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Spatial variability in the hyporheic zone refugium of temporary streams

机译：临时河水流变带区的空间变异性

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摘要

A key ecological role hypothesized for the hyporheic zone is as a refugium that promotes survival of benthic invertebrates during adverse conditions in the surface stream. Many studies have investigated use of the hyporheic refugium during hydrological extremes (spates and streambed drying), and recent research has linked an increase in the abundance of benthic invertebrates within hyporheic sediments to increasing biotic interactions during flow recession in a temporary stream. This study examined spatial variability in the refugial capacity of the hyporheic zone in two groundwater-dominated streams in which flow permanence varied over small areas. Two non-insect taxa, Gammarus pulex and Polycelis spp. were common to both streams and were investigated in detail. Hydrological conditions in both streams comprised a four-month period of flow recession and low flows, accompanied by reductions in water depth and wetted width. Consequent declines in submerged benthic habitat availability were associated with increases in population densities of mobile benthic taxa, in particular G. pulex. The reduction in the spatial extent of the hyporheic zone was minimal, and this habitat was therefore a potential refugium from increasing biotic interactions in the benthic sediments. Concurrent increases in the hyporheic abundance and hyporheic proportion of a taxon's total (benthic + hyporheic) population were considered as evidence of active refugium use. Such evidence was species-specific and site-specific, with refugium use being observed only for G. pulex and at sites dominated by downwelling water. A conceptual model of spatial variability in the refugial capacity of the hyporheic zone during habitat contraction is presented, which highlights the potential importance of the direction of hydrologic exchange.
机译：假设该流失带的关键生态作用是作为避难所，该避难所在地表水流的不利条件下促进底栖无脊椎动物的生存。许多研究已经调查了在水文极端事件（潮汐和河床干燥）期间对次流性避难所的使用，并且最近的研究已将流变性沉积物中底栖无脊椎动物的丰度增加与暂时性河流退潮期间生物相互作用的增加联系起来。这项研究检查了在两个以地下水为主的河流中，流变区在小区域内的持久性变化的区域中，流变带的退潮能力的空间变异性。两种非昆虫类群，伽玛鲁斯粉虱和Polycelis spp。这两个流都通用，并进行了详细的研究。两条河流的水文条件包括四个月的流量下降和低流量，并伴有水深和湿宽度的减小。淹没底栖生境的可利用性的减少随之而来，与可移动底栖生物分类群，特别是古柏种的种群密度的增加有关。泄水带的空间范围的减小是最小的，因此该栖息地是底栖沉积物中生物相互作用增加的潜在避难所。同时流失的丰富度和流失的比例在总分类群的总（底栖+低流度）人口中被认为是活跃避难所的证据。这样的证据是特定物种和特定地点的，仅对G. pulex和在以井下水为主的地点观察到了避难所。提出了栖息地收缩过程中低变带区的退潮能力空间变异性的概念模型，这突出了水文交换方向的潜在重要性。

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  • 来源
    《Aquatic Sciences》 |2011年第4期|p.499-511|共13页
  • 作者

    R. Stubbington; P. J. Wood; I. Reid;

  • 作者单位

    School of Science and Technology, Nottingham Trent University, Clifton Campus, Nottingham, Nottinghamshire NG11 8NS, UK;

    Department of Geography, Loughborough University,Loughborough, Leicestershire LEI 1 3TU, UK;

    Department of Geography, Loughborough University,Loughborough, Leicestershire LEI 1 3TU, UK;

  • 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

    hyporheic refuge hypothesis; low flows; habitat contraction; hyporheos; benthos; gammarus;

    机译：假性避难所假说;低流量;栖息地收缩;hypoheos;底栖动物;γ;

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