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Didea fasciata

 
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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: Didea fasciata Reply with quote

Didea fasciata Macquart, 1834

Identification ease/difficulty: 3

StatusHabitat indicator statusSources of information
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Last edited by stuart on Sun Jan 22, 2006 11:28 am; edited 1 time in total
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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.

Didea fasciata Macquart, 1834

Biology: The larvae are aphidophagous and arboreal on both coniferous and deciduous trees. Adults are generally found in or near woodland, including conifer plantations and scrub, where the males aggressively defend sunlit patches. Typical localities include rides and clearings and tracks through trees

Distribution: Widespread throughout Britain. Whilst listed by Stubbs (1982) as a ‘good’ primary woodland indicator, records submitted to the recording scheme suggest that it occurs in woodlands of all types, including conifer plantations, secondary woodland and scrub
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stuart
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Joined: 11 May 2005
Posts: 737
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).

DIDEA FASCIATA Macquart NOTABLE

DISTRIBUTION Records scattered widely in England, Wales and Scotland though most frequent in ancient forest areas in the southern half of England.

HABITAT Broadleaved woodland and nearby open land.

ECOLOGY Larvae probably aphidophagous specialising on those aphids found in ancient broadleaved woodland, though on the continent it has been claimed to feed on Cinara piceae upon Abies alba. Adults recorded from May to October suggesting that two broods are present. Adults visit blossom such as hawthorn in the spring and umbels and composites throughout the flight period.

STATUS A very local species, not infrequent in the south, but becoming much rarer in the north and some of the Scottish records have been assigned to a different colour form (this may require further investigation). Nearly 60 post 1960 sites are known.

THREAT The clearance of ancient broadleaved woodland for agriculture or intensive forestry. The shading out of rides and clearings within woodland.

MANAGEMENT Ensure a good age mixture of the trees within sites including mature trees. Also maintain flower rich rides, clearings and wood edges for adult feeding.
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