Local- to continental-scale variation in the richness and composition of an aquatic food web
Local- to continental-scale variation in the richness and composition of an aquatic food web
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DOI：
10.1111/j.1466-8238.2010.00554.x
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发表时间：
2010-09-01
影响因子：
6.4
通讯作者：
Gotelli, Nicholas J.
中科院分区：
文献类型：
--
作者：
Buckley, Hannah L.;Miller, Thomas E.;Gotelli, Nicholas J.
目的研究北美紫色瓶子草（Sarraceniapurpurea，Sarraceniaceae）的水生食物网的物种丰富度和组成，从地方尺度到大陆尺度。purpurea -从北方佛罗里达纽芬兰和向西到东部的不列颠哥伦比亚省。MethodsEnvironmental predictors的物种组成和物种丰富度的变化进行了测量，在两个不同的空间尺度：在网站和网站之间的投手。层次贝叶斯模型被用来检查相关性和相似性的物种丰富度和丰度内和sites. Results 92类群的节肢动物，原生动物和细菌被确定在780投手样品。在这个多营养级社区在广泛的地理范围内的宿主植物的物种组成的变化低于宿主植物种群内的猪笼草之间的变化。食物网丰富度和组成的变化与气候、孔隙水化学、猪笼草形态和叶龄有关。五种最常见的无脊椎动物丰度的变化也与猪笼草形态和特定地点的气候和其他环境variables.Main conclusionsThe令人惊讶的结果是，这些社区在其宿主植物种群中比整个北美更易变，这表明在S. purpurea叶由两组物种组成：（1）核心组，主要是专性猪笼草-植物居民，其已经进化出对宿主植物的强烈需求，并且在整个北美一致地共同出现，和（2）更大的一组相对不常见的、多功能的分类群，其斑块地共同出现。
AimWe investigated patterns of species richness and composition of the aquatic food web found in the liquid-filled leaves of the North American purple pitcher plant, Sarracenia purpurea (Sarraceniaceae), from local to continental scales.LocationWe sampled 20 pitcher-plant communities at each of 39 sites spanning the geographic range of S. purpurea - from northern Florida to Newfoundland and westward to eastern British Columbia.MethodsEnvironmental predictors of variation in species composition and species richness were measured at two different spatial scales: among pitchers within sites and among sites. Hierarchical Bayesian models were used to examine correlates and similarities of species richness and abundance within and among sites.ResultsNinety-two taxa of arthropods, protozoa and bacteria were identified in the 780 pitcher samples. The variation in the species composition of this multi-trophic level community across the broad geographic range of the host plant was lower than the variation among pitchers within host-plant populations. Variation among food webs in richness and composition was related to climate, pore-water chemistry, pitcher-plant morphology and leaf age. Variation in the abundance of the five most common invertebrates was also strongly related to pitcher morphology and site-specific climatic and other environmental variables.Main conclusionsThe surprising result that these communities are more variable within their host-plant populations than across North America suggests that the food web in S. purpurea leaves consists of two groups of species: (1) a core group of mostly obligate pitcher-plant residents that have evolved strong requirements for the host plant and that co-occur consistently across North America, and (2) a larger set of relatively uncommon, generalist taxa that co-occur patchily.