[Syrphidae] frost tolerance pupae Cheilosia Syrphidae

[Frank Dziock]

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Sorry to have been so imprecise:

We took species lists for 38 European regions and looked for large-scale
correlations with environmental variables (a "macroecological"
approach). In a multiple regression analysis of the area-corrected no.
of species (corrected, because larger areas have more species) of the
phytophagous species group we saw a negative correlation of species
number in that group with AET (mean annual actual evapotranspiration)
and mean annual temperature.

So I thought, that "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.

I would be very glad if anybody could help with references concerning
winter/frost hardiness of Syrphid species overwintering as a pupa?

Best wishes from Berlin,

Frank



André van Eck schrieb:
> Hi Frank,
>  
> Only negatively influenced?
> Do you have any more specific information?
>  
> Fr. greetings,
> André van Eck
>  
>  
> ----- Original Message -----
> *From:* Frank Dziock <mailto:frank.dziock at tu-berlin.de>
> *To:* Hoverfly discussion list <mailto:syrphidae at nottingham.ac.uk>
> *Sent:* Tuesday, November 20, 2007 2:51 PM
> *Subject:* [Syrphidae] frost tolerance pupae Cheilosia Syrphidae
> 
> 
> 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
> 
> 
> 
> 
> 

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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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