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Cheilosia mutabilis

 
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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: Cheilosia mutabilis Reply with quote

Cheilosia mutabilis (Fallén, 1817)

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 8:40 am    Post subject: Species account from the Provisional atlas Reply with quote

Species account from Provisional atlas of British hoverflies, Ball & Morris, 2000.

Cheilosia mutabilis (Fallén, 1817)

Biology: The larvae have been found in the roots of Carduus acanthoides. Adults are recorded from a variety of habitats including marsh and fen, scrub, woodland, acid heath and dunes. Speight (1998) lists “well-drained sites often susceptible to short-duration winter flooding” amongst its preferences and notes that in the north of its range (Denmark, Sweden, N. Germany) it is primarily coastal

Distribution: Older records indicate a wide distribution north to Central Scotland, but there is a marked concentration of recent records in Cheshire, South Lancashire and South Yorkshire, and a number of records from large dune systems in Wales and north-west 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 9:09 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).

CHEILOSIA MUTABILIS (Fallen) NOTABLE

DISTRIBUTION Old records show a very wide distribution in Britain, extending up to the Scottish Highland where it was once quite frequent. Recent records however are few, though they include North Wales.

HABITAT Records include heathland, moorland, grassland, woodland rides and clearings.

ECOLOGY Larvae phytophagous, reared from the roots of welted thistle Carduus acanthoides. Adults recorded from March to August suggesting the presence of two broods.

STATUS Very local and possibly declined with about 20 known post 1960 sites, scattered widely throughout the known range. Status revised from RDB3 (Shirt 1987).

THREAT Loss of suitable habitat to agriculture and intensive forestry; also changes in the grazing management of sites, leading to the invasion of scrub and coarse grasses and a subsequent fall in floristic richness and diversity.

MANAGEMENT This should concentrate upon maintaining a healthy thistle population. Rotational grazing policies are advised in order to produce a mosaic of vegetation types; also maintain open rides and clearings in woods.
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