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Epistrophe diaphana

 
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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: Epistrophe diaphana Reply with quote

Epistrophe diaphana (Zetterstedt, 1843)

Identification ease/difficulty: 2

StatusSources of information
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Last edited by stuart on Mon Feb 06, 2006 11:11 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.

Epistrophe diaphana (Zetterstedt, 1843) Syrphus diaphanus Zetterstedt in Coe (1953)

Biology: Larva undescribed, but this genus are aphidophagous, and mainly associated with trees, but also shrubs and tall herbs. Usually occurs at woodland edge or in scrubby habitats where they can be found visiting flowers or resting on sunlit vegetation. Males hover at 2-4m in open patches. Adults visit white umbels and sometimes other flowers

Distribution: A scarce species, with most records coming from the southern counties of England
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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).

EPISTROPHE DIAPHANA (Zetterstedt) NOTABLE

DISTRIBUTION Records widely scattered in southern England from Kent to Cornwall and as far north as Worcestershire and Huntingdonshire.

HABITAT Broadleaved, woodland, especially margins and unimproved meadows nearby.

ECOLOGY Larvae aphidophagous though details unknown, other than that larvae of this genus are known to feed on aphids on leaves of shrubs and trees. Adults recorded from June to August.

STATUS Locally frequent in counties such as Oxfordshire, Wiltshire, East Hampshire (but not the New Forest) and Surrey, otherwise rather rare. Nearly 40 known post 1960 sites.

THREAT Clearance of old broadleaved woodland, and its afforestation. Drainage or pollution of unimproved, herb rich meadows, especially through river improvements as along one of its strongholds, the Basingstoke Canal.

MANAGEMENT Maintain known sites as deciduous woodland with herb rich rides, clearings and edges; also ensure a good age structure with old trees which may support the aphids this species feeds on.
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