Friday, March 24, 2017

Home range size and carrying capacity of the South Island takahe ( Porphyrio hochstetteri ) on Tiritiri Matangi Island

TitleHome range size and carrying capacity of the South Island takahe ( Porphyrio hochstetteri ) on Tiritiri Matangi Island
Publication TypeJournal Article
Year of Publication2003
AuthorsBaber, MJ, Craig, JL
JournalNotornis
Volume50
Issue2
Pagination67-74
Type of Articlepaper
Keywordsarrying capacity, home range, New Zealand offshore islands, Porphyrio hochstetteri, South Island takahe
Abstract

The South Island takahe (Porphyrio hochstetteri), an endangered flightless rail, has been released on 4 predator-free islands to reduce the risk of its extinction. To determine the ability of these islands to support takahe populations, we studied takahe home range size and carrying capacity on one of the islands. We plotted the location of 4 takahe family groups (13 individuals) from Nov 1994 to Oct 1995 on Tiritiri Matangi Island. Mean home range size (95% Minimum Convex Polygon) was 20.7 ha, and tended to be smaller when the proportion of suitable habitat within each home range was higher. We estimate that Tiritiri Matangi can support up to 8 breeding pairs, based on the availability of suitable habitat and estimated individual habitat requirements. However, this number is likely to change in the future depending on the influence of population density increases and successional habitat changes on takahe spatial requirements.

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