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The hyporheic zone as an invertebrate refuge during a fine sediment disturbance event

Milner, V. S. ORCID: https://orcid.org/0000-0001-8027-3647, Jones, J. I. ORCID: https://orcid.org/0000-0002-7238-2509, Maddock, Ian ORCID: https://orcid.org/0000-0001-5072-8700 and Bunting, George (2022) The hyporheic zone as an invertebrate refuge during a fine sediment disturbance event. Ecohydrology. e2450. ISSN 1936-0592

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Abstract

Subsurface sediments offer an important refuge that support the survival and persistence of river invertebrates during adverse surface conditions. Access to refuges for invertebrates varies with differing hydrological and substrate characteristics, especially the proportion of fine sediment. This study examines whether substrate characteristics influence the use of the hyporheic zone as an invertebrate refuge during a fine sediment disturbance event. We used 12 outdoor stream mesocosms to examine the vertical migration of benthic and hyporheic invertebrates to fine sediment loading. Each mesocosm was filled with coarse or experimentally colmated sediments. After 69 days, a fine sediment pulse of three varying fine sediment concentrations was added to the stream mesocosms. Both before and after the fine sediment pulse, a distinct gradient in the abundance and richness of hyporheic invertebrates was apparent with depth. Hyporheic abundance and taxonomic richness decreased at 5 cm and increased at 18 cm during fine sediment loading, indicating vertical migration of invertebrates from the benthic to hyporheic zone. Our study provides support for the hyporheic zone as a refuge for benthic invertebrates during fine sediment disturbance events. We also found evidence that movement pathways within subsurface sediments were still accessible and permitted bidirectional migration of individuals between the benthic and hyporheic zone in the coarse and colmated sediments during fine sediment loading. Understanding how increased fine sediment deposition affects streambed porosity will be increasingly important with ongoing climate change and anthropogenic sedimentation.

Item Type: Article
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This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

Uncontrolled Discrete Keywords: biodiversity, sedimentation, colmation, stream mesocosms, vertical migration
Divisions: College of Health, Life and Environmental Sciences > School of Science and the Environment
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Copyright Info: © 2022 The Authors. Ecohydrology published by John Wiley & Sons Ltd.
SWORD Depositor: Prof. Pub Router
Depositing User: Prof. Pub Router
Date Deposited: 25 Jul 2022 14:42
Last Modified: 25 Jul 2022 14:42
URI: https://eprints.worc.ac.uk/id/eprint/12350

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