GROWTH AND CONDITION IN THE NORTHWEST ATLANTIC HARP SEAL
GROWTH AND CONDITION IN THE NORTHWEST ATLANTIC HARP SEAL
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DOI：
10.1139/f95-049
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发表时间：
1995-03-01
影响因子：
2.4
通讯作者：
SMITH, TG
中科院分区：
文献类型：
--
作者：
HAMMILL, MO;KINGSLEY, MCS;SMITH, TG
通过拟合渐近生长曲线，我们分析了1976-1979年收集的204只竖琴海豹样本和1988-1992年收集的437只动物样本的长度与年龄的关系。1988-1992年，雄性的渐近长度（170.4 cm）明显大于雌性（165.3 cm）。这种性别二态性在1976-1979年并不显著，因为雌性的拟合渐近长度每年变化很大，1976-1979年的样本很大。身体状况指数（总体重/体长（2.6））和体重对体长X腋窝围平方的回归构建的体积指数表明，1988-1992年收集的竖琴海豹的身体状况比1976-1979年收集的动物差。虽然这表明可用资源有所减少，但不能排除抽样偏差造成差异的可能性。
We analysed the relationship of length to age in a sample of 204 harp seals collected in 1976-1979 and of 437 animals collected in 1988-1992, by fitting asymptotic growth curves. The only significant variations were in asymptotic length, which for 1988-1992 was significantly larger for males (170.4 cm) than for females (165.3 cm). This sexual dimorphism was not significant in 1976-1979, because the fitted asymptotic length of females varied greatly from year to year, being large in the 1976-1979 samples. An index of body condition (total weight/length(2.6)) and a volume index constructed by regressing body weight on length X axillary girth squared indicated that harp seals collected in 1988-1992 were in poorer condition than animals collected during 1976-1979. Although this suggests a decline in available resources, the possibility of differences arising from sampling bias cannot be excluded.