7eee41f8-dbde-4b5e-b2d5-7296b5bfc558 English ISO/IEC 8859-1 (also known as Latin 1) dataset dataset NERC EDS Environmental Information Data Centre Lancaster Environment Centre, Library Avenue, Bailrigg Lancaster LA1 4AP UK info@eidc.ac.uk https://eidc.ac.uk/ EIDC website The Environmental Information Data Centre (EIDC) is the UK's national data centre for terrestrial and freshwater sciences. information pointOfContact 2025-11-13T16:18:02 UK GEMINI 2.3 OSGB 1936 / British National Grid Fish biomass and density data for 3 intensively studied Wessex chalkstream sites, England, UK 2017-06-26 publication 2013-10-31 creation https://catalogue.ceh.ac.uk/id/7eee41f8-dbde-4b5e-b2d5-7296b5bfc558 10.5285/7eee41f8-dbde-4b5e-b2d5-7296b5bfc558 doi: Jones, J.I., Arnold, A., Pretty, J., Duerdoth, C., Murphy, J., Hawczak, A., Scott, L., Lauridsen, R., Beaumont, W. (2017). Fish biomass and density data for 3 intensively studied Wessex chalkstream sites, England, UK. NERC Environmental Information Data Centre 10.5285/7eee41f8-dbde-4b5e-b2d5-7296b5bfc558 Density and biomass of fish taxa from three chalkstreams in the Wessex chalk area: Nine Mile River, River Till and River Wylye. Data were collected on five occasions, between October 2012 and October 2013. The density of fish taxa at each of the three streams was estimated using benthic fish sampling and multi-pass electrofishing. The mean biomass of individuals of each taxon at each site on each occasion was then applied to the density estimates to derive an estimate of the biomass per m2 of each taxon at each site on each occasion. Data were collected to quantify food webs detailing the flux of mass and nutrients between nodes of the food web. This dataset was created as part of work package 3.2 of the Wessex Biodiversity & Ecosystem Service Sustainability (BESS) project. Full details about this dataset can be found at https://doi.org/10.5285/7eee41f8-dbde-4b5e-b2d5-7296b5bfc558 Murphy, J. Queen Mary University of London j.f.murphy@qmul.ac.uk pointOfContact Jones, J.I. Queen Mary University of London j.i.jones@qmul.ac.uk author Arnold, A. Queen Mary University of London a.arnold@qmul.ac.uk author Pretty, J. Queen Mary University of London j.l.pretty@qmul.ac.uk author Duerdoth, C. Queen Mary University of London c.p.duerdoth@qmul.ac.uk author Murphy, J. Queen Mary University of London j.f.murphy@qmul.ac.uk author Hawczak, A. Queen Mary University of London adibabe_19@hotmail.com author Scott, L. Game and Wildlife Conservation Trust ljscott@gwct.org.uk author Lauridsen, R. Game and Wildlife Conservation Trust rlauridsen@gwct.org.uk author Beaumont, W. Game and Wildlife Conservation Trust wbeaumont@gwct.org.uk author NERC Environmental Information Data Centre info@eidc.ac.uk publisher NERC EDS Environmental Information Data Centre info@eidc.ac.uk custodian notPlanned Environmental Monitoring Facilities theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Wessex BESS otherRestrictions Registration is required to access this data otherRestrictions This resource is made available under the terms of the Open Government Licence otherRestrictions © Queen Mary University of London otherRestrictions © Game and Wildlife Conservation Trust otherRestrictions If you reuse this data, you should cite: Jones, J.I., Arnold, A., Pretty, J., Duerdoth, C., Murphy, J., Hawczak, A., Scott, L., Lauridsen, R., Beaumont, W. (2017). Fish biomass and density data for 3 intensively studied Wessex chalkstream sites, England, UK. NERC Environmental Information Data Centre https://doi.org/10.5285/7eee41f8-dbde-4b5e-b2d5-7296b5bfc558 textTable English utf8 biota 2012-10-01 2013-10-31 -2.981 -0.985 50.525 51.661 Comma-separated values (CSV) NERC EDS Environmental Information Data Centre info@eidc.ac.uk distributor https://data-package.ceh.ac.uk/sd/7eee41f8-dbde-4b5e-b2d5-7296b5bfc558.zip Supporting information Supporting information available to assist in re-use of this dataset information https://catalogue.ceh.ac.uk/datastore/eidchub/7eee41f8-dbde-4b5e-b2d5-7296b5bfc558/WP3_2_Food_Web_Fish_Community_Density_Biomass.csv Download the data Download a copy of this data fileAccess dataset dataset Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 Samples were collected on five separate occasions from the three sites. Sampling did not occur during the salmonid breeding season, December to March, so as not to disturb redds. Protocols and standard procedures were strictly followed for benthic fish sampling and electrofishing but there was no formal quality assurance procedure, such as repeat surveying of the same reach on a different day within the same sampling period. Electrofishing was undertaken by fully qualified and very experienced fish biologists (Bill Bellamy and Luke Scott) from the Game and Wildlife Conservation Trust. Fish populations were assessed by multi-pass electrofishing. Population density estimates were derived using the the Zippin maximum likelihood method (Zippin, 1958). As electrofishing is not particularly effective at catching certain benthic species e.g. bullheads, stone loach, we used a modified Hess sampler (0.12 m2) to assess populations of these species, deployed 20 times on each date, using a stratified-random regime. The mean biomass of individuals of each taxa captured at each site on each occassion was determined using length-mass regressions, and multiplied by the density estimate to derive a biomass estimate.