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首页> 外文期刊>Ecology letters >Stoichiometry of nutrient recycling by vertebrates in a tropic stream: linking species identity and ecosystem processes
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Stoichiometry of nutrient recycling by vertebrates in a tropic stream: linking species identity and ecosystem processes

机译：脊椎动物在热带流中进行的营养物再循环的化学计量：将物种识别与生态系统过程联系起来

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摘要

Ecological stoichiometry offers a framework for predicting how animal species vary in recycling nutrients, thus providing a mechanism for how animal species identity mediates ecosystem processes. Here we show that variation in the rates and ratios at which 28 vertebrate species (fish, amphibians) recycled nitrogen (N) and phosphorus (P) in a tropical stream supports stoichiometry theory. Mass-specific P excretion rate varied 10-fold among taxa and was negatively related to animal body P content. In addition, the N : P ratio extracted was negatively related to body N : P. Body mass (negatively related to excretion rates) explained additional variance in these excretion parameters. Body P content and P excretion varied much more among taxonomic families than among species within families, suggesting that familial composition may strongly influence ecosystem-wide nutrient cycling. Interspecific variation in nutrient recycling, mediated by phylogenetic constraints on stoichiometry and allometry, illustrates a strong linkage between species identity and ecosystem function.
机译：生态化学计量学提供了一个框架，用于预测动物物种在循环利用营养中的变化，从而为动物物种身份如何介导生态系统过程提供一种机制。在这里，我们显示了热带流中28种脊椎动物（鱼类，两栖动物）回收的氮（N）和磷（P）的循环速率和比率的变化，支持化学计量理论。群体中特定质量P的排泄率变化10倍，与动物体内P含量呈负相关。此外，提取的N：P比例与身体N：P负相关。体重（与排泄率负相关）解释了这些排泄参数的其他差异。在分类学科中，人体P含量和P排泄量比家族中物种之间的差异大得多，这表明家族组成可能强烈影响整个生态系统的养分循环。通过化学计量和异速生长的系统发育限制介导的养分循环利用的种间差异说明物种同一性与生态系统功能之间的紧密联系。

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