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首页> 外文期刊>Journal of Molluscan Studies >Stable isotopes indicate individual level trophic diversity in the freshwater gastropod Lymnaea stagnalis
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Stable isotopes indicate individual level trophic diversity in the freshwater gastropod Lymnaea stagnalis

机译：稳定的同位素表明淡水腹足纲幼虫的个体水平营养多样性

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摘要

In lacustrine ecosystems, benthic grazers are generally thought to feed on sediment detritus and microalgae, although there is a paucity of information on food resource use within populations. In this study, we investigated individual level trophic signatures for grazing snails, Lymnaea stagnalis, along with primary consumers and producers in the same habitat, using carbon and nitrogen stable-isotope analyses. In addition, we tested whether ontogeny and parasite presence influence food resource use. The large variation in δ13C and δ15N isotopic signatures indicated that individuals within a population feed on different food sources. Snails appear to have much greater individual variance in trophic behaviour than the other lacustrine species sampled (larval chironomid Chironomus plumosus, amphipods, Gammarus lacustris, zooplankton Ceriodaphnia sp. and Simocephalus vetulus). Moreover, variation among snails was not explained by shell length or the presence of parasitic infections. Habitat heterogeneity and resource availability at the microhabitat level may be the primary factors determining individual food sources.
机译：在湖泊生态系统中，人们普遍认为底栖放牧者以沉积物碎屑和微藻为食，尽管关于人口内部粮食资源利用的信息很少。在这项研究中，我们使用碳和氮稳定同位素分析调查了放牧蜗牛，阔叶麦草，同一生境中的主要消费者和生产者的个体营养级特征。此外，我们测试了个体发育和寄生虫的存在是否会影响食物资源的使用。 δ 13 C和δ 15 N同位素特征的巨大变化表明人群中的个体以不同的食物为食。蜗牛在营养行为上的个体差异似乎比其他采样的湖泊物种（幼虫Chironomid Chironomus plumosus，ampampods，Gammarus lacustris，浮游动物Ceriodaphnia sp。和Simocephalus vetulus）大得多。而且，蜗牛之间的差异不能通过壳长或寄生虫感染来解释。在微生境一级的生境异质性和资源可利用性可能是决定单个食物来源的主要因素。

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  • 来源
    《Journal of Molluscan Studies》 |2010年第4期|p.384-388|共5页
  • 作者

    Hideyuki Doi; Natalia I. Yurlova; Eisuke Kikuchi; Shuichi Shikano; Elena N. Yadrenkina; Svetlana N. Vodyanitskaya;

  • 作者单位

    Graduate School of Life Sciences, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, Japan|Present address: Institute for Chemistry and Biology of the Marine Environment, Carl-von-Ossietzky University Oldenburg, Schleusenstrasse 1, Wilhelmshaven 26382, Germany;

    Institute Systematic and Ecology of Animals, Siberian Branch of Russian Academy Sciences, Frunze St., 11, Novosibirsk 630091, Russia;

    Center for Northeast Asian Studies, Tohoku University, Kawauchi, Aoba-ku, Sendai 980-8576, Japan;

    Center for Northeast Asian Studies, Tohoku University, Kawauchi, Aoba-ku, Sendai 980-8576, Japan;

    Institute Systematic and Ecology of Animals, Siberian Branch of Russian Academy Sciences, Frunze St., 11, Novosibirsk 630091, Russia;

    Institute Systematic and Ecology of Animals, Siberian Branch of Russian Academy Sciences, Frunze St., 11, Novosibirsk 630091, Russia;

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