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Distribution and abundance patterns of the palila on Mauna Kea, Hawaii

Auk

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Abstract

Censuses of the known geographical range of the rare and endangered Palila were conducted in January (nonbreeding season) and September (breeding season) 1975. The habitat (mamane and naio forest of Mauna Kea, Hawaii) was divided into five major areas, with each analyzed for vegetational composition, phenology of the predominant tree species, and Palila density. Using a line transect census technique, we determined that: 1) the Palila occupied 5,560 ha, approximately 10% of its former range; 2) Palila populations were more restricted in the nonbreeding season, possibly reflecting their flocking tendency; 3) Palila densities were 38 birds per km2 i n the breedings easona nd 36 birdsp er km2 in the nonbreedinsge ason4;) Palila population movements were small, and apparently were correlated with patterns of food availability; and 5) all methods of analysis yielded a projected population of approximately 1,600 birds. These low numbers, coupled with its restricted range, make the Palila one of the most vulnerable endangered species.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Distribution and abundance patterns of the palila on Mauna Kea, Hawaii
Series title:
Auk
Volume
95
Issue:
3
Year Published:
1978
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
518-527
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Auk
First page:
518
Last page:
527
Number of Pages:
10