A study of the Milford Haven maerl bed (2005)

  • English
  • wel
  • All

Maerl beds are a UK Biodiversity Action Plan (BAP) habitat and are also included in the biodiversity duty of public bodies introduced by the NERC Act 2006. Maerl is a collective term for several species of red seaweed, with hard, chalky skeletons. It is rock hard and, unlike other seaweeds, it grows as unattached rounded nodules or short, branched shapes on the seabed. Maerl beds are an important habitat for many different types of marine life, which live amongst or are attached to the surface of Maerl, or burrow in the coarse gravel of dead maerl beneath the top living layer. Maerl beds can be of importance to sustainable fisheries, providing nursery grounds for commercial species of fish and shellfish. In Milford Haven the maerl species Phymatolithon calcareum forms the only living maerl bed in Wales. P. calcareum is listed in the EC Habitats Directive Annex Vb. The aim of this project was to collate high quality images of the Milford Haven maerl bed to create a base line for long term monitoring for Biodiversity Action Plan reporting. There is high confidence in this dataset as the surveyors are amongst the most experienced marine biologists in the UK.

Identification

Dynodydd
Identifier
NRW_DS101780
Teitl Amgen
Alternative Title
  • 2005 CCW study of the Milford Haven Maerl Bed MRCCW16500000002
  • Astudiaeth ar wely marl Aberdaugleddau yn 2005
Laith Metadata
Metadata Language
English
Lineage

The first phase of the fieldwork was to map the extent of the maerl bed in Milford Haven and to determine the distribution and abundance of live maerl using drop down video. The second phase of the fieldwork was detailed study at six sites by divers who recorded the frequency of occurrence of macrobiota in a series of quadrats. At four of the sites, core samples were collected for infaunal and sediment particle size analysis. The present study follows on from work completed in May 2004 (RPS, 2004). RPS carried out an exploratory survey of the maerl bed in Milford Haven waterway in the vicinity of Herbrandston jetty on behalf of South Hook Liquid Natural Gas Terminal Company Ltd (South Hook LNG). This was the most comprehensive work on this maerl bed to date but the survey was partial and significant data gaps remained. The present study was designed to use a similar methodology to that used by RPS and to build on the existing data collected to give a better picture of the extent and quality of the maerl within the Milford Haven waterway.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2007-02-28
Perchennog
Owner
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Bunker
MarineSeen, Estuary Cottage, Bentlass, Hundleton, Pembrokeshire, SA71 5RN
http://www.marineseen.com/
Cychwynnwr
Originator
  South Hook LNG Terminal Company Ltd
Dale Road, Herbrandston, Milford Haven, Pembrokeshire, SA73 3SU
http://www.southhooklng.co.uk
 

Extent

Extent

Hyd
Geographic Extent
Irish Sea
Hyd
Geographic Extent
St. Brides Bay
Hyd
Geographic Extent
SIR BENFRO - PEMBROKESHIRE
Hyd
Geographic Extent
Wales (WLS)
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword
benthic boundary layer
 
 

Distribution

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

    Specification

    [A] Data is held as video footage [B] Excel spreadsheets [C] Marine Recorder (MRCCW16500000002) [D] Spatial TAB files [E] JPEG images [F] The final report is held in both a Word document and as a .pdf

 

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
Degree
false
Lineage

The first phase of the fieldwork was to map the extent of the maerl bed in Milford Haven and to determine the distribution and abundance of live maerl using drop down video. The second phase of the fieldwork was detailed study at six sites by divers who recorded the frequency of occurrence of macrobiota in a series of quadrats. At four of the sites, core samples were collected for infaunal and sediment particle size analysis. The present study follows on from work completed in May 2004 (RPS, 2004). RPS carried out an exploratory survey of the maerl bed in Milford Haven waterway in the vicinity of Herbrandston jetty on behalf of South Hook Liquid Natural Gas Terminal Company Ltd (South Hook LNG). This was the most comprehensive work on this maerl bed to date but the survey was partial and significant data gaps remained. The present study was designed to use a similar methodology to that used by RPS and to build on the existing data collected to give a better picture of the extent and quality of the maerl within the Milford Haven waterway.
 

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
  • maerl beds
  • Video survey
  • divers
  • underwater conservation
  • underwater photography
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2023-12-31
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Allweddair
Keywords

SeaDataNet Parameter Discovery Vocabulary
  • Zoobenthos taxonomic abundance
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Adolygu)
Date (Revision)
2021-01-06
Code
geonetwork.thesaurus.external.theme.rdf+xml

Allweddair
Keywords

Integrated Public Sector Vocabulary
  • diving
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Adolygu)
Date (Revision)
2013-04-03
Code
geonetwork.thesaurus.external.theme.subjects
 

Spatial Reference System

Code
Latitude and Longitude (EPSG::4326)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

NRW Related Title

A study of the Milford Haven maerl bed in 2005 using drop down video and diving
 

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

The following data is considered OS derived data and is therefore jointly owned by NRW and the Ordnance Survey. There are no access restrictions on this data. However there are third party use restrictions.
 

Use Constraints

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© CNC/NRW and © Crown copyright. All rights reserved. Natural Resources Wales, AC0000849444 Data may be re-used under provision and in line with the terms of a NRW licence. Those seeking commercial re-use require a commercial licence available from the OS.
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313031373830 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
2024-12-09T12:39:39.576Z
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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