Spatial dynamics of beetles living on exposed riverine sediments in the upper River Severn : method development and preliminary results

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dc.contributor.author Bates, A.
dc.contributor.author Butcher, C. R.
dc.contributor.author Sadler, J. P.
dc.contributor.author Fowles, A. P.
dc.date.accessioned 2009-09-07T15:03:44Z
dc.date.available 2009-09-07T15:03:44Z
dc.date.issued 2004-11-08
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 . en
dc.identifier.other PURE: 117400
dc.identifier.other dspace: 2160/2952
dc.identifier.uri http://hdl.handle.net/2160/2952
dc.description Bates, A., Sadler, J. P., Fowles, A. P., Butcher, C. R. (2005). Spatial dynamics of beetles living on exposed riverine sediments in the upper River Severn; method development and preliminary results.   Aquatic Conservation: Marine and Freshwater Systems, 15, (2), 159-174. en
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
dc.format.extent 16 en
dc.language.iso eng
dc.relation.ispartof Aquatic Conservation: Marine and Freshwater Ecosystems en
dc.subject Bembidion atrocaeruleum en
dc.subject Bembidion decorum en
dc.subject Fleutiauxellus maritimus en
dc.subject mark–recapture en
dc.subject metapopulation en
dc.subject patchy population en
dc.title Spatial dynamics of beetles living on exposed riverine sediments in the upper River Severn : method development and preliminary results en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1002/aqc.642
dc.contributor.institution Aberystwyth University en
dc.contributor.institution Institute of Biological, Environmental and Rural Sciences en
dc.description.status Peer reviewed en


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