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Bromeliads affect the interactions and composition of invertebrates on their support tree.
Oecologia ( IF 2.3 ) Pub Date : 2020-02-18 , DOI: 10.1007/s00442-020-04616-w
Pierre Rogy 1 , Edd Hammill 2 , M Alex Smith 3 , Beatrice Rost-Komiya 1 , Diane S Srivastava 1
Affiliation  

Individual species can have profound effects on ecological communities, but, in hyperdiverse systems, it can be challenging to determine the underlying ecological mechanisms. Simplifying species' responses by trophic level or functional group may be useful, but characterizing the trait structure of communities may be better related to niche processes. A largely overlooked trait in such community-level analyses is behaviour. In the Neotropics, epiphytic tank bromeliads (Bromeliaceae) harbour a distinct fauna of terrestrial invertebrates that is mainly composed of predators, such as ants and spiders. As these bromeliad-associated predators tend to forage on the bromeliads' support tree, they may influence the arboreal invertebrate fauna. We examined how, by increasing associated predator habitat, bromeliads may affect arboreal invertebrates. Specifically, we observed the trophic and functional group composition, and the behaviour and interspecific interactions of arboreal invertebrates in trees with and without bromeliads. Bromeliads modified the functional composition of arboreal invertebrates, but not the overall abundance of predators and herbivores. Bromeliads did not alter the overall behavioural profile of arboreal invertebrates, but did lead to more positive interactions in the day than at night, with a reverse pattern on trees without bromeliads. In particular, tending behaviours were influenced by bromeliad-associated predators. These results indicate that detailed examination of the functional affiliations and behaviour of organisms can reveal complex effects of habitat-forming species like bromeliads, even when total densities of trophic groups are insensitive.

中文翻译:

凤梨科动物会影响其支持树上无脊椎动物的相互作用和组成。

单个物种会对生态群落产生深远影响,但是在超多样性系统中,确定潜在的生态机制可能具有挑战性。通过营养级别或功能组简化物种的反应可能是有用的,但表征群落特征结构可能与生态位过程更好地相关。在这种社区级别的分析中,一个被忽视的特征就是行为。在新热带,附生的凤梨科(凤梨科)拥有独​​特的陆生无脊椎动物动物,主要由掠食者(如蚂蚁和蜘蛛)组成。由于这些与凤梨科动物相关的捕食者倾向于在凤梨科动物的支持树上觅食,因此它们可能会影响树栖无脊椎动物。我们研究了凤梨科动物如何通过增加相关的捕食者栖息地来影响树栖无脊椎动物。具体来说,我们观察了有和没有凤梨科的树木中营养和功能基团的组成,以及树栖无脊椎动物的行为和种间相互作用。凤梨科动物改良了无脊椎动物的功能组成,但并未改变捕食者和食草动物的全部数量。凤梨科没有改变树栖无脊椎动物的整体行为特征,但是与白天相比,白天引起的交互作用更大,而没有凤梨科的树则相反。特别地,抚育行为受到与凤梨科动物相关的掠食者的影响。这些结果表明,即使对营养群体的总密度不敏感,对生物的功能隶属关系和行为的详细检查也可以揭示栖息地形成物种(如凤梨科)的复杂影响。我们观察到有和没有凤梨科的树木中营养和功能基团的组成,以及树栖无脊椎动物的行为和种间相互作用。凤梨科动物改良了无脊椎动物的功能组成,但并未改变捕食者和食草动物的全部数量。凤梨科没有改变树栖无脊椎动物的整体行为特征,但是与白天相比,白天引起的交互作用更大,而没有凤梨科的树则相反。特别地,抚育行为受到与凤梨科动物相关的掠食者的影响。这些结果表明,即使对营养群体的总密度不敏感,对生物的功能隶属关系和行为的详细检查也可以揭示栖息地形成物种(如凤梨科)的复杂影响。我们观察到有和没有凤梨科的树木中营养和功能基团的组成,以及树栖无脊椎动物的行为和种间相互作用。凤梨科动物修饰了无脊椎动物的功能成分,但并未改变捕食者和食草动物的全部数量。凤梨科没有改变树栖无脊椎动物的整体行为特征,但是与白天相比,白天引起的交互作用更大,而没有凤梨科的树则相反。特别地,抚育行为受到与凤梨科动物相关的掠食者的影响。这些结果表明,即使对营养群体的总密度不敏感,对生物的功能隶属关系和行为的详细检查也可以揭示栖息地形成物种(如凤梨科)的复杂影响。
更新日期:2020-02-18
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