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Cheilosia sahlbergi

 
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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 sahlbergi Reply with quote

Cheilosia sahlbergi (Becker, 1894)

Identification ease/difficulty: 4

StatusSources of information
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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 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 sahlbergi Becker, 1894

Biology: The larvae have been found in association with Polygonum viviparum, where they seemed to be grazing externally on the roots (Rotheray, pers. comm.). Adults are found at high altitude (700m upwards) and have been recorded visiting the flowers of Potentilla erecta and Saxifraga spp. usually near water. They fly low and rapidly over the vegetation often perching on sun-lit stones and rocks in sheltered spots

Distribution: There are many records from the Ben Lawers area of central Scotland. The species has a rather restricted high-altitude habitat within which it is probably widespread
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stuart
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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 SAHLBERGI Becker VULNERABLE

DISTRIBUTION Restricted to a small number of sites in the Central Highlands of Scotland: Beinn A Chuallaich (post 1960), Ben Lawers (1977) and Loch Na Lairige, nr Ben Lawers (1979), Perthshire; Creag Meagaidh, Westerness (post 1980); Feshie, Easterness (1959); Carn Liath, Aberdeenshire (1964); Braeriach (1957) and Lurchers Gulley (1988) in the Cairngorms.

HABITAT Montane, well above the tree-line at altitudes of 760-915 metres, especially areas with base rich soils derived from the Moine Schist geological system.

ECOLOGY Larvae probably phytophagous though host plant unknown. Many montane herbs have a prostate and succulent rosette structure that would be ideal for larval development. Adults recorded from May to July and may be found visiting flowers such as saxifrages, buttercups and tormentil Potentilla erecta.

STATUS The montane habitat means this species may be overlooked to some extent. However if it is restricted to base rich areas the total area of suitable habitat could be rather limited. Status revised from RDB3 (Shirt 1987).

THREAT Degradation of fragile habitats from skiing and associated development, as well as trampling from hill walkers, with a resultant loss of vegetation and soil erosion. This species seems to occur too high for afforestation to be a problem.

MANAGEMENT Keep sites free from excessive disturbance and if this is impractical in areas already receiving high public pressure, then take measures to limit habitat damage including re-routing of paths. Ensure that seepages and other wet areas are not drained as part of path improvement. Resist ski developments that may have impact on base rich areas of mountains. Maintain traditional levels of deer or sheep grazing to ensure a continuity of the characteristic base rich montane flora.
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