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The distribution and numbers of Australasian crested grebe (kamana) in New Zealand, January 2004

TitleThe distribution and numbers of Australasian crested grebe (kamana) in New Zealand, January 2004
Publication TypeJournal Article
Year of Publication2005
AuthorsJensen, LA, Snoyink, RJ
JournalNotornis
Volume52
Issue1
Pagination34-42
Type of Articlepaper
Keywordscensus, conservation, crested grebe, New Zealand, Podiceps cristatus
Abstract

The Australasian crested grebe (kamana: Podiceps cristatus australis) is nationally endangered within New Zealand. A census, conducted on 24 January 2004 by 81 observers, recorded 300 adults and estimated a further 15 as present on 41 of the 93 lakes counted. Assuming approximately 30 grebes to be present on lakes not counted, the national population of adult crested grebes is estimated to be 340-350. This is 40% higher than the population recorded in 1980. In addition, 75 juveniles were counted on 18 lakes. As in the 1980 survey, approximately 55% of the adult crested grebes were recorded on Canterbury lakes. A significant regional change has occurred with birds now present on lakes in Otago, absent from Nelson lakes, and in reduced numbers in Marlborough, North Canterbury, Westland and Fiordland. In addition, a significant decline has occurred at Lake Alexandrina, one of the strongholds identifi ed in the 1980s. Forty percent of the present adult population was recorded on two lakes, Lake Heron and Lake Hayes. We identify priority sites where management to reverse declines could be implemented and we recommend a suite of management actions.

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