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Neoascia geniculata

 
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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 geniculata Reply with quote

Neoascia geniculata (Meigen, 1822)

Identification ease/difficulty: 4

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 geniculata (Meigen, 1822)

Biology: The small, semi-aquatic larvae have been found in decaying vegetation around the margins of ponds. Usually swept from lush emergent vegetation, such as Glyceria, around ponds and ditches. Adults visit flowers, especially Ranunculus, but do not seem to move far from larval habitat

Distribution: This is a difficult species to identify and may be under-recorded. It appears to be widely distributed and is often abundant in suitable habitat
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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).

NEOASCIA GENICULATA (Meigen) NOTABLE

DISTRIBUTION Records scattered widely in England, Wales and Scotland including Orkney.

HABITAT Marshes and water margins where there is lush emergent vegetation such as Glyceria.

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

STATUS Widespread but very local with about 35 known post 1960 sites, and not infrequent in the Scottish Highlands and parts of northern England (Yorkshire, Cheshire).

THREAT The destruction of wetland habitats through drainage for agriculture or intensive forestry and the removal of marginal vegetation from ditches and ponds; pollution such as agricultural run-off; mis-management of water levels with subsequent scrub invasion and a loss of breeding sites.

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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