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Platycheirus perpallidus

 
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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: Platycheirus perpallidus Reply with quote

Platycheirus perpallidus (Verrall, 1901)

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.

Platycheirus perpallidus Verrall, 1901

Biology: The larvae are associated with the aphid Trichocallis cyperi on Carex spp. in wetlands. It occurs along the margins of ditches, ponds and rivers, especially in wet poor fen where Carex occurs. Adults fly amongst stands of tall, emergent vegetation. Usually found by sweeping, but they seem to prefer the open-water side of vegetation stands which can make them inaccessible

Distribution: This is a very local species, which may nevertheless be abundant where it occurs. It is most frequent in Wales, northern England and Scotland, especially the Central Highlands. It is rare in southern Britain
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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 9:09 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).

PLATYCHEIRUS PERPALLIDUS Verrall NOTABLE

DISTRIBUTION Records widely dispersed in in the NW half of England, Wales and Scotland with most records from the Scottish Highlands.

HABITAT Marshes, especially where sedges (e.g. Carex rostrata) grow in wet poor fen or boggy areas at the margins of ponds, lakes and rivers.

ECOLOGY Larvae probably aphidophagous though details unknown. Adults recorded from May to August and are known to feed on the pollen of sedges.

STATUS Extremely local in Britain as a whole with about 35 known post 1960 sites though locally frequent in parts of the Scottish Highlands. Status revised from RDB3 (Shirt 1987).

THREAT The drainage of wetlands for agricultural improvement or afforestation. River improvement schemes and the loss of marginal vegetation through clearance, excessive trampling or overgrazing. Pollution such as agricultural run-off.

MANAGEMENT Maintain a high stable water level and ensure a full succession or mosaic of vegetation types including pools and ditches and their marginal vegetation.
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