We investigated body and organ mass and carcass composition of twenty-
seven migrant Oldsquaws (Clangula hyemalis) killed when they collided
with power transmission lines in northeastern Ontario in October 1986.
Comparison of the first principal component (PC1) from eight structur
al measurements indicated that adult male Oldsquaws were structurally
larger than females; however, organ weights did not differ between sex
es when PC1 was included as a covariate (ANCOVA, P > 0.05 in all cases
). Carcass composition was similar to that reported for spring migrant
s. Ash-free lean dry weight (AFLDW) and ash were positively related to
structural size, but did not differ between sexes when PC1 was includ
ed as a covariate. Lipids comprised 17.5% of whole body mass of female
s and 14.1% of males and were sufficient to fuel migration at least to
the next likely staging area in the Great Lakes, Fall migrant Oldsqua
ws must have stored substantial lipid and protein reserves after breed
ing, suggesting that offshore feeding areas in James and Hudson Bay ar
e critical.