Stoichiometry of actual vs. potential predator-prey interactions: insights into nitrogen limitation for arthropod predators
Stoichiometry of actual vs. potential predator-prey interactions: insights into nitrogen limitation for arthropod predators
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DOI：
10.1111/j.1461-0248.2004.00641.x
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发表时间：
2004-09-01
期刊：
影响因子：
8.8
通讯作者：
Denno, RF
中科院分区：
文献类型：
--
作者：
Fagan, WF;Denno, RF
文献汇编的数据集表明，陆地节肢动物之间的氮含量存在广泛的种间差异，并提高了捕食性物种限制氮(N)的可能性。然而，目前尚不清楚文献汇编中出现的氮供需之间的差距是否也存在于特定的生态群落中。为了解决这一不确定性，我们比较了节肢动物捕食者-猎物化学计量学来自汇编的数据库和来自斯巴达盐沼自然群落的化学计量学。对以草食动物为食的节肢动物捕食者和以行内捕食者为食的节肢动物分别进行了潜在的N限制评估。与汇编的数据库相比，盐沼消费者-资源的相互作用显示出食草动物的N含量与捕食者对N的需求之间的差距加大。与捕食性昆虫相比，盐沼蜘蛛类的含氮量较高，这可能是供需差距的原因之一。陆生节肢动物对N的限制是否在沼泽和自然界普遍存在，很大程度上取决于捕食性物种对N和C的总生长效率。获取这些效率参数的硬经验数据应该是一个研究目标。
Literature-compiled data sets demonstrate wide interspecific variation in nitrogen content among terrestrial arthropods and raise the possibility of nitrogen (N) limitation for predatory species. It remains unclear, however, whether the same disparities between N supply and demand that appear in literature compilations also exist in particular ecological communities. To address this uncertainty, we compared arthropod predator-prey stoichiometries derived from a compiled database with those from a natural Spartina saltmarsh community. Separate assessments of potential N-limitation were made for arthropod predators feeding on herbivores and for intraguild predators feeding on intraguild prey. Relative to the compiled database, saltmarsh consumer-resource interactions exhibited increased disparity between N-content of herbivores and N-demand by predators. The high N content of saltmarsh arachnids relative to predatory insects at large may contribute to the supply-demand disparity. Whether N-limitation of terrestrial arthropod predators is widespread in the marsh, and in nature in general, depends sensitively on the predatory species' gross growth efficiencies for N and carbon. Obtaining hard empirical data for these efficiency parameters should be a research goal.