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Neoascia obliqua

 
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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: Neoascia obliqua Reply with quote

Neoascia obliqua Coe, 1940

Identification ease/difficulty: 3

StatusSources of information
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stuart
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Joined: 11 May 2005
Posts: 737
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.

Neoascia obliqua Coe, 1940

Biology: The larvae of this species remain unknown, but other members of the genus are semi-aquatic, inhabiting accumulations of wet, organic matter. Found amongst lush vegetation in marshes and water margins in sheltered locations, such as at the edges of wet woods and wooded streams

Distribution: Widely distributed but generally scarce, with most records from northern England and Scotland. Recent observations suggest that this can be the most frequently encountered member of the genus in some parts of Derbyshire and Yorkshire, where it is possibly associated with beds of Petasites (Whiteley, pers. comm.)
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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 9:08 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).

NEOASCIA OBLIQUA Coe NOTABLE

DISTRIBUTION Records widely dispersed in England, South Wales and Scotland, becoming most frequent in northern England and Scotland.

HABITAT Marshes and water margins at the edges of woods.

ECOLOGY Larvae probably develop in wet mud or vegetation as detritus feeders. Adults recorded from May to July.

STATUS A very local though widespread species with 25 known post 1960 sites and locally frequent in some areas such as Derbyshire and Yorkshire fen localities. Status revised from RDB3 (Shirt 1987).

THREAT The destruction of marshes through drainage for agriculture or intensive forestry and the removal of marginal vegetation from ponds and ditches; mis-management of water levels with a subsequent loss of breeding sites and scrub invasion.

MANAGEMENT Maintain a high, stable water level and employ rotational ditch and pond management if necessary to ensure all successional stages are present every year.
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