Lack of avian predators is associated with behavioural plasticity in nest construction and height in an island songbird
Lack of avian predators is associated with behavioural plasticity in nest construction and height in an island songbird
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DOI：
10.1016/j.anbehav.2022.08.017
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发表时间：
2022-12
期刊：
影响因子：
2.5
通讯作者：
Sarah C. Hays;Rebecca Cheek;James C. Mouton;T. Sillett;C. Ghalambor
中科院分区：
文献类型：
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作者：
Sarah C. Hays;Rebecca Cheek;James C. Mouton;T. Sillett;C. Ghalambor
摘要圣卡塔利纳岛橙冠莺的筑巢行为各不相同。离地巢比地面巢更重，包含更多的树枝。个体雌性在不同的高度建造不同材料的巢。巢的高度，而不是巢的建造，与巢的成功有关。筑巢行为的可塑性可能允许莺使用一系列的巢址。橙冠莺，Leiothlypis celata sordida，在加州海峡群岛繁殖的鸟类在巢的结构和位置上表现出显著的变化，这与鸟类巢的结构和巢址选择是高度保守的特征的一般模式相比，提供了一个有趣的例外。我们研究了在人口和个人规模的巢建设，以测试是否在圣卡塔利纳岛莺改变他们的巢建设，以响应巢的高度。在种群水平上，莺既建造了较轻的、以草为主的地面巢，也建造了较重的、含有更多刚性材料和更少草的离地巢。成功筑巢的概率与巢高呈显著正相关。在个体水平上，我们发现相同的个体能够在同一季节内的筑巢尝试之间建立地面和离地面的巢。然而，巢建筑是高度可变的个体之间，并没有显着相关巢成功后，控制巢高。我们认为，这种观察到的行为可塑性巢建设和巢高是一个层次的反应，没有鸟类捕食者。鸟类捕食者的风险降低似乎允许莺使用各种巢穴，从而需要增加巢穴建造的灵活性。
HighlightsSanta Catalina Island orange-crowned warblers varied in nest construction behaviour.Off-ground nests were heavier and contained more twigs than ground nests.Individual females built nests of different materials at different heights.Nest height, rather than nest construction, was associated with nest success.Plasticity in nesting behaviour may allow warblers to use a range of nest sites.Orange-crowned warblers, Leiothlypis celata sordida, breeding on the California Channel Islands exhibit remarkable variation in their nest structure and placement, providing an intriguing exception to the general pattern that avian nest structure and nest site selection are highly conserved characters. We examined nest construction at both the population and individual scale to test whether warblers on Santa Catalina Island change their nest construction in response to nest height. At the population level, warblers built both lighter, grass-dominated ground nests and heavier off-ground nests that contained more rigid materials and less grass. The probability of nest success was significantly and positively correlated with nest height. At the individual level, we found the same individuals were capable of building on-and off-ground nests between nesting attempts within the same season. However, nest construction was highly variable among individuals and not significantly correlated with nest success after controlling for nest height. We suggest this observed behavioural plasticity in nest construction and nest height is a hierarchical response to the absence of avian predators. Reduced risk from avian predators appears to allow the warblers to use a variety of nest sites, thereby necessitating increased flexibility in nest construction.