EMODnet Product Catalogue
[GB100233] 2011 Natural England/Cefas Isles of Scilly SAC offshore video survey
This map comes from a report which describes the results from an interdisciplinary field survey aimed at identifying the location, extent and condition of Annex I habitat features in the Isles of Scilly Special Area of Conservation (SAC). One of the qualifying marine features for SAC designation is the Annex 1 reef habitat, and this report describes results a field survey (combining new acoustic sidescan and multibeam data together with ground-truthing video and stills) to determine the presence, extent and quality of Annex 1 reef.
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| Alternate title | GB100233 |
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| Date | 2013-09-17T00:00:00.000Z |
| Date type | Creation: Date identifies when the resource was brought into existence |
| Unique resource identifier | 628d92eb-1d82-41fc-a5ae-769023a4fba7 |
Point of contact
| Organisation name | Natural England |
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| Electronic mail address | MarineGIData@naturalengland.org.uk |
| Role | Owner: Party that owns the resource |
Descriptive keywords
| GEMET - INSPIRE themes, version 1.0 | |
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habitat
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biotope
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| Spatial representation type | Vector: Vector data is used to represent geographic data |
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| Denominator | 87000 |
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| Language | English |
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Reference System Information
| Unique resource identifier | http://www.opengis.net/def/crs/EPSG/0/3857 |
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| Hierarchy level | Dataset: Information applies to the dataset |
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Lineage
| Statement | The biotope map showed the presence and extent of Annex I rocky reef sub-features (as defined by the Isle of Scilly Management scheme 2010), this has been determined by acoustic and video ground-truthing on two survey occasions in 2011. The combined surveys confirmed the presence of upstanding and boulder reefs (high confidence Annex 1 reef) up to 0.5-1.5 nautical miles off the coast, covering a total of 809 hectares. These complex rock formations were assigned to one (or combination) of five EUNIS classifications; A3.2142, A4.121, A4.131, A4.132 and A4.139 characterised by species such as Laminaria spp.(A3.2142 only), Corynactis viridis, Caryophyllia smithii, Pentapora fascialis, Metridium senile, Alcyonium digitatum, axinellid sponges and Eunicella verrucosa. Low lying boulders and raised bedrock found within the medium confidence Annex I reef (covering 393 hectares) contained biotope A4.2122 (characterised by P. fascialis and C. smithii). The area of flat bedrock was not classed as Annex I reef and was ascribed to EUNIS classes A4.2 and A4.21. Further areas of sandy and coarse sediment were found in the offshore region and ascribed to EUNIS biotopes A5.4, A5.441, A5.2 and A5.41. The results arising from the 2011 surveys were compared with those from a previous survey conducted by Munro and Nunny (1998). However, this comparison was limited since there were only a few instances where both investigations surveyed the same areas. Nevertheless, the 2011 surveys did reveal some areas of reef which had previously been recorded as sediment habitat. In the map itself each of the polygons was assigned a EUNIS code of 'A4.1' due to the report indicating multiple EUNIS codes. This 'A4.1' was used in the translation from EUNIS version 2007-11 into Habitats Directive Annex I Habitats. This was completed by JNCC and was also formatted to meet the Data Exchange Format v4.1 required for EMODnet uploads in February 2024. |
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| Distribution format | ESRI Shapefile (Version: 1) GML (Version: 3.2.1) | ||||||||||||||||||||||||||||
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| File identifier | 628d92eb-1d82-41fc-a5ae-769023a4fba7 | ||||||
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| Metadata language | English | ||||||
| Character set | UTF8: 8-bit variable size UCS Transfer Format, based on ISO/IEC 10646 | ||||||
| Hierarchy level | Dataset: Information applies to the dataset | ||||||
| Date stamp | 2024-03-26T10:16:00.284Z | ||||||
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Associated resources
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