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Estimates of shorebird populations in North America

Occasional Paper 104

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Abstract

Estimates are presented for the population sizes of 53 species of Nearctic shorebirds occurring regularly in North America, plus four species that breed occasionally. Population estimates range from a few tens to several millions. Overall, population estimates most commonly fall in the range of hundreds of thousands, par-ticularly the low hundreds of thousands; estimated population sizes for large shorebird species currently all fall below 500 000. Population size is inversely related to size (mass) of the species, with a statistically significant negative regression between log(population size) and log(mass). Two outlying groups are evident on the regres-sion graph: one, with populations lower than predicted, includes species considered to be either a??at riska?? or par-ticularly hard to count, and a second, with populations higher than predicted, includes two species that are hunted. Shorebird population sizes were derived from data obtained by a variety of methods from breeding, migration, and wintering areas, and formal assessments of accuracy of counts or estimates are rarely available. Accurate estimates exist only for a few species that have been the subject of detailed investigation, and the likely accuracy of most estimates is considered poor or low. Population estimates are an integral part of conservation plans being developed for shorebirds in the United States and Canada and may be used to identify areas of key international and regional importance.

Additional Publication Details

Publication type:
Report
Publication Subtype:
Other Government Series
Title:
Estimates of shorebird populations in North America
Series title:
Occasional Paper
Series number:
104
Year Published:
2001
Language:
English
Publisher:
Canadian Wildlife Service
Publisher location:
Ottawa, Ontario, Canada
Contributing office(s):
Fort Collins Science Center
Description:
64 pp.
First page:
0
Last page:
64