Behavioural responses to mammalian grazing expose insect herbivores to elevated risk of avian predation

文献类型： 外文期刊

第一作者： Zhu, Yu

作者： Zhu, Yu;Ma, Quanhui;Zhu, Yu;Ma, Quanhui;Zhu, Yu;Jiang, Ming;Zou, Yuanchun;Zhu, Yu;Jiang, Ming;Zou, Yuanchun;Li, Xiaofei;Tu, Xiongbing;Zhong, Zhiwei;Risch, Anita C.;Wang, Zhaojun;Ma, Quanhui;Wang, Deli;Zhong, Zhiwei;Inbar, Moshe;Hawlena, Dror;Zhong, Zhiwei

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关键词： large herbivores; predator-prey interactions; predation risk; birds; grasshoppers; trophic cascades

期刊名称：PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES （ 影响因子：3.5； 五年影响因子：4.4 ）

ISSN： 0962-8452

年卷期： 2024 年 291 卷 2032 期

页码：

收录情况： SCI

摘要： Large mammalian herbivores (LMH) are important functional components and drivers of biodiversity and ecosystem functioning in grasslands. Yet their role in regulating food-web dynamics and trophic cascades remains poorly understood. In the temperate grasslands of northern China, we explored whether and how grazing domestic cattle (Bos taurus) alter the predator-prey interactions between a dominant grasshopper (Euchorthippus unicolor) and its avian predator the barn swallow (Hirundo rustica). Using two large manipulative field experiments, we found that in the presence of cattle, grasshoppers increased their jumping frequency threefold, swallows increased foraging visits to these fields sixfold, and grasshopper density was reduced by about 50%. By manipulatively controlling the grasshoppers' ability to jump, we showed that jumping enables grasshoppers to avoid being incidentally consumed or trampled by cattle. However, jumping behaviour increased their consumption rates by swallows 37-fold compared with grasshoppers that were unable to jump. Our findings illustrate how LMH can indirectly alter predator-prey interactions by affecting behaviour of avian predators and herbivorous insects. These non-plant-mediated effects of LMH may influence trophic interactions in other grazing ecosystems and shape community structure and dynamics. We highlight that convoluted multispecies interactions may better explain how LMH control food-web dynamics in grasslands.

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