(Article of periodic en Anglais - 2014)

Document title

Invasive crayfish as drivers of fine sediment dynamics in rivers : field and laboratory evidence

Authors(s) and Affiliation(s)

HARVEY G.L. (1) ; HENSHAW A.J. (1) ; MOORHOUSE T.P. (2) ; CLIFFORD N.J. (3) ; HOLAH H. (4) ; GREY J. (4) ; MACDONALD D.W. (2) ;
(1) Queen Mary, School of Geography, Univ., London, ROYAUME-UNI
(2) Univ. of Oxford, Dept. of Zoology, The Recanati-Kaplan Centre, Tubney, ROYAUME-UNI
(3) King's College London, Geography, London, ROYAUME-UNI
(4) Queen Mary, Univ. of London, School of Biological and Chemical Sciences, London, ROYAUME-UNI


This study explores the impacts of invasive signal crayfish on suspended sediment dynamics at the patch scale through laboratory and field study. Three hypotheses are presented and tested : 1) that signal crayfish generate pulses of fine sediment mobilisation through burrowing and movement that are detectable in the flow field; 2) that such pulses may be more frequent during nocturnal periods when signal crayfish are known to be most active; and 3) that cumulatively the pulses would be sufficient to drive an overall increase in turbidity. Laboratory mesocosm experiments were used to explore crayfish impacts on suspended sediment concentrations for 2 treatments : clay banks and clay bed substrate. For the field study, high frequency near-bed and mid-flow turbidity time series from a lowland river with known high densities of signal crayfish were examined. The findings indicate that signal crayfish have the potential to influence suspended sediment yields, with implications for morphological change, physical habitat quality and the transfer of nutrients and contaminants


Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2014, vol. 39, no2 [pp. 259-271]

Bibliographic references : 2 p.

Collation : 11 fig.



INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3486

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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