Intertidal Monitoring of Muddy Gravel in Pen Llyn a'r Sarnau Special Area of Conservation (SAC) 2007

The purpose of this data capture was to carry out a repeat survey of sites previously surveyed to further test and develop monitoring methodology and collect monitoring data. In fully marine conditions on the lower shore, sheltered muddy gravel habitats can be particularly species rich due to the complex nature of the substratum supporting a high diversity of infauna and epifauna. Analysis of survey records held on the Marine Nature Conservation Review (MNCR) database suggest that fully saline sheltered muddy gravel communities are scarce in their British distribution, with available descriptions lacking detail and comprehensive data. This has been attributed to the habitats being difficult to survey and monitor, due to the large quantities of coarse material which require sampling and subsequent analysis. Similarly, historical data on the distribution of muddy gravel beds appears limited. This data set includes results of sediment coring and sampling undertaken at one site in Porthmadog during intertidal monitoring of the muddy gravel in Pen Llyn a'r Sarnau Special Area of Conservation (SAC).

Identifier: NRW_DS111183

Alternative Title

2007 CCW / ASML Pen Llyn ar' Sarnau SAC Muddy gravel monitoring, Dwyryd/Glaslyn MRCCW1630000000A
Gwaith monitro rhynglanwol ar raean lleidiog yn ACA Pen Llyn a'r Sarnau yn 2007

Metadata Language: English

Lineage: Five core samples were taken using a 0.01m2 corer. The cores were taken within a radius of approximately 5 m from the central mark; and randomly placed without reference to the surface features (with eyes closed). Each core was then sieved over a 0.5 mm mesh and the sieve contents transferred to a suitable labelled pot or plastic bag. These samples were then taken back to the field survey base and preserved in 10% formalin. A sample of the sediment was also taken from each station for granulometry analysis. The sample was usually taken from the side of one of the corer holes, to a depth of at least 5cm, and placed in a labelled plastic bag. Samples for macrofauna and granulometry analyses were given to CCW for later transfer to an analytical laboratory. The confidence in this data is high as the surveys were carried out by a team of highly experienced intertidal surveyors.

Dataset Reference Date (Publication): 2009-03-31

Temporal Extent

Begin date: 2007-08-31

End date: 2007-08-31

Topic category

Oceans
Biota

Owner

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

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

Geographic Extent: Wales (WLS)

Vertical Extent

Medin Extent Keyword: benthic boundary layer; soil and sediment

Format Type and Description

Documents Documents ()

Specification

[A] Digital versions of the contract report: Microsoft Word document(s); and an equivalent Adobe Portable Document Format version [B] Excel Spreadsheets of data: - Dyfi Marine Recorder Spp Data 2007 V4.xls - HEBOG1730_Dyfi_ infauna_2007.xls [C] A series of MapInfo GIS layers in MapInfo Native format (Tables).Translations from the MapInfo Tables are retained in ESRI Shapefile and MapInfo Interchange formats.: [D] Marine Recorder files: MRCCW1630000000A [E] Photographs of the site, sediment characteristics, core contents and quadrats.

Data quality

Quality Scope: Dataset

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: Five core samples were taken using a 0.01m2 corer. The cores were taken within a radius of approximately 5 m from the central mark; and randomly placed without reference to the surface features (with eyes closed). Each core was then sieved over a 0.5 mm mesh and the sieve contents transferred to a suitable labelled pot or plastic bag. These samples were then taken back to the field survey base and preserved in 10% formalin. A sample of the sediment was also taken from each station for granulometry analysis. The sample was usually taken from the side of one of the corer holes, to a depth of at least 5cm, and placed in a labelled plastic bag. Samples for macrofauna and granulometry analyses were given to CCW for later transfer to an analytical laboratory. The confidence in this data is high as the surveys were carried out by a team of highly experienced intertidal surveyors.

Keywords

GEMET - INSPIRE themes, version 1.0

Type: Theme

Citation

Date (Publication): 2008-06-01

Code: geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus

Pen Llyn a'r Sarnau SAC
Special Areas of Conservation (SAC) (see also Candidate Special Areas of Conservation cSAC)
Special Areas of Conservation (SAC) - SAC monitoring
intertidal
muddy gravel
river Glaslyn (afon Glaslyn)

Type: Theme

Citation

Date (Publication): 2023-12-31

Code: geonetwork.thesaurus.local.theme.converted_nrw-keywords

Keywords

SeaDataNet Parameter Discovery Vocabulary

Habitat characterisation
Zoobenthos taxonomic abundance
Zoobenthos generic abundance
Sedimentary structure

Type: Theme

Citation

Date (Revision): 2021-01-06

Code: geonetwork.thesaurus.external.theme.rdf+xml

Code: British National Grid (EPSG::27700)

Content Information

NRW Profile

Custom Elements

NRW Related Title: Intertidal monitoring of Pen Llyn a'r Sarnau SAC August 2007

Constraints

Limitations on Public Access and Use

Restriction type: 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. NRW may release, publish or disseminate this data freely; providing recipients are made aware of use restrictions (See general use restrictions).

Use Constraints

Use constraints type: Other restrictions

Other constraints: © CNC/NRW and © Crown copyright 2009. All rights reserved. Natural Resources Wales, AC0000849444 Third parties seeking to re-use this data require a Licence issued by NRW. It allows re-use, reproduction and dissemination in any format or medium but only for non-commercial purposes, according to the terms and conditions of the Licence. Those seeking commercial re-use require a commercial licence available from the OS.

Metadata

File Identifier: 4f4c4942-4343-5764-6473-313131313833 XML

Metadata Language: English

Parent Identifier: Natural Resources Wales (NRW) Marine Benthic Species and Habitat Collation Held in Marine Recorder
NRW_DS114501

Resource type: Dataset

Metadata Date: 2024-05-31T09:27:29.173Z

Metadata Standard Name: NRW

Metadata Standard Version: 1.0

pointOfContact

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Publishing Body

Access the portal

Full access to the portal and metadata.

Intertidal Monitoring of Muddy Gravel in Pen Llyn a'r Sarnau Special Area of Conservation (SAC) 2007

Identification

Temporal Extent

Extent

Extent

Vertical Extent

Distribution

Quality

Data quality

Keywords

Keywords

Citation

Keywords

Citation

Keywords

Citation

Spatial Reference System

Content

Content Information

NRW Profile

Custom Elements

Constraints

Constraints

Limitations on Public Access and Use

Access Constraints Directive

Access Constraints Text

Use Constraints

Metadata

Metadata

Publishing Body