[Invasive-species] Black and watch lists of invasive speciesinBelgium

Tue Feb 7 18:36:12 CET 2006

Dear Etienne,

if one bird species has a severe impact on vegetation in marshland it will be Branta canadensis. The Damvallei (Heusden, East-Flanders) was one of the nature reserves where the species appeared first in Flanders. Nowadays species-rich Calthions (among the best in Flanders) have turn into mud-flats and most of the watervegetation (among Stratiotes vegetations) completely disappaered due to grazing and eutrofication, Perhaps there are no scientific studies to document this but the evidence is clear. On the places with the highest density of Branta canadensis there is simply no more vegetation. The rich vegetation before is very good documented in several publication.

Wouter Van Landuyt

________________________________

Van: invasive-species-bounces at biodiversity.be namens BRANQUART Etienne
Verzonden: di 7/02/2006 17:29
Aan: Invasive alien species in Belgium
Onderwerp: Re: [Invasive-species] Black and watch lists of invasive speciesinBelgium

Dear colleagues,

I received several e-mails related to the inclusion or the exclusion of bird species in the black list/category A (e.g.  Alopochen aegyptiacus, Branta canadensis and Pisttacula spp.). Olivier Beck (IBGE-BIM) and Anne Weiserbs (AVES) suggest to include them in the list, mainly on the basis of the precautionary approach. One problem I see is that we do not have serious arguments to demonstrate that they are really detrimental to the environment, at least in the Brussels region (except noise and droppings). On the other hand, I know by Anny Anselin (INBO) that eradication of Branta candensis already started in Flanders... 

My position is as follows : if detrimental impact is proved > category A, if detrimental impact is only supposed > category B. That's why I would like to know if you are aware of scientific studies showing any detrimental impact of those bird species in Belgium or in neighbour areas. Thanks a lot in advance,

Etienne

	----- Original Message ----- 
	From: BRANQUART Etienne <mailto:E.Branquart at mrw.wallonie.be>  
	To: Invasive alien species in Belgium <mailto:invasive-species at biodiversity.be>  
	Cc: Maj De Poorter <mailto:m.depoorter at auckland.ac.nz>  
	Sent: Friday, February 03, 2006 6:18 PM
	Subject: [Invasive-species] Black and watch lists of invasive species inBelgium

	Dear All,

	I produced a first attempt of black and watch list of invasive species for Belgium (see word document here attached). Category definitions were modified to take into account remarks provided by Leo, Filip, Nora and Roger as much as possible ...

	We now have two main categories that include species with a potential impact on environment, public health or economy, i.e. black and watch lists. It has to be noted that I decided to include in the black list some species which are not yet really naturalised or do not develop large populations in Belgium but that are well known to produce detrimental impacts in neighbour areas (e.g. Aedes, Ambrosia, Ludwigia, etc.). I think it is important not to omit them so that our list can be used as a tool to eradicate the first populations of undesirable species soon after their arrival in Belgium, which is the most cost efficient way to get rid of them.

	The work file I used to categorise species is also attached (pdf file).  You will see that some species are still not included in any category as background information was missing... I hope I can rely on your own expertise on specific taxa to fill those gaps.

	I hope we will succeed to finalise these lists as a product of the Belgian Invasive Species Forum before the SOS invasions meeting (lists should be distributed to conference attendees !). Any remark, suggestion, addition to the discussion document are of course very welcome through the discussion list (general discussion) or through my e-mail address solely (minor remarks or corrections).

	Thank you in advance for your help. Have a very nice WE,

	Etienne

	PS: Few economic pest species are included in the lists up to now. Do you think it is feasible to add major culture pathogens and pests in the lists (including fungi, nematodes, etc.) ? Do you know if this information is already available somewhere (AFSCA ? EPPO ?...) ?

	==========================================================================

	Dr.  Etienne Branquart
	Belgian Biodiversity Platform (SPO)

	Ministere de la Region wallonne
	Centre de Recherche de la Nature, des Forets et du Bois (DGRNE)
	Avenue Marechal Juin, 23
	B-5030 Gembloux- Belgium

	Tel :   + 32 (0)81 620 420
	Fax :  + 32 (0)81 620 436
	E-mail : E.Branquart at mrw.wallonie.be
	URL: http://www.biodiversity.be

	==========================================================================

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