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Chrysotoxum octomaculatum

 
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stuart
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Joined: 11 May 2005
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Location: Peterborough, UK

PostPosted: Sat May 28, 2005 5:39 pm    Post subject: Chrysotoxum octomaculatum Reply with quote

Chrysotoxum octomaculatum Curtis, 1831

Identification ease/difficulty: 4

StatusSources of information
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stuart
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Joined: 11 May 2005
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Location: Peterborough, UK

PostPosted: Sun May 29, 2005 8:41 am    Post subject: Species account from the Provisional atlas Reply with quote

Species account from Provisional atlas of British hoverflies, Ball & Morris, 2000.

Chrysotoxum octomaculatum Curtis, 1837

Biology: The larvae remain unknown, but this genus is thought to be associated with ants. Usually found near the edges of extensive dry heathland where it is fast flying and elusive. Speight (1998) reports that females fly fast and low over bare ground and short vegetation whilst males hover at 3-5m around trees and bushes, settling at 2m or above

Distribution: Older records are problematic, since C. verralli was not distinguished from this speciesuntil 1940. There are very few recent records, all from Dorset, Hampshire (New Forest heaths) and Surrey. Only Thursley Common seems to have produced reasonably regular records in the last two decades, other records being scattered singletons. Although it was recorded fairly regularly at Studland in the past, a recent survey commissioned by English Nature failed to find it, and its status in Britain must now give cause for serious concern
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stuart
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PostPosted: Sun May 29, 2005 9:08 am    Post subject: Data sheet from Insect Red Data Book, Shirt, 1987 Reply with quote

Datasheet from the Insect Red Data Book, Shirt (1989).

Chrysotoxum octomaculatum Curtis, 1837 VULNERABLE

Identification: Stubbs & Falk (1983), pp. 60 and 131, pl. 4:12.

Distribution: Confined to heaths in east Dorset, the New Forest and the western Weald. For map see Entwistle & Stubbs (1983), map 11.

Habitat and ecology: Confined to dry heathland. The ecology is virtually unknown, but the larvae will be of the aphid-feeding type, probably subterranean.

Status: Very rare.

Author: A. E. Stubbs.
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stuart
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Joined: 11 May 2005
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Location: Peterborough, UK

PostPosted: Sun May 29, 2005 9:09 am    Post subject: Data sheet from National Review of Diptera, Falk, 1991 Reply with quote

Datasheet from the Review of Scarce and Threatened Diptera, Falk (1991).

CHRYSOTOXUM OCTOMACULATUM Curtis VULNERABLE

DISTRIBUTION Reliable records few and restricted to Cornwall, Dorset, Surrey and Hampshire. Records are most numerous from the Dorset heaths.

HABITAT Most records relate to heathland.

ECOLOGY Larval habits unknown though possibly predators of root aphids or living in ant nests. Adults recorded from May to August.

STATUS Declining, with only five known post 1960 localities: Arne (1974) and Corfe (1960), Dorset; Thursley Common NNR (1966) and nearby Hankley Common (1988), Surrey; and Woolmer Heath (1974), Wealden Hampshire.

THREAT Loss of heathland to arable agriculture and intensive forestry has greatly reduced the area of suitable habitat and changes in heathland management may have resulted in its decline at existing sites. Accidental fires are a constant danger.

MANAGEMENT Maintain a pattern of traditional heath management, including rotational treatment of heather, attempting to maintain a mosaic of vegetation types and prevent scrub invasion.
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