Habitat size determine algae biomass in tank-bromeliads
Habitat size determine algae biomass in tank-bromeliads
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DOI：
10.1007/s10750-011-0848-4
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发表时间：
2011-12-01
期刊：
影响因子：
2.6
通讯作者：
Farjalla, Vinicius F.
中科院分区：
文献类型：
--
作者：
Marino, Nicholas A. C.;Guariento, Rafael D.;Farjalla, Vinicius F.
本研究的主要目的是评价生境物理特性、自下而上因子和自上而下因子对池凤梨藻生物量的相对重要性及其相互作用。摘要通过对4个不同物种（绿毛毡毡、绿毛毡毡、褐毛毡毡和灰毛毡）64种槽凤梨类的调查，对藻类生物量（叶绿素-a浓度）、微后生动物密度、蚊虫丰度、营养物质浓度和生境物理结构特征等环境变量进行了采样。采用信息理论模型选择方法（Akaike信息准则）对凤梨属植物的完整和个体数据集进行了分析。在完整的数据集中，凤梨种类、最大水量和凤梨直径构成了确定叶绿素-a浓度的最佳模型。最大水量也构成了解释4个凤梨属物种数据集中3个物种叶绿素-a浓度的最佳模型。消费者与营养物质浓度之间的相互作用被纳入了随后的模型，但它们在统计上并不显著。综上所述，这些结果表明，栖息地大小对相关自养生物量的影响可能是通过改变群落对干扰，特别是干旱的敏感性来实现的。在这些自然环境中，生境大小对植物自养生物量的调节比资源可利用性或草食性更重要。
The primary goal of this study was to evaluate the relative importance of habitat physical properties, bottom-up and top-down factors, and their interaction on algae biomass in tank-bromeliads. We sampled algae biomass (chlorophyll-a concentration), micro-metazoan density, mosquito abundance, and several environmental variables, including nutrient concentrations and characteristics of the habitat physical structure, in a survey of 64 tank-bromeliads of four different species (Aechmea nudicaulis, Aechmea lingulata, Neoregelia cruenta, and Vriesea neoglutinosa). We analyzed the complete and individual bromeliad species datasets using an information-theoretic model selection approach (Akaike's information criterion). Bromeliad species, maximum water volume, and bromeliad diameter comprised the best model for determining chlorophyll-a concentrations for the complete dataset. The maximum water volume also comprised the best model to explain chlorophyll-a concentrations in three of four bromeliad species datasets. Interactions between consumers and nutrient concentration were included in the subsequent models, but they were not statistically significant. Taken together, these results demonstrate that the impact of habitat size on the associated autotrophic biomass occurs possibly via changes in community susceptibility to disturbances, particularly drought. We can conclude that habitat size is more important than resource availability or herbivory on phytotelm autotrophic biomass regulation in these natural microcosms.