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Brachyopa insensilis

 
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stuart
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Joined: 11 May 2005
Posts: 737
Location: Peterborough, UK

PostPosted: Sat May 28, 2005 5:39 pm    Post subject: Brachyopa insensilis Reply with quote

Brachyopa insensilis Collin, 1939

Identification ease/difficulty: 2

StatusHabitat indicator statusSources of information
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Last edited by stuart on Wed Jun 01, 2005 9:30 pm; edited 1 time in total
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stuart
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Joined: 11 May 2005
Posts: 737
Location: Peterborough, UK

PostPosted: Sun May 29, 2005 8:40 am    Post subject: Species account from the Provisional atlas Reply with quote

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

Brachyopa insensilis Collin, 1939

Biology: The larvae of this species occur in runs or accumulations of sap under the bark of trees. Although traditionally associated with Ulmus, in recent years it has been found on a wide range of deciduous tree species including Fraxinus, *, Tilia, and particularly Aesculus, often in urban and suburban situations. Adults are usually found sitting on tree trunks or vegetation near the larval habitat, and can often be seen hovering in small groups immediately in front of a sap run. Stirring up a sap run (presumably releasing odours) can often result in the rapid arrival of adults

Distribution: Since the realisation that both adults and larvae can easily be found at sap runs on Aesculus, this species has been recorded much more frequently and over a much wider area, although most records of adults are still from the south and east of Britain. Rotheray (1993, 1996) considers it the commonest species of the genus based on larval records, and it will probably be found in any urban location where Aesculus is present
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stuart
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Joined: 11 May 2005
Posts: 737
Location: Peterborough, UK

PostPosted: Sun May 29, 2005 9:08 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).

BRACHYOPA INSENSILIS (Collin) NOTABLE

DISTRIBUTION Mainly recorded in southern England, but extending sporadically to the north Midlands, Wales and recent, very isolated records from Sutherland and Easterness in Scotland.

HABITAT Broadleaved woodland, parkland and even isolated old trees in hedgerows and along road sides. There is a requirement for old or diseased trees with sap runs and elms are especially favoured.

ECOLOGY The larvae probably develop in sap runs, mainly in elm and also on horse chestnut and occasionally beech. Adults may be observed hovering near such sites or visiting spring blossom such as cherry and hawthorn and are recorded from early May to late June.

STATUS Dutch elm disease must have had a detrimental effect on this species as elm appears to provide the main breeding site. However, it seems to be able to use other species, especially horse chestnut in place of elm. It is not a species restricted to ancient woodland (though it can occur there) and seems to possess some ability to colonise new areas. About 20 post 1960 sites are known.

THREAT Loss of old broadleaved woodland for agriculture or intensive forestry; Dutch elm disease and removal of old living elms in woods and hedgerows. Removal of trees for assumed hygene purposes in parks and roadsides. The shading out of rides and clearings within woods.

MANAGEMENT Retain old or diseased trees especially elms with oozing sap runs, which may be detected by the brown staining of the bark and ensure their continuity in future. In woodland, maintain rides and clearings with blossoms for adult feeding.
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