Relations between invertebrate drift and flow velocity in sand-bed and riffle habitats and the limits imposed by substrate stability and benthic density

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dc.contributor.author Vericat, Damià
dc.contributor.author Batalla, Ramon J.
dc.contributor.author Gibbins, Chris N.
dc.date.accessioned 2011-05-27T10:52:51Z
dc.date.available 2011-05-27T10:52:51Z
dc.date.issued 2010-09
dc.identifier.citation Vericat , D , Batalla , R J & Gibbins , C N 2010 , ' Relations between invertebrate drift and flow velocity in sand-bed and riffle habitats and the limits imposed by substrate stability and benthic density ' Journal of the North American Benthological Society , vol 29 , no. 3 , pp. 945-958 . , 10.1899/09-096.1 en
dc.identifier.issn 1937-237X
dc.identifier.other PURE: 162077
dc.identifier.other dspace: 2160/6809
dc.identifier.uri http://hdl.handle.net/2160/6809
dc.description Gibbins, C. N., Vericat, D., Batalla, R. J. (2010). Relations between invertebrate drift and flow velocity in sand-bed and riffle habitats and the limits imposed by substrate stability and benthic density. Journal of the North American Benthological Society, 29(3), 945-958. Sponsorship: University of Lleida; University of Aberdeen en
dc.description.abstract Downstream drift of benthic invertebrates is one of the defining characteristics of lotic environments. We collected 90 drift samples from adjacent sand-bed and riffle sections in a Mediterranean river during low flow conditions. Our goal was to compare drift fluxes (densities and instantaneous drift) and model the drift response across the velocity gradient in each habitat. Velocity distributions did not differ significantly between the habitats, but bedload transport rates and suspended sediment concentrations were significantly higher in the sand-bed habitat, where substrate was finer and less stable than in the riffle habitat. Benthic invertebrate densities differed by an order of magnitude between the habitats, with low and relatively homogeneous densities in the sand-bed. However, mean drift density did not differ significantly between the habitats. Quantile regression indicated that the upper limits of the drift response across the velocity gradient differed between habitats. Sample values below these upper limits suggest that substrate stability and benthic density act to constrain drift in some locations. Instantaneous drift was much higher in the sand-bed than in the riffle habitat, with up to 42% of the benthos present in the drift at any given moment. The taxonomic composition of benthic and drift samples suggested that animals from the riffle contributed to drift in the sand-bed habitat. The high loss rates in the sand-bed habitat suggest a rapid turnover of animals, supported by invertebrates arriving from the upstream riffle. en
dc.format.extent 14 en
dc.language.iso eng
dc.relation.ispartof Journal of the North American Benthological Society en
dc.title Relations between invertebrate drift and flow velocity in sand-bed and riffle habitats and the limits imposed by substrate stability and benthic density en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1899/09-096.1
dc.contributor.institution Aberystwyth University en
dc.contributor.institution Centre for Catchment and Coastal Research en
dc.description.status Peer reviewed en


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