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Trophic behavior of specialist predators from a macroecological approach: The case of the magellanic woodpecker in south American temperate forests
Global Ecology and Conservation ( IF 4 ) Pub Date : 2020-09-24 , DOI: 10.1016/j.gecco.2020.e01285
Alberto J. Alaniz , Mario A. Carvajal , Pablo M. Vergara , Andrés Fierro , Darío Moreira-Arce , Alejandro Rojas-Osorio , Gerardo E. Soto , Amanda D. Rodewald

Theoretical and empirical studies have addressed predator-prey relationships, but the relevance of individual prey species, prey species richness and environment on the niche and the distribution of specialist predators have been scarcely tested with a macroecological approach. Here we aim to analyze the niche and spatial distribution of the Magellanic woodpecker (MWP; Campephilus magellanicus), a specialist predator, analyzing the relative importance of its individual prey species, prey species richness and environmental factors. We modeled the niches of the MWP and its five most important long-horned beetle prey species, quantifying their similarity in spatial distribution and niche. Then we evaluated the relative importance of single prey species and prey species richness on the potential distribution of the MWP, which showed a high degree of overlap with the niche and spatial distribution of three prey species. MWP models with each of these three prey species had a better fit than the model with prey species richness, and contributed more than environmental variables. These results suggest that MWP responds to particular prey items rather than prey species richness. These findings highlight the usefulness of ecological niche models to identify behavioral traits, being potentially replicable in other types of interactions such as competition, mutualism, parasitism, and pollination.



中文翻译:

宏观生态学方法对专业捕食者的营养行为:南美温带森林麦哲伦啄木鸟的案例

理论和实证研究已经解决了捕食者与猎物之间的关系,但是单个捕食物种,猎物物种丰富度和环境与生态位和专业捕食者的分布之间的相关性几乎没有通过宏观生态学方法得到检验。在这里,我们旨在分析麦哲伦啄木鸟(MWP;Campephilus magellanicus)的生态位和空间分布。),一个专业的捕食者,分析其单个猎物种类,猎物种类丰富度和环境因素的相对重要性。我们对MWP及其五个最重要的长角甲虫猎物物种的生态位进行了建模,以量化它们在空间分布和生态位上的相似性。然后,我们评估了单个猎物物种和猎物物种丰富度对MWP潜在分布的相对重要性,这显示了与三种猎物物种的生态位和空间分布高度重叠。具有这三种猎物物种的MWP模型比具有猎物物种丰富度的MWP模型具有更好的拟合度,并且比环境变量贡献更大。这些结果表明,MWP是对特定猎物的反应,而不是对猎物物种丰富度的反应。

更新日期:2020-09-30
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