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2006

Biology Master’s Theses

Lipid index

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Fat Stores, Plumage Morphs, And Sex Of Migrant White-Throated Sparrows, Brendan J. Mccabe Aug 2006

Fat Stores, Plumage Morphs, And Sex Of Migrant White-Throated Sparrows, Brendan J. Mccabe

Biology Master’s Theses

Abstract - A between-season comparison of lipid stores carried by migrant White-throated

Sparrows, as determined by deuterium dilution and visible fat class.

I compared qualitative and quantitative measures of fat stores for 144 migrant White-throated

Sparrows (Zonotrichia albicolis) in fall and spring. Qualitative measures were visible fat classes and a morphometric index (100 * mass / wind chord). I calculated lipid index (fat mass/fat-free dry mass) for the quantitative measure of fat stores using the deuterium dilution technique. Spring migrants had significantly higher fat class (2.0 ± 0.1 vs. 1.0 ± 0.2), lipid index (1.06 ± 0.03 vs. 0 ...