A survey and assessment of the saproxylic invertebrate fauna of Gregynog National Nature Reserve, Powys - 2022
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
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS125448
- Metadata Language
- English
- Lineage
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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
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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.
- Dataset Reference Date (Publication)
- 2023-02-01
Temporal Extent
- Begin date
- 2022-04-23
- End date
- 2022-11-19
- Topic category
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- Biota
Extent
Extent
- Geographic Extent
- POWYS - POWYS
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Distribution
- Format Type and Description
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Database
()
- Specification
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The data archive contains: The final report in Microsoft Word and Adobe PDF formats. Species records held in the Welsh Invertebrate Database (WID)
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Database
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
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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
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- saproxylic invertebrate fauna
- Gregynog National Nature Reserve
- saproxylic beetle
- diptera
- flies
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Spatial Reference System
- Code
- NONE
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
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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
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© 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
- File Identifier
- 4f4c4942-4343-5764-6473-313235343438 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2024-05-31T09:41:04.997Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0