Return to HRS home page Dipterists Forum
A Dipterists Forum recording scheme

Navigation
Home
Forum
Photo gallery
Maps
Checklist
Hoverfly Newsletter
Memberlist
User-groups
FAQ
Search

User
Username:

Password:

 Remember me



I forgot my password

Don't have an account yet?
You can register for FREE


Search

Advanced Search

Who is Online

In total there are 3 users online :: 0 Registered, 0 Hidden and 3 Guests

Registered Users: None

[ View complete list ]


Most users ever online was 248 on Wed Dec 12, 2007 11:53 pm


Parasyrphus nigritarsis

 
Post new topic   Reply to topic    Hoverfly Recording Scheme Forum Index -> The Species
View previous topic :: View next topic  
Author Message
stuart
Site Admin


Joined: 11 May 2005
Posts: 737
Location: Peterborough, UK

PostPosted: Sat May 28, 2005 5:39 pm    Post subject: Parasyrphus nigritarsis Reply with quote

Parasyrphus nigritarsis (Zetterstedt, 1843)

Identification ease/difficulty: 4

StatusSources of information
Back to top
View user's profile Send private message Send e-mail
stuart
Site Admin


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.

Parasyrphus nigritarsis (Zetterstedt, 1843) Syrphus nigritarsis Zetterstedt in Coe (1953)

Biology: The larvae feed on the eggs, larvae and pupae of leaf beetles (Coleoptera, Chrysomelidae) associated with Alnus, Populus and Salix. Adults have been found resting on the foliage of trees and scrub, often close to wet woodland or waterside trees, and males were recorded in three consecutive years sitting on a plastic coated washing line in the garden of Adrian Fowles in west Wales, adjoining a wooded valley with Salix cinerea and Populus tremula

Distribution: The status and distribution is reviewed by MacGowan & Watt (1994), although the recording scheme holds some additional records. It was originally described from specimens taken in central Scotland, and, although there are recent records from a number of Scottish localities, these are outnumbered by records from south and west Wales. It has also been reported from Cornwall, northern-England, Suffolk and Hampshire. It is possibly overlooked because of its resemblance (especially in the female) to the common Syrphus spp
Back to top
View user's profile Send private message Send e-mail
stuart
Site Admin


Joined: 11 May 2005
Posts: 737
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]Parasyrphus nigritarsis[i] (Zetterstedt, 1843) ENDANGERED

Identification: Stubbs & Falk (1983), pp. 69 and 1843).

Distribution: The Scottish Highlands.

Habitat and ecology: The larvae are recorded (on the Continent) as feeding on the eggs and larvae of chrysomelid beetles. The habitat details in Britain are unknown.

Status: There are only a few British specimens, all old. This is one of four British hoverflies which have not been confirmed as occurring in Britain in the post-1970 period.

Author: A. E. Stubbs.
Back to top
View user's profile Send private message Send e-mail
stuart
Site Admin


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).

PARASYRPHUS NIGRITARSIS (Zetterstedt) ENDANGERED

DISTRIBUTION A few individuals (females) are known from the Scottish Highlands: Grantown, Elgin (1937) and Morrone Birkwood, Aberdeenshire (needs confirmation). More recently, a series of males were taken in a garden at Rhyd y Gwin, Cardiganshire (1987, 1988) and a single male from Scotchwell Path, near Haverfordwest, Pembrokeshire (1988).

HABITAT Usually in the vicinity of damp broadleaved woodland.

ECOLOGY Abroad, young larvae have been recorded feeding on larvae of chrysomelid beetles (Galerucella and Leptinotarsa) and aphids (Rhopalosiphoninus). Larger larvae require the larvae of another chrysomelid, Melasoma and it is possible that a range of related beetles are also used. Adults recorded in May and June.

STATUS A very poorly known hoverfly which has recently been rediscovered at two sites in south-west Wales. The great resemblance to common species of the genus Syrphus should be noted, and it may prove to be under recorded. Abroad the species is a northern European and Alpine species.

THREAT Clearance of native woodland for intensive forestry and agriculture. At Morrone, excessive grazing by deer appears to be having a detrimental effect on the ground flora and tree regeneration, which could be affecting this species. The shading out of rides and clearings within woods is also likely to be deleterious.

MANAGEMENT Maintain native broadleaved woodland in a natural state, with at least some open structured areas. Use fenced compartments to exclude deer and encourage a herb rich ground flora and some tree regeneration at sites such as Morrone Birkwood.
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    Hoverfly Recording Scheme Forum Index -> The Species All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group