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Neoascia interrupta

 
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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 interrupta Reply with quote

Neoascia interrupta (Meigen, 1822)

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 interrupta (Meigen, 1822)

Biology: The larvae of this species remain unknown, but other members of the genus are semi-aquatic, inhabiting wet organic matter. Adults are usually swept from lush vegetation around ponds and ditches, especially Typha. They have been found around mildly brackish ditches in grazing levels, in fenland and around richer ponds and ditches well inland. Speight (1998) notes that this species is largely coastal in the northern part of its European range

Distribution: This species was only added to the British list in 1981, but has subsequently been recorded quite widely in the south-east of England, including East Anglia, and northwards to Lincolnshire and South Yorkshire
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stuart
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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 INTERRUPTA (Meigen) NOTABLE

DISTRIBUTION Confirmed records restricted to the southeast of England as far west as Sussex, Buckinghamshire and Berkshire and north to Suffolk and Huntingdonshire. It is perhaps most frequent on coastal marshes, especially the Thames marshes, though it occurs at some sites well inland. A 1987 record from North Wales awaits confirmation.

HABITAT Ditches and ponds on brackish coastal marshes and inland fens and marshes. There appears to be some association with Typha, and lush ditches with fools celery Apium nodiflorum are particularly favoured.

ECOLOGY Larvae probably living in wet mud or vegetation as detritus feeders. Adults recorded from May to September and visit flowers such as forget-me-not and fools celery.

STATUS Only added to this British list in 1981 since when it has shown itself to be locally frequent on the coastal marshes of Sussex, Kent and Essex with about 20 known post 1960 sites (12 in Essex).

THREAT The destruction of marshes (especially coastal) through drainage for agriculture and urban or industrial development, and the removal of marginal vegetation from ponds and ditches. Also pollution from industry and agricultural run-off.

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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