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An evaluation of condition indices for birds

Journal of Wildlife Management

By:
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Abstract

A Lipid Index, the ratio of fat to fat-free dry weight, is proposed as a measure of fat stores in birds. The estimation of the index from field measurements of live birds is illustrated with data on the sandhill crane (Grus canadensis) and greater white-fronted goose (Anser albifrons). Of the various methods of assessing fat stores, lipid extraction is the most accurate but also the most involved. Water extraction is a simpler laboratory method that provides a good index to fat and can be calibrated to serve as an estimator. Body weight itself is often inadequate as a condition index, but scaling by morphological measurements can markedly improve its value.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
An evaluation of condition indices for birds
Series title:
Journal of Wildlife Management
Volume
49
Issue:
3
Year Published:
1985
Language:
English
Description:
p. 569-575
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
569
Last page:
575
Number of Pages:
6