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Marrow, Heart and Body Fat as Indicators of Black Grouse Tetrao tetrix Condition

Tomas Willebrand and Vidar Marcström
Ornis Scandinavica (Scandinavian Journal of Ornithology)
Vol. 20, No. 1 (Mar., 1989), pp. 49-52
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3676707
Stable URL: http://www.jstor.org/stable/3676707
Page Count: 4
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Marrow, Heart and Body Fat as Indicators of Black Grouse Tetrao tetrix Condition
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Abstract

The content of marrow, heart and body fat was determined in 39 Black Grouse. Amounts of body fat varied between 4.0 g and 67.7 g. The highest values were found in breeding females (ovary fat was excluded). Amounts of marrow fat and heart fat were correlated with body fat, except marrow fat in breeding females. There was no evidence that malnutrition can be characterized by a critical amount of body fat. Black Grouse rapidly lost body weight when their food intake was reduced and it is suggested that they deal with sporadic food shortages, such as snowstorms and iceing of vegetation, by catabolizing muscle protein.

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