• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aquatic Sciences >Benthic and hyporheic invertebrate assemblages along a gradient of increasing streambed colmation by fine sediment
【24h】

Benthic and hyporheic invertebrate assemblages along a gradient of increasing streambed colmation by fine sediment

机译：底栖和流变型无脊椎动物组合沿着细颗粒沉积物增加河床准直的梯度

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Streambed colmation by fine sediment, e.g. the deposition, accumulation and storage of fines in the substrate, is a major environmental concern throughout the world. Nevertheless, the ecological effects of streambed colmation on both benthic and hyporheic invertebrate assemblages have rarely been considered simultaneously. We studied a continuum of a naturally increasing percentage of fine sediment in three temperate rivers and hypothesized that the increasing percentage of fine sediment would decrease both benthic and hyporheic invertebrate densities and diversities, and reduce the similarities between them. To test these hypotheses, we first compared heavily, moderately and lightly clogged reaches located in downwelling areas and sampled invertebrates in the benthic zone and at 3 different depths (10, 30 and 50 cm) in the hyporheic zone. Secondly, we modified the sediment grain size distribution experimentally by increasing the percentage of fine sediment and using artificial substrates. The increasing colmation halved the hyporheic taxonomic richness and reduced benthic and hyporheic densities to a third. Some taxa were found in both zones, mainly in high colmation (e.g. Baetidae) or low colmation contexts (e.g. Orthocladiinae, Cyclopoida and Harpacticoida). The dissimilarity between benthic and hyporheic fauna (only at -50 cm) was significantly higher in heavily clogged reaches than in moderately and lightly clogged ones, suggesting reduced vertical exchange of invertebrates or differential impacts between zones. The total abundance, taxonomic richness, percentage of EPT taxa and densities of most organisms observed using the artificial substrates decreased linearly with the increasing percentage of fine sediment in the experiment. Only the Ephemeroptera Caenis spp. and Heptageniidae disappeared above 30 and 50 % of fine sediment, respectively, suggesting that the response to increasing colmation are strongly taxon-specific. High amount of fine sediments within the substrate significantly decreased habitat quality for benthic and hyporheic invertebrates and thus limit the production of streams and their capacity to recover after disturbance. Moreover, the use of hyporheic invertebrates seems more relevant than benthic invertebrates to assess the effect of colmation and thus could be tested in future research as indicators.
机译：精细沉积物例如细粉在基材中的沉积，积累和储存是全世界关注的主要环境问题。然而，很少同时考虑到流底准直对底栖和低变无脊椎动物组合的生态影响。我们研究了三条温带河流中细沙自然增加百分比的连续性，并假设增加细沙百分比将降低底栖和下突无脊椎动物的密度和多样性，并减少它们之间的相似性。为了检验这些假设，我们首先比较了位于下流区的重度，中度和轻度堵塞区域，以及底栖地带和流变地带3种不同深度（10、30和50厘米）的无脊椎动物样本。其次，我们通过增加细泥沙的百分比和使用人工基质，通过实验修改了泥沙的粒度分布。排序的增加使流水分类的丰富度减少了一半，底栖和流水密度降低了三分之一。在这两个区域中都发现了一些分类单元，主要是在高归巢（例如Baetidae）或低归巢的环境中（例如正甲，纲足和Harpacticoida）。底栖动物区系和水生动物区系之间的差异（仅在-50 cm处）在严重阻塞的河段中明显高于中度和轻微阻塞的河段，表明无脊椎动物的垂直交换减少或区域之间的差异影响。使用人工基质观察到的大多数细菌的总丰度，分类学丰富度，EPT分类单元的百分比和大多数生物的密度随实验中细颗粒沉积物的百分比线性增加。只有星翅目Caenis spp。 H和H科的细小沉积物分别消失了30％和50％以上，这表明对归巢增加的反应强烈地依赖于分类群。基质中大量的细小沉积物大大降低了底栖和低变无脊椎动物的栖息地质量，从而限制了水流的产生及其在干扰后的恢复能力。此外，使用流变无脊椎动物比底栖无脊椎动物评估准直效果更相关，因此可以在将来的研究中作为指标进行测试。

著录项

  • 来源
    《Aquatic Sciences》 |2013年第4期|493-507|共15页
  • 作者

    Stephane Descloux; Thibault Datry; Pierre Marmonier;

  • 作者单位

    EDF, Hydro Engineering Centre, Savoie Technolac, 73373 Le Bourget du Lac, France,Cemagref, UR MALY, 69336 Lyon, France,Universite Lyon, Universite Lyon 1, UMR-CNRS 5023 Ecology of Natural and Anthropized Hydrosystem Laboratory, 43 Bd du 11 novembre 1918, 69622 Villeurbanne Cedex, France;

    Cemagref, UR MALY, 69336 Lyon, France;

    Universite Lyon, Universite Lyon 1, UMR-CNRS 5023 Ecology of Natural and Anthropized Hydrosystem Laboratory, 43 Bd du 11 novembre 1918, 69622 Villeurbanne Cedex, France;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Clogging; Invertebrates; Biodiversity; Threshold effect; Vertical migration;

    机译：堵塞;无脊椎动物;生物多样性;阈值效应;纵向迁移;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号