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<DIV><FONT face=Arial size=2>Dear Etienne, Ton and all Colleagues,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Sorry for the former message, same subject, not
completed and sent mistakenly. Please erase it.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>In answer to Etienne's list and to Ton's remarks,
please find hereunder information in order to update the list of -more or
less detrimental- exotic freshwater species in Belgium, specially in the
Southern part of Belgium.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>First of all, you'll find the recent situation
concerning Crustacea, Mollusca & Polychaeta in three recent papers
(reprints available on request):</FONT></DIV>
<DIV><FONT face=Arial size=2>
<P>JOSENS, Guy, Abraham BIJ DE VAATE, Philippe. USSEGLIO-POLATERA, Roger
CAMMAERTS, Frédéric CHEROT, Frédéric GRISEZ, Pierre VERBOONEN and Jean-Pierre
VANDEN BOSSCHE, 2005. Native and exotic Amphipoda and other Peracarida in the
River Meuse : new assemblages emerge from a fast changing fauna. H. Segers
& K. Martens (eds) , Aquatic Biodiversity II. <I>Hydrobiologia</I>
542 : 203 – 220.</P></FONT></DIV>
<DIV><FONT face=Arial size=2>VANDEN BOSSCHE, J.P., CHEROT, F., DELOOZ, E.,
GRISEZ F.and JOSENS, G., 2001. First record of the Pontocaspian invader
<I>Hypania invalida</I> (Grube, 1860) (Polychaeta : Ampharetidae) in the
River Meuse (Belgium). Belg. J. Zool., 131 (2) : 183-185.</FONT></DIV>
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<DIV><FONT face=Arial size=2>VANDEN BOSSCHE, J.P., 2002. First records and fast
spread of five new (1995-2000) alien species in the River Meuse in
Belgium : <I>Hypania invalida</I>, <I>Corbicula fluminea</I>, <I>Hemimysis
anomala</I>, <I>Dikerogammarus villosus</I> and <I>Crangonyx pseudogracilis.
</I>In : Peeters, M. & Van Goethem, J.L., Proceedings of the symposium
" Belgian fauna and alien species ", Bulletin de l’Institut royal des
Sciences naturelles de Belgique, Biologie, 72-SUPPL. : 73-78.
Bruxelles.</FONT></DIV>
<OL>
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<DIV><FONT face=Arial size=2>On March, 17th, 2005, I sent a message to the
BFIS-yahoogroup (which is reproduced hereunder) that may still help
to complete the list and answer to most of Ton's remarks: </FONT></DIV>
<DIV><FONT face=Arial size=2>"Dear colleagues, </FONT><FONT face=Arial size=2>In
December 2001, a symposium "Belgian fauna & alien species" was held at the
RBINS. One can find the situation of most of the freshwater invasive
species inits procceedings, mainly in the papers of Rose Sablon, Karel Wouters
(see also Bulletin de l'Institut Royal des Sciences naturelles de Belgique,
Biologie, 72: 119-129, 2002) and J.P. Vanden Bossche. In addition to Guy Josens'
proposal, we could also add some new entries & additional information,
refering to the papers cited above and to more recent observations:<BR><BR>About
Crustaceans:<BR>Eriocheir sinensis, origin E Asia, recorded in Belgium in 1933,
considered in the 1950's as "pest" and "public enemy" , FREW,MAR Range**,
Impact: predation, habitat (futher information needed: ask Jean-Claude
Phillipart, ULg)<BR>Astacus leptodactylus: E Europe, 1960's (?) FREW Range **
Impact: predation,competition<BR>Pascifastacus leniusculus: origin N Am, 1980's,
FREW Range *** (escaped from ponds, expanding quickly in natural rivers in
Wallonia) Impact: predation, competition<BR>Orconectes limosus: N Am, early
1960's, FREW Range *** (stabilised in Meuse River, expanding in natural rivers
