Effects of the Sea Empress oil spillage on sensitive sessile marine invertebrate communities
The grounding of the Sea Empress at the mouth of Milford Haven in February 1996 resulted in oil polluted shorelines from the south of St Brides Bay to Pendine Sands. This dataset contains the results of an investigation into the effects of the oiling and its clean-up on sensitive sessile intertidal communities of marine invertebrates and the results of an investigation into possible effects of the oil/clean up on the biology of Alcyonidium species at Dale and Angle. The purpose of these investigations were to survey the lower shore sessile fauna on the north side of St Catherine's Island, Tenby documenting the present composition of the sessile fauna, to assess what changes had occurred since the 1950s and whether any of these might be attributable to the oiling an clean up following the Sea Empress grounding; and investigate the effect of the oil on the reproduction and recruitment of Alcyonidium species (Bryozoa) on Fucus serratus at Dale and Angle in Milford Haven and at control sites in Solva Harbour.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS110219
- Alternative Title
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- 1996 Putron PMSA -Sea Empress oil spill effects on sessile marine invertebrate survey MRCCW10000000090
- Metadata Language
- English
- Lineage
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Five 0.2 m x 0.2 m permanent quadrats were established along a transect extending for 82 m on the north side of St Catherine's Island. Percentage cover of conspicuous species calculated using image analysis technique, the growth and regression of the dominant ascidian Morchellium argus was calculated as were the varying cover and degree of fragmentation of the sponges Hymeniacidon perleve and Halichondria panacea. Sessile fauna list compiled by examining the shore during spring tides. In addition to this a survey was done which followed the reproduction and growth of the Alcyonidium spp over the year, inclusive from settlement to reproductive maturity of a cohort. It took area measurements of the Alcyonidium colonies to monitor growth rates and used image analysis package to determine colony areas for growth data.
- Dataset Reference Date (Publication)
- 1998-08-31
Temporal Extent
- Begin date
- 1996-07-31
- End date
- 1997-11-14
- Topic category
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- Biota
Extent
Extent
- Geographic Extent
- SIR BENFRO - PEMBROKESHIRE
))
Vertical Extent
- Medin Extent Keyword
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benthic boundary layer
Distribution
- Format Type and Description
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Documents
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)
- Specification
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[A] Report in PDF format [B] Marine Recorder survey MRCCW10000000090
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Documents
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)
Quality
Data quality
- Quality Scope
- Dataset
- Conformity
- Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Explanation
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This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
- Lineage
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Five 0.2 m x 0.2 m permanent quadrats were established along a transect extending for 82 m on the north side of St Catherine's Island. Percentage cover of conspicuous species calculated using image analysis technique, the growth and regression of the dominant ascidian Morchellium argus was calculated as were the varying cover and degree of fragmentation of the sponges Hymeniacidon perleve and Halichondria panacea. Sessile fauna list compiled by examining the shore during spring tides. In addition to this a survey was done which followed the reproduction and growth of the Alcyonidium spp over the year, inclusive from settlement to reproductive maturity of a cohort. It took area measurements of the Alcyonidium colonies to monitor growth rates and used image analysis package to determine colony areas for growth data.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
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NRW Thesaurus
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- marine biology (subtidal biology) (littoral biology) (sublittoral biology)(intertidal biology)(see also seashore)
- Sea Empress
- marine and freshwater inventory
- invertebrates (see also specific species)
- Milford Haven
- Tenby
- sessile marine invertebrates
- St Catherine's Island
- communities
- marine invertebrates
- Type
- Theme
Citation
- Date (Publication)
- 2026-08-27
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2024-06-19
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
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An appraisal of the effects of the Sea Empress oil spillage on sensitive sessile marine invertebrate communities
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW 1998 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.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313130323139 XML
- Metadata Language
- English
- Parent Identifier
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Pembrokeshire Marine Species Atlas (PMSA)
NRW_DS24328
- Resource type
- Dataset
- Metadata Date
- 2026-09-28T13:48:22.767Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0