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Eristalis rupium

 
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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: Eristalis rupium Reply with quote

Eristalis rupium Fabricius, 1805

Identification ease/difficulty: 3

StatusSources 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.

Eristalis rupium Fabricius, 1805

Biology: The larvae are of the ‘long-tailed’ type and are apparently aquatic in clean-water situations, such as spring-fed permanent streams. Adults are usually found in fairly open situations such as wet meadows and streamsides with abundant flowers, often in the uplands (to about 300m). They can sometimes be found in glades in conifer plantations where flowers are abundant

Distribution: This is a northern and western species which can be very local, even in apparently suitable areas. Care is needed in identification as it is easily confused with E. interruptus and E. horticola
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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).

ERISTALIS RUPIUM Fabricius NOTABLE

DISTRIBUTION Recorded widely in the hilly areas of Wales, northern England and Scotland.

HABITAT Upland areas with a preference for lush marshy spots with plenty of flowers either in sheltered valley bottoms and forest glades or more rarely in exposed situations up to 300m.

ECOLOGY Larvae aquatic, probably in pools, but whether acidic or basic conditions are required is unknown, though pH may be an important factor. The larvae are of the rat tailed maggot type. Adults recorded from June to September.

STATUS Very local, but not infrequent in upland areas with in excess of 45 known post 1960 sites. It can occur in local abundance.

THREAT The drainage of upland bogs and marshes for improved pastureland and for afforestation.

MANAGEMENT Maintain a high, stable water level in marshy areas, ensuring the presence of pools and ditches for the larvae and a rich and varied surrounding vegetation. Such sites should not be heavily grazed.
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