Habitat structure determines resource use by zooplankton in temperate lakes
Habitat structure determines resource use by zooplankton in temperate lakes
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DOI：
10.1111/j.1461-0248.2011.01597.x
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发表时间：
2011-04-01
期刊：
影响因子：
8.8
通讯作者：
Ward, Eric J.
中科院分区：
文献类型：
--
作者：
Francis, Tessa B.;Schindler, Daniel E.;Ward, Eric J.
虽然陆地联系对水生生态系统的重要性得到了很好的认识，但水生消费者的陆地支持程度仍然存在争议。对陆地对湖泊浮游动物的贡献的估计忽略了一个关键的食物来源，即混合层以下产生的浮游植物。我们利用25个太平洋西北湖泊的碳、氮稳定同位素数据，评估了混合层、混合层以下的颗粒有机质(POM)和陆相碎屑对浮游动物的相对重要性。相对于支持深层初级生产力的混合层POM而言，湖泊中浮游动物和深层POM在13C中处于耗竭状态。贝叶斯稳定同位素混合模型估计，陆地碎屑对浮游动物产量的贡献为5%，并证实了湖泊光学和热性质的作用；在最清澈的湖泊中，深层POM占浮游动物产量的高达80%。这些结果表明，陆地对湖泊浮游动物生产的支持微不足道。
P>While the importance of terrestrial linkages to aquatic ecosystems is well appreciated, the degree of terrestrial support of aquatic consumers remains debated. Estimates of terrestrial contributions to lake zooplankton have omitted a key food source, phytoplankton produced below the mixed layer. We used carbon and nitrogen stable isotope data from 25 Pacific Northwest lakes to assess the relative importance of particulate organic matter (POM) from the mixed layer, below the mixed layer and terrestrial detritus to zooplankton. Zooplankton and deep POM were depleted in 13C relative to mixed layer POM in lakes that can support deep primary production. A Bayesian stable isotope mixing model estimated that terrestrial detritus contributed < 5% to zooplankton production, and confirms the role of lake optical and thermal properties; deep POM accounted for up to 80% of zooplankton production in the clearest lakes. These results suggest terrestrial support of lake zooplankton production is trivial.