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Orthonevra brevicornis

 
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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 brevicornis Reply with quote

Orthonevra brevicornis (Loew, 1843)

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 brevicornis Loew, 1843

Biology: The larvae are aquatic, living in accumulations of decaying vegetation, especially in mesotrophic or base-rich seepages in fens, meadows and occasionally woods. Adults can be found in marshes and fens

Distribution: This scarce species is widely distributed in England, though possibly more frequent towards the south and east. There are scattered records from both Scotland and Wales
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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 BREVICORNIS Loew NOTABLE

DISTRIBUTION Recorded widely in England, Wales and Scotland as far north as Ross and Cromarty.

HABITAT Marshes and fens, especially where seepages and streamlets are present.

ECOLOGY Larvae said to occur in organically rich mud by ponds and streams. Adults recorded from May to August and have been observed visiting flowers such as umbels and shrub blossom.

STATUS A very local but widespread species with about 30 known post 1960 sites. Status revised from RDB3 (Shirt 1987).

THREAT The drainage of marshes for agriculture or intensive forestry and the removal of marginal vegetation from ponds and ditches; pollution such as agricultural run-off; mis-management of water levels with a subsequent loss of breeding sites and scrub invasion. The seepage sites are especially fragile and vulnerable.

MANAGEMENT Maintain a high stable water level and the presence of marshy areas around seepages and streamlets and employ rotational ditch and pond management where necessary to ensure all successional stages are present every year.
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