Oecologia ( IF 2.7 ) Pub Date : 2021-08-09 , DOI: 10.1007/s00442-021-05011-9 Chaim J Lasmar 1 , Clarissa Rosa 2 , Antônio C M Queiroz 1 , Cássio A Nunes 3 , Mayara M G Imata 1 , Guilherme P Alves 1 , Gabriela B Nascimento 1 , Ludson N Ázara 4 , Letícia Vieira 5 , Júlio Louzada 6 , Rodrigo M Feitosa 7 , Antonio D Brescovit 8 , Marcelo Passamani 9 , Carla R Ribas 1
The diversity of endotherms and ectotherms may be differently affected by ambient temperature and net primary productivity (NPP). Additionally, little is known about how these drivers affect the diversity of guilds of different trophic levels. We assessed the relative role of temperature and NPP in multitrophic guilds of ectothermic (arthropods: ants, ground beetles, spiders, and harvestmen) and endothermic (large mammals) animals along a tropical elevational gradient. We sampled arthropods at eight elevation belts and large mammals at 14 elevation belts in Atlantic rainforest (ranging from 600 to 2450 m.a.s.l.) of Itatiaia National Park, Southeast Brazil. Overall arthropod species richness was more associated with temperature than overall large-mammal species richness, while the latter was more associated with NPP. When separated into trophic guilds, we found that the species richness associated with NPP increased across arthropod trophic levels from herbivores to predators. Conversely, although NPP influenced large-mammal herbivore species richness, its effects did not seem to accumulate across large-mammal trophic levels since the species richness of large-mammal omnivores was more associated with temperature and none of the variables we studied influenced large-mammal predators. We suggest that thermal physiological differences between ectotherms and endotherms are responsible for the way in which arthropods and large mammals interact with or are constrained by the environment. Furthermore, the inconsistency regarding the role of temperature and NPP on species richness across multitrophic guilds of ectotherms and endotherms could indicate that thermal physiological differences might also interfere with energy use and flux in the food web.
中文翻译:
温度和生产力明显影响沿热带海拔梯度的变温和吸热多营养类群的物种丰富度
吸热和变温的多样性可能受环境温度和净初级生产力 (NPP) 的不同影响。此外,人们对这些驱动因素如何影响不同营养级别的公会多样性知之甚少。我们评估了温度和 NPP 在变温动物(节肢动物:蚂蚁、地甲虫、蜘蛛和收割者)和吸热(大型哺乳动物)动物沿热带海拔梯度的多营养类群中的相对作用。我们在巴西东南部 Itatiaia 国家公园的大西洋雨林(从 600 到 2450 masl)的 8 个海拔带上采集了节肢动物,在 14 个海拔带上采集了大型哺乳动物。整体节肢动物物种丰富度比整体大型哺乳动物物种丰富度与温度更相关,而后者与 NPP 更相关。当分成营养行会时,我们发现与 NPP 相关的物种丰富度在从食草动物到捕食者的节肢动物营养水平上增加。相反,虽然 NPP 影响了大型哺乳动物食草动物的物种丰富度,但它的影响似乎并没有在大型哺乳动物的营养水平上积累,因为大型哺乳动物杂食动物的物种丰富度与温度更相关,我们研究的变量都没有影响大型哺乳动物掠食者。我们认为,变温动物和吸热动物之间的热生理差异是造成节肢动物和大型哺乳动物与环境相互作用或受环境约束的原因。此外,