4f4c4942-4343-5764-6473-313131313434 English NRW_DS114501 Master Reference Data Team Natural Resources Wales, Maes y Fynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW enquiries@naturalresourceswales.gov.uk http://naturalresourceswales.gov.uk/splash?orig=/ 2026-03-03T12:00:19.81Z NRW 1.0 wel British National Grid (EPSG::27700) Results of a Study into the Use of Transects to Identify the Broad-Scale Attributes of the Mawddach Estuary. (1999 CCW Marine Monitoring Trials) Results of a Study into the Use of Transects to Identify the Broad-Scale Attributes of the Mawddach Estuary. (1999 CCW Marine Monitoring Trials) Canlyniadau astudiaeth ar ddefnyddio trawsluniau i nodi priodoleddau aber Mawddach The potential use of transects to provide an index of the borad-scale attributes of the Mawddach Estuary 1999 CCW Mawddach estuary littoral monitoring trial JNCCMNCR40000795 2001-04-30 NRW_DS111144 The purpose of this data capture was to investigate the feasibility of using a transect based methodology to determine the proportion of muddy communities and the zonation of muddy communities from upper to lower shore. The Mawddach is one of the best examples of a small, drying, bar-built estuary in Britain and, with its mountainous catchment area it has some of the lowest nutrient inputs in Wales. In order to be able to report on the condition of the estuary a number of attributes have been identified which require monitoring. The aims of this project was to investigate the feasibility of using a transect based methodology to determine the proportion of muddy communities and the zonation of muddy communities from upper to lower shore. The purpose of this data capture was to investigate the feasibility of using a transect based methodology to determine the proportion of muddy communities and the zonation of muddy communities from upper to lower shore. The Mawddach is one of the best examples of a small, drying, bar-built estuary in Britain and, with its mountainous catchment area it has some of the lowest nutrient inputs in Wales. In order to be able to report on the condition of the estuary a number of attributes have been identified which require monitoring. The aims of this project was to investigate the feasibility of using a transect based methodology to determine the proportion of muddy communities and the zonation of muddy communities from upper to lower shore. Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Various contractors See Natural Resources Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresourceswales.gov.uk/splash?orig=/ CCW Marine Monitoring Team Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW enquiries@naturalresourceswales.gov.uk http://naturalresourceswales.gov.uk/splash?orig=/ Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Habitats and biotopes GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Pen Llyn a'r Sarnau SAC mud Mawddach Estuary transect (transects) (transect profile) (transect profiles) monitoring (see specific types of monitoring eg. woodland monitoring) biotopes NRW Thesaurus 2025-01-08 geonetwork.thesaurus.local.theme.converted_nrw-keywords Habitat characterisation Habitat extent SeaDataNet Parameter Discovery Vocabulary 2024-06-19 geonetwork.thesaurus.external.theme.rdf+xml There are no access restrictions to this data. NRW may release, publish or disseminate it freely. no limitations © CNC/NRW 2001 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. Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Open Government Licence English biota GWYNEDD - GWYNEDD Wales (WLS) -4.1183757 -3.67394794 52.65645792 52.80534096 SeaVoX Vertical Co-ordinate Coverages 2013-02-05 creation benthic boundary layer 1999-09-25 1999-09-29 Senior Marine Monitoring Ecologist, Marine and Freshwater Science Group, NRW. This trialling work is a precursor to the intertidal monitoring carried out on the estuary in 2004 (see separate metadata entry) and is part of the LIFE trials, section 3.4.3 of the Monitoring Report. Sanderson, WG., Holt, RHF., Kay, L., yn, G., McMath, AJ. 2001. The establishment of a programme of surveillance and monitoring for judging the condition of the features of Pen Llyn a’r Sarnau cSAC: 1. Progress to March 2001. Countryside Council for Wales Science Report 380. Bangor. The establishment of a programme of surveillance and monitoring for judging the condition of the features of Pen Llyn a'r Sarnau cSAC : 1. Progress to March 2001 Database [A] Species data is held within Marine Recorder. [B] MNCR forms are held in hardcopy format. Documents Evidence Report in MS Word or PDF Format 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 2010-12-08 This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false Four transects were established to cover the majority of saltmarsh and intertidal biotopes present. Groups of core samples were collected at 25 m intervals along the transect. At each sample point sediment surface features and profile were described and photographed and the conspicuous species and morphological characteristics noted. The eight cores collected from each sample station were pooled and the infauna subsequently processed. The fauna present, identified to species level, were recorded on a spreadsheet as were the results of analysis of particle size characteristics of the granulomatric sample. The infaunal and granulometric data were then processed to identify the biotopes. Four transects were established to cover the majority of saltmarsh and intertidal biotopes present. Groups of core samples were collected at 25 m intervals along the transect. At each sample point sediment surface features and profile were described and photographed and the conspicuous species and morphological characteristics noted. The eight cores collected from each sample station were pooled and the infauna subsequently processed. The fauna present, identified to species level, were recorded on a spreadsheet as were the results of analysis of particle size characteristics of the granulomatric sample. The infaunal and granulometric data were then processed to identify the biotopes.