Summary for Theridion hemerobium (Araneae)

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National Distribution

 
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Identification difficulty rating: 4
Name: Theridion hemerobium
Authority: Simon, 1914
Order: Arachnida: Araneae
Family: Theridiidae
National Rarity status: NS
IUCN status: NA

Records: 154
First Record: 1996
Latest Record: 2015

1992-on hectads: 75
Pre-1992 hectads: 0
Total hectads: 75

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About this species

Recorded altitude range
1m to 150m

Species text

Distribution
This spider was first recorded in Britain from four female specimens collected in 1982 by Dick Jones near Petworth in West Sussex. Subsequently the species has been found in Leicestershire in 1996, Hertfordshire, Middlesex, Worcestershire and most recently in Huntingdonshire. It has been recorded from Sweden, and is fairly widespread in the rest of north-western and central Europe.

Habitat and ecology
The original specimens were collected from a wooden fence bordering a lake and French specimens have been taken in low vegetation on marshes or bushes near water (Jones 1994). All further British records have the same association with water. In Leicestershire a female was collected at night from a fence separating a cattle-grazed field from the rough grassland and scrub of a fishing complex in part of the River Soar flood plain where marsh, wet woodland and lakes have developed in former gravel pits (Daws 1997a). In Middlesex and Hertfordshire, one male and five females were collected in wetland vegetation close to the River Colne and adjacent lake developed in old gravel excavations (Marriott 1998). The Worcestershire female was swept from vegetation on an island in the River Avon (Partridge 1999). In Huntingdonshire four males, one female and one immature were shaken from a dead sedge/grass clump standing at the edge of the water. The site is very sheltered between scrub and damp grassland in the north-west corner of an old gravel pit in the flood plain of the River Great Ouse (I. Dawson). Adult females have been collected in June, July and early September, males in April and June.

Status
Although apparently rare, the species has now been found in widely distributed localities in England and may have been overlooked in the past. It should certainly be looked for in suitable habitat in England and Wales.

Threats
Most flood plains in England have suffered extensive drainage for agriculture. Housing, retail and industrial development is increasingly threatening the habitats that remain, either directly or through unsustainable water abstraction. However the spider's occurrence near lakes and flooded gravel pits suggests that it may be able to move into suitable habitat.

Management and conservation
The retention of extensive marginal vegetation and marsh to rivers and lakes should be encouraged, and public access controlled to avoid damage to these habitats. Rough grassland should not be cut regularly but managed on a rotational basis to control scrub invasion. Excessive management of lake margins and adjacent grassland and scrub at fishing and amenity sites should be discouraged.

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 131 records with adult season information)


Habitats

background methodology

Broad Habitat Data (based on 78 records with habitat information)

Broad subhabitat Data (based on 4 records with subhabitat information)

Structural Habitat Data (based on 49 records with structural habitat information)

Habitat Detail and Method (based on 30 records with habitat detail and method information)

Recorded management for locations with Theridion hemerobium

Recorded substrate and hydrology for locations with Theridion hemerobium

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