and 1995, from 31 pairs to 1 and from 22 pairs to 8, respectively. Mean productivity was 1.8 fledglings pair1 in both populations. Fledgling survival was almost nil with only 1 of 51 identifiable fledglings surviving to recruit into 1 population. Almost all fledgling mortality occurred within 3 months of independence. Annual adult survival was 15% at Clendon Cove and 43% at Tutaematai and most deaths occurred in October-December, immediately after breeding. At Clendon Cove, significant mortality also occurred in autumn. Destruction of breeding and refuge habitat by cattle seeking moisture during periods of drought was identified as a significant cause of decline.

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