Summary for Carorita limnaea (Araneae)

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National Distribution

 
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Identification difficulty rating: 4
Name: Carorita limnaea
Authority: (Crosby & Bishop, 1927)
Order: Arachnida: Araneae
Family: Linyphiidae
National Rarity status: NR
IUCN status: VU, criteria: D2

Records: 31
First Record: 1962
Latest Record: 2017

1992-on hectads: 2
Pre-1992 hectads: 1
Total hectads: 4

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About this species

Recorded altitude range
50m to 50m

Species text

Distribution
In Britain, the species is recorded only from Wybunbury Moss, Cheshire, where it was first found in 1962 and Whixall Moss, Shropshire where it was discovered in 1993. The spider fauna of the Cheshire Mosses is well-studied, but Wybunbury Moss is the only one at which this species has been recorded. It has been abundant at the site, but a brief search in 1988 failed to find it and it was only in 1993 that it was recorded again, when one male and twelve females were detected by meticulous sieving and sorting of wet Sphagnum moss on floating bog. At Whixall Moss, only a single male has been found despite the intensive and extensive nature of an English Nature survey. It is also known from Ireland, Sweden, Germany, Finland, the Czech Republic and Poland.

Habitat and ecology
It occurs in Sphagnum bog, sometimes in association with Erica tetralix, Eriophorum and Vaccinium oxycoccus. Both sexes are found in June and July.

Status
Known from just two sites since 1992 and at one of these from a single specimen. Within this restricted area of occupancy the extent and quality of the habitat has suffered decline, but is now apparently improving.

Threats
Wybunbury Moss suffered severe pollution from septic tank overflow and road drainage for many years up to 1986. This nutrient enrichment has had a marked effect on the vegetation and is causing the deep peat to degrade. Much of the former Sphagnum lawn has developed into fen. Eutrophication from agricultural run-off still threatens further damage. Further substantial areas of the nutrient-poor raft have developed into pine and birch woodland, aided by previous drainage attempts.

Management and conservation
In 1986 major sources of eutrophic water at Wybunbury Moss were intercepted and diverted away from the reserve. As a result peat degradation and fen encroachment appear to be receding. Removal of invading trees also commenced in 1986 and is continuing with encouraging results.

Text based on Dawson, I.K., Harvey, P.R., Merrett, P. & Russell-Smith, A.R. (in prep.).  References

Adult Season

Adult Season Data (based on 13 records with adult season information)


Habitats

background methodology

Broad Habitat Data (based on 3 records with habitat information)

no subhabitat data available

no structural habitat data available

Habitat Detail and Method (based on 14 records with habitat detail and method information)

Recorded management for locations with Carorita limnaea

Recorded substrate and hydrology for locations with Carorita limnaea

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