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Pipizella viduata

 
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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: Pipizella viduata Reply with quote

Pipizella viduata (Linnaeus, 1758)

NomenclatureIdentification ease/difficulty: 3

Sources 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.

Pipizella viduata (Meigen, 1822) Pipizella varipes (Meigen) in Stubbs & Falk (1983)

Biology: The larvae are associated with ant-attended, root-feeding aphids on white umbells (e.g. Anauraphis subterranea attended by Lasius niger on the roots of Pastinaca sativa). Generally found by sweeping dry grassland (including calcareous and coastal grassland), dry heathland and woodland rides, or seen visiting low flowers, especially Galium, Pastinaca and other white umbells. Adults will bask on sunlit leaves, but generally stay close to the ground

Distribution: A widespread and common species found in suitable localities throughout Britain, although most frequent in the southern lowlands
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stuart
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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).

PIPIZELLA VIRENS (Fabricius) NOTABLE

DISTRIBUTION Records widely dispersed in southern England with isolated ones extending as far north as Yorkshire.

HABITAT Uncertain, known sites include woods, fens, coastal marshes and commons, perhaps with a preference for dry grassland and woodland rides and margins.

ECOLOGY Larvae reported abroad as feeding on aphids on the roots of umbelliferous plants. Adults recorded from May to July.

STATUS Very local, though not infrequent in some parts of the south (Essex, Kent, Dorset), with about 20 known post 1960 sites. Records of P. virens in old literature may refer to the commoner P. varipes.

THREAT Habitat loss to agriculture, intensive forestry. Mis-management of grassland with subsequent loss of certain vegetation elements and invasion by scrub and bracken.

MANAGEMENT Maintain a mosaic of vegetation types including rides and clearings in woods, retain a mosaic of vegetation types on heathland using traditional management techniques to prevent scrub invasion, and employ rotational grazing policies on grasslands.
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