in Wallonia) Impact: predation, competition<BR>Procambarus clarkii N AM
(southern USA), 1980's, FREW Range * Impact: seemingly presently
neglectible<BR><BR>About Molluscs (ask confirmation to Rose Sablon):<BR>Anodonta
woodiana: origin E Asia, in B 1999, FREW Range*, Impact: threat if
expanding: habitat & competition<BR>Corbicula fluminea: origin E Asia,
in B 1992, Range **, increasing populations in canalised rivers (Meuse...) ,
Impact habitat<BR>Dreissena polymorpha: origin¨Ponto-Caspian, in B 1850's,
Impact habitat competiton & fouling<BR><BR>About Polychaeta:<BR>Hypania
invalida: origin Ponto-Caspian, in B 2000, FREW,MAR. Range **,increasing
populations in canalised rivers (Meuse...) Impact: habitat competiton &
fouling<BR><BR>I think that we may be more precise about the origin: i.e. change
"Asia" to "Ponto-Caspian" for Ponto-Caspian spp (as Ponto-Caspian = SE
Europe + SW Asia)<BR>I think also that we should be open minded concerning the
"detrimental impact" statement, as it could change rapidly according to
populations changes and/or to new observations. Consequently, the list could be
open to the "invasive" (or new) species, even if not (not yet or not
anymore)classified as "worst". Best regards, Jean-Pierre Vanden
Bossche"</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>In addition, following Ton's remarks, we can
confirm:</FONT></DIV>
<DIV>1. Corbicula fluminalis is actually present in Belgium;</DIV>
<DIV>2. D. polymorpha, C. curvispinum, Dikerogammarus spp., Hemimysis anomala
are of course Ponto-Caspian species (see above);</DIV>
<DIV>3. Astacus leptodactylus originates from E Europe;</DIV>
<DIV>4. D. haemobaphes is actually present in Belgium (River Meuse), male &
female specimens, since 1998 (Josens et al, 2005);</DIV>
<DIV>5. Orchestia cavimana originates from Ponto-Caspian to East Mediterranean
area (S-E Europe);</DIV>
<DIV>6. Hemimysis anomala is actually present in Belgium (River Meuse),
first record 2000 (Vanden Bossche, 2002); no detrimental effect known;</DIV>
<DIV>7. Limnomysis benedeni had not been recorded yet in Southern Belgium
(Wallonia) (sampling devices & methods not targeted to semi-pelagic
species), see Josens et al, 2005;</DIV>
<DIV>8. Gammarus tigrinus is actually present in Belgium (River Meuse a.o.),
first record 1995 (Josens et al, 2005); no detrimental effect known;</DIV>
<DIV>9. Atyaephyra desmareti is indeed still present in Belgium (River
Meuse); no detrimental effect known</DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>I have no information about Quistadrilus nor Aedes
albopictus but will try to get it</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Please do not hesitate to ask for more information
on invasive freshwater macroinvertebrates in Belgium, specially in
Wallonia</FONT></DIV>
<DIV> </DIV>
<DIV>Best regards,</DIV>
<DIV> </DIV>
<DIV>Jean-Pierre Vanden Bossche</DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Dr Jean-Pierre VANDEN BOSSCHE<BR>Attaché
scientifique, Chef de projet.<BR>Centre de Recherche de la Nature, des Forêts et
du Bois (CRNFB)<BR>DGRNE, Ministère de la Région wallonne,<BR>Avenue Maréchal
Juin, 23. B-5030 Gembloux (Belgique)<BR>Tél.: + 32 (0) 81 62 64 39 Fax: +
32 (0) 81 61 57 27<BR>E-mail: </FONT><A
href="mailto:jp.vandenbossche@mrw.wallonie.be"><FONT face=Arial
size=2>jp.vandenbossche@mrw.wallonie.be</FONT></A><BR><FONT face=Arial
size=2>---------------------------------------------------------------------------------------<BR><EM>Le
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