4f4c4942-4343-5764-6473-313631333133 English Natural Resources Wales Maes y Ffynnon Bangor LL57 2DW Wales opendata@cyfoethnaturiolcymru.gov.uk 2025-03-10T15:52:17.273Z NRW 1.0 wel British National Grid (EPSG:27700) A survey to determine the status of the Depressed River Mussel Pseudanodonta complanata at eight monitoring stations within the River Wye (Lower Wye) SSSI in 2022 A survey to determine the status of the Depressed River Mussel Pseudanodonta complanata at eight monitoring stations within the River Wye (Lower Wye) SSSI in 2022 2024-11-01 NRW_DS161313 Data from a survey of the River Wye taken over a 3 day period from August 17th - 19th 2022. Sampling methodology followed that established in the previous survey in 2007, with eight monitoring sites visited from Backney Common (north of Ross-on-Wye) downstream to Bigsweir covering a 50km stretch of the River Wye. At each site, 60-minute visual surveys were undertaken in the river using a bathyscope to spot mussels buried in sediments or dislodged from them using a pronged rake. The number of mussels located during that period were counted, measured, photographed and then returned to the river. Data from a survey of the River Wye taken over a 3 day period from August 17th - 19th 2022. Sampling methodology followed that established in the previous survey in 2007, with eight monitoring sites visited from Backney Common (north of Ross-on-Wye) downstream to Bigsweir covering a 50km stretch of the River Wye. At each site, 60-minute visual surveys were undertaken in the river using a bathyscope to spot mussels buried in sediments or dislodged from them using a pronged rake. The number of mussels located during that period were counted, measured, photographed and then returned to the river. 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 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 Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Species distribution GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme mussels River Wye (Afon Gwy) NRW Thesaurus 2025-01-08 geonetwork.thesaurus.local.theme.converted_nrw-keywords There are no access restrictions on this data. NRW may release, publish or disseminate it freely. noLimitations © 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. Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Open Government Licence English biota Wales (WLS) -2.9355 -2.456 51.6589 51.9553 2024-08-17 2024-08-19 Willing, M.J. 2024. A survey to determine the status of the Depressed River Mussel Pseudanodonta complanata at eight monitoring stations within the River Wye (Lower Wye) SSSI in 2022. NRW Evidence Report No. 846. 47pp. Natural Resources Wales, Bangor. Delimited Data Stored on WID Database 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 Experience gained by the contractor during the 2007 P. complanata survey were adopted to take account of the particular behaviours of the mussel in the Lower Wye. These included their relative scarcity, patchy distribution and habit of living deeply buried (often in small groups) in coarse sand between gravel and cobbles. Search technique involved the use of a bathyscope (‘glass-bottomed bucket’) to visually search the riverbed whilst wading in water depths to about 1.2m whilst wearing chest waders and a flotation aid. Experience gained by the contractor during the 2007 P. complanata survey were adopted to take account of the particular behaviours of the mussel in the Lower Wye. These included their relative scarcity, patchy distribution and habit of living deeply buried (often in small groups) in coarse sand between gravel and cobbles. Search technique involved the use of a bathyscope (‘glass-bottomed bucket’) to visually search the riverbed whilst wading in water depths to about 1.2m whilst wearing chest waders and a flotation aid.