| 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. |
| Genre: | Article |
| ProdID: | 1001568 |
| Citation Author: | Johnson, D. H.; Krapu, G. L.; Reinecke, K. J.; Jorde, D. G. |
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| Citation End Page: | 575 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Wildlife Management |
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| Citation Number Of Pages: | 6 |
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| Citation Phsyical Description: | p. 569-575 |
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| Citation Search Results Text: | An evaluation of condition indices for birds; 1985; Article; Journal; Journal of Wildlife Management; Johnson, D. H.; Krapu, G. L.; Reinecke, K. J.; Jorde, D. G. |
| Citation Start Page: | 569 |
| Citation Volume: | 49 |
| Citation Year: | 1985 |
| Type: | citation/reference |
| Text: | An evaluation of condition indices for birds; 1985; Article; Journal; Journal of Wildlife Management; Johnson, D. H.; Krapu, G. L.; Reinecke, K. J.; Jorde, D. G. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 1985 00:00 -0600 |
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