Habitat and Microhabitat Features Associated with Cowbird Parasitism in Two Forest Edge Cowbird Hosts
Habitat and Microhabitat Features Associated with Cowbird Parasitism in Two Forest Edge Cowbird Hosts
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两种林缘牛鹂寄主与牛鹂寄生相关的栖息地和微生境特征
DOI：
10.2307/1370136
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
D. Burhans
中科院分区：
文献类型：
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作者：
D. Burhans
我研究了栖息地和巢的微生境功能的领域麻雀（Spizella pusilla）和靛蓝邦廷（Passerina cyanea）的褐头牛鹂（Molothrus ater）在密苏里州中部的育雏寄生的关系。在旧的领域的栖息地，靛蓝邦廷鸟更频繁地寄生比领域麻雀，但靛蓝邦廷鸟筑巢在森林栖息地寄生的频率高于邦廷鸟在旧领域。Logistic回归模型表明，巢隐蔽最好地解释了所有靛蓝邦廷和外地嵌套靛蓝邦廷寄生，隐蔽性差的巢更有可能被寄生。然而，侧隐藏是不相关的寄生严重寄生靛蓝？？微生境变量不能解释寄生在外地麻雀巢，但他们的巢较低，更好地隐藏比外地嵌套靛蓝班廷。结果表明，巢微生境的特点可能会影响寄生的概率，但物种和栖息地的特点可能会推翻微生境在解释寄生频率。
I examined the relationship of habitat and nest microhabitat features of Field Sparrows (Spizella pusilla) and Indigo Buntings (Passerina cyanea) to brood parasitism by the Brown-headed Cowbird (Molothrus ater) in central Missouri. In old field habitats, Indigo Buntings were more frequently parasitized than Field Sparrows, but Indigo Buntings nesting in forested habitat were parasitized at higher frequencies than buntings in old fields. Logistic regression models showed that nest concealment best explained parasitism for all Indigo Buntings and field-nesting Indigo Buntings, with poorly concealed nests more likely to be parasitized. However, side concealment was not related to parasitism for heavily-parasitized Indigo Buntings in forested habitats. Microhabitat variables did not explain parasitism at Field Sparrow nests, but their nests were lower and better concealed than field-nesting Indigo Buntings. Results suggest that nest microhabitat features may influence probability of parasitism, but species and habitat characteristics may override microhabitat in explaining frequency of parasitism.