{
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    "@type": "Dataset",
    "@id": "http://portal.medin.org.uk/portal/json-ld/21a79c3c1de95de1a93456d3c9885a13.jsonld",
    "identifier": "21a79c3c1de95de1a93456d3c9885a13",
    "url": "http://portal.medin.org.uk/portal/?details&tpc=21a79c3c1de95de1a93456d3c9885a13",
    "name": "2018 Natural England (NE) Digital video aerial surveys of red-throated diver in the Outer Thames Estuary Special Protection Area",
    "description": "This report provides a new population estimate for the original Outer Thames Estuary SPA \r\n for red throated diver of 21,997. The estimated total for the new, enlarged SPA (formerly \r\n the pSPA) is 22,280. Both these figures are approximately 3.5 times greater than the \r\n notified population of the original SPA (6,466 individuals).\r\n This increase in the recorded number of red-throated divers, coupled with the numbers of \r\n individuals of other species recorded has resulted in a peak waterbird population estimate \r\n across the original SPA of 41,918 and across the newly enlarged SPA of 46,056 individuals. \r\n This suggests that on occasion the SPA supports an assemblage of wintering waterbirds \r\n well in excess of the size (20,000 individuals) required to consider this to be qualifying \r\n feature of the SPA. \r\n Red-throated divers appear to use the additional area now included within the larger \r\n revised SPA boundary at low densities and at high tide when mudflats are covered.\r\n Anthropogenic effects on the distribution of several species were detected, notably strong \r\n displacement of red-throated diver was noted from areas within offshore windfarms and \r\n from areas of shipping activity. This lead to higher densities of birds at points furthest from \r\n anthropogenic activity.",
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    "conditionsOfAccess": [
        "otherRestrictions: OGL"
    ],
    "temporalCoverage": "2018-02-04/2018-02-17",
    "keywords": [
        {
            "@type": "DefinedTerm",
            "identifier": "http://vocab.nerc.ac.uk/collection/N01/current/NDGO0001/",
            "inDefinedTermSet": "http://vocab.nerc.ac.uk/collection/N01/current/",
            "termCode": "NDGO0001",
            "name": "Marine Environmental Data and Information Network"
        },
        {
            "@type": "DefinedTerm",
            "identifier": "http://vocab.nerc.ac.uk/collection/P22/current/31/",
            "inDefinedTermSet": "http://vocab.nerc.ac.uk/collection/P22/current/",
            "termCode": "31",
            "name": "Habitats and biotopes"
        },
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            "identifier": "http://vocab.nerc.ac.uk/collection/P02/current/HBEX/",
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            "termCode": "HBEX",
            "name": "Habitat extent"
        }
    ],
    "spatialCoverage": {
        "@type": "Place",
        "geo": {
            "@type": "GeoShape",
            "box": "51.3751 -0.1122 52.466 2.0301"
        },
        "additionalProperty": [
            {
                "@type": "PropertyValue",
                "propertyID": "http://www.opengis.net/def/crs/OGC/1.3/CRS84",
                "value": "urn:ogc:def:crs:EPSG:4326"
            }
        ]
    },
    "maintainer": [
        {
            "@type": "Organization",
            "name": "Natural England",
            "description": "custodian",
            "email": "enquiries@naturalengland.org.uk",
            "telephone": "+44 (0)300 060 3900",
            "faxNumber": "+44 (0)300 060 2356",
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                "streetAddress": "Foss House, Kings Pool, 1-2 Peasholme Green",
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                "addressLocality": "York"
            }
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    ],
    "producer": [
        {
            "@type": "Organization",
            "name": "HiDef Aerial Surveying Limited",
            "description": "originator",
            "email": "catherine.irwin@hidefsurveying.co.uk",
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        }
    ],
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            }
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            "faxNumber": "+44 (0)300 060 2356",
            "address": {
                "@type": "PostalAddress",
                "streetAddress": "Foss House, Kings Pool, 1-2 Peasholme Green",
                "postalCode": "YO1 7PX",
                "addressLocality": "York"
            }
        }
    ],
    "creator": [
        {
            "@type": "Organization",
            "name": "HiDef Aerial Surveying Limited",
            "description": "originator",
            "email": "catherine.irwin@hidefsurveying.co.uk",
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        "url": "https://portal.medin.org.uk/portal/",
        "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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}