Factors Influencing Survival of Black-chinned Hummingbird Nests in Southwest Colorado

Q4 Agricultural and Biological Sciences Western Birds Pub Date : 2024-03-15 DOI:10.21199/wb55.1.4
J. C. Ortega, C. P. Ortega
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Abstract

We estimated survival of Black-chinned Hummingbird (Archilochus alexandri) nests in southwest Colorado in 1998, 2001, and 2004 by means of models generated in program Mark. The best supported, and parsimonious, model suggested nest age (i.e., time since the nest was initiated) as the most important variable in indicating nest survival; daily survival rates of nests with eggs were lower than those of nests with nestlings. Substrate type was a second covariate that had some support in describing nest survival. Nests in Gambel oak (Quercus gambelii) or narrow-leaf cottonwood (Populus angustifolia) had greater daily survival rates than did those built in other substrates. No other ecological covariates were strongly supported in explaining nest survival. Of the 24 nests studied, 10 were successful, fledging an average of 1.7 (standard error 0.14) chicks.
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影响科罗拉多州西南部黑翅蜂鸟巢存活的因素
我们利用 Mark 程序生成的模型估算了 1998 年、2001 年和 2004 年科罗拉多西南部黑翅蜂鸟(Archilochus alexandri)巢的存活率。支持率最高且最合理的模型表明,巢龄(即筑巢以来的时间)是表明巢存活率的最重要变量;有卵的巢的日存活率低于有雏鸟的巢的日存活率。基质类型是第二个对巢穴存活率有一定支持作用的协变量。筑在甘伯栎(Quercus gambelii)或狭叶木棉(Populus angustifolia)上的巢的日存活率高于筑在其它基质上的巢。在解释巢的存活率方面,没有其他生态协变量得到强有力的支持。在研究的 24 个巢中,10 个成功,平均孵化出 1.7 只(标准误差 0.14)雏鸟。
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来源期刊
Western Birds
Western Birds Agricultural and Biological Sciences-Animal Science and Zoology
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