High interspecific variation in nutrient excretion within a guild of closely related caddisfly species
High interspecific variation in nutrient excretion within a guild of closely related caddisfly species
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DOI：
10.1002/ecs2.2205
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发表时间：
2018-05-01
期刊：
影响因子：
2.7
通讯作者：
Wissinger, Scott A.
中科院分区：
文献类型：
--
作者：
Balik, Jared A.;Taylor, Brad W.;Wissinger, Scott A.
了解行会内密切相关物种之间功能特征的变异量，对于了解群落组成和生态系统过程之间的联系至关重要。营养物质排泄是联系动物与环境的重要纽带，水生无脊椎动物群落通过排泄提供相当比例的生态系统养分需求。我们对栖息在高海拔池塘和湿地的10种幼虫的氮(N)和磷(P)排泄率进行了量化，以确定该协会内营养物质排泄的差异程度。我们发现，生物量比排泄量的氮(8倍差异)、磷(7倍差异)和化学计量比N：P比(5倍差异)存在显著的种间差异。通过荟萃分析，我们将该公会内的变异与其他科级物种组合中的变异进行了比较，以确定跨公会的营养排泄变异的总体范围，并确定该公会的变异是相对极端的、平均的还是较低的。Meta分析表明，不同组织间差异较大，其中N排泄量差异较大，P排泄量居中。我们的荟萃分析揭示了行业协会内部相当大的差异，这表明行业协会成员之间的功能冗余很难预测。因此，生物群体内的一些自然或人为造成的物种收益或损失，如行会和营养水平，可能对生态系统过程影响很小或没有影响，而其他物种可能会产生非常大的影响。
Understanding the amount of variation in functional traits between closely related species within guilds is critical for understanding links between community composition and ecosystem processes. Nutrient excretion is an important link between animals and their environments, and aquatic invertebrate communities can supply a considerable proportion of ecosystem nutrient demand via excretion. We quantified nitrogen (N) and phosphorus (P) excretion rates of 10 species of larval caddisflies that inhabit high-elevation ponds and wetlands to determine the magnitude of variation in nutrient excretion within this guild. We found considerable interspecific variation in biomass-specific excretion of nitrogen (eightfold differences), phosphorus (sevenfold differences), and the stoichiometric N:P ratios (fivefold differences). Through a meta-analysis, we compared the variation within this guild to the variation found in other family-level species assemblages to determine the overall range in the variation of nutrient excretion that could be expected across guilds and to determine whether the variation in this caddisfly guild is comparatively extreme, average, or low. The meta-analysis revealed a large range in variation among guilds, and comparatively, the variation within this caddisfly guild is high for N excretion and intermediate for P excretion. The considerable variation within guilds revealed by our meta-analysis suggests that functional redundancy among guild members is difficult to predict. Thus, some natural or human-caused species gains or losses within biological groupings such as guilds and trophic levels could have little or no effect on ecosystem processes, whereas others could have very large effects.