Monitoring Invertebrate features on Sites of Special Scientific Interest (SSSIs): assessing and reviewing the status of the troglobitic spider Porrhomma rosenhaueri in Ogof y Ci and Lesser Garth Cave, South Wales in 2017

This dataset was collected to assess whether Porrhomma rosenhaueri was still present in the Ogof y Ci cave system and if so, to consider the viability of establishing a Common Standards Monitoring (CSM) protocol for monitoring the population within the cave; and to revisit the CSM established for the Lesser Garth Cave to collate further data on the condition of both the Porrhomma rosenhaueri population and the ecological condition of the cave. The cave-dwelling spider Porrhomma rosenhaueri (L. Koch) is unique to the British fauna as it is considered to be the only species of paleotroglobitic spider present, and whilst the cavernicolous fauna of the UK has undoubtedly been under-recorded, sufficient work has occurred to suggest that Porrhomma rosenhaueri is genuinely rare.The spider has a very limited distribution in the UK and is only known from two sites in South Wales, Ogof y Ci near Merthyr Tydfil and Lesser Garth Cave near Cardiff. The Ogof y Ci population was first discovered in 1971 but since this period no recorded survey work on the spider has taken place and the status of the spider within the cave was unknown. The Lesser Garth Cave population was discovered in 1979 during an investigation of the cave for the cave dwelling isopod Proasellus cavaticus. The cave has since been surveyed for the spider on a number of occasions, initially in 1997 as part of an environmental impact assessment, and more recently in 2009 in order to establish a Common Standards Monitoring (CSM) protocol for the longer-term monitoring of the spider population in the cave.

Identifier: NRW_DS121120

Alternative Title

Monitro nodweddion Infertebratau o Safleoedd o Ddiddordeb Gwyddonol Arbennig (SoDdGA): asesu ac adolygu statws y corynod Porrhomma rosenhaueri yn Ogof y Ci ac Ogof Ffynnon Taf De Cymru yn 2017

Metadata Language: English

Lineage: Surveys were by visual searches. The survey of Ogof y Ci, along with other accessible sites within the Nant Glais Caves SSSI, was the primary objective of the survey work. Two site visits were carried out in September and October 2017 to assess biospeleology of the Nant Glais SSSI and to survey Ogof y Ci for Porrhomma rosenhaueri. The spider was found to be still present within the Ogof y Ci cave complex, the first record since 1971, with a total of seven live spiders found during the site survey providing sufficient information to suggest a future monitoring protocol for the cave. The repeat of the CSM protocol for the Lesser Garth Cave occurred during October 2017 and gave comparable numbers of spiders (15 adults and subadults, and up to 47 webs) and their distribution within the cave to the 2009 survey work suggesting a stable population within the cave. Overall, this survey work demonstrates that Porrhomma rosenhaueri is still present at both of its known locations, and that both cave sites support important cave invertebrate habitats within the UK.

Dataset Reference Date (Publication): 2018-01-01

Temporal Extent

Begin date: 2017-09-09

End date: 2017-10-31

Topic category

Biota

Owner

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Originator

National Museums and Galleries of Wales

Education Department, Cathays Park, Cardiff, Vale of Glamorgan, CF1 3NP

http://www.museumwales.ac.uk/

Extent

Geographic Extent: Wales (WLS)

Format Type and Description

Database ()

Specification

[A] Database - records held in WID -Recorder 6. [B] Documents: pdf of the report in the DMS report archive.

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
Degree: false

Lineage: Surveys were by visual searches. The survey of Ogof y Ci, along with other accessible sites within the Nant Glais Caves SSSI, was the primary objective of the survey work. Two site visits were carried out in September and October 2017 to assess biospeleology of the Nant Glais SSSI and to survey Ogof y Ci for Porrhomma rosenhaueri. The spider was found to be still present within the Ogof y Ci cave complex, the first record since 1971, with a total of seven live spiders found during the site survey providing sufficient information to suggest a future monitoring protocol for the cave. The repeat of the CSM protocol for the Lesser Garth Cave occurred during October 2017 and gave comparable numbers of spiders (15 adults and subadults, and up to 47 webs) and their distribution within the cave to the 2009 survey work suggesting a stable population within the cave. Overall, this survey work demonstrates that Porrhomma rosenhaueri is still present at both of its known locations, and that both cave sites support important cave invertebrate habitats within the UK.

Keywords

GEMET - INSPIRE themes, version 1.0

Type: Theme

Citation

Date (Publication): 2008-06-01

Code: geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus

ecological surveys
biological surveys
biological monitoring
cave spider
porrhomma rosenhaueri
caves
invertebrate surveys

Type: Theme

Citation

Date (Publication): 2023-12-31

Code: geonetwork.thesaurus.local.theme.converted_nrw-keywords

Code: British National Grid (EPSG::27700)

Content Information

NRW Profile

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NRW Related Title: Monitoring Invertebrate features on SSSIs: assessing and reviewing the status of the troglobitic spider Porrhomma rosenhaueri in Ogof y Ci and Lesser Garth Cave, South Wales in 2017

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

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Use constraints type: 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

File Identifier: 4f4c4942-4343-5764-6473-313231313230 XML

Metadata Language: English

Parent Identifier: Welsh Invertebrate Database (WID)
NRW_DS23774

Resource type: Dataset

Metadata Date: 2024-05-31T09:41:05.612Z

Metadata Standard Name: NRW

Metadata Standard Version: 1.0

pointOfContact

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

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Monitoring Invertebrate features on Sites of Special Scientific Interest (SSSIs): assessing and reviewing the status of the troglobitic spider Porrhomma rosenhaueri in Ogof y Ci and Lesser Garth Cave, South Wales in 2017

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Keywords

Keywords

Citation

Keywords

Citation

Spatial Reference System

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NRW Profile

Custom Elements

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Constraints

Limitations on Public Access and Use

Access Constraints Directive

Access Constraints Text

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