Variation in Nesting Success of the American Robin, Turdus Migratorius

本文報告在愛荷華州立大學校園美國知更鳥的生殖生態。利用Mayfield方法，我們估計知更鳥在胚胎期的存活率是53.6%，在幼鳥期存活率是77.5%，而在整個築巢期（胚胎加上幼鳥期）是41.2%。幼鳥期的每日存活率在全部分析中皆高過胚胎期的存活率。大小鳥巢的每日存活率一樣，但建在屋簷下鳥巢的成功率（3.2%）明顯低於建在樹或灌叢的鳥巢（4.4%）。早期建在樹或灌叢的鳥巢的成功率（37.1%）明顯低於晚期的鳥巢（66.7%）。掠食是鳥蛋死亡的主要原因，而掠食及饑餓則是幼鳥死亡的主要原因。

關鍵字

鳥；生態； Mayfield方法

並列摘要

We studied breeding ecology of the American Robin (Turdus migratorius) on the campus of Iowa State University. We estimated nest success, as measured by the Mayfield method, to be 53.6% for the 13-day incubation interval, 77.5% for the 12-day nestling interval, and 41.2% for the entire nesting cycle. Daily survival rates did not differ between small and large clutches, but nests on buildings experienced a much lower success rate (3.2%) than nests placed in trees and shrubs (44.0%). Early season nests placed in trees and shrubs were less successful (37.1 %) than late season nests in trees and shrubs (66.7%) (p ＜ 0.05). Daily survival rates during the nestling period were consistently higher than during the incubation period in all analyses. Predation was the major cause of mortality for eggs, whereas predation and starvation were the major causes of mortality for nestlings.

並列關鍵字

Bird ； Ecology ； Mayfield method

國際替代計量

Variation in Nesting Success of the American Robin, Turdus Migratorius

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