Assessment of the Impact of Hydraulic Cockle Dredging on the Macroinvertebrate Faunas of Traeth Lafan (1993-1994)

  • English
  • wel
  • All

This dataset contains the results of a macroinvertebrate and sediment survey conducted post hydraulic cockle dredging around Traeth Lafan, North Wales. The purpose of this data collection was to study the effects of hydraulic suction dredging on benthic invertebrate macrofaunas, substrate conformation and sediment composition on Traeth Lafan. The survey was located at Traeth Lafan, the northern entrance to the Menai Strait (Menai Strait and Colwyn Bay Special Area of Conservation (SAC)). A survey of the macroinvertebrates and sediments of Traeth Lafan, North Wales, was undertaken following extensive hydraulic cockle dredging in autumn 1993. The survey covered the site allocated for dredging and part of the hand gathering area, which was used as 'control', against which changes on the dredged ground could be compared. A follow up survey, using the same sampling grid and rationale, was carried out twelve months later, in November 1994, to ascertain the recovery state of the area after a full season's recruitment.

Identification

Dynodydd
Identifier
NRW_DS110069
Teitl Amgen
Alternative Title
  • 1993-94 CCW Traeth Lafan hydraulic dredging impact survey JNCCMNCR40000693
  • Asesiad o effaith cribinio hydrolig am gocos ar ffawna macroinfertebratau Traeth Lafan (1993-1994)
Laith Metadata
Metadata Language
English
Lineage

The survey consisted of a widespread survey using a grid of single sample stations and an intensive survey of four stations with replicate sampling, deployed across the dredged area. Both the single survey grid and one replicate station covered an area of 'control' ground allocated to hand gathering. 0.01m-2 x 0.2 sediment cores were collected at each sampling station and surface evidence of deeper burrowing animals was recorded. A sample was taken of the surface sediment for granulometric analysis, substrate shear strength was measured and the presence of other physical features recorded. Samples were sent to the laboratory for analysis. There is a high confidence in this data, however no spatial reference were provided with data for statistical analysis. It is assumed for the purpose of the metadata that samples were collected using Latitude and Logitude (WGS84). The post disturbance ecological survey was carried out on 12th December 2003 and 8th January 2004 with the follow up survey undertaken on the 28th and 29th of December 1994. Confidence in this dataset is high, however no spatial reference were provided with data for statistical analysis. It is assumed for the purpose of the metadata that samples were collected using Latitude and Logitude (WGS84).
Additional Information

There is an associated report to accompany this dataset: P.Allen., CCW. 1995 An assessment of the impact of hydraulic cockle dredging on the macroinvertebrate faunas of Traeth Lafan, North Wales CCW Science Report No. 64. Bangor.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
1995-03-31
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=/
Cychwynnwr
Originator
  North Western And North Wales Sea Fisheries Committee = Pwllgor Pysgodfeydd Mor Gogledd Orllewin Lloegr a Gogledd Cymru
1 Preston Street, Carnforth, Lancashire, LA5 9BY, England
http://www.nwnwsfc.org/
 

Extent

Extent

Hyd
Geographic Extent
SIR YNYS MON - ISLE OF ANGLESEY
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

Maint Fertigol
Vertical Extent

Gwerth lleiaf
Minimum value (metres)
3.5
Gwerth uchaf
Maximum value (metres)
3.5
System Gyfeirio Cydlynu Fertigol
Vertical CRS
urn:ogc:def:datum:EPSG::5100 Sea Level depth is unadjusted and does not take into account tidal height
 
 

Distribution

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

    Specification

    [A] Report is held as a .pdf file, data is held as .SAM and .WPS files. [B] Floppy disk 1 398KB (WPS files) [C] Floppy disk 2 575KB (SAM files) [D] Report- scanned copy in PDF format [E] Survey data in Marine Recorder (JNCCMNCR40000693)

 

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 survey consisted of a widespread survey using a grid of single sample stations and an intensive survey of four stations with replicate sampling, deployed across the dredged area. Both the single survey grid and one replicate station covered an area of 'control' ground allocated to hand gathering. 0.01m-2 x 0.2 sediment cores were collected at each sampling station and surface evidence of deeper burrowing animals was recorded. A sample was taken of the surface sediment for granulometric analysis, substrate shear strength was measured and the presence of other physical features recorded. Samples were sent to the laboratory for analysis. There is a high confidence in this data, however no spatial reference were provided with data for statistical analysis. It is assumed for the purpose of the metadata that samples were collected using Latitude and Logitude (WGS84). The post disturbance ecological survey was carried out on 12th December 2003 and 8th January 2004 with the follow up survey undertaken on the 28th and 29th of December 1994. Confidence in this dataset is high, however no spatial reference were provided with data for statistical analysis. It is assumed for the purpose of the metadata that samples were collected using Latitude and Logitude (WGS84).
 

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
  • Lafan sands (Lavan sands)(Traeth Lafan)
  • Menai Strait
  • cockle dredging (hydraulic dredging)
  • macroinvertebrates
  • benthic species
  • sediments
  • marine and freshwater inventory
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
  • Shellfish abundance and biomass in water bodies
  • Fishery characterisation
  • Sedimentary structure
  • Sediment grain size parameters
Math
Type
Theme
Theme

Dyfyniad
Citation

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

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

An assessment of the impact of hydraulic cockle dredging on the macroinvertebrate faunas of Traeth Lafan, North Wales
 

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. CCW may release, publish or disseminate it freely.
 

Use Constraints

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© CCGC/CCW 1995. 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 CCW'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
4f4c4942-4343-5764-6473-313130303639 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
2024-12-09T12:37:49.341Z
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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