A survey and assessment of the saproxylic invertebrate fauna of Gregynog National Nature Reserve, Powys - 2022

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  • wel
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The Gregynog Hall Estate comprises about 300ha of ancient wood pasture habitats within the old county of Montgomeryshire. The 15ha of Great Wood were designated a Site of Special Scientific Interest (SSSI) for its rich epiphytic lichen communities in 1978 although it later proved to also have significant interest for invertebrates and especially those species associated with the decaying wood (saproxylic) habitats provided by the abundance of veteran trees. The SSSI was extended in 2011 and the whole estate declared a National Nature Reserve in 2012. A survey of the saproxylic invertebrates of the wider NNR was commissioned by Natural Resources Wales in 2022. This is the first baseline survey of the fauna, previous research comprising exploratory surveys only. The aims of the survey were to determine the current condition of the saproxylic invertebrate fauna and to identify any threats.

Identification

Dynodydd
Identifier
NRW_DS125448
Laith Metadata
Metadata Language
English
Lineage

The baseline standard for saproxylic invertebrate surveys is for three visits to be carried out across the field season, targeting late spring, high summer and autumn. Given the large extent of the NNR and the desire to operate some flight interception trapping in parallel with field survey each visit involved more than one day. The first exploratory visit was carried out on 23rd April 2022 and ten flight interception traps positioned on 24th April. The second visit took place on 22nd May and two additional flight traps were positioned. The third visit covered 7th to 9th June and targeted hawthorn blossom as well as emptying and maintaining the traps. The fourth visit was over 11th and 13th August. The final visit was on 18th and 19th November when the traps were removed. The main techniques used were as follows: • visual inspection of vegetation and accessible wood-decay for invertebrates; • spot-sweeping, i.e. targeting observed invertebrates for netting; • general sweep-netting, i.e. un-targeted; • hand search, e.g. by searching amongst woody debris; • beating foliage and branches of trees, shrubs and dwarf shrubs using beating tray; • beating blossom on flowering shrubs Wherever possible specimens encountered were identified in the field, retaining voucher specimens of the more critical species. Some larvae found amongst decaying wood were retained for rearing through to the more identifiable adult insect. Other specimens were taken away for inspection under microscope.
Additional Information

Alexander, K.N.A. 2023. A survey and assessment of the saproxylic invertebrate fauna of Gregynog National Nature Reserve, Powys in 2022. NRW Evidence Report No. 671. 61pp. Natural Resources Wales, Bangor.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2023-02-01
Perchennog
Owner
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 

Extent

Extent

Hyd
Geographic Extent
POWYS - POWYS
N
W
E
S
Map representing the geographic extent of the dataset


 
 

Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Database ()

    Specification

    The data archive contains: The final report in Microsoft Word and Adobe PDF formats. Species records held in the Welsh Invertebrate Database (WID)

 

Quality

Ansawdd Data
Data quality

Cwmpas Ansawdd
Quality Scope
Dataset
Dataset
Cydymffurfiad
Conformity
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
Explanation
Degree
false
Lineage

The baseline standard for saproxylic invertebrate surveys is for three visits to be carried out across the field season, targeting late spring, high summer and autumn. Given the large extent of the NNR and the desire to operate some flight interception trapping in parallel with field survey each visit involved more than one day. The first exploratory visit was carried out on 23rd April 2022 and ten flight interception traps positioned on 24th April. The second visit took place on 22nd May and two additional flight traps were positioned. The third visit covered 7th to 9th June and targeted hawthorn blossom as well as emptying and maintaining the traps. The fourth visit was over 11th and 13th August. The final visit was on 18th and 19th November when the traps were removed. The main techniques used were as follows: • visual inspection of vegetation and accessible wood-decay for invertebrates; • spot-sweeping, i.e. targeting observed invertebrates for netting; • general sweep-netting, i.e. un-targeted; • hand search, e.g. by searching amongst woody debris; • beating foliage and branches of trees, shrubs and dwarf shrubs using beating tray; • beating blossom on flowering shrubs Wherever possible specimens encountered were identified in the field, retaining voucher specimens of the more critical species. Some larvae found amongst decaying wood were retained for rearing through to the more identifiable adult insect. Other specimens were taken away for inspection under microscope.
 

Keywords

Allweddair
Keywords

GEMET - INSPIRE themes, version 1.0
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Allweddair
Keywords

NRW Thesaurus
  • saproxylic invertebrate fauna
  • Gregynog National Nature Reserve
  • saproxylic beetle
  • diptera
  • flies
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2023-12-31
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords
 

Spatial Reference System

Code
NONE
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

NRW Related Title

A Survey and Assessment of the Saproxylic Invertebrate Fauna of Gregynog National Nature Reserve, Powys in 2022
 

Constraints

Constraints

Limitations on Public Access and Use

Math o Gyfyngiad
Restriction type
Other restrictions
Other restrictions
 

Access Constraints Directive

Limitations
no limitations
 

Access Constraints Text

Other constraints

There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
 

Use Constraints

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© 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.
 

Attribution Statement

Other constraints
Open Government Licence (OGL)
 

Licence

Other constraints
Open Government Licence (OGL)
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313235343438 XML
Laith Metadata
Metadata Language
English
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2024-05-31T09:41:04.997Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
pointOfContact
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 
 

Publishing Body

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