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Melanostoma form A

 
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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: Melanostoma form A Reply with quote

Melanostoma form A sensu Stubbs & Falk, 1983

Identification ease/difficulty: 5

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.

Melanostoma form A sensu Stubbs, 1983

Biology: Biology unknown. Suggested by MacGowan & Rotheray (quoted in Stubbs, 1996) to be part of an altitudinal cline between M. mellinum at low altitude and M. dubium at high altitude, this form representing an intermediate ecotype

Distribution: Based on a series taken in the Cairngorms along the tree line in Glen Einich, but there a few similar specimens in the British Museum collection from central Scotland
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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).

MELANOSTOMA Form A Stubbs & Falk NOTABLE

DISTRIBUTION Known from a handful of sites in the Scottish Highlands: Derry Lodge, Aberdeenshire (1970); Glen Einich (recent) and Loch Avon (pre 1960), Easterness; Beinn Heagarnich (1932), Perthshire; Glen Shiel to Glen Quoich, Ross (1934).

HABITAT Montane bogs with most records (perhaps all) above 700m.

ECOLOGY Larvae probably aphidophagous. Adults recorded in June and July.

STATUS A very poorly known species which is exceedingly hard to identify. It may be a form of the common C. mellinum.

THREAT The drainage of upland bog areas, for improved pastureland or afforestation of lower slopes of mountains. Skiing could be a problem in some areas leading to soil erosion and a loss of vegetation.

MANAGEMENT Maintain the natural hydrology and vegetation communities of montane bogs ensuring their freedom from excessive disturbance.
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