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Eupeodes nielseni

 
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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: Eupeodes nielseni Reply with quote

Eupeodes nielseni (Dusek & Láska, 1976)

NomenclatureIdentification ease/difficulty: 4

StatusHabitat indicator 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.

Eupeodes nielseni Dusek & Laska, 1976 Metasyrphus nielseni Dusek & Laska in Stubbs & Falk (1983)

Biology: The larvae are aphidophagous and associated with aphids on conifers. E. nielseni is a little-known species, described for the first time in 1976. Adults have been found mainly at the edges of mature Pinus forest, where they visit flowers such as Potentilla erecta, Sorbus and Salix repens, but have also been found in partially-coniferised deciduous woodland. According to Speight (1998) they are largely arboreal

Distribution: There are very few records; the majority are from the Scottish Highlands but there are a few from scattered localities in southern England. It is possible that this species is spreading in conifer plantations in the south, and will be found more widely in future
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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).

METASYRPHUS NIELSENI Dusek & Laska NOTABLE

DISTRIBUTION Most records are for the Scottish Highlands (Perthshire, Aberdeenshire, Elgin, Easterness) with recent records for south Northumberland and a dubious site in Oxfordshire and older ones for Cheshire and Westmorland.

HABITAT Coniferous woodland, and adjacent heathland. A strong association is shown with Caledonian pine forests though the English records are linked to conifer plantations.

ECOLOGY Larvae aphidophagous upon pines, Pinus sylvestris certainly being used and possibly non-native conifers. Adults recorded from May to October probably as two or more broods, and frequent the flowers of tormentil Potentilla erecta, dwarf sallow Salix repens and rowan Sorbus aucuparia.

STATUS Regular in some Caledonian pine forests, perhaps even locally frequent with about eight known sites and the English records suggest some powers of dispersal, though not as strong as many other pine-associated hoverflies. The close resemblence to certain other Metasyrphus species and the fact that it was only described as new to science in 1976 may have led to it being partly overlooked. However, recent doubts about some features used for the separation of M. nielseni from M. nitens mean that English records should be treated with caution.

THREAT The clearance of open structured Caledonian pine forests in Scotland mainly for intensive forestry, and overgrazing of the ground flora by deer.

MANAGEMENT Maintain the open structure which should be typical of Caledonian pine forest, with shrubs and flowers for adult feeding.
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