Show simple item record A. en_US C. R. en_US J. P. en_US A. P. en_US 2009-09-07T15:03:44Z 2009-09-07T15:03:44Z 2004-11-08 en_US
dc.identifier en_US
dc.identifier.citation Bates , A , Butcher , C R , Sadler , J P & Fowles , A P 2004 , ' Spatial dynamics of beetles living on exposed riverine sediments in the upper River Severn : method development and preliminary results ' Aquatic Conservation: Marine and Freshwater Ecosystems , vol 15 , no. 2 , pp. 159-174 . , 10.1002/aqc.642 en_US
dc.identifier.other PURE: 117400 en_US
dc.identifier.other dspace: 2160/2952 en_US
dc.description.abstract 1. Exposed riverine sediments (ERS) are habitats for a large number of rare and specialized invertebrates and, as such, are of considerable conservation importance. Actions that threaten ERS specialists operate on a variety of scales and include river engineering, flow regulation and livestock damage. Populations of specific species of ERS specialist beetles are likely to exhibit individual responses to these threats, depending on the spatial structure and dynamics of the population. An understanding of the spatial dynamics of ERS specialist beetles is, therefore, essential if conservation initiatives are to be successful. 2. A mark-recapture experiment was used to investigate the spatial dynamics of beetles on a section of the upper River Severn, mid-Wales, during June and August 2002. Two species of carabid, Bembidion atrocaeruleum Stephens and Bembidion decorum (Zenker), and one elaterid, Fleutiauxellus maritimus (Curtis), were individually marked and released on one of nine discrete patches of ERS demonstrating a range of patch size, sediment size, habitat heterogeneity, degree of shading, vegetation cover and grazing intensity. The methods used to trap, handle and individually mark beetles were all found to be suitable. 3. Population size of B. atrocaeruleum was mainly determined by ERS patch size, suggesting that, in contrast to F. maritimus, this species used all ERS microhabitats. 4. During the June study, 5.7% of marked and recaptured B. atrocaeruleum and 10% of marked and recaptured B. decorum actively moved between ERS patches over water or through thick vegetation in both upstream and downstream directions. Inter-patch movements of >65 m for B. atrocaeruleum and >135 m for B. decorum were detected. Movement rates in August were lower. F. maritimus showed no evidence of inter-patch movement. 5. The lower rate of dispersal and more specific habitat requirements are postulated as reasons for the greater rarity of F. maritimus. en_US
dc.format.extent 16 en_US
dc.relation.ispartof Aquatic Conservation: Marine and Freshwater Ecosystems en_US
dc.subject Bembidion atrocaeruleum en_US
dc.subject Bembidion decorum en_US
dc.subject Fleutiauxellus maritimus en_US
dc.subject mark–recapture en_US
dc.subject metapopulation en_US
dc.subject patchy population en_US
dc.title Spatial dynamics of beetles living on exposed riverine sediments in the upper River Severn en_US
dc.contributor.pbl Aberystwyth University en_US
dc.contributor.pbl Institute of Biological, Environmental and Rural Sciences en_US

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