4f4c4942-4343-5764-6473-313134373232 eng dataset Natural Resources Wales (NRW) 0300 065 3000 Maes-y-Ffynnon LL57 2DW enquiries@naturalresourceswales.gov.uk pointOfContact 2023-01-30 Gemini 2.2 urn:ogc:def:crs:EPSG::WGS84 OGP Seabirds at Sea Evidence Base Collated seabird distribution and abundance data in Welsh waters Adar mor sylfaen tystiolaeth WWT and ESAS combined seabirds at sea 2010-07-01 publication 2011-10-01 revision 114722 https://naturalresources.wales GIS layers showing the abundance and distribution of seabirds in welsh waters. The datasets consists of the raw data showing observations of all seabirds and derived grids showing the density of flying and sitting species on a 3km grid scale and the survey coverage. The purpose of this data capture was to collate data from ESAS and WWT Consulting databases to produce combined database of birds recorded from surveys of Welsh waters. Other sources identified were also consulted to produce the most complete representation of the observed distribution of seabirds. Natural Resources Wales (NRW) 0300 065 3000 Maes-y-Ffynnon LL57 2DW enquiries@naturalresourceswales.gov.uk owner Wildfowl And Wetlands Trust (WWT) 01453 891900 Wildfowl and Wetlands Trust (WWT) GL2 7BT consulting@wwt.org.uk originator Joint Nature Conservancy Committee (JNCC) 01733 562626 Joint Nature Conservancy Committee (JNCC) Monkstone House n/a originator notPlanned Geographic Information System Species distribution GEMET - INSPIRE themes, version 1.0 2023-01-31 publication Birds Biodiversity Integrated Public Sector Vocabulary (IPSV) 2023-01-31 publication © 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. Attribution statement: Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. otherRestrictions There are no access restrictions to this data. NRW may release, publish or disseminate it freely. 3000 eng biota ISO3166 Countries 2023-01-31 publication Wales (WLS) -6.04366756 -2.09400654 51.02753754 53.90937820 1980-08-08 2009-08-07 Natural Resources Wales (NRW) 0300 065 3000 Maes-y-Ffynnon LL57 2DW enquiries@naturalresourceswales.gov.uk distributor https://datamap.gov.wales/layergroups/inspire-nrw:SeabirdsAtSea Download Data and Web Services https://datamap.gov.wales/capabilities/layergroup/882/?access_token=i61nd1X0RwdwAgQrGW0sqAsWxBMiwx&ows_service=wms Web Mapping Service dataset The two main sources of seabird distribution and abundance data for welsh waters are held in JNCC's European Seabirds at Sea (ESAS) database and the Wildfowl and Wetlands (Consulting) Ltd marine aerial surveys database. A collation for Wales was created by producing a database containing all the fields from both datasets. This was then populated. The data was 'cleaned' to remove non-bird objects and data. A GIS layer was produced and supplied from the database. Density and abundance maps as well as survey coverage were derived from the database using a 3km by 3km grid created in ArcGIS. A detailed methodology and the approach taken is described in the WWT Report "Collating seabird distribution and abundance data in Welsh waters to support provision of strategic advice on the relative risk of deployment of tidal stream devices". Originally the density maps were produced to provide evidence about mobile species and their sensitivity to tidal stream devices (See NRW project 309 media 1230). This dataset is an update based on the same methodology but includes all gull species which were not required for the renewables work. The selection of the highest value from the combined JNCC ESAS and WWT datasets for each grid cell is in line with the Precautionary Principle. This may lead to an overestimation of abundance in some grid cells but will reflect the highest potential use of each cell by diving bird species. In addition diving bird density values for each grid cell were standardised according to survey effort so that those grid cells for which there is a very low level of effort may have an overestimation of overall abundance. It is important to interpret these evidence layers in conjunction with information on the underlying survey effort.