Translator Disclaimer
1 October 2000 A COMPARISON OF PHOTO COUNTS VERSUS VISUAL ESTIMATES FOR DETERMINING THE SIZE OF SNOW GOOSE FLOCKS
Author Affiliations +
Abstract

The purpose of this study was to compare two survey protocols for estimating the size of Snow Goose flocks in winter. Compared to photo counts of the same flocks, visual estimates were biased low when flock size exceeded 2000 birds, and the degree of this bias increased with flock size. Correction factors required for visual estimates of flocks with 2000–4000 birds and >4000 birds were approximately 1.4 and 1.6, respectively. These findings have implications for traditional, annual surveys conducted on even larger populations of Snow Geese in other parts of North America and for other more criptic species, such as ducks and shorebirds.

W. Sean Boyd "A COMPARISON OF PHOTO COUNTS VERSUS VISUAL ESTIMATES FOR DETERMINING THE SIZE OF SNOW GOOSE FLOCKS," Journal of Field Ornithology 71(4), 686-690, (1 October 2000). https://doi.org/10.1648/0273-8570-71.4.686
Received: 28 April 1999; Accepted: 1 October 1999; Published: 1 October 2000
JOURNAL ARTICLE
5 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top