{
    "@context": "https://schema.org",
    "@type": "Dataset",
    "@id": "http://portal.medin.org.uk/portal/json-ld/NRW_DS110120.jsonld",
    "identifier": "NRW_DS110120",
    "url": "http://portal.medin.org.uk/portal/?details&tpc=NRW_DS110120",
    "name": "The Abundance and Distribution of Waterfowl Within Milford Haven After the Sea Empress Oil Spill",
    "description": "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. \r\n\r\nTwo 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. \r\n\r\nCounts 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.",
    "includedInDataCatalog": {
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    },
    "conditionsOfAccess": [
        "access: There are no access restrictions to this data. NRW may release, publish or disseminate it freely.",
        "access: no limitations",
        "use: \u00a9 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.",
        "use: \u00a9 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."
    ],
    "temporalCoverage": "1984-10-31/1999-11-30",
    "keywords": [
        {
            "@type": "DefinedTerm",
            "identifier": "http://inspire.ec.europa.eu/theme/sd",
            "name": "Species distribution"
        },
        {
            "@type": "DefinedTerm",
            "name": "waterfowl"
        },
        {
            "@type": "DefinedTerm",
            "name": "Milford Haven"
        },
        {
            "@type": "DefinedTerm",
            "name": "oil pollution"
        },
        {
            "@type": "DefinedTerm",
            "name": "pollution (see also specific types of pollution eg. oil pollution)"
        },
        {
            "@type": "DefinedTerm",
            "name": "Sea Empress"
        },
        {
            "@type": "DefinedTerm",
            "name": "abundance"
        },
        {
            "@type": "DefinedTerm",
            "name": "river Pembroke"
        },
        {
            "@type": "DefinedTerm",
            "name": "Wetland Bird Survey (WeBS)"
        },
        {
            "@type": "DefinedTerm",
            "name": "marine and freshwater inventory"
        },
        {
            "@type": "DefinedTerm",
            "name": "Angle Bay"
        },
        {
            "@type": "DefinedTerm",
            "name": "river Cleddau"
        },
        {
            "@type": "DefinedTerm",
            "name": "distributions"
        },
        {
            "@type": "DefinedTerm",
            "name": "Carew and Cresswell Rivers"
        },
        {
            "@type": "DefinedTerm",
            "name": "British Trust for Ornithology (BTO)"
        },
        {
            "@type": "DefinedTerm",
            "identifier": "http://vocab.nerc.ac.uk/collection/P02/current/BRDD/",
            "inDefinedTermSet": "http://vocab.nerc.ac.uk/collection/P02/current/",
            "termCode": "BRDD",
            "name": "Bird taxonomy-related abundance per unit area of surface"
        },
        {
            "@type": "DefinedTerm",
            "name": "Oil spillage"
        }
    ],
    "spatialCoverage": {
        "@type": "Place",
        "geo": {
            "@type": "GeoShape",
            "box": "51.50063889 -5.3019848 51.90308775 -4.39927902"
        },
        "additionalProperty": [
            {
                "@type": "PropertyValue",
                "propertyID": "http://www.opengis.net/def/crs/EPSG/0/27700",
                "value": "National Grid of Great Britain - urn:ogc:def:crs:EPSG::27700"
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    "author": [
        {
            "@type": "Organization",
            "name": "Natural Resources Wales (NRW)",
            "description": "owner",
            "email": "enquiries@naturalresourceswales.gov.uk",
            "address": {
                "@type": "PostalAddress",
                "streetAddress": "Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales"
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        "name": "Marine Environmental Data and Information Network (MEDIN)",
        "description": "The MEDIN portal contains information about 19493 marine datasets from over 600 UK organisations. Metadata are an enduring resource and contact details are publicly available for a long time. \r\n\t\tPlease contact us (enquiries@medin.org.uk) if you find your contact details on the MEDIN portal and do not consent to this. \r\n\t\tYou can now use our GitHub repository to report issues or access related documents. Metadata records are updated daily and were last updated 2026-04-19. Record deletion takes place weekly and the latest occurred 2026-04-12."
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