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首页> 外文期刊>Journal of Field Ornithology >Eastern Wood-Pewees as Brown-headed Cowbird hosts: accepters but infrequently parasitized
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Eastern Wood-Pewees as Brown-headed Cowbird hosts: accepters but infrequently parasitized

机译：东部的木头人，作为棕头牛Cow的主人：接受者，但很少被寄生

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摘要

Brown-headed Cowbird (Molothrus ater) parasitism on pewees (Contopus spp.) is uncommon or rare in North America, suggesting that pewees sympatric with cowbirds either reject cowbird eggs or are not selected by cowbirds for parasitism, or that cowbirds are unable to parasitize pewee nests. At Delta Marsh, Manitoba, we inspected Eastern Wood-Pewee (C. virens) nests to determine parasitism frequency and experimentally parasitized pewee nests with real and artificial Brown-headed Cowbird eggs to assess their response to parasitism. No parasitism was recorded at 20 unmanipulated nests or at 12 experimentally parasitized nests, whereas all real and artificial cowbird eggs were accepted. The lack of observed parasitism, therefore, was not an artifact of cowbird egg rejection. We suggest the lack of parasitism on Eastern Wood-Pewees at Delta Marsh reflects a partial asynchrony between the parasite's and host's laying seasons and possibly the high placement of pewee nests. However, these factors may not explain the lack of parasitism at all other sites in North America or on other Contopus species.
机译：在北美，褐头牛Cow（Molothrus ater）寄生于寄生虫（Contopus spp。）很少见或罕见，这表明与牛bird同胞的美洲狮或拒绝牛bird卵或未被牛bird选为寄生虫，或者牛bird无法寄生矮人巢。在马尼托巴省的达美沼泽，我们检查了东部啄木鸟巢（C. virens）以确定寄生虫的发生频率，并通过实验将寄生的啄木鸟巢与真实的和人工的棕头牛bird蛋进行了寄生，以评估它们对寄生虫的反应。在20个未操纵的巢中或在12个实验性寄生的巢中未记录到寄生虫，而所有真实的和人工的牛bird卵均被接受。因此，没有观察到的寄生虫现象并不是牛卵排斥的产物。我们建议在三角洲沼泽的东部木-Pewees上没有寄生虫现象，这反映了寄生虫和寄主的产卵季节之间可能存在部分不同步，并且可能是矮蜂巢的高位。但是，这些因素可能无法解释北美所有其他场所或其他Contopus物种缺乏寄生虫的情况。

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