2018 Natural England (NE) Digital video aerial surveys of red-throated diver in the Outer Thames Estuary Special Protection Area

• Published by: Marine Environmental Data & Information Network
• Last updated: 10 July 2024
• Topic: Not added
• Licence: Other Licence ; View licence information

Summary

This report provides a new population estimate for the original Outer Thames Estuary SPA for red throated diver of 21,997. The estimated total for the new, enlarged SPA (formerly the pSPA) is 22,280. Both these figures are approximately 3.5 times greater than the notified population of the original SPA (6,466 individuals). This increase in the recorded number of red-throated divers, coupled with the numbers of individuals of other species recorded has resulted in a peak waterbird population estimate across the original SPA of 41,918 and across the newly enlarged SPA of 46,056 individuals. This suggests that on occasion the SPA supports an assemblage of wintering waterbirds well in excess of the size (20,000 individuals) required to consider this to be qualifying feature of the SPA. Red-throated divers appear to use the additional area now included within the larger revised SPA boundary at low densities and at high tide when mudflats are covered. Anthropogenic effects on the distribution of several species were detected, notably strong displacement of red-throated diver was noted from areas within offshore windfarms and from areas of shipping activity. This lead to higher densities of birds at points furthest from anthropogenic activity.

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Related datasets

• 2013 Natural England (NE) Aerial Bird Surveys in the Outer Thames SPA
• 2012, DHI and British Trust for Ornithology, London Array Offshore Wind Farm, Modelling the abundance and area use of wintering Red-throated Divers in the Outer Thames Estuary
• Natural England (NE) Isle of Wight Brading Marshes to St Helens Ledges, Kings Quay Shore and Yar Estuary Biological Survey of the Intertidal sediments of Sites of Special Scientific Interest (SSSI) for the Purpose of Condition Assessment

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• Added to data.gov.uk: 2022-01-31
• Access contraints: OGL
• Harvest GUID: 21a79c3c1de95de1a93456d3c9885a13
• Extent: Latitude: 52.4660° to 51.3751°
• Extent: Longitude: -0.1122° to 2.0301°
• Spatial reference system: urn:ogc:def:crs:EPSG::4326
• Dataset reference date: 2018-06-28 (publication)
• Frequency of update: notPlanned
• Responsible party: HiDef Aerial Surveying Limited (originator); Natural England (custodian)
• ISO 19139 resource type: dataset
• Metadata language: eng
• Source Metadata: XML
• Source Metadata: HTML

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OGL