[Syrphidae] Re: Syrphids as invasive species

[Francis Gilbert]

The list doesn't look like a list of invasives, but of a random set of pictures including a lot of invasives.

Surely most invasive species have colonised because of humans, whether deliberate or not, so the distinction does not seem to be a useful one. The key point is that most colonisations fail, however they occur in the forst place: it is the successful ones that become 'invasives' and the reasons for that success are interesting and worth studying.

Francis


From: syrphidae-bounces at lists.nottingham.ac.uk [mailto:syrphidae-bounces at lists.nottingham.ac.uk] On Behalf Of ximo mengual sanchis
Sent: 06 January 2015 16:20
To: Hoverfly discussion list
Subject: [Syrphidae] Syrphids as invasive species

Dear all,
I would like to continue with the discussion on introduced species, and if some of them may be considered 'invasive'.
In the webpage invasive.org<http://invasive.org>, dealing with invasive species for USA, there is a list of syrphids: http://www.invasive.org/browse/TaxImages.cfm?fam=475
I have a special interest in Simosyrphus grandicornis, which has been introduced to a number of Polynesian Islands and Hawaii. So, if this species has been introduced by humans, why now consider it as invasive?
Does anyone have more information about the introduction of S. grandicornis or its invasiveness?
Thanks for the helpful comments.
Best wishes,

Ximo
********************************************************
Dr. Ximo Mengual
Head of the Diptera Section
Stiftung Zoologisches Forschungsmuseum Alexander Koenig
Leibniz-Institut für Biodiversität der Tiere
Adenauerallee 160
D-53113  Bonn, Germany
Phone: 0049 (0)228 9122 292
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