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=/ 2026-10-01T14:47:08.403Z NRW 1.0 wel utf8 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 http://naturalresources.wales/ The purpose of this data collection was to monitor the colonisation of excavated inland dune slacks by specialist pioneer invertebrates at Newborough Warren National Nature Reserve (NNR). The monitoring represented a continuation of work undertaken in 2013. All invertebrates belonging to the taxa Orthoptera, Heteroptera, Auchenorrhyncha, Coleoptera, Aculeata, Diplopoda, Chilopoda, Araneae, and Opiliones that were captured during the survey were identified and counted. The abundance of individual species was recorded and corrected for trapping effort. There was little evidence of any change in the fauna associated with the exposed dune habitat compared with 2013. However, within the slack habitats exposed by excavation, finger-searching and mapping of cast distributions revealed a marked increase in the abundance of the rove beetle Bledius subniger. Pitfall trapping in Slack 4 also demonstrated the abundance of the ground beetles Dyschirius impunctipennis and Dyschirius politus, both of which are known predators of B. subniger. Another ground beetle, Bembidion pallidipenne, a species characteristic of embryonic slack habitats, was also found to be abundant. It is tentatively concluded that this assemblage has increased substantially, probably as a result of successful breeding following the 2013 excavation work. The study also highlights potential biases associated with pitfall trapping and the need for caution when comparing abundance between species captured using this method. No discernible increase was detected in species of Heterocerus or Dryops. Slack 4 contained two distinct areas of slack habitat created by the excavation. The southern section exhibited higher soil organic content together with greater plant cover and diversity. In contrast, the northern section had sparse vegetation and lower organic content. These environmental differences were reflected in marked differences in the invertebrate fauna of the two areas. The southern section supported species that were also present in the unexcavated slacks and that appear to require some degree of vegetation cover or shade. These species were largely absent from the more exposed excavated slack areas. The purpose of this data collection was to monitor the colonisation of excavated inland dune slacks by specialist pioneer invertebrates at Newborough Warren National Nature Reserve (NNR). The monitoring represented a continuation of work undertaken in 2013. All invertebrates belonging to the taxa Orthoptera, Heteroptera, Auchenorrhyncha, Coleoptera, Aculeata, Diplopoda, Chilopoda, Araneae, and Opiliones that were captured during the survey were identified and counted. The abundance of individual species was recorded and corrected for trapping effort. There was little evidence of any change in the fauna associated with the exposed dune habitat compared with 2013. However, within the slack habitats exposed by excavation, finger-searching and mapping of cast distributions revealed a marked increase in the abundance of the rove beetle Bledius subniger. Pitfall trapping in Slack 4 also demonstrated the abundance of the ground beetles Dyschirius impunctipennis and Dyschirius politus, both of which are known predators of B. subniger. Another ground beetle, Bembidion pallidipenne, a species characteristic of embryonic slack habitats, was also found to be abundant. It is tentatively concluded that this assemblage has increased substantially, probably as a result of successful breeding following the 2013 excavation work. The study also highlights potential biases associated with pitfall trapping and the need for caution when comparing abundance between species captured using this method. No discernible increase was detected in species of Heterocerus or Dryops. Slack 4 contained two distinct areas of slack habitat created by the excavation. The southern section exhibited higher soil organic content together with greater plant cover and diversity. In contrast, the northern section had sparse vegetation and lower organic content. These environmental differences were reflected in marked differences in the invertebrate fauna of the two areas. The southern section supported species that were also present in the unexcavated slacks and that appear to require some degree of vegetation cover or shade. These species were largely absent from the more exposed excavated slack areas. 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 Newborough Warren NNR sand dunes (sand-dunes) (dunes) (see also specifically named dunes) coleoptera invertebrate surveys sand dune ecology beetles INVERTEBRATES NRW Thesaurus 2026-08-27 geonetwork.thesaurus.local.theme.converted_nrw-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. Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Open Government Licence 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 Documents Unknown PDF report Database Unknown Data 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 survey methodology comprised 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. These include the rove beetles Bledius subniger and Gabrius osseticus; the ground beetles Dyschirius politus and Bembidion pallidipenne; and Dryops nitidulus and Heterocerus flexuosus. Heterocerus flexuosus was first recorded at the site in 2014, while the other five species were recorded in both 2013 and 2014. As only Dryops nitidulus was recorded from the control site (Slack 1) in 2013, these findings suggest that the species are colonising the excavated slacks from remnant areas of suitable habitat within the dune system, rather than representing residual populations that were already present within the slacks prior to excavation. The data will be supplied to NRW for import into Recorder 6. As this is a large dataset, additional time will be required to format the records for import. Voucher specimens have been retained by the report author, with some specimens deposited in the collections of Liverpool Museum. The survey methodology comprised 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. These include the rove beetles Bledius subniger and Gabrius osseticus; the ground beetles Dyschirius politus and Bembidion pallidipenne; and Dryops nitidulus and Heterocerus flexuosus. Heterocerus flexuosus was first recorded at the site in 2014, while the other five species were recorded in both 2013 and 2014. As only Dryops nitidulus was recorded from the control site (Slack 1) in 2013, these findings suggest that the species are colonising the excavated slacks from remnant areas of suitable habitat within the dune system, rather than representing residual populations that were already present within the slacks prior to excavation. The data will be supplied to NRW for import into Recorder 6. As this is a large dataset, additional time will be required to format the records for import. Voucher specimens have been retained by the report author, with some specimens deposited in the collections of Liverpool Museum.