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首页> 外文期刊>The Wilson Bulletin >AGE AND SEX DIFFERENCES IN THE TIMING OF SPRING MIGRATION OF HAWKS AND FALCONS
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AGE AND SEX DIFFERENCES IN THE TIMING OF SPRING MIGRATION OF HAWKS AND FALCONS

机译:鹰和粉丝春季迁徙时机的年龄和性别差异

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摘要

We trapped 994 hawks during spring migration in years between 1953 and 1972. We obtained sufficient numbers to comment on age or sex differences, or both, in the timing of migration of six species. Adults migrated earlier in most species, presumably because most adults but few juveniles breed. Adult male Sharp-shinned Hawks (Accipiter striatus) migrated significantly before adult females and the larger (presumably female) Red-tailed Hawks (Buteo jamaicensis) migrated significantly earlier than smaller individuals. Juvenile female Sharp-shinned Hawks and Cooper's Hawks (A. cooperii) migrated before males, probably because more juvenile females than males breed.
机译:在1953年至1972年之间的春季迁徙期间,我们共捕获了994头鹰。在六个物种迁徙的时间上,我们获得了足够的数量来评论年龄或性别差异,或两者都有。成年动物在大多数物种中的迁移较早,大概是因为大多数成年动物但很少有幼体繁殖。成年雄性尖齿鹰(Accipiter striatus)在成年雌性之前显着迁移,而较大的(可能是雌性)红尾鹰(Buteo jamaicensis)比较小的个体显着更早迁移。少年雌性尖锐的鹰和库珀的鹰(A. cooperii)在雄性之前迁移,这可能是因为少年雌性比雄性繁殖多。

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