Functional responses of avian frugivores to variation in fruit resources between natural and fragmented forests
Functional responses of avian frugivores to variation in fruit resources between natural and fragmented forests
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鸟类食果动物对天然林和破碎林之间水果资源变化的功能反应
DOI：
10.1111/1365-2435.13255
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发表时间：
2019
影响因子：
5.2
通讯作者：
E. L. Neuschulz
中科院分区：
文献类型：
--
作者：
Quitián;V. Santillán;I. M. A. Bender;C. I. Espinosa;J. Homeier;K. Böhning-Gaese;M. Schleuning ;E. L. Neuschulz
在物种相互作用网络中，即果食性鸟类和果植物之间的伴侣选择在很大程度上取决于功能性状的匹配。然而，植物群落功能性状的组成随土地利用梯度而变化。了解灵活的消费者如何对资源性状组成的变化作出反应，对于预测生态系统功能（如种子传播）的后果至关重要。本文研究了不同海拔梯度的热带山地天然林和破碎森林中鸟类对不同性状水果的摄食能力。我们开发了一种新颖的、基于特征的方法来量化消费者在具有不同功能特征的资源之间的功能转移。我们预计，功能转变的程度与鸟类的食物选择相关的特征（如喙宽和果食程度）以及觅食行为（如翅膀形状和觅食层）有关。我们在3个海拔高度和2种栖息地类型（自然和破碎森林）中对植物-果食性网络进行了采样，并测量了每种植物和鸟类的功能特征。我们计算了各海拔高度植物群落的性状空间，并将相互作用的鸟类投影到其中。最后，我们计算了功能位移，即每种鸟类在两种栖息地类型中首选水果资源之间基于性状的距离。结果表明，在不同海拔高度，天然林和破碎林的结果植物群落功能性状空间存在差异。各海拔高度鸟类在生境类型之间的功能变化总体上大于零模型预测的变化。翅形是影响海拔梯度上功能转移的最重要性状，喙宽、果实化程度、觅食地层和系统发育不重要。我们得出结论，尖翅鸟类对果实资源性状组成的变化反应灵活，可能是由于这些物种的高流动性。我们的研究结果强调，将物种相互作用网络和功能性状分析联系起来，可以对消费物种如何响应生物因子的变化产生新的见解，并可以改善人类影响如何改变营养相互作用和相关生态系统功能的预测。本文提供了一个简单的语言摘要。
Partner choice in species interaction networks, that is, between frugivorous birds and fruiting plants, is largely determined by matching of functional traits. However, the composition of functional traits in plant communities changes along land‐use gradients. Understanding how flexible consumers react to changes in the trait composition of resources is crucial to project consequences for ecosystem functions, such as seed dispersal.We investigated the ability of birds to consume fruits with different sets of traits in natural and fragmented tropical montane forests across an elevational gradient. We developed a novel, trait‐based approach to quantify the functional shifts of consumers between resources with different functional traits. We expected the degree of functional shifts to be associated with bird traits related to food choice, such as bill width and degree of frugivory, as well as foraging behaviour, such as wing shape and foraging stratum.We sampled the plant–frugivore networks at three elevations and two habitat types (natural and fragmented forest) and measured the functional traits for each plant and bird species. We calculated the trait space of the plant community at each elevation and projected the interacting birds into it. Finally, we calculated the functional shift, which is the trait‐based distance between the preferred fruit resources in the two habitat types for each bird species.We found differences in the functional trait space of the fruiting plant community between natural and fragmented forests across all elevations. Birds' observed functional shifts between habitat types at each elevation were generally larger than the shifts expected by null models. Wing shape was the most important trait related to the functional shifts across the elevational gradient, whereas bill width, degree of frugivory, foraging stratum and phylogeny were not important.We conclude that birds with pointed wings respond flexibly to changes in the trait composition of fruit resources, probably due to the high mobility of these species. Our results emphasize that linking species interaction networks and functional trait analyses yield new insights into how consumer species respond to changes in biotic factors and can improve projections of how human impacts modify trophic interactions and associated ecosystem functions.A plain language summary is available for this article.
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DOI：
--
发表时间：
2013
期刊：
影响因子：
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作者：
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影响因子：
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作者：
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影响因子：
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影响因子：
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通讯作者：
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