[Syrphidae] frost tolerance pupae Cheilosia Syrphidae

[André van Eck]

Hi Frank,

Only negatively influenced? 
Do you have any more specific information?

Fr. greetings, 
André van Eck


----- Original Message ----- 
From: Frank Dziock 
To: Hoverfly discussion list 
Sent: Tuesday, November 20, 2007 2:51 PM
Subject: [Syrphidae] frost tolerance pupae Cheilosia Syrphidae


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Dear Syrphid friends!

in an analysis of a European hoverfly data set we recognized that
especially the group of phytophagous species seems to be negatively
influenced by mean annual temperatures. One explanation could be that
Cheilosia overwinters as a pupa which might be potentially more
sensitive to freezing in Winter than species overwintering as a larva.

Are there any references concerning winter/frost hardiness of Syrphid
species overwintering as a pupa? (I know of the work by Hart et al.
concerning Syrphus ribesii (larval overwinterer) and Episyrphus and
Hondelmann for Episyrphus (adult overwinterer))

I would be very glad to receive any hints.

Best wishes from cold Berlin,

Frank





- --

Prof. Dr. Frank Dziock
Animal Ecologist and Head of Department (Juniorprofessor)

Department of Biodiversity Dynamics
Technische Universitaet Berlin
Sekr. AB 1
Rothenburgstr. 12
D - 12165 Berlin
Germany

Tel: 030 – 314 71368

Secretary Gisela Falk
gisela.falk at tu-berlin.de
Tel: 030 - 314 71350
Fax: 030 – 314 71355

http://www.tu-berlin.de/fb7/ioeb/biodiversitaet/

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