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首页> 外文期刊>Limnology >Changes in periphyton abundance and community structure with the dispersal of a caddisfly grazer, Micrasema quadriloba
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Changes in periphyton abundance and community structure with the dispersal of a caddisfly grazer, Micrasema quadriloba

机译：圆须草放牧对虾的扩散，改变了围生植物的丰度和群落结构

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摘要

We examined the larval population densities and biomass of a caddisfly grazer, Micrasema quadriloba, and the abundance and community structures of periphyton at a segment scale (7.4 km with four study sites), along a second-to fourth-order Japanese mountain stream throughout the grazer’s life cycle. In the uppermost riffle of the study segment (site 1), periphyton abundance was kept at low levels when the larvae occurred. The larval distribution spread downstream as larvae developed from first instars in May to fifth instars in January. We performed multiple regression analyses to test the effects of environmental variables and larval biomass on periphyton abundance in both the riffle of site 1 and the study segment; the results revealed that the larval biomass was significantly negatively correlated with periphyton abundance similarly in both the riffle and the study segment. In addition, both the correlation and community analyses showed that the larval biomass was significantly negatively correlated to the relative abundance of large and/or filamentous microalgae, which appeared in the uppermost layer of the periphyton mat, and that larval biomass was significantly positively correlated to the relative abundance of small diatoms, which strongly adhered to the substrate. Thus, the present study implied that the grazing of M. quadriloba larvae would regulate the abundance of periphyton in a riffle and also regulate the abundance and community structure of periphyton at the segment scale with the expansion of their longitudinal distribution.
机译：我们在整个区域的第二至第四阶日本山区河流中，以分段规模（7.4公里，有四个研究地点）研究了一种食虫放牧zer（Micrasema quadriloba）的幼虫种群密度和生物量，以及附生生物的丰富度和群落结构。放牧者的生命周期。在研究部分的最上层浅滩（站点1），幼虫发生时，浮游植物的丰度保持在较低水平。随着幼虫从五月的第一龄幼虫发展到一月的第五龄幼虫，幼虫的分布向下游扩散。我们进行了多元回归分析，以测试环境变量和幼虫生物量对站点1的浅滩和研究区域的浮游植物丰富度的影响；结果表明，幼虫生物量与浅滩和研究环节中的围生植物丰度显着负相关。此外，相关性和群落分析均表明，幼虫生物量与大和/或丝状微藻的相对丰度显着负相关，后者出现在附生植物垫的最上层，而幼虫生物量与牢固附着在基材上的小硅藻的相对丰度。因此，目前的研究表明，放牧四线虫幼虫可以调节细壁上的附生植物的丰度，并且随着片段的纵向分布的扩大，还可以在节段尺度上调节附生植物的丰度和群落结构。

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  • 来源
    《Limnology》 |2007年第3期|219-226|共8页
  • 作者

    Izumi Katano; Hideyuki Doi; Akiko Houki; Yu Isobe; Tadashi Oishi;

  • 作者单位

    Graduate School of Humanities and Sciences Nara Women’s University Nara Japan;

    School of Aquatic and Fishery Sciences University of Washington Seattle WA USA;

    Graduate School of Humanities and Sciences Nara Women’s University Nara Japan;

    Nara Bunka Women’s College Yamatotakada Japan;

    Nara Saho College Nara Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Segment; Riffle; Distribution; Seasonal change; Life cycle;

    机译：细分;Riffle;分布;季节变化;生命周期;

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