Hyporheic Invertebrates: The Clinal Nature of Interstitial Communities Structured by Hydrological Exchange and Environmental Gradients

Brunke, Matthias; Gonser, Tom

doi:10.2307/1468448

Cited by 84 publications

(76 citation statements)

References 35 publications

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“…Although the distribution of organic matter is often patchy, higher amounts of organic matter are typically found in downwelling sections of pool/riffle sequences (Pusch, 1996;Brunke & Gonser, 1999). VE cylinders subject to only vertical hydraulic exchange supported significantly greater abundances of the amphipod shredder G. pulex compared to the VHE cylinders at riffle heads.…”

Section: Discussionmentioning

confidence: 96%

“…Increases in fine sediment infiltration and deposition has the potential to reduce the porosity of the substratum, leading to a decline in vertical hydraulic flow and a reduction in the transport of organic matter, nutrients and dissolved oxygen (Bo et al, 2007;Simpson & Meixner, 2012). Substrate characteristics and hydraulic exchange have been identified as two of the most important factors driving interstitial invertebrate community composition (Brunke & Gonser, 1999;Mathers et al, 2014). Substrates characterised by high fine sediment loads are typically associated with limited hydraulic connectivity, reduced habitat quality and communities dominated by a limited pool of taxa which may feed on and/or burrow into the fine sediment deposits (Brunke, 1999;Descloux et al, 2013Descloux et al, , 2014.…”

Section: Introductionmentioning

confidence: 99%

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Fine sediment deposition and interstitial flow effects on macroinvertebrate community composition within riffle heads and tails

Mathers

Wood

2016

Hydrobiologia

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The distribution of macroinvertebrates in the heads and tails of riffles were examined in an in situ field experiment under stable baseflow conditions. Paired colonisation cylinders were used to examine the influence of vertical hydraulic exchange (upwelling and downwelling) and horizontal interstitial flow on the patterns of sedimentation and invertebrate colonisation. Sedimentation rates were greatest in cylinders permitting vertical and horizontal flow (VHE cylinders), and were significantly lower (29%) in cylinders where only vertical flow and ingress of fine sediment were possible (VE cylinders). The results demonstrate that horizontal interstitial flows represent an important pathway for fine sediment transport. Differences in fine sediment accumulation were also observed between riffle heads and tails. Significantly higher sedimentation rates were recorded in riffle tails, with the macroinvertebrate communities characterised by larger proportions of fine sediment tolerant taxa. In contrast, riffle head communities were characterised by greater proportions of sediment sensitive taxa, and in the case of VHE cylinders, shredders and EPT taxa. The results demonstrate that spatial differences in fine sediment deposition are evident at the riffle scale as a function of vertical and horizontal subsurface flows and that these factors play a key role in the distribution of macroinvertebrate fauna.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Fine sediment deposition and interstitial flow effects on macroinvertebrate community composition within riffle heads and tails

Mathers

Wood

2016

Hydrobiologia

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“…negative, positive, or no vertical flow, e.g. Anderson et al (2005), Tillman et al (2003) or Brunke and Gonser (1999). To complete these comments it is worth adding two elementary points: a positive or negative VHG does not imply a hydrologic connection-although it may be reasonable to assume so, neither does it discard the possible occurrence of an inverse hydraulic gradient between the sediment-water interface and the screen depth.…”

Section: Spatial Variability Of Fluxes Derived From Vhgs and Dilutionmentioning

confidence: 99%

Spatio‐temporal variations of hyporheic flow in a riffle‐step‐pool sequence

Käser

Binley

Heathwaite

et al. 2009

Hydrological Processes

108

136

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Subsurface flow in streambeds can vary at different scales in time and space. Recognizing this variability is critical for understanding biogeochemical and ecological processes associated with the hyporheic zone. The aim of this study was to examine the variability of hydraulic conductivity (K), vertical hydraulic gradients (VHGs), and subsurface fluxes, over a riffle-step-pool sequence and at a high spatio-temporal resolution. A 20 m reach was equipped with a network of piezometers in order to determine the distribution of VHGs and K. During a summer month, temporal variations of VHGs were regularly surveyed and, for a subset of piezometers, the water level was automatically recorded at 15 min intervals by logging pressure transducers. Additionally, point-dilution tests were carried out on the same subset of piezometers. Whereas the distribution of vertical fluxes can be derived from K and VHG values, point-dilution tests allow for the estimation of horizontal fluxes where no VHG is detectable. Results indicate that, spatially, VHGs switched from upwelling to downwelling across lateral as well as longitudinal sections of the channel. Vertical fluxes appeared spatially more homogeneous than VHGs, suggesting that the latter can be a poor indicator of the intensity of flow. Finally, during flow events, some VHGs showed little or no fluctuations; this was interpreted as the result of a pressure wave propagating from upstream through highly diffusive alluvial sediments.

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“…This pattern of fine sediment deposition (typically sand-and silt-sized fractions of B2 mm; Wentworth, 1922;Jones et al, 2012) directly influences the structure and composition of invertebrate communities (Brunke & Gonser, 1999) but also the nature of vertical hydrological exchange (Leek et al, 2009;Hartwig & Borchardt, 2015;Datry et al, 2015). Consequently, the dynamic pattern of vertical hydraulic exchange exerts a strong influence on physical and chemical conditions such as temperature, oxygen concentrations and the residence time of water (Olsen & Townsend, 2003;Krause et al, 2011b).…”

Section: Introductionmentioning

confidence: 99%

Benthic and hyporheic macroinvertebrate distribution within the heads and tails of riffles during baseflow conditions

2017

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The distribution of lotic fauna is widely acknowledged to be patchy reflecting the interaction between biotic and abiotic factors. In an in situ field study, the distribution of benthic and hyporheic invertebrates in the heads (downwelling) and tails (upwelling) of riffles were examined during stable baseflow conditions. Riffle heads were found to contain a greater proportion of interstitial fine sediment than riffle tails. Significant differences in the composition of benthic communities were associated with the amount of fine sediment. Riffle tail habitats supported a greater abundance and diversity of invertebrates sensitive to fine sediment such as EPT taxa. Shredder feeding taxa were more abundant in riffle heads suggesting greater availability of organic matter. In contrast, no significant differences in the hyporheic community were recorded between riffle heads and tails. We hypothesise that clogging of hyporheic interstices with fine sediments may have resulted in the homogenisation of the invertebrate community by limiting faunal movement into the hyporheic zone at both the riffle heads and tails. The results suggest that vertical hydrological exchange significantly influences the distribution of fine sediment and macroinvertebrate communities at the riffle scale.

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Hyporheic Invertebrates: The Clinal Nature of Interstitial Communities Structured by Hydrological Exchange and Environmental Gradients

Cited by 84 publications

References 35 publications

Fine sediment deposition and interstitial flow effects on macroinvertebrate community composition within riffle heads and tails

Fine sediment deposition and interstitial flow effects on macroinvertebrate community composition within riffle heads and tails

Spatio‐temporal variations of hyporheic flow in a riffle‐step‐pool sequence

Benthic and hyporheic macroinvertebrate distribution within the heads and tails of riffles during baseflow conditions

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