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Hammerschmidtia ferruginea

 
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stuart
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Joined: 11 May 2005
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Location: Peterborough, UK

PostPosted: Sat May 28, 2005 5:39 pm    Post subject: Hammerschmidtia ferruginea Reply with quote

Hammerschmidtia ferruginea (FallÚn, 1817)

Identification ease/difficulty: 2

StatusHabitat indicator statusSources of information
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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 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.

Hammerschmidtia ferruginea (FallÚn, 1817)

Biology: The larvae inhabit sap-runs or (more often) accumulations of decaying sap under the bark of recently dead, mature Populus tremula. Adults are usually found near the larval habitat, either sitting on trunks and stumps or visiting flowers nearby such as Salix and Rosa. They have been found visiting the flowers of Prunus padus in Sutherland (Entwistle quoted in Stubbs, 1996)

Distribution: A very rare species, recorded mainly from Speyside. A recent survey by the Malloch Society found larvae in 11 localities where mature groves of Populus tremula occurred. Stands of mature aspen are a scarce habitat and this species is regarded as very vulnerable
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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 Insect Red Data Book, Shirt, 1987 Reply with quote

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

Hammerschmidtia ferruginea[i] (Fallen, 1871) , formerly known as Brachyopa ferruginea ENDANGERED

Identification: Stubbs & Falk (1983), pp. 91 and 183, pl. 7:12.

Distribution: Only positively known from Strathspey (Highland) but there is another probable sighting from Torboll, south-east Sutherland. The population is believed to be small.

Habitat and ecology: Open structured woodland with birch [i]Betula
and aspenPopulus tremula. Its ecology is unknown but the related genus Brachyopa breeds in dead wood and sap runs. The adult has been reported from the stumps and trunks of aspen and birch, and also at flowers including rose Rosa. Recently three females were found at a large rot-hole in the side of a mature aspen, suggesting that this is the real breeding site.

Status: It has always been a great rarity; there are very few recent sightings and it is in danger of extinction. It was found at an aspen stand in Sutherland in 1984. Suitable breeding sites are few and large aspens with rot-holes are particularly rare. Its ecological requirements are poorly understood.Conservation: Recorded in one SSSI, but whether there is breeding here is unknown. There is a need for another SSSI in the Spey Valley to include the best historic locality where it still occurs.Threats: The removal and coniferisation of native deciduous woodland. Also the felling of aspens before maturity, when rot-holes and sap runs develop.

Author: A. E. Stubbs, using additional information from Coe (1953) and I. Perry (pers. comm.).
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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).

HAMMERSCHMIDTIA FERRUGINEA (Fallen) ENDANGERED

DISTRIBUTION Presently known from eight definite sites (all recent) along the Spey Valley between Kingussie, Easterness and Grantown, Elgin (old records for Aviemore , Nethy Bridge and Grantown are difficult to assign to actual sites); also three sites in E. Sutherland (Turboll, Arnaboll Wood and Achany).

HABITAT Aspen Populus tremula woodland, including birch or pine woods with an aspen component. There is a requirement for dead aspen trees.

ECOLOGY Larvae have mostly been found in fallen aspen trunks, though it is also possible that they use standing dead trees and living trees with some rot. Adults recorded from early June till mid July, resting on stumps, logs and sound trunks and also visiting flowers such as roses.

STATUS Regarded as an exceedingly rare Spey Valley speciality until 1976 when it was sighted at an E. Sutherland site. It has since been taken at two further sites in this vice county and is proving to be widespread in the mid Spey Valley, where six sites were located in 1982, plus six more in 1989. Careful searches of aspen woods throughout the Scottish Highlands may reveal an even wider distribution.

THREAT Clearance of aspen and other semi-natural woods with an aspen component in Scotland, largely for intensive forestry, and the removal of dead wood and large old trees.

MANAGEMENT Retain any dead wood, old or diseased trees and ensure continuity of these in the future.
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