4f4c4942-4343-5764-6473-313135383936 English 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=/ 2025-03-07T16:57:30.791Z NRW 1.0 wel British National Grid (EPSG::27700) Monitoring invertebrates by finger searching and pitfall trapping after excavation of the surface vegetation in three slacks at Newborough Warren - Ynys Llanddwyn SSSI (2014). Monitoring invertebrates by finger searching and pitfall trapping after excavation of the surface vegetation in three slacks at Newborough Warren - Ynys Llanddwyn SSSI (2014). Monitro creaduriaid di-asgwrn-cefn trwy chwilio â bysedd a defnyddio trapiau pydew ar ôl palu'r llystyfiant ar wyneb y tir ar dri o laciau yn Nhywyn Niwbwrch - SoDdGA Ynys Llanddwyn (2014). 2015-03-01 NRW_DS115896 The purpose of this data capture was to monitor the colonisation of excavated inland dune slacks by specialist pioneer invertebrates on Newborough Warren National Nature Reserve (NNR). This monitoring data was a continuation of the work undertaken in 2013. All invertebrates captured in the taxa Orthoptera, Heteroptera, Auchenorrhyncha, Coleoptera, Aculeata, Diplopoda, Chilopoda, Araneae and Opiliones were identified and counted. The numbers of the individual species are recorded in tables after being corrected for trapping effort. There was little evidence of any change from 2013 in the fauna on the exposed dune habitat. In the slack habitat exposed by excavation, a marked increase in the abundance of the rove beetle Bledius subniger was revealed by finger searching and mapping the distribution of its casts. Pitfall trapping in Slack 4 also revealed the abundance of the ground beetles Dyschirius impunctipennis and D. politus that are known predators of B. subniger. Another ground beetle, Bembidion pallidipenne, characteristic of embryonic slack habitat, was also abundant. It is tentatively concluded that this fauna has greatly increased, probably from breeding in 2013. Some observations are given to illustrate the bias inherent in pitfall trapping and the danger of too easily comparing abundance between species that are caught in pitfalls. There seemed to be no detectable increase in species of Heterocerus and Dryops. Slack 4 had two distinct areas of slack habitat that had been created by the excavation. In the southern part, there was a higher organic content in the soil and greater plant cover and diversity. This contrasted with the northern part which had little plant cover and a low organic content in the soil. These differences were reflected in a marked difference in the fauna of the two areas. The southern half contained species found in the unexcavated slacks that appear to require some shade but were probably eliminated from the other excavated slacks. The purpose of this data capture was to monitor the colonisation of excavated inland dune slacks by specialist pioneer invertebrates on Newborough Warren National Nature Reserve (NNR). This monitoring data was a continuation of the work undertaken in 2013. All invertebrates captured in the taxa Orthoptera, Heteroptera, Auchenorrhyncha, Coleoptera, Aculeata, Diplopoda, Chilopoda, Araneae and Opiliones were identified and counted. The numbers of the individual species are recorded in tables after being corrected for trapping effort. There was little evidence of any change from 2013 in the fauna on the exposed dune habitat. In the slack habitat exposed by excavation, a marked increase in the abundance of the rove beetle Bledius subniger was revealed by finger searching and mapping the distribution of its casts. Pitfall trapping in Slack 4 also revealed the abundance of the ground beetles Dyschirius impunctipennis and D. politus that are known predators of B. subniger. Another ground beetle, Bembidion pallidipenne, characteristic of embryonic slack habitat, was also abundant. It is tentatively concluded that this fauna has greatly increased, probably from breeding in 2013. Some observations are given to illustrate the bias inherent in pitfall trapping and the danger of too easily comparing abundance between species that are caught in pitfalls. There seemed to be no detectable increase in species of Heterocerus and Dryops. Slack 4 had two distinct areas of slack habitat that had been created by the excavation. In the southern part, there was a higher organic content in the soil and greater plant cover and diversity. This contrasted with the northern part which had little plant cover and a low organic content in the soil. These differences were reflected in a marked difference in the fauna of the two areas. The southern half contained species found in the unexcavated slacks that appear to require some shade but were probably eliminated from the other excavated slacks. 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 Loxton 12 Tan y Bwlch, Mynydd Llandegai, BANGOR, LL57 4DX email unknown <!-- No web site --> 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 invertebrate surveys INVERTEBRATES beetles coleoptera sand dune ecology sand dunes (sand-dunes) (dunes) (see also specifically named dunes) Newborough Warren NNR NRW Thesaurus 2023-12-31 geonetwork.thesaurus.local.theme.converted_nrw-keywords SeaDataNet Parameter Discovery Vocabulary 2021-01-06 geonetwork.thesaurus.external.theme.rdf+xml Integrated Public Sector Vocabulary 2013-04-03 geonetwork.thesaurus.external.theme.subjects NRW SMNR Vocabulary 2023-12-27 geonetwork.thesaurus.local.theme.converted_nrw-smnr-keywords There are no access restrictions to this data. NRW may release, publish or disseminate it freely. no limitations © CNC/NRW, 2015. 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. English biota SeaVoX Vertical Co-ordinate Coverages 2021-01-06 SIR YNYS MON - ISLE OF ANGLESEY -4.42199147 -4.32346536 53.12388437 53.17092859 2014-04-01 2014-09-01 Monitoring invertebrates by pitfall trapping after excavation of the surface vegetation in two slacks at Newborough Warren - Ynys Llanddwyn SSSI in 2013 Monitoring invertebrates by pitfall trapping after excavation of the surface vegetation in two slacks at Newborough Warren, Ynys Llanddwyn Site of Special Scientific Interest (SSSI) in 2013. Monitoring invertebrates in 2014 by finger searching and pitfall trapping after excavation of the surface vegetation in three slacks at Newborough Warren - Ynys Llanddwyn SSSI Database [A] PDF report [B] Data will be provided to NRW by the originator to be imported into Recorder 6 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 methodology adopted for this survey work was pitfall trapping and visual searches. To date, six of the 16 beetle species recorded from Newborough Warren that are associated with pioneer dune slacks have been recorded from the excavated slacks, including the rove beetles Bledius subniger and Gabrius osseticus, the ground beetles Dyschirius politus and Bembidion pallidipenne, and Dryops nitidulus and Heterocerus flexuosus. The latter was first found here in 2014, with the other five being recorded in both 2013 and 2014. As only Dryops nitidulus has been recorded from the control Slack 1, in 2013, this suggests that these species are colonising the excavated slacks from remnant pockets of suitable habitat within the dune system rather than records representing a legacy of existing populations within the slacks. The data will be provided to NRW to be imported into Recorder 6. This is a very large dataset and it will take time to format it for import. Voucher specimens have been retained by the report author, some of which have been deposited in the collections in Liverpool Museum. The methodology adopted for this survey work was pitfall trapping and visual searches. To date, six of the 16 beetle species recorded from Newborough Warren that are associated with pioneer dune slacks have been recorded from the excavated slacks, including the rove beetles Bledius subniger and Gabrius osseticus, the ground beetles Dyschirius politus and Bembidion pallidipenne, and Dryops nitidulus and Heterocerus flexuosus. The latter was first found here in 2014, with the other five being recorded in both 2013 and 2014. As only Dryops nitidulus has been recorded from the control Slack 1, in 2013, this suggests that these species are colonising the excavated slacks from remnant pockets of suitable habitat within the dune system rather than records representing a legacy of existing populations within the slacks. The data will be provided to NRW to be imported into Recorder 6. This is a very large dataset and it will take time to format it for import. Voucher specimens have been retained by the report author, some of which have been deposited in the collections in Liverpool Museum.