Status and Breeding of Cormorants Phalacrocorax carbo in Wales (1996-1997): The Effect of the Sea Empress Oil Spill
Statws a nythu mulfrain Phalacrocorax carbo yng Nghymru: effaith gollyngiad olew'r Sea Empress

  • English
  • wel
  • All

The Sea Empress Environmental Evaluation Committee (SEEEC) and the Countryside Council for Wales (CCW) commissioned various studies of the effects of the oil spill on the wildlife of Pembrokeshire. This dataset contains the results of work carried out to investigate the effects of the spill on Cormorants Phalacrocorax carbo.


In 1996 the project aimed to carry out a survey of the numbers, distribution and breeding performance of cormorants breeding in Wales, including detailed case studies at colonies in the area contaminated by oil in south and west Pembrokeshire. Monitoring of numbers and breeding performance was continued in 1997 with detailed studies of breeding phenology and breeding success at two South Pembrokeshire colonies (St Margaret's Island and Green Scar).

Data was used to assess the numbers and distribution of Cormorants breeding in Wales; and to investigate the breeding performance of Cormorants in Wales, including detailed case studies at colonies in the area contaminated by oil in south and west Pembrokeshire.

Identification

Dynodydd
Identifier
NRW_DS110099
Laith Metadata
Metadata Language
English
Lineage

1996: Case studies of breeding phenology and breeding success were carried out at four colonies in South Pembrokeshire. The count unit adopted was the apparently occupied nest (aon). A colony was defined as any aggregation of nests separated by at least 500 m from the next nearest aggregation. Breeding cormorants were counted by single counts timed to coincide with the main incubation or early chick-rearing stages (late May to early June)At colonies in which studies of breeding biology were being conducted repeat counts throughout the breeding period, also recording the position and status of all nests were taken. This technique allows early failures and late starters to be identified and is therefore the most accurate method. Brood size was monitored at 11 colonies in Wales: four in South Pembrokeshire close to the source of the oil spill , three in Cardigan Bay and four in North Wales. For comparison, data were also collected from three colonies in Devon and one in Caithness. All were visited on at least one occasion when the young were between four weeks old and fledging.


1997: Survey methodology follows that of Cormorant Breeding Colony Survey ( Sellers 1997). Brood size monitored at 8 colonies and three visits were made to St Margaret's Island and Green Scar to monitor breeding success.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
1997-11-30
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Countryside Council for Wales (CCW) -
Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW
http://naturalresourceswales.gov.uk/splash?orig=/
 

Extent

Extent

Hyd
Geographic Extent
Wales (WLS)
Hyd
Geographic Extent
England (ENG)
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword
water column boundary layer
 
 

Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Documents ( )

    Specification

    [A] Paper reports (MS Word, pdf-format)

 

Quality

Ansawdd Data
Data quality

Cwmpas Ansawdd
Quality Scope
Dataset
Dataset
Cydymffurfiad
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

This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
Degree
false
Lineage

1996: Case studies of breeding phenology and breeding success were carried out at four colonies in South Pembrokeshire. The count unit adopted was the apparently occupied nest (aon). A colony was defined as any aggregation of nests separated by at least 500 m from the next nearest aggregation. Breeding cormorants were counted by single counts timed to coincide with the main incubation or early chick-rearing stages (late May to early June)At colonies in which studies of breeding biology were being conducted repeat counts throughout the breeding period, also recording the position and status of all nests were taken. This technique allows early failures and late starters to be identified and is therefore the most accurate method. Brood size was monitored at 11 colonies in Wales: four in South Pembrokeshire close to the source of the oil spill , three in Cardigan Bay and four in North Wales. For comparison, data were also collected from three colonies in Devon and one in Caithness. All were visited on at least one occasion when the young were between four weeks old and fledging.


1997: Survey methodology follows that of Cormorant Breeding Colony Survey ( Sellers 1997). Brood size monitored at 8 colonies and three visits were made to St Margaret's Island and Green Scar to monitor breeding success.
 

Keywords

Allweddair
Keywords

GEMET - INSPIRE themes, version 1.0
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Allweddair
Keywords

NRW Thesaurus
  • distributions
  • breeding performance
  • Sea Empress
  • breeding birds
  • colonies
  • case studies
  • phalacrocorax carbo
  • breeding
  • Pembrokeshire (county pre 1974)( county since 4/96)
  • marine and freshwater inventory
  • cormorants
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2026-03-02
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Allweddair
Keywords

SeaDataNet Parameter Discovery Vocabulary
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2024-06-19
Code
geonetwork.thesaurus.external.theme.rdf+xml

Allweddair
Keywords

IPSV Subjects List
  • Oil spillage
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2020-11-18
Code
geonetwork.thesaurus.external.theme.subjects
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

NRW Related Title

Status and breeding success of cormorants phalacrocorax carbo in Wales in 1996 : the effect of the Sea Empress oil spill
NRW Related Title

Status and breeding success of Cormorants Phalacrocorax carbo in Wales 1997.
 

Constraints

Constraints

Limitations on Public Access and Use

Math o Gyfyngiad
Restriction type
Other restrictions
Other restrictions
 

Access Constraints Directive

Limitations
no limitations
 

Access Constraints Text

Other constraints

There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
 

Use Constraints

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© CNC/NRW 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

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313130303939 XML
Laith Metadata
Metadata Language
English
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-03-04T11:27:51.925Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
pointOfContact
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 
 

Publishing Body

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