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Orthonevra 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: Orthonevra geniculata Reply with quote

Orthonevra geniculata (Meigen, 1830)

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.

Orthonevra geniculata Meigen, 1830

Biology: The larvae of this species remain unknown, but are presumed to be aquatic like others of the genus. Generally found in mildly acid, boggy areas in Scotland, but also in fens in East Anglia and on heathland with base influences in southern Britain. Adults are usually found close to water where they will visit flowers, but also settle on bare patches and dead vegetation in the sun

Distribution: A scarce species, found most frequently in central Scotland, but with scattered records in England
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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).

ORTHONEVRA GENICULATA Meigen NOTABLE

DISTRIBUTION Recorded widely in England and Scotland, with most records for the Scottish Highlands. It is probably present in Wales, though no records are known as yet.

HABITAT Bogs and occasionally fens as in Cambridgeshire and parts of East Anglia.

ECOLOGY Larvae probably occurring in organically rich mud by ponds and streams. Adults recorded from April to July and have been observed visiting flowers such as marsh marigold, bog bean, umbels and shrub blossom.

STATUS An extremely local though widespread species with about 35 known post 1960 sites. It is comparatively frequent and widespread in parts of the Scottish Highlands and English strongholds include the New Forest bogs and the fens of the East Midlands and East Anglia. Status revised from RDB3 (Shirt 1987).

THREAT The drainage of bogs for agriculture, intensive forestry and peat cutting in certain areas; pollution such as agricultural run-off; mis-management of water levels with a subsequent loss of breeding sites and scrub invasion.

MANAGEMENT Ensure 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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