NRW_DS110120 eng dataset Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en pointOfContact 2026-03-03T14:27:56 MEDIN 3.1.2 wel eng utf8 British National Grid (EPSG::27700) The Abundance and Distribution of Waterfowl Within Milford Haven After the Sea Empress Oil Spill The Abundance and Distribution of Waterfowl Within Milford Haven After the Sea Empress Oil Spill Toreithrwydd a dosbarthiad adar dr yn Aberdaugleddau ar ol gollyngiad olew'r Sea Empress 2000-10-31 publication 4f4c4942-4343-5764-6473-313130313230 This study was put in place to assess whether the oil spill was to impact the nationally important waterfowl populations found in the area of Milford Haven. Two polluted (Angle Bay and Pembroke River) and two relatively unpolluted 'control' sites (the Carew/Cresswell and Cleddau Rivers) were monitored intensively over the three winters after the oil spill. The four sites have been monitored following standard Wetland Bird Survey (WeBS) methodology to assess the numbers of waterfowl present, and following standard British Trust for Ornithology all-day (across the tidal cycle) count methodology to assess the feeding areas most used. The data was captured to assess the impact of the Sea Empress oil spill on waterfowl populations in the Milford Haven area. Counts during winter took place between November and March as the estuary is most important for birds during the winter period. The migration and early autumn periods have been excluded because numbers of birds can fluctuate widely from year to year, for reasons not associated with the estuary. Each site was counted twice a month with one count on a spring tide and one on a neap tide where possible. In the first year, only one count was carried out at each site in November. Historical data was used from 1982-1999. This study was put in place to assess whether the oil spill was to impact the nationally important waterfowl populations found in the area of Milford Haven. Two polluted (Angle Bay and Pembroke River) and two relatively unpolluted 'control' sites (the Carew/Cresswell and Cleddau Rivers) were monitored intensively over the three winters after the oil spill. The four sites have been monitored following standard Wetland Bird Survey (WeBS) methodology to assess the numbers of waterfowl present, and following standard British Trust for Ornithology all-day (across the tidal cycle) count methodology to assess the feeding areas most used. The data was captured to assess the impact of the Sea Empress oil spill on waterfowl populations in the Milford Haven area. Counts during winter took place between November and March as the estuary is most important for birds during the winter period. The migration and early autumn periods have been excluded because numbers of birds can fluctuate widely from year to year, for reasons not associated with the estuary. Each site was counted twice a month with one count on a spring tide and one on a neap tide where possible. In the first year, only one count was carried out at each site in November. Historical data was used from 1982-1999. Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en owner Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en custodian 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=/ originator Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en distributor notPlanned Species distribution theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme waterfowl Milford Haven oil pollution pollution (see also specific types of pollution eg. oil pollution) Sea Empress abundance river Pembroke Wetland Bird Survey (WeBS) marine and freshwater inventory Angle Bay river Cleddau distributions Carew and Cresswell Rivers British Trust for Ornithology (BTO) theme NRW Thesaurus 2025-01-08 publication geonetwork.thesaurus.local.theme.converted_nrw-keywords Bird taxonomy-related abundance per unit area of surface theme SeaDataNet Parameter Discovery Vocabulary 2024-06-19 publication geonetwork.thesaurus.external.theme.rdf+xml Oil spillage theme IPSV Subjects List 2020-11-18 publication geonetwork.thesaurus.external.theme.subjects otherRestrictions There are no access restrictions to this data. NRW may release, publish or disseminate it freely. no limitations otherRestrictions © CNC/NRW 1997. There are no use restrictions on this data. Recipients may re-use, reproduce, disseminate this data free of charge in any format or medium, provided they do so accurately, acknowledging both the source and NRW's copyright, and do not use it in a misleading context. It is the recipient's responsibility to ensure the data is fit for the intended purpose, that dissemination or publishing does not result in duplication, and that it is fairly interpreted. Advice on interpretation should be sought where required. To avoid re-using old data, users should periodically obtain the latest version from the original source. © 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 copyright of the owners. It is the recipient's responsibility to ensure the data is fit for the intended purpose. vector eng utf8 biota SeaVoX Vertical Co-ordinate Coverages 2021-01-06 revision benthic boundary layer NRW Geographic Identifiers Collection 2024-01-01 publication Wales (WLS) -5.3019848 -4.39927902 51.50063889 51.90308775 1984-10-31 1999-11-30 Documents [A] Report (MS word, pdf-format, WordPerfect) 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 publication This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false This study monitored the use made by waterbirds of intertidal areas in the Cleddau Estuary over three winter seasons, in relation to oiling levels. Four sites were studied: - a heavily oiled site, Angle Bay; - a moderately oiled site, Pembroke River, and - two effectively non-oiled sites, the Carew/Cresswell rivers and the 'Upper Cleddau', where the Eastern and Western Cleddau meet. The species recorded include divers, grebes, cormorants, herons, wildfowl, waders and auks. In order to monitor all species comprehensively, an area of open water was also counted at each site. In order to gain a full picture of the use of the four intertidal areas by waterfowl and other birds, counts were carried out across the tidal cycle. This choice of methodology allows the most important feeding areas to be identified. Each site was counted once every hour from six hours before to five hours after low tide. Increased monitoring efforts and impact assessment following the Sea Empress oil spill. This study monitored the use made by waterbirds of intertidal areas in the Cleddau Estuary over three winter seasons, in relation to oiling levels. Four sites were studied: - a heavily oiled site, Angle Bay; - a moderately oiled site, Pembroke River, and - two effectively non-oiled sites, the Carew/Cresswell rivers and the 'Upper Cleddau', where the Eastern and Western Cleddau meet. The species recorded include divers, grebes, cormorants, herons, wildfowl, waders and auks. In order to monitor all species comprehensively, an area of open water was also counted at each site. In order to gain a full picture of the use of the four intertidal areas by waterfowl and other birds, counts were carried out across the tidal cycle. This choice of methodology allows the most important feeding areas to be identified. Each site was counted once every hour from six hours before to five hours after low tide. Increased monitoring efforts and impact assessment following the Sea Empress oil spill.