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Pepperweed: a growing threat to western wildlife habitat

People, Land, and Water

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Abstract

Counts on photographs and visual estimates of the numbers of territorial gulls are usually reliable indicators of the number of gull nests, but single visual estimates are not adequate to measure the number of nests in individual colonies. To properly interpret gull counts requires that several islands with known numbers of nests be photographed to establish the ratio of gulls to nests applicable for a given local census. Visual estimates are adequate to determine total breeding gull numbers by regions. Neither visual estimates nor photography will reliably detect annual changes of less than about 2.5 percent.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Pepperweed: a growing threat to western wildlife habitat
Series title:
People, Land, and Water
Issue:
July/August
Year Published:
2000
Language:
English
Contributing office(s):
Western Ecological Research Center
Description:
p. 27
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
27
Number of Pages:
27