Nest structure affects auditory and visual detectability, but not predation risk, in a tropical songbird community
Nest structure affects auditory and visual detectability, but not predation risk, in a tropical songbird community
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在热带鸣禽群落中，巢穴结构会影响听觉和视觉的可探测性，但不会影响捕食风险
DOI：
10.1111/1365-2435.13405
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发表时间：
2019
影响因子：
5.2
通讯作者：
Galván, ed., Ismael
中科院分区：
文献类型：
--
作者：
Mouton, James C.;Martin, Thomas E.;Galván, ed., Ismael
具有关键人口和进化影响的物种之间的后代死亡率差异很大，但这种差异的原因仍不清楚。巢被广泛用于跨类群的繁殖，并被认为会影响后代的死亡风险。传统上，与开放式巢穴相比，更复杂、封闭的巢穴结构被认为可以通过降低巢穴内容物的可见性并抑制后代的声音来减少后代的捕食。缺乏对巢结构影响捕食风险的功能基础的直接测试。我们使用实验和 10 年的观测数据来研究巢结构如何影响不同热带鸣禽群落中的巢捕食风险。首先，我们研究了不同物种的巢穴大小与巢穴结构和巢穴捕食率的关系。其次，我们评估了巢结构如何影响雏鸟乞食在野外和实验室环境中的可检测性。最后，我们研究了不同巢穴结构的声学特性如何影响巢穴被捕食风险。具体来说，我们通过实验广播来自开放式和封闭式巢穴的乞讨叫声，以确定听觉线索和巢穴结构如何相互作用，从而影响对橡皮泥和鹌鹑蛋的捕食。我们还测试了巢穴结构是否与孵化（无乞讨线索）和雏鸟（乞讨线索）阶段之间的巢穴捕食率差异相关。我们发现，在考虑到成年体型后，封闭的巢穴比开放的巢穴更大，并且较大的巢穴会增加捕食率。此外，与开放的巢穴相比，封闭的巢穴并不能始终如一地改变雏鸟的乞食叫声，从而降低被捕食的可能性。事实上，在我们的回放实验中，乞讨线索增加了封闭式巢穴的捕食率，但没有增加封闭式巢穴的捕食率，而且孵化后封闭式巢穴的捕食率比开放式巢穴的增加更大。最终，与长期存在的理论相反，封闭式巢穴并不一定比开放式巢穴提供更大的捕食效益。可以在本文的支持信息中找到免费的简单语言摘要。
Offspring mortality varies dramatically among species with critical demographic and evolutionary ramifications, yet the causes of this variation remain unclear. Nests are widely used for breeding across taxa and thought to influence offspring mortality risk. Traditionally, more complex, enclosed nest structures are thought to reduce offspring predation by reducing the visibility of nest contents and muffling offspring sounds compared to open nests. Direct tests of the functional bases for nest structure influence on predation risk are lacking.We used experiments and 10 years of observational data to examine how nest structure influences nest predation risk in a diverse community of tropical songbirds. First, we examined how nest size was related to nest structure and nest predation rates across species. Second, we assessed how nest structure influences the detectability of nestling begging calls both in field and in laboratory settings. Finally, we examined how the acoustic properties of different nest structures influence nest predation risk. Specifically, we experimentally broadcast begging calls from open and enclosed nests to determine how auditory cues and nest structure interact to affect predation on plasticine and quail eggs. We also tested whether nest structure was associated with differences in nest predation rates between the incubation (no begging cues) and nestling (begging cues) stages.We found that enclosed nests are larger than open nests after accounting for adult size, and larger nests had increased predation rates. Moreover, enclosed nests did not consistently alter nestling begging calls in ways that reduce the likelihood of predation compared to open nests. Indeed, begging cues increased predation rates for enclosed but not open‐cup nests in our playback experiment, and nest predation rates showed greater increases after hatching in enclosed than open‐cup nests.Ultimately, enclosed nests do not necessarily provide greater predation benefits than open nests in contrast to long‐standing theory.A free plain language summary can be found within the Supporting Information of this article.
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DOI：
--
发表时间：
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期刊：
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影响因子：
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DOI：
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发表时间：
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影响因子：
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影响因子：
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