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首页> 外文期刊>Aquatic Sciences >Temporal patterns in macrograzer effects on epilithic algae and meiofauna: a comparative approach to test for single species and whole grazer community effects
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Temporal patterns in macrograzer effects on epilithic algae and meiofauna: a comparative approach to test for single species and whole grazer community effects

机译：大型放牧者对上层藻类和鱼类的影响的时间模式：测试单一物种和整个放牧者群落影响的比较方法

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摘要

Within the shallow littoral zones of lakes, periphyton is an essential component, representing an important source of primary production and a food resource for herbivores. Periphytic communities are abundantly inhabited by meiofaunal organisms, which are mostly dominated by nematodes. During the last 3 decades, consumer-resource interactions between herbivore con sumers and periphytic components (mainly algae) have been intensively studied. Although whole grazer commu nity and single species effects on periphyton are known from field and laboratory experiments, the importance of single, dominant grazer taxa in direct comparison to whole community impacts is unknown. To investigate the conti nuity of grazing effects of a single, dominant macrograzer (Theodoxus fluviatilis, Gastropoda, Prosobranchia) on epi lithic meiofauna and algae with respect to the whole grazer community, a temporally structured field experiment was carried out in Lake Erken (Sweden). Grazer impacts on periphytic algae and meiofauna were tested by controlling macrograzer access to littoral periphyton communities for 8 weeks in an exclosure/enclosure experimental design. Overall, the results showed macrograzer presence to have temporally constant, strongly negative effects on algal biomass as well as meiofaunal abundance and community composition. Moreover, T. fluviatilis alone accounted for up to 80% of the grazing effects, indicative of their ability to regulate periphytic communities in lakes. The present study yields new insights into the effects of a single grazer species and stressed temporal patterns of consumer resource interactions in freshwater lakes.
机译：在湖泊的浅水沿海地区，周生植物是必不可少的组成部分，代表着初级生产的重要来源和食草动物的食物资源。褐藻类生物大量栖息于周围生植物群落，其中主要是线虫。在过去的30年中，对草食动物的消费者与周围植物成分（主要是藻类）之间的消费者-资源相互作用进行了深入研究。尽管从田间和实验室实验中可以了解到整个放牧者群落和单一物种对附生植物的影响，但尚不知道单个占优势的放牧者分类群与整个社区影响的直接比较的重要性。为了调查整个掠食者群落中单一优势杂食动物（Theodoxus fluviatilis，Gastropoda，Prosobranchia）对表皮石斑鱼和藻类的放牧影响的连续性，在埃尔肯湖（瑞典）进行了时间结构化的田间试验。在排泄/围护实验设计中，通过控制大型放牧对沿海近缘植物群落的接触，持续8周，测试了Grazer对周围藻类和鱼类的影响。总体而言，结果表明，大型放牧者的存在对藻类生物量以及藻类丰度和群落组成具有时间上恒定的强烈负面影响。此外，仅T. fluviatilis占放牧效应的80％，这表明它们有能力调节湖泊中的植物群落。本研究对单一食草动物的影响产生了新见解，并强调了淡水湖泊中消费者资源相互作用的时间模式。

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