Survey of the Tentacled Lagoon Worm (Alkmaria romijni) at Carew Castle Mill Pond (2006)
Arolwg o fwydyn tentaclog y morlyn (Alkmaria romijni) ym Mhwll Melin Castell Caeriw

  • English
  • wel
  • All

The tentacled lagoon worm (Alkmaria romijni) is a nationally scarce protected species found in lagoonal habitats in the Pembrokeshire Marine Special Area of Conservation. In Wales it has only been recorded from two saline lagoon sites in Pembrokeshire: Neyland Weir Pool (Westfield Pill) and Carew Castle Mill Pond. Elsewhere in the UK it had been recorded from only a handful of sites in lagoons and estuaries along the English Channel and southern North Sea and internationally between Morocco and the Baltic where it is not uncommon. A. romijni is limited to brackish water habitats and threats to these habitats include agricultural run-off and sewage, coastal development and coastal defence as well as pollution from industrial discharges.

There were three main purposes of this data capture:

- To establish a repeatable baseline survey of the tentacled lagoon worm (Alkmaria romijni) at Carew Castle Mill Pond.

- To undertake a spatial survey of salinity at the sediment-water interface

- To note field observations on the integrity of the inflow/outflow system or any activities at the site that might be considered to have an adverse effect on the integrity of the site as a saline lagoonal habitat.

Identification

Dynodydd
Identifier
NRW_DS110038
Teitl Amgen
Alternative Title
  • 2006 CCW Survey of the tentacled lagoon worm (Alkmaria romijni) at Carew Castle Mill Pond MRCCW30000000040
Laith Metadata
Metadata Language
English
Lineage

Initial survey- A sampling pattern of 20 stations distributed evenly across the whole Mill Pond (stations between 45 and 80m apart), was established prior to the survey using Mapinfo GIS software. The positions derived from the GIS were input into a Garmin handheld GPS in order to enable location of the sampling stations in the field. Once sampling stations had been located , a single grab of the top 20 cm of sediment were taken using a 0.025m2 hand held Ekman grab. Once the grab arrived at the surface, a sample of the water draining out of the grab was put in a pot for later determination of the salinity at the sediment surface. The grab samples were then sieved through a 0.5 mm mesh until most of the fines had been washed away. The sieved sample was then placed in a labelled bucket and topped up with water from the Mill Pond. Samples were taken back to the laboratory. The number of Alkmaria romijni worms together with other species found in the samples were counted. The salinity of the water samples collected from the grabs determined using an Atago hand-hand refractometer. Follow up survey- a sampling technique was adopted following the principles of Adaptive Cluster Sampling (ACS), in which sampling effort is modified in response to observations made during the course of the survey. Initial survey 27 February 2006 follow up survey 15 March 2006.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2006-11-30

Temporal Extent

Begin date
2006-02-17
End date
2006-03-15
 
Categori pwnc
Topic category
  • Biota
    Biota
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Aquatic Survey and Monitoring Ltd (ASML) -
Whitfield Brow, Bollihope, Frosterley, Weardale, Co. Durham, DL13 2SZ, England
http://www.marineseen.com/aquatic_survey_and_monitoring.htm
 

Extent

Extent

Hyd
Geographic Extent
SIR BENFRO - PEMBROKESHIRE
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword

soil and sediment
 
 

Distribution

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

    Specification

    [A] Digital version of contract report- Word document. [B] Survey results- Marine recorder (MRCCW30000000040 / MRCCW3000000007B)

 

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

Initial survey- A sampling pattern of 20 stations distributed evenly across the whole Mill Pond (stations between 45 and 80m apart), was established prior to the survey using Mapinfo GIS software. The positions derived from the GIS were input into a Garmin handheld GPS in order to enable location of the sampling stations in the field. Once sampling stations had been located , a single grab of the top 20 cm of sediment were taken using a 0.025m2 hand held Ekman grab. Once the grab arrived at the surface, a sample of the water draining out of the grab was put in a pot for later determination of the salinity at the sediment surface. The grab samples were then sieved through a 0.5 mm mesh until most of the fines had been washed away. The sieved sample was then placed in a labelled bucket and topped up with water from the Mill Pond. Samples were taken back to the laboratory. The number of Alkmaria romijni worms together with other species found in the samples were counted. The salinity of the water samples collected from the grabs determined using an Atago hand-hand refractometer. Follow up survey- a sampling technique was adopted following the principles of Adaptive Cluster Sampling (ACS), in which sampling effort is modified in response to observations made during the course of the survey. Initial survey 27 February 2006 follow up survey 15 March 2006.
 

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
  • tentacled lagoon worm
  • marine and freshwater inventory
  • lagoonal
  • lagoons
  • Pembrokeshire Marine SAC
  • alkmaria romijni
  • Carew Castle mill pond
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2026-08-27
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
 

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

A survey of the tentacled lagoon worm (alkmaria romijni) at carew castle mill pond 2006: field report
 

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 2006 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
4f4c4942-4343-5764-6473-313130303338 XML
Laith Metadata
Metadata Language
English
Parent Identifier
Natural Resources Wales (NRW) Marine Benthic Species and Habitat Collation Held in Marine Recorder

NRW_DS114501
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-09-28T11:50:33.047Z
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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