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动物 Lymnaea stagnalis 中的单个水平营养多样性。

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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 delta 13C and delta 15N 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.Digital Object Identifier http://dx.doi.org/10.1093/mollus/eyq020
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 Lymnaea stagnalis 以及同一生境中的主要消费者和生产者的个体水平营养特征。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同位素特征的巨大差异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相物种(幼虫天龙座的Chironomus plumosus ,ampampods, Gammarus lacustris ,浮游动物的 Ceraodaphnia > sp。和 Simocephalus vetulus )。此外,蜗牛之间的差异不能通过壳长或是否存在寄生虫感染来解释。微生境一级的生境异质性和资源可用性可能是决定单个食物来源的主要因素。数字对象标识符http://dx.doi.org/10.1093/mollus/eyq020

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