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Eriozona erratica

 
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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: Eriozona erratica Reply with quote

Eriozona erratica (Linnaeus, 1758)

NomenclatureIdentification 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 8:41 am    Post subject: Species account from the Provisional atlas Reply with quote

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

Eriozona erratica (Linnaeus, 1758) Syrphus annulipes Zetterstedt in Coe (1953), Didea annulipes (Zetterstedt) in Rotheray (1994), Megasyrphus annulipes (Zetterstedt) in Stubbs & Falk (1983)

Biology: The larvae are aphidophagous, and usually associated with conifers ( Abies, Picea and Pinus), although they are also known to feed on other arboreal aphids such as those on Salix. Adults are often associated with open rides and glades in conifer plantations, where they visit a wide range of flowers. They are easily confused with Syrphus in the field, but the thorax is quite noticeably blacker and shiny, and in life the markings are orange rather than yellow

Distribution: This widespread species was formerly regarded as very scarce, but it has been recorded more frequently in recent years, possibly because recorders have paid more attention to rides in conifer plantations. It is also possible that its populations undergo large fluctuations, resulting in large numbers of records being received following occasional good years. For example, 40% of all records submitted to the recording scheme date from 1992 and 1993
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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).

MEGASYRPHUS ANNULIPES (Zetterstedt) NOTABLE

DISTRIBUTION Records widely dispersed in England, Wales and Scotland.

HABITAT Exact requirements unclear, though often found in coppiced woodland, at woodland edges and in rides.

ECOLOGY Larvae aphidophagous though on what species is unknown. Goeldin (1975) recently described the larva and reared this species almost to pupation on Aphis fabae (bean aphis) in the laboratory. The larvae are likely to be arboreal in the wild. Adults recorded from April to October.

STATUS A very local and declining species, most frequent in Scotland. About 15 known post 1960 sites with older records comparatively numerous.

THREAT Clearance of native woodland for agriculture or intensive forestry. The shading out of rides and clearings within woodland.

MANAGEMENT Maintain open rides and clearings in woods, using rotational clearance if necessary, ensuring flowers for adult feeding. Maintain a good age structure of trees including mature ones which may support suitable aphids.
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