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

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posted on 15.04.2016, 10:23 by Kate Mathers, Paul WoodPaul Wood
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.

History

School

  • Social Sciences

Department

  • Geography and Environment

Published in

Hydrobiologia

Citation

MATHERS, K.L. and WOOD, P.J., 2016. Fine sediment deposition and interstitial flow effects on macroinvertebrate community composition within riffle heads and tails. Hydrobiologia, 776(1), pp. 147–160.

Publisher

Springer / © The Authors

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Publication date

2016

Notes

This is an Open Access article published by Springer and distributed under the terms of the Creative Commons Attribution Licence, https://creativecommons.org/licenses/by/4.0/

ISSN

0018-8158

eISSN

1573-5117

Language

en