White et al (2019) - RRA Special Issue.pdf (1.52 MB)

How freshwater biomonitoring tools vary sub‐seasonally reflects temporary river flow regimes

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posted on 04.09.2019 by James C White, Patrick D Armitage, Jon AB Bass, Richard P Chadd, Matthew J Hill, Kate L Mathers, Sally Little, Paul Wood
Characterizing temporary river ecosystem responses to flow regimes is vital for conserving their biodiversity and the services they provide to society. However, freshwater biomonitoring tools rarely reflect community responses to hydrological variations or flow cessation events, and those available have not been widely tested within temporary rivers. This study examines two invertebrate biomonitoring tools characterizing community responses to different flow-related properties: the “Drought Effect of Habitat Loss on Invertebrates” (DEHLI) and “Lotic-invertebrate Index for Flow Evaluation” (LIFE), which, respectively reflect community responses to habitat and hydraulic properties associated with changing flow conditions. Sub-seasonal (monthly) variations of LIFE and DEHLI were explored within two groundwater-fed intermittent rivers, one dries sporadically (a flashy, karstic hydrology—River Lathkill) and the other dries seasonally (a highly buffered flow regime—South Winterbourne). Biomonitoring tools were highly sensitive to channel drying and also responded to reduced discharges in permanently flowing reaches. Biomonitoring tools captured ecological recovery patterns in the Lathkill following a supra-seasonal drought. Some unexpected results were observed in the South Winterbourne where LIFE and DEHLI indicated relatively high-flow conditions despite low discharges occurring during some summer months. This probably reflected macrophyte encroachment, which benefitted certain invertebrates (e.g., marginal-dwelling taxa) and highlights the importance of considering instream habitat conditions when interpreting flow regime influences on biomonitoring tools. Although LIFE and DEHLI were positively correlated, the latter responded more clearly to drying events, highlighting that communities respond strongly to the disconnection of instream habitats as flows recede. The results highlighted short-term ecological responses to hydrological variations and the value in adopting sub-seasonal sampling strategies within temporary rivers. Findings from this study indicate the importance of establishing flow response guilds which group taxa that respond comparably to flow cessation events. Such information could be adopted within biomonitoring practices to better characterize temporary river ecosystem responses to hydrological variations.

History

School

  • Social Sciences

Department

  • Geography and Environment

Published in

River Research and Applications

Volume

35

Issue

8

Pages

1325 - 1337

Publisher

Wiley

Version

AM (Accepted Manuscript)

Rights holder

© John Wiley & Sons, Ltd.

Publisher statement

This is the peer reviewed version of the following article: WHITE, J.C. ... et al, 2019. How freshwater biomonitoring tools vary sub‐seasonally reflects temporary river flow regimes. River Research and Applications, 35 (8), pp.1325-1337, which has been published in final form at https://doi.org/10.1002/rra.3501. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

Acceptance date

27/06/2019

Publication date

2019-08-08

Copyright date

2019

ISSN

1535-1459

eISSN

1535-1467

Language

en

Depositor

Prof Paul Wood

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