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Chrysotoxum elegans

 
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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: Chrysotoxum elegans Reply with quote

Chrysotoxum elegans Loew, 1841

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.

Chrysotoxum elegans Loew, 1841

Biology: Larva has been described from a fully grown specimen found beneath a stone in grassland. Found in a variety of well drained, grassy situations ranging from woodland edge and scrubby downland in south-east England, to open cliff-tops in the south west. Adults fly low and fast over low vegetation and visit flowers, including white umbels and Ranunculus.

Distribution: Very scarce, but widely distributed in southern England, this species becomes more frequent towards the south-west where it is often, but not exclusively, associated with coastal habitats
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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).

CHRYSOTOXUM ELEGANS Loew RARE

DISTRIBUTION Records widely dispersed in southern England as far north as Worcestershire, Northamptonshire and Norfolk and also into South Wales. Many records are from coastal areas.

HABITAT Usually found on dry, open grassland, though it has been seen in dense woodland.

ECOLOGY Larval habits unknown though possibly predators of root aphids or in ants nests. Adults recorded from May to September and may be found visiting the flowers of umbels, shrub blossom such as elder or sunbathing on foliage. Males may be found hovering in loose swarms above grassland at a height of 3 to 4 ft.

STATUS Most regularly taken in counties such as Hampshire, Dorset, Cornwall and Devon, otherwise infrequent and declining. About 15 post 1960 sites known, though old records are numerous and often refer to its local abundance.

THREAT The loss of coastal grassland and woods to arable agriculture and intensive forestry. Recreational pressures, including building development, are a threat in the coastal belt. Vast areas of suitable habitat have been lost this way and probably account for its decline.

MANAGEMENT Prevent the invasion of scrub or coarse grasses on coastal grassland. Grazing may be necessary to produce a mosaic of short vegetation types, especially if ants are involved in the larval development. Maintain the presence of rides and clearings in woods.
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