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Melanogaster aerosa

 
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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: Melanogaster aerosa Reply with quote

Melanogaster aerosa (Loew, 1843)

NomenclatureIdentification ease/difficulty: 4

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.

Melanogaster aerosa (Loew, 1843) Chrysogaster macquarti Loew in Stubbs & Falk (1983)

Biology: The larvae are aquatic living beneath the surface of semi-liquid, enriched mud near plant roots where there is no water movement. Typically occur in acid bogs and flushes and around small moorland streams, although they may also be associated with ditches on alluvial levels. Adults are usually swept, or found visiting flowers, close to water

Distribution: This mainly northern and western species is widespread in acid areas but rarely abundant. Care is needed with identification, as this species is difficult to separate from M. hirtella, which often occurs in similar places but flies later in the year
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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).

CHRYSOGASTER MACQUARTI Loew NOTABLE

DISTRIBUTION Records widely dispersed in England, Scotland and Wales, becoming more frequent towards the north.

HABITAT Boggy marshes and flushes; usually associated with acid conditions, though occasionally taken on non-acid marshes.

ECOLOGY Larvae develop in the mud at the base of aquatic plants and, being very closely related to C. hirtella, they are assumed to obtain oxygen using modified hind spiracles for penetrating air spaces within aquatic plants. Adults recorded from June to September and may be found on flowers of tormentil Potentilla erecta, buttercups and composites.

STATUS A local species with about 30 post 1960 sites, most frequent in the north and especially along the Spey Valley. Its separation from the common Chrysogaster hirtella is difficult and could have resulted in some under recording. Status revised from RDB3 (Shirt 1987).

THREAT Drainage of bog areas for agricultural improvement or intensive forestry. A fall in water level can also encourage the invasion of scrub and coarse grasses.

MANAGEMENT Maintain open peatland habitat with a high, stable water table, preventing scrub invasion. Maintain the presence of pools and ditches and lush marginal conditions.
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