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Cheilosia soror

 
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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 soror Reply with quote

Cheilosia soror (Zetterstedt, 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 8:40 am    Post subject: Species account from the Provisional atlas Reply with quote

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

Cheilosia soror (Zetterstedt, 1843) Cheilosia ruffipes (Preyssler)

Biology: The larvae are believed to inhabit fungi, and this species is reported to have been bred from truffles. Adults are strongly associated with chalk and limestone, where they have been found feeding on the flowers of white umbells, especially Heracleum and Pastinaca, in grassy rides and glades. According to Speight (1998) they are found in “clearings, tracksides, hedgerows, usually in partial shade”

Distribution: Records are widely scattered from chalk and limestone areas, mainly in eastern England, as far north as Morecambe Bay. Recent records from London suburbs suggest that it may be more widely distributed, possibly influenced by the calcareous content of concrete and rubble in urban areas
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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 SOROR (Zetterstedt) NOTABLE

DISTRIBUTION Recorded widely in chalk areas of southern England with records extending as far north as Durham and into South Wales.

HABITAT Calcareous grassland, scrub and woodland, with a very strong association with areas such as the North and South Downs, the Cotswolds and the Chilterns. Pockets of woodland nearby may be required for the larval development.

ECOLOGY Larvae developing in truffles which favour calcareous soils especially under beech. Adults recorded from July to September and are especially attracted to the flowers of umbels such as wild parsnip Pastinaca sativa and wild carrot Daucus carota.

STATUS Widespread but local in the south, with about 25 known post 1960 sites. There is some evidence to suggest a decline in this species, almost certainly attributable to the substantial loss of suitable habitat and the degradation of it through mis-management. It can still be locally abundant at some sites.

THREAT Habitat loss to agriculture or intensive forestry. Changes in the grazing management of chalk grassland with subsequent scrub invasion and a loss of floristic richness and diversity including nectar source flowers.

MANAGEMENT Maintain a mosaic of vegetation types on calcareous soils with woodland, woodland edges and adjacent grassland. On grassland use rotational grazing if necessary; limited scrub is probably acceptable. Maintain open rides and clearings in woods ensuring plenty of umbellifers for adult feeding.
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