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The influence of riparian shade on lowland stream water temperatures in southern England and their viability for brown trout

Broadmeadow, S.B., Jones, J.G., Langford, T.E.L., Shaw, P.J. and Nisbet, T.R. (2011) The influence of riparian shade on lowland stream water temperatures in southern England and their viability for brown trout River Research and Applications, 27, (2), pp. 226-237. (doi:10.1002/rra.1354).

Record type: Article

Abstract

Suitable thermal conditions in streams are necessary for fish and predictions of future climate changes infer that water temperatures may regularly exceed tolerable ranges for key species. Riparian woodland is considered as a possible management tool for moderating future thermal conditions in streams for the benefit of fish communities. The spatial and temporal variation of stream water temperature was therefore investigated over 3 years in lowland rivers in the New Forest (southern England) to establish the suitability of the thermal regime for fish in relation to riparian shade in a warm water system. Riparian shade was found to have a marked influence on stream water temperature, particularly in terms of moderating diel temperature variation and limiting the number of days per year that maximum temperatures exceeded published thermal thresholds for brown trout. Expansion of riparian woodland offers potential to prevent water temperature exceeding incipient lethal limits for brown trout and other fish species. A relatively low level of shade (20-40%) was found to be effective in keeping summer temperatures below the incipient lethal limit for brown trout, but ca. 80% shade generally prevented water temperatures exceeding the range reported for optimum growth of brown trout. Higher levels of shade are likely to be necessary to protect temperature-sensitive species from climate warming.

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More information

e-pub ahead of print date: 25 January 2010
Published date: February 2011
Keywords: brown trout, climate change, habitat management, riparian shade, water temperature
Organisations: Civil Engineering & the Environment

Identifiers

Local EPrints ID: 73833
URI: http://eprints.soton.ac.uk/id/eprint/73833
ISSN: 1535-1459
PURE UUID: ba8e4e9c-5aeb-4cfc-be27-7cad27c941b3

Catalogue record

Date deposited: 15 Mar 2010
Last modified: 18 Jul 2017 23:48

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Contributors

Author: S.B. Broadmeadow
Author: J.G. Jones
Author: T.E.L. Langford
Author: P.J. Shaw
Author: T.R. Nisbet

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