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Doros profuges

 
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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: Doros profuges Reply with quote

Doros profuges (Harris, [1780])

NomenclatureIdentification ease/difficulty: 2

StatusSources of information
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stuart
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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.

Doros profuges Harris, 1780 Doros conopseus (Fabricius) in Stubbs & Falk (1983)

Biology: A 19th century observation suggests that the larvae may be associated with ants living in wood, where they probably feed on ant-attended aphids. Adults have most frequently been seen at the edge of scrub or woodland around Rubus, either visiting the flowers or resting on vegetation, but they have also been recorded sitting on a rotten tree trunk, around sap runs and on reeds. On chalk downland in Surrey, a female was observed to oviposit low down on the trunk of a young Fraxinus (Stubbs, 1996). Adults appear to be very elusive and may be primarily arboreal; recent records include several specimens caught in Malaise traps at sites where the species has not otherwise been recorded

Distribution: This species is strongly associated with soils on a basic substrate. Although older records are more widespread, most recent records come from on or near the chalk of southern England, although there are some from the southern Lake District and from Mull. There is a long series records from Leigh and Benfleet in Essex from the 19th Century to the 1960s
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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).

Doros conopseus (F., 1776) VULNERABLE

Identification: Stubbs & Falk (1983), pp. 61 and 135, Pl. 4:14.

Distribution: The western Weald, also south Essex, Wiltshire, Hampshire, and a few other records including north Cumbria.

Habitat and ecology: Mainly chalk grassland, at the edge of scrub or woodland, often in association with brambleRubus. The ecology of the larva is unknown but it will be of the predatory type.

Status: Always very rare, recent records being confined to a few chalkland sites in the western Weald, Wiltshire and south Essex. Two were taken by D.A. Sheppard on Martin Down, Hampshire, in June 1982.Conservation: Martin Down is an NNR.

Author: A. E. Stubbs.
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stuart
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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).

DOROS CONOPSEUS (Fabricius) VULNERABLE

DISTRIBUTION Records mainly from southern England, but extending to Westmorland and Caernarvonshire. Most recent records are from Sussex and Wiltshire.

HABITAT Calcareous grassland and scrub, especially near woodland edges. Brambles are usually present at known sites and most sites are on chalk.

ECOLOGY Larvae suspected of feeding on root aphids and abroad have been reported from turf. Adults recorded from late May to July usually resting on or flying around bramble. On the chalk downs in Surrey a female was observed ovipositing low down on the trunk of an isolated ash tree on chalk grassland, suggesting a more specific developmental site is the turf around tree trunks.

STATUS Decreasing with many of its old sites destroyed. About a dozen post 1960 sites as follows: Vernditch Chase, (1960s, 1979), Grovel Wood (late 1960s) and Martin Down (1982), Wiltshire; Oxenbourne Down, Hampshire (1973); Friston Forest (1969, 1975, 1976), Brighton area (1986), Kingley Vale (1978), Lewes Downs (1987) and Arundel Park (1976), Sussex; Box Hill area (post 1965), Surrey; Dagnam Park (undated) and Leigh-on-Sea (1960, 1968), Essex. A reasonably strong population is present at Friston despite extensive afforestation, though it may be dependant on rides. At Leigh-on-Sea it has been found for a period of over 200 years (since mid 1700s).

THREAT Habitat loss through afforestation or agricultural improvement; also changes in grazing management with scrub invasion and a loss of floristic richness and diversity.

MANAGEMENT Maintain a mosaic of vegetation types including some limited scrub employing rotational grazing policies if necessary.
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