4f4c4942-4343-5764-6473-313131313436 English NRW_DS114501 Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2026-03-03T12:40:26.294Z NRW 1.0 wel British National Grid (EPSG::27700) Results of a Study into the Use of a Phase 2 Sampling Grid as a Monitoring Strategy for the Mawddach Estuary. (1999 CCW Marine Monitoring trials) Results of a Study into the Use of a Phase 2 Sampling Grid as a Monitoring Strategy for the Mawddach Estuary. (1999 CCW Marine Monitoring trials) Canlyniadau astudiaeth ar ddefnyddio grid samplu cam 2 fel strategaeth fonitro yn aber Mawddach 1999 CCW/NWNWSFC Mawddach Estuary littoral survey JNCCMNCR40000739 2001-04-30 NRW_DS111146 The aim of this survey was to investigate the feasibility of using a phase 2 sampling grid methodology to determine the proportion of muddy and sandy communities and the distribution of major communities within the estuary. 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. This dataset contains the results of a survey carried out to trial a sampling strategy and methodology that addresses two of these attributes: - The relative proportion of muddy and sandy communities. - The distribution of major communities within the estuary. The aim of this survey was to investigate the feasibility of using a phase 2 sampling grid methodology to determine the proportion of muddy and sandy communities and the distribution of major communities within the estuary. 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. This dataset contains the results of a survey carried out to trial a sampling strategy and methodology that addresses two of these attributes: - The relative proportion of muddy and sandy communities. - The distribution of major communities within the estuary. 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=/ 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 Phase 2 Survey (Phase II) Mawddach Estuary monitoring (see specific types of monitoring eg. woodland monitoring) Pen Llyn a'r Sarnau SAC NRW Thesaurus 2025-01-08 geonetwork.thesaurus.local.theme.converted_nrw-keywords Zoobenthos generic abundance Zoobenthos taxonomic abundance 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) -4.1989998 -3.88192773 52.62710419 52.80345153 SeaVoX Vertical Co-ordinate Coverages 2013-02-05 creation benthic boundary layer 1999-09-08 1999-10-13 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] The data on species, sediment analysis, biotope etc are recorded on paper MNCR forms and held in Marine Recorder. Documents The results are also presented in a hardcopy report format Geographic Information System Spatial data is held as MapInfo GIS files. 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 MapInfo was used to set up an evenly spaced grid of sampling stations across the whole estuary, from high water springs to low water springs. The grid was scaled to allow for at least five sampling stations on each of the major intertidal biotopes (this done using the 1997 Marine Intertidal Phase 1 map of the estuary). An extra 30 sample stations were added to account for 'minor' biotopes not already covered by the grid. At each sample station (saltmarsh was not sampled) sediment surface features and conspicuous species were noted. Eight cores were collected from each sample station. These 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 granulometrc data were then processed to identify the biotopes. MapInfo was used to set up an evenly spaced grid of sampling stations across the whole estuary, from high water springs to low water springs. The grid was scaled to allow for at least five sampling stations on each of the major intertidal biotopes (this done using the 1997 Marine Intertidal Phase 1 map of the estuary). An extra 30 sample stations were added to account for 'minor' biotopes not already covered by the grid. At each sample station (saltmarsh was not sampled) sediment surface features and conspicuous species were noted. Eight cores were collected from each sample station. These 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 granulometrc data were then processed to identify the biotopes.