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Pocota personata

 
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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: Pocota personata Reply with quote

Pocota personata (Harris, [1780])

Identification ease/difficulty: 2

StatusHabitat indicator statusSources of information
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Last edited by stuart on Wed Jun 01, 2005 10:04 pm; 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.

Pocota personata (Harris, 1780)

Biology: The larvae are found in rot holes high above the ground in various trees, but most frequently * and Populus. Larval development probably takes a number of years and larvae of different size classes can be found together in the same rot hole. Adults are good bumblebee mimics and are seldom found, but can sometimes be seen visiting flowers, especially Crataegus blossom, near larval habitat. They have also been observed hovering about the entrances to rot holes.

Distribution: A rare species, restricted to woodlands and parklands with ancient trees, although there are (mostly old) records from urban localities like Hampstead Heath and Blackheath in London, and Banbury Road, Oxford. It is mainly recorded from the forest belt of central-southern England, with the majority of records coming from “classic dead-wood localities” like Windsor Forest and the New Forest, but there is a scatter of records elsewhere in the southern half of Britain, extending northwards through the Welsh border counties to the Wirral. Duncombe Park in North Yorkshire is rather isolated from the main distribution and the most northerly locality known. Records from the eastern side of the country mostly date from the 1930s and 40s or earlier
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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 Insect Red Data Book, Shirt, 1987 Reply with quote

Datasheet from the Insect Red Data Book, Shirt (1989).

Pocota personata (Harris, 1780) VULNERABLE

Identification: Stubbs & Falk (1983), pp. 110 and 222, pl. 10:11.

Distribution: Mainly southern England, but sparse records extend to Devon and Nottinghamshire.

Habitat and ecology: Breeds in rot-holes in trees, usually high above ground. It occurs in ancient forests but there are few records in other places.

Status: This has always been a rarity though on a few occasions it has been reared in numbers from a concentration of larvae in rot-holes. Currently it is rare even in major ancient forests such as Windsor Forest and the New Forest, and modern records outside these are very infrequent.

Author: A.E. Stubbs.
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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).

POCOTA PERSONATA (Harris) VULNERABLE

DISTRIBUTION Southern England, extending as far north as Yorkshire and west to Devon, with most records for Windsor Forest, Berkshire and the New Forest.

HABITAT Broadleaved woodland and parkland, almost exclusively in ancient sites with a requirement for old trees with rot-holes.

ECOLOGY Larvae develop in rot holes of old trees at some height above the ground. Beech is especially favoured, though poplar may also be used. Adults are recorded from April to June and may be found hovering around tree trunks or on umbels and hawthorn blossom. Certain trees seem to provide regular sightings at least in Windsor suggesting the breeding sites are rather specialised and few.

STATUS Infrequent except for Windsor and a handful of New Forest sites where it is regularly seen. Additional post 1960 records exist for Colehays Park, Devon (1979); a site in Dorset (1986); Blackheath (1964, 1966) and Malling Down SSSI (1985), Kent and a sighting at Duncombe Park, Yorkshire (1983) It is possible that adults are partly overlooked due to the height of the breeding sites and a largely canopy-dwelling habit. Larvae have been found in profusion in suitable rot holes, but such breeding sites are rarely numerous within an area of woodland and such a specialised choice of site places this species in a particularly vulnerable position as a large number of old trees would be required to provide a continuity of such sites from one year to the next.

THREAT The clearance of ancient broadleaved woodland and parkland, especially for intensive forestry and the removal of large post mature trees with rot holes, within these sites. Shading out of rides and clearings within woodland.

MANAGEMENT Retain all large post mature and diseased trees within a site and ensure a continuity of these in the future. Maintain rides and clearings in an open condition with blossoms for adult feeding.
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