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Criorhina ranunculi

 
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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: Criorhina ranunculi Reply with quote

Criorhina ranunculi (Panzer, [1804])

Identification ease/difficulty: 2

StatusHabitat indicator statusSources of information
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Last edited by stuart on Mon Oct 03, 2005 7:22 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.

Criorhina ranunculi (Panzer, 1804)

Biology: Larvae have been found in a rotting * stump. According to Speight (1989) in “almost certainly occurs in trunk-base, fungus-infected, wet-rot cavities” in a range of deciduous trees. Whilst large, old deciduous trees in woodland are probably the normal breeding habitat, females have been seen inspecting the bases of birch trees in heathland. Adults fly early in the spring and are usually seen visiting the blossom of early-flowering shrubs such as Prunus spinosa, and occasionally Crataegus, or basking on sunlit foliage. Males fly with a characteristic high-pitched whine

Distribution: Both the early flight period and the tendency to stay high up when visiting flowering shrubs may lead to this species being under-recorded. Whilst the bulk of records are from southern Britain, there are scattered records throughout the north including northern Scotland and around the Moray Firth. Recent observations suggest that it is locally abundant in some localities in north-west England
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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 9:08 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).

CRIORHINA RANUNCULI (Panzer) NOTABLE

DISTRIBUTION Records scattered widely in England, Scotland and Wales, predominating in the south.

HABITAT Broadleaved woodland with a requirement for dead wood. Small pockets of woodland seem to be utilised in addition to large woods.

ECOLOGY Larvae develop in dead wood, though the precise requirements are unknown. Adults recorded from March to early June (peak April) and frequent the blossom of sallow, sloe and cherry.

STATUS A widespread but very local species with about 40 known post 1960 sites, though the particularly early flight period could have led to some under recording. It can occasionally be found in good numbers at sites such as Windsor Forest and in other old woods.

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

MANAGEMENT Retain any dead wood and ensure future continuity by maximising the number of post mature trees within a site and encourage variety in the nature of dead wood. Maintain rides and clearings in an open condition with blossoms for adult feeding.
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