Survey of Invasive Non-Native Species (INNS) at Welsh dredge disposal sites: Milford Haven and the Severn Estuary 2018

  • English
  • wel
  • All

Natural Resources Wales (NRW) contracted Marine Ecological Solutions Ltd. (Marine EcoSol) to analyse species and habitats surveyed in several dredge disposal sites around Wales (Milford Haven, the Severn Estuary, Swansea Bay Outer and Holyhead Deed), and undertake a data and literature review to discuss the potential for marine Invasive Non-Native Species (INNS) transfer via dredge disposal pathways. The purpose of the surveys was to obtain information to inform decision making to minimise further spread of non-native species from dredge disposal.

Identification

Dynodydd
Identifier
NRW_DS122590
Teitl Amgen
Alternative Title
  • NRW_INNS_dredge_disposal_survey_2018
Laith Metadata
Metadata Language
English
Lineage

Towed underwater imagery was collected from dredge disposal sites Milford Haven 2 and 3 comprising video and stills. Grab and trawl samples were collected from Merkur Bouy, Cardiff Grounds and Newport. Marine EcoSol was contracted to analyse towed underwater imagery from the Milford Haven surveys. Video and stills imagery from Milford Haven were analysed for substrates and species (including any INNS), and their habitats classified using the JNCC Marine Habitat Classification system. Photographs of the epibenthic species collected from the Severn Estuary surveys were also re-checked for INNS. All data were entered Marine Recorder v5.4 under the survey name '2018 NRW INNS Dredge Disposal Survey'. Imagery was of varying quality, and small epibenthic trawks and grabs possibly insufficient to pick up the presence of INNS within dredge disposal sites. Methodological limitations are discussed within the associated report, Baldock et al. (2019).
Additional Information

See Baldock, L., Moore, A., Wray, B., Evans, S. and E. Morris-Webb. 2019. Survey of Invasive Non-Native Species (INNS) at Welsh dredge disposal sites: Milford Haven and the Severn Estuary 2018. NRW Report.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2018-09-05
Perchennog
Owner
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Perchennog
Owner
  Marine Ecological Solutions Ltd
Marine Ecological Solutions Ltd, 41 High Street, Menai Bridge, Ynys Mon, LL59 5EF, Wales
http://www.marine-ecosol.co.uk
Cychwynnwr
Originator
 
 

Extent

Extent

Hyd
Geographic Extent
Bridgwater Bay
Hyd
Geographic Extent
Celtic Sea
Hyd
Geographic Extent
Bristol Channel
Hyd
Geographic Extent
Severn Estuary
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword

circalittoral

Maint Fertigol
Vertical Extent

Gwerth lleiaf
Minimum value (metres)
10.5
Gwerth uchaf
Maximum value (metres)
76
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
  • Database ()

    Specification

    Database 2018 NRW INNS Dredge Disposal Survey MRCCW325 NBNData.mdb Documents Baldock et al 2018 Dredge disposal Invasive Non-Native Species (INNS) monitoring report.docx 2018 Dredge Disposal INNS proforma R2.xlsx 2018 INNS Grab & Trawl Survey proforma_R1.xlsx Image Photographs and still images of the seabed

 

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

Towed underwater imagery was collected from dredge disposal sites Milford Haven 2 and 3 comprising video and stills. Grab and trawl samples were collected from Merkur Bouy, Cardiff Grounds and Newport. Marine EcoSol was contracted to analyse towed underwater imagery from the Milford Haven surveys. Video and stills imagery from Milford Haven were analysed for substrates and species (including any INNS), and their habitats classified using the JNCC Marine Habitat Classification system. Photographs of the epibenthic species collected from the Severn Estuary surveys were also re-checked for INNS. All data were entered Marine Recorder v5.4 under the survey name '2018 NRW INNS Dredge Disposal Survey'. Imagery was of varying quality, and small epibenthic trawks and grabs possibly insufficient to pick up the presence of INNS within dredge disposal sites. Methodological limitations are discussed within the associated report, Baldock et al. (2019).
 

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
  • dredging
  • slipper limpet
  • crepidula fornicata
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
  • Habitat characterisation
  • Seabed photography
  • Zoobenthos taxonomic abundance
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

 

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 on 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 Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose. Attribution statement: Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313232353930 XML
Laith Metadata
Metadata Language
English
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2024-05-31T09:22:35.654Z
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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