Monitoring Invertebrate Features on Site of Special Scientific Interest (SSSIs): Tetragnatha striata on Newport Wetlands National Nature Reserve (NNR) Gwent (2013)
The spider genus Tetragnatha is represented in Britain by six species: Tetragnatha extensa, T. montana, T. nigrita, T. obtusa, T. pinicola and T. striata. This dataset concerns Tetragnatha striata, a species which is listed as Nationally Notable B. The Spider Recording Scheme holds 322 British records of Tetragnatha striata. However, in Wales, it has only been recorded from five locations: Cors Goch National Nature Reserves (NNR); Conwy RSPB Reserve; Parc Menai, Bangor; Kenfig NNR; Newport Wetlands NNR. It was first discovered at the Newport Wetlands NNR in 2001, when a population was found inhabiting emergent Phragmites at what is now known as Reedbed-6. The spider constructs a small orb-web on reeds, but is highly cryptic, folding itself along a reed stem when at rest. The data is used to detail the distribution of this feature across the NNR and proposes a Common Standards Monitoring protocol to enable its condition to be monitored and assessed in the future.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS115627
- Alternative Title
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- Monitro nodweddion infertebrata ar Safle o Ddiddordeb Gwyddonol Arbennig (SSSI): Tetragnatha striata ar Warchodfa Natur Genedlaethol Gwlyptiroedd Casnewydd (GNG) Gwent (2013)
- Metadata Language
- English
- Lineage
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Boat ditch transects The largely linear nature of the NNR’s open water, together with its dense marginal growth of Phragmites, were key factors in choosing to conduct most of the surveying from a boat (flat bottomed punt). This allowed safe and rapid surveying of the known habitat used by Tetragnatha striata – Phragmites emerging from standing water. Initially each egg-sac’s location was recorded by GPS, and its height above water estimated, but this was found to be impractical due to the number of egg-sacs encountered. Thereafter just total counts of egg-sacs and spiders were made for the lengths of the ditches (determined using GIS). Where multiple egg-sacs were deposited in a row, this information was also captured, but still defined as one 'deposition site'. Several spider specimens were collected throughout the survey to ensure other Tetragnatha species were not occupying the same habitat, and to verify that the observed egg-sacs were those of Tetragnatha striata (females collected next to egg-sacs). Foot survey It was not possible to use the boat at some locations on the NNR, due to the shallow water depth and presence of thick mud. In order to confirm the presence of Tetragnatha striata on the eastern lagoons and the small pool within Reedbed-11 waders were used to walk along sections of emergent reed. At the Old Lagoon and the Southern RSPB Reedbed egg-sac investigations were carried out from the bank using binoculars. Reed shaking It was found that by grabbing an arm-load of attached reeds and shaking it over the water surface, numerous spiders (including T. striata) would be dislodged and fall onto the water surface, from where they could be collected.
- Additional Information
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Gallon, R. C. 2014. Monitoring Invertebrate features on SSSIs: Tetragnatha striata on Newport Wetlands NNR, Gwent. NRW Evidence Report Report No: 7, 33pp, Natural Resources Wales, Cardiff
- Dataset Reference Date (Publication)
- 2014-03-31
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Distribution
- Format Type and Description
-
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Documents
()
- Specification
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[A] The final report in Microsoft Word and Adobe PDF formats. [B] A full set of maps produced in JPEG format. [C] A series of GIS layers on which the maps in the report are based with a series of word documents detailing the data processing and structure of the GIS layers [D] A full set of images produced in [jpg/tiff] format.
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Documents
()
Quality
Data quality
- Quality Scope
- Dataset
- 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
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This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
- Lineage
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Boat ditch transects The largely linear nature of the NNR’s open water, together with its dense marginal growth of Phragmites, were key factors in choosing to conduct most of the surveying from a boat (flat bottomed punt). This allowed safe and rapid surveying of the known habitat used by Tetragnatha striata – Phragmites emerging from standing water. Initially each egg-sac’s location was recorded by GPS, and its height above water estimated, but this was found to be impractical due to the number of egg-sacs encountered. Thereafter just total counts of egg-sacs and spiders were made for the lengths of the ditches (determined using GIS). Where multiple egg-sacs were deposited in a row, this information was also captured, but still defined as one 'deposition site'. Several spider specimens were collected throughout the survey to ensure other Tetragnatha species were not occupying the same habitat, and to verify that the observed egg-sacs were those of Tetragnatha striata (females collected next to egg-sacs). Foot survey It was not possible to use the boat at some locations on the NNR, due to the shallow water depth and presence of thick mud. In order to confirm the presence of Tetragnatha striata on the eastern lagoons and the small pool within Reedbed-11 waders were used to walk along sections of emergent reed. At the Old Lagoon and the Southern RSPB Reedbed egg-sac investigations were carried out from the bank using binoculars. Reed shaking It was found that by grabbing an arm-load of attached reeds and shaking it over the water surface, numerous spiders (including T. striata) would be dislodged and fall onto the water surface, from where they could be collected.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- spiders
- araneae
- Tetragnatha striata
- Newport Wetlands Reserve (see also Gwent Levels Wetlands Reserve)
- national nature reserves (NNR)
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
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Monitoring Invertebrate features on SSSIs: Tetragnatha striata on Newport Wetlands NNR, Gwent
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.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313135363237 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2025-03-07T17:14:27.159Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0