Trophic structure of stream macroinvertebrate communities revealed by stable isotope analysis.
Trophic structure of stream macroinvertebrate communities revealed by stable isotope analysis.
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DOI：
10.2166/wst.2008.679
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发表时间：
2008-08
期刊：
影响因子：
--
通讯作者：
Kozo Watanabe;T. Omura
中科院分区：
文献类型：
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作者：
Kozo Watanabe;T. Omura
利用碳和氮稳定同位素分析（δ（13）C和δ（15）N）对日本广濑川主河道沿着3个纵向点和支流水库出口点的大型无脊椎动物群落的营养结构进行了研究。沿着这条主河道，原始食物供给逐渐由外来食物源向本地食物源转变。通过碳混合模型计算的大型无脊椎动物群落的本地起源百分比（=38-83%）随着悬浮细颗粒有机物（FPOM = 21-67%）的增加而增加，悬浮细颗粒有机物是主导群落的过滤收集器的主要资源。湖泊出口群落中的最低百分比的本地化（=21%）是由于外来粗颗粒有机物（例如，叶）在水库中过滤。捕食者有较高的平均δ（15）N比非捕食者在三个网站。从生产者到第一消费者，各营养级δ ~（15）N的平均富集率为3.82 ‰，从第一消费者到第二消费者为1.24 ‰。我们的数据表明稳定同位素分析的强大潜力，以提高我们的理解流大型无脊椎动物群落的营养结构。
The trophic structure of a macroinvertebrate community was investigated using carbon and nitrogen stable isotopes analysis (delta(13)C and delta(15)N) at three longitudinal sites along the main channel of the Hirose River, Japan, and at an outlet site of the tributary reservoir. Along the main channel, primal food supply gradually changed from allochthonous to autochthonous source. The percentage of autochthonous origin of the macroinvertebrate community calculated by a carbon-mixing model (=38-83%) increased with that of suspended fine particulate organic matter (FPOM = 21-67%), a main resource for filtering-collectors that dominated the communities. The lowest percentage of autochthonous in the lake outlet community (=21%) was a result of the notably low percentage autochthonous of FPOM due to the decomposition of allochthonous coarse particulate organic matter (e.g., leaf) strained in the reservoir. Predators had higher mean delta(15)N than non-predators in three sites. The average enrichments of delta(15)N signature per trophic level for all sites were 3.82 per thousand from producers to first consumers and 1.24 per thousand from first to second consumers. Our data suggest the strong potential for stable isotope analysis to enhance our understanding of the trophic structure of stream macroinvertebrate community.