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Casey J Wagnon¹, Brandon T Bestelmeyer², Robert L Schooley¹

¹Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, Illinois, USA.

The Journal of animal ecology

|October 17, 2024

概括

干旱地区的灌木侵占改变了捕食者-猎物动态,改变了对形动物的捕食风险,而不仅仅是食物的可用性. 这影响了生态系统的稳定性,并加强了灌木的状态.

科学领域:

生态生态学生态生态学
环境科学环境科学
野生动物生物学野生动物生物学

背景情况:

环境变化影响了食用相互作用和食物网动态,影响了生态系统的稳定性.
将环境变化与自上而下的和自下而上的过程联系在一起的机制尚不清楚.
灌木的侵占是干旱地区生态系统的重大环境变化.

研究的目的:

为了研究灌木侵占如何影响干旱地捕食者-猎物系统的食物互动.
在环境变化下,评估有关自下而上,自上而下和社团内部相互作用的假设.
了解感知掠食风险在塑造这些相互作用中的作用.

主要方法:

利用了来自新墨西哥州奇华沙漠的7年的摄像头陷数据.
检查了一种捕食者-猎物系统:大猩猩,狐,子和棉尾.
在草原到灌木的梯度中采用结构方程建模,降水量可变.

主要成果:

形动物对灌木覆盖地区的降雨脉冲做出了反应,这表明了变化的自下而上的效应.
灌木覆盖影响了被认为的掠食风险,减少了灌木占主导地位的息地中的形动物的风险.
猎人狼限制了狐的空间使用,这种协会内部的互动受到灌木入侵的影响.

结论:

环境变化,就像灌木入侵一样,改变了除了传统的上下/自下而上的动态之外的食用相互作用.
感知到的掠食风险是环境变化影响食物网的一个关键机制.
这些发现对了解草食模式和干旱地区灌木的持久性有影响.

关键词:

奇华 ?? 沙漠奇华 ?? 沙漠猎犬捕食者猎犬捕食者在子内捕食.它的猎物是形动物 (lagomorph).这是一个充满恐惧的景观.灌木的侵占灌木的侵占结构方程建模结构方程建模热带相互作用的热带相互作用

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