4f4c4942-4343-5764-6473-313130313032 English Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2024-05-31T09:37:33.255Z NRW 1.0 wel British National Grid (EPSG::27700) Autecological study of Thick Top Shell, Osilinus lineatus (Monodonta lineata), in the area affected by the Sea Empress oil spill (1996 and 1997). Autecological study of Thick Top Shell, Osilinus lineatus (Monodonta lineata), in the area affected by the Sea Empress oil spill (1996 and 1997). Astudiaeth awtecolegol o Osilinus lineatus (Monodonta lineata) yn yr ardal yr effeithiodd gollyngiad olew'r Sea Empress arni, yn ystod 1996 a 1997 1999-02-28 NRW_DS110102 After the oil spill from the Sea Empress investigations were initiated into the biota of many of the habitats affected. One of the species known to be susceptible to oil pollution, that had been studied previously and that would not be adequately investigated by the proposed investigations was the toothed or thick top shell Osilinus lineatus, an animal commonly found on shores in western Britain. Data collected in order to establish the population age and size structure at each study site and allow an assessment of the impact the Sea Empress oil spill has had on these populations of Osilinus linaetus. As of 1 April 2013, the Countryside Council for Wales, Environment Agency Wales and Forestry Commission Wales became Natural Resources Wales / Cyfoeth Naturiol Cymru. After the oil spill from the Sea Empress investigations were initiated into the biota of many of the habitats affected. One of the species known to be susceptible to oil pollution, that had been studied previously and that would not be adequately investigated by the proposed investigations was the toothed or thick top shell Osilinus lineatus, an animal commonly found on shores in western Britain. Data collected in order to establish the population age and size structure at each study site and allow an assessment of the impact the Sea Empress oil spill has had on these populations of Osilinus linaetus. As of 1 April 2013, the Countryside Council for Wales, Environment Agency Wales and Forestry Commission Wales became Natural Resources Wales / Cyfoeth Naturiol Cymru. Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Countryside Council for Wales (CCW) Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW enquiries@naturalresourceswales.gov.uk http://naturalresourceswales.gov.uk/splash?orig=/ Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en sd">Species distribution Species distribution GEMET - INSPIRE themes, version 1.0 GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme osilinus lineatus toothed shell (thick top shell) monodonta lineata (da Costa) thick topshell Sea Empress Milford Haven marine and freshwater inventory population age structure population size structure lincoln index mark-release-recapture NRW Thesaurus NRW Thesaurus 2023-12-31 geonetwork.thesaurus.local.theme.converted_nrw-keywords Zoobenthos taxonomic abundance SeaDataNet Parameter Discovery Vocabulary SeaDataNet Parameter Discovery Vocabulary 2021-01-06 geonetwork.thesaurus.external.theme.rdf+xml oil spillage Integrated Public Sector Vocabulary Integrated Public Sector Vocabulary 2013-04-03 geonetwork.thesaurus.external.theme.subjects There are no access restrictions on this data. NRW may release, publish or disseminate it freely. no limitations © CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose. English biota SeaVoX Vertical Co-ordinate Coverages SeaVoX Vertical Co-ordinate Coverages 2021-01-06 benthic boundary layer England (ENG) Wales (WLS) -5.8202329 -3.44358209 49.83409451 52.28512514 1996-02-01 1997-12-31 An autecological study of Osilinus lineatus in the area affected by the Sea Empress oil spill Documents Report (MS Word, PDF-format) 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 false In August 1996 six sites were visited in five days to set up sample populations of Osilinus lineatus to investigate the population size, distribution and age structure at sites where such studies had previously been carried out albeit over a decade ago. This first fieldwork in 1996 established that it would be necessary to allow one tide per site and that realistically after the end of August that means one day for each site because of shortening day length. A simple Lincoln index, mark-release-recapture technique was used to estimate the size of the population from which the survey samples were taken. In September 1997 all of the sites were revisited to sample the population, and where reasonably large samples could be found, they were marked and released. Fieldwork in 1997 included additional checks on 1996 recruitment as the growing animals became easier to spot as they changed their habits and moved around into less cryptic micro habitats. Between 1982 and 1983 a programme of experimental field work was conducted to complement the fixed, interrupted, belt transect monitoring studies of rocky shores in Milford Haven. The only data associated with this project is held within the report. In August 1996 six sites were visited in five days to set up sample populations of Osilinus lineatus to investigate the population size, distribution and age structure at sites where such studies had previously been carried out albeit over a decade ago. This first fieldwork in 1996 established that it would be necessary to allow one tide per site and that realistically after the end of August that means one day for each site because of shortening day length. A simple Lincoln index, mark-release-recapture technique was used to estimate the size of the population from which the survey samples were taken. In September 1997 all of the sites were revisited to sample the population, and where reasonably large samples could be found, they were marked and released. Fieldwork in 1997 included additional checks on 1996 recruitment as the growing animals became easier to spot as they changed their habits and moved around into less cryptic micro habitats. Between 1982 and 1983 a programme of experimental field work was conducted to complement the fixed, interrupted, belt transect monitoring studies of rocky shores in Milford Haven. The only data associated with this project is held within the report.