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Chalcosyrphus eunotus

 
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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: Chalcosyrphus eunotus Reply with quote

Chalcosyrphus eunotus (Loew, 1873)

NomenclatureIdentification ease/difficulty: 3

StatusHabitat indicator statusSources of information
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Last edited by stuart on Wed Jun 01, 2005 10:00 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 8:40 am    Post subject: Species account from the Provisional atlas Reply with quote

Species account from Provisional atlas of British hoverflies, Ball & Morris, 2000.

Chalcosyrphus eunotus (Loew, 1873) Brachypalpus eunotus Loew, 1873 in Coe (1953) and Kloet & Hincks (1976)

Biology: The larvae are found in sap-runs and other accumulations of sap under bark. It has also been bred from an artificial rot hole on the Continent. This species may be especially associated with dead wood lying in water, as adults are nearly always found in association with small streams and have been seen sitting on partially submerged logs in streams. Males appear to patrol small to very small streams, frequently resting on logs and projecting stones (Speight (19998). In the field, it is extremely similar in appearance to Brachypalpus laphriformis.

Distribution: A rare species with recent records from woodlands in Dorset, Gloucestershire and the Welsh borders, including a locality near Wrexham, and another on the River Monnow in Wales. It is possibly under-recorded because of its early flight period
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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).

[i]Chalcosyrphus eunotus[i] (Loew, 1873) , formerly known as [i]Brachypalpus eunotus[i] VULNERABLE

Identification: Stubbs & Falk (1983), pp. 110 and 221, pl. 10:7.

Distribution: Hereford & Worcester, and Oxfordshire (that part formerly in Berkshire).

Habitat and ecology: Undoubtedly breeds in dead wood but nothing is known of the early stages. Since the adult has been found on a log resting in a stream, and flying over a shaded pool, it is possible that it breeds in semi-submerged logs, but this remains far from proven.

Status: Has only been found on four occasions, two of them in 1899 near Ledbury (Hereford & Worcester). In 1953 one was found at Cothill (Oxfordshire) and another in the Wyre Forest in 1977. There is thus only one recent record of this very rare species and nothing is known of management needs; possibly this species should be classified as Endangered, but the Welsh Borders are poorly recorded at present.Conservation: Cothill and Wyre Forest are NNRs.

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 9:08 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).

CHALCOSYRPHUS EUNOTUS (Loew) VULNERABLE

DISTRIBUTION Only six known sites within the Welsh Borders and southern England: Knapp and Paper Mill N.R., Alfrick (1986 and 1987), Shrawley Wood, nr Stourport (1986 and 1987) and an unspecified site in the Wyre Forest (1971), all in Worcestershire; Cothill NNR, Berkshire (1953); Ledbury, Herefordshire (1899) and Bracketts Coppice, Dorset (1987).

HABITAT Old broadleaved woodlands with streams.

ECOLOGY Larvae probably develop in dead wood. Most records apply to adults sitting on partly submerged logs, strongly suggesting that the larvae live in semi-submerged wood. Adults recorded in May and June.

STATUS Four post 1960 sites. It may prove to be more widespread along the Welsh borders with more thorough searching and the Dorset record is encouraging. This species is likely to remain vulnerable through the apparently specialised choice of breeding site.

THREAT Unclear, but probably the clearance of old woodland sites and removal of dead wood, especially semi-submerged logs.

MANAGEMENT Maintain known sites as broadleaved woodland, retaining any semi-submerged logs and ensure a continuity of dead wood in future by maximising the number of diseased and post mature trees.
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