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Distribution of macroinvertebrate communities across surface and groundwater habitats in response to hydrological variability
journal contribution
posted on 2019-09-04, 14:37 authored by Jessica M Durkota, Paul WoodPaul Wood, Tim Johns, Julian R Thompson, Roger J FlowerMacroinvertebrate communities are strongly influenced by hydrological variability in surface waters. However, the response of these communities in corresponding groundwater-dependent habitats is not well understood. This study characterised the macroinvertebrate fauna and physicochemical characteristics of a chalk aquifer and its rivers in southern England. Over one year, samples were collected from five paired benthic-hyporheic sites located in perennial or temporary rivers, and a further seven phreatic sites in the surrounding aquifer. The study was preceded by a period of below average rainfall, providing an opportunity to assess the response of macro-invertebrate communities to unseasonal declines in river discharge and groundwater levels. Benthic, hyporheic and phreatic habitats each supported a distinct macroinvertebrate community, with the hyporheic habitat support- ing both epigean taxa and stygofauna. As discharge declined, the composition of these communities changed. In particular, the abundance of the epigean amphipod Gammarus pulex was higher in hyporheic than benthic habitats during periods of low river discharge, suggesting potential refuge-seeking behaviour. Similarly, fluctuations in the abundance and distribution of two stygofauna, Crangonyx subterraneus and Niphargus fontanus, coincided with marked changes in groundwater levels, suggesting that the contraction of available habitat and changes in connectivity also influenced the phreatic community. The variable distribution of macroinvertebrates between these habitats, especially in response to hydrological variability, suggests a dynamic connection between the river and its aquifer. This connection is an important consideration for the assessment and conservation management of both surface and groundwater communities and may help underpin integrated, catchment-based management, especially in river systems with temporary reaches.
Funding
Environment Agency
UCL Graduate School
UCL Department of Geography
History
School
- Social Sciences
Department
- Geography and Environment
Published in
Fundamental and Applied LimnologyVolume
193Issue
1Pages
79 - 92Publisher
SchweizerbartVersion
- AM (Accepted Manuscript)
Rights holder
© E. Schweizerbart'sche VerlagsbuchhandlungAcceptance date
2019-01-03Publication date
2019-04-09Copyright date
2019ISSN
1863-9135eISSN
2363-7110Language
- en
Depositor
Prof Paul WoodUsage metrics
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