考研英语阅读篇章: 遗传控制鸟类迁徙路径

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    考研英语阅读篇章: 遗传控制鸟类迁徙路径
    By tracking hybrids between songbird(鸣禽) species, investigators have found
that migration routes are under genetic control and could be preventing
interbreeding. The research, which is published in Ecology Letters, was
conducted using geolocators that, like GPS, record the position of a bird and
allow its long distance movement to be tracked. Compared with their parents,
hybrids exhibited increased variability in their migratory routes: some used
intermediate(中间的) routes across less suitable areas, while others used the same
routes as one parental group on fall migration and the other on spring
migration.
    "This is the first time we've been able to track songbirds over the entire
annual cycle, and the data we collected support a longstanding hypothesis in
ecological speciation, that differences in migratory behavior could be acting as
postmating reproductive isolating barriers," said lead author Kira Delmore.