沿着捕食者的体型梯度进行猎物选择证实了不同基于特征的机制在食物网组织中的作用
Esteban Ortiz1, Rodrigo Ramos-Jiliberto2, Matías Arim1
1Departamento de Ecología y Gestión Ambiental-Centro Universitario Regional del Este, Universidad de la República, Maldonado, Uruguay.
PloS one
|October 5, 2023
概括
较大的捕食者消耗更多的多样化和更大的猎物,由能源需求,口腔限制和最佳食驱动. 这些因素相互作用,形成复杂的食物网,捕食者特征影响猎物选择和整体食物网结构.
科学领域:
- 生态生态学 生态生态学
- 食物网的动态 食物网的动态
- 捕食者与猎物的相互作用
背景情况:
- 捕食者的体型影响了猎物的丰富性,大小和食物网中的食物位.
- 现有的理论包括能源需求,盖普限制和最佳食来解释这些趋势.
- 这些机制的相对重要性和综合效应仍未得到充分研究.
研究的目的:
- 通过特征选择 (CATS) 理论评估解释捕食者体型对猎物选择的影响的不同机制的支持.
- 调查猎物的体型和奖杯协会如何影响不同体型的捕食者对猎物的选择.
- 了解捕食者特征在塑造食物网组装中的机械基础.
主要方法:
- 利用特征选择 (CATS) 理论的社区集会来建模猎物选择模式.
- 在一个临时的池生态系统中,分析了鱼协会在一系列掠食者身体大小的范围内的猎物选择.
- 研究了猎物体型和奖杯协会对捕食者猎物选择的影响.
主要成果:
- 这项研究支持能源需求,口腔限制和最佳食机制的结合来解释食物网结构.
- 这些机制的强度取决于猎物的食物组.
- 较大的捕食者优先消耗高能量的猎物,而较小的捕食者则在所有食物营养水平上选择较小的猎物.
- 大型捕食者倾向于大规模的初级生产者,但由于消费风险,避免大型食肉动物猎物.
结论:
- 捕食者的体型,猎物特征和食物互动共同推动了食物网的组装.
- 了解这些特征介导的选择过程,为生态社区结构提供了机械的洞察力.
- 这些发现突显了食策略的上下文依赖性及其对食物网组织的影响.
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