4f4c4942-4343-5764-6473-313631333438 English Natural Resources Wales Maes y Ffynnon Bangor LL57 2DW Wales opendata@cyfoethnaturiolcymru.gov.uk 2026-01-20T10:00:29.486Z NRW 1.0 wel British National Grid (EPSG:27700) Eryri Montane Lake Bryophyte Survey 2024 Eryri Montane Lake Bryophyte Survey 2024 2025-02-25 2025-02-25 NRW_DS161348 Rocks along the shores of montane lakes in Eryri have been found to be an important bryophyte habitat, supporting a range of rare and threatened bryophytes that grow only in this habitat. Due to the limited niche of the species of this habitat, and in some cases very small populations, they are especially vulnerable to disturbance and a single disturbance event could lead to irreparable damage to or even loss of the Welsh population of some species. Therefore, it is of high importance to fully document the bryophyte flora of the shores of these montane lakes and identify rocks that support rare and important bryophytes and are vulnerable to disturbance. Seven montane lakes within the Eryri SSSI were surveyed in September 2024, spread between the three main massifs of Yr Wyddfa, Glyderau and Carneddau. Lakes were prioritised for survey based on the quality and quantity of recent bryophyte records. The full shore of each lake was walked and the locations of any rare or otherwise notable bryophytes encountered were recorded. Important boulders were identified and documented, with any damage present noted. A full species list was recorded from the shore of each lake. Rocks along the shores of montane lakes in Eryri have been found to be an important bryophyte habitat, supporting a range of rare and threatened bryophytes that grow only in this habitat. Due to the limited niche of the species of this habitat, and in some cases very small populations, they are especially vulnerable to disturbance and a single disturbance event could lead to irreparable damage to or even loss of the Welsh population of some species. Therefore, it is of high importance to fully document the bryophyte flora of the shores of these montane lakes and identify rocks that support rare and important bryophytes and are vulnerable to disturbance. Seven montane lakes within the Eryri SSSI were surveyed in September 2024, spread between the three main massifs of Yr Wyddfa, Glyderau and Carneddau. Lakes were prioritised for survey based on the quality and quantity of recent bryophyte records. The full shore of each lake was walked and the locations of any rare or otherwise notable bryophytes encountered were recorded. Important boulders were identified and documented, with any damage present noted. A full species list was recorded from the shore of each lake. 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 Nimbosa Ecology N/A N/A rlhodd@gmail.com http://www.botanicalenvironmental.com/staff-3/ WWW:LINK-1.0-http--link Habitats and biotopes GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Bryophyte monitoring Eryri inland waters NRW Thesaurus 2026-01-16 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 only be re-used externally under provision and in line with the terms of a NRW licence following an assessment of the data. Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Open Government Licence English biota Wales (WLS) -4.3303 -3.4096 52.501 53.2187 2024-09-01 2024-09-13 Hodd, R.L. 2025. A survey of the bryophytes of the montane lakes of Eryri. NRW Evidence Report No: 879, 96pp, Natural Resources Wales. Delimited Unknown Excel Spreadsheet Documents Unknown NRW Evidence Report in 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 The field survey was undertaken over the course of five days between the 9th and 13th of September 2024. One site was visited on each day, resulting in the survey of a total of seven lakes, as three lakes are located within Cwm Clogwyn on Yr Wydffa, so could all be surveyed in one day. The field survey was undertaken over the course of five days between the 9th and 13th of September 2024. One site was visited on each day, resulting in the survey of a total of seven lakes, as three lakes are located within Cwm Clogwyn on Yr Wydffa, so could all be surveyed in one day.