Summary for Argenna patula (Araneae)

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National Distribution

 
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Identification difficulty rating: 4
Name: Argenna patula
Authority: (Simon, 1874)
Order: Arachnida: Araneae
Family: Dictynidae
National Rarity status: NS
IUCN status: LC

Records: 148
First Record: 1900
Latest Record: 2016

1992-on hectads: 25
Pre-1992 hectads: 21
Total hectads: 41

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About this species

Recorded altitude range
0m to 35m

Species text

Distribution
Coastal from southwest Scotland southwards round to The Wash, but the majority of sites are in East Anglia and the Thames Estuary. The distribution is restricted by the number of suitable rivers, estuaries and saltmarshes. The species is widespread on the coasts of western Europe.

Habitat and ecology
Estuaries, saltmarsh. The spider occurs among strandline litter and under stones on the banks of tidal rivers or on estuaries and saltmarshes, and may be frequent where it occurs. Adults of both sexes are found in May and June, females until October.

Status
Apparently not scarce in suitable habitat, though limited by this. Recorded in 19 hectads post 1992.

Threats
Pollution on some rivers and the loss of saltmarsh to land reclamation may threaten the species at some sites. There has been a massive loss of saltmarsh on parts of the east coast where erosion has been attributed to relative sea level rise resulting from a combination of land falling following the retreat of the last Ice Age and sea rising due to global warming. In Essex typical losses of around 20% per estuary, with one site approaching 50%, have been reported over the fifteen-year period 1973-1988 and have continued unabated between 1988 and 1998.

Management and conservation
Retain strandline litter in soft-coast habitats. Managed realignment, including the controlled breaching of sea walls, may provide new areas of suitable habitat.

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 67 records with adult season information)


Habitats

background methodology

Broad Habitat Data (based on 46 records with habitat information)

Broad subhabitat Data (based on 2 records with subhabitat information)

Structural Habitat Data (based on 38 records with structural habitat information)

Habitat Detail and Method (based on 39 records with habitat detail and method information)

Recorded management for locations with Argenna patula

Recorded substrate and hydrology for locations with Argenna patula

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