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Metadata: 2018 Natural England (NE) Digital video aerial surveys of red-throated diver in the Outer Thames Estuary Special Protection Area
Abstract:
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.
Data holder:
Natural England
Use constraints:
OGL
| Other details | ||
| Internal code | Internally assigned metadata identifier | 547 |
| Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | 2018 Natural England (NE) Digital video aerial surveys of red-throated diver in the Outer Thames Estuary Special Protection Area |
| File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | 21a79c3c1de95de1a93456d3c9885a13 |
| Resource Identifier | This is the code assigned by the data owner. | NECR260 |
| Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | dataset |
| Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 2018-02-04 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2018-02-17 |
| Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | inapplicable |
| Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | notPlanned |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | 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. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | HiDef Aerial Surveying Limited (HiDef) were contracted by Natural England to undertake digital aerial surveys of the Outer Thames Estuary SPA with the core objective being to ascertain numbers of red-throated diver Gavia stellata. Recording of secondary species was to take place but was not deemed the priority of the project. Flights were undertaken on 4 and 17 February 2018, with two Diamond Aviation (DA) 42 Twin Star aircraft flying sorties on each date. Results for these surveys are presented in this report alongside comparisons with previous surveys. When this contract was commissioned (autumn 2017) a decision to extend the existing Outer Thames Estuary SPA to include an additional c.95km² of sea, adjacent to its existing southern boundary off the Essex coast, with a revised pSPA boundary was pending. This was approved during the course of the contract. Therefore, two sets of numbers are presented at key points in the report to describe numbers within the new, extended SPA boundary and within the smaller boundary of the original SPA. The latter allows easier comparisons with previous surveys that covered only the original SPA. The new pSPA enlarges the existing Outer Thames Estuary SPA (classified solely for nonbreeding red-throated divers) to include three new areas identified for foraging terns Sterna sp. breeding at other (already classified) SPAs on shore, these are parts of the Rivers Yare and Bure, a small riverine section at Minsmere, and both estuarine and marine areas around Foulness. The pSPA therefore comprises areas for foraging breeding seabirds and non-breeding waterbirds. The feature of the existing SPA is retained, and new qualifying features are added based on a review of up-to-date bird abundance information. The total area of the Outer Thames Estuary pSPA is approx. 391,910 ha (392km²). |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Habitats and biotopes | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Habitat extent | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 52.466 |
| East | The eastern-most limit of the data resource in decimal degrees | 2.0301 |
| South | The southern-most limit of the data resource in decimal degrees | 51.3751 |
| West | The western-most limit of the data resource in decimal degrees | -0.1122 |
| Regional sea | littoral | |
| Responsible organisations | ||
| Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
| Organisation name | Natural England | |
| Position name | Marine GI Team | |
| Phone | +44 (0)300 060 3900 | |
| Fax | +44 (0)300 060 2356 | |
| Delivery point | Foss House, Kings Pool, 1-2 Peasholme Green | |
| Postal code | YO1 7PX | |
| City | York | |
| enquiries@naturalengland.org.uk | ||
| Role | The distributor is the person or organisation that distributes the resource. | distributor |
| Organisation name | Natural England | |
| Position name | Marine GI Team | |
| Phone | +44 (0)300 060 3900 | |
| Fax | +44 (0)300 060 2356 | |
| Delivery point | Foss House, Kings Pool, 1-2 Peasholme Green | |
| Postal code | YO1 7PX | |
| City | York | |
| enquiries@naturalengland.org.uk | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | HiDef Aerial Surveying Limited | |
| Individual name | Catherine Irwin | |
| Position name | Lead Project Manager | |
| catherine.irwin@hidefsurveying.co.uk | ||
| Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
| Organisation name | Natural England | |
| Position name | Marine GI Team | |
| Phone | +44 (0)300 060 3900 | |
| Fax | +44 (0)300 060 2356 | |
| Delivery point | Foss House, Kings Pool, 1-2 Peasholme Green | |
| Postal code | YO1 7PX | |
| City | York | |
| enquiries@naturalengland.org.uk | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | http://publications.naturalengland.org.uk/publication/4813740218515456 |
| Dataset constraints | ||
| 20 Limitations on Public Access - Access constraints | otherRestrictions | |
| 20 Limitations on Public Access - Other constraints | This states any limitations on access to the data and uses free text. | OGL |
| 21 Conditions for Access and Use - Use limitation | This states any constraints on use of the data. Multiple conditions can be recorded for different parts of the data resource. If no conditions apply, then `No condtions apply` is recorded. This uses free text. | OGL |
| Version info | ||
| Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 2018-06-28 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-19 |
| Metadata date | The date when the content of this metadata record was last updated. | 2022-01-31 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN Discovery metadata standard |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 2.3.8 |