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<DIV><FONT face=Arial size=2>Dear Colleagues,</FONT></DIV>
<DIV><FONT face=Arial size=2>
<DIV> </DIV></FONT></DIV>
<DIV><FONT face=Arial size=2>In addition to the former messages and to be more
precise about some recent exotic/invasive freshwater species in
Belgium:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>1. The "exotic" species Corbicula both spp.,
Atyaephyra desmarestii, Hemimysis anomala occurs in the river Meuse in Wallonia.
Among these, Corbicula spp are "invasive" and "detrimental" (as well as
Dreissena, Dikerogammarus spp, Hypania, for instance)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>2. Gammarus tigrinus is "exotic" but does not seem
to be "invasive"(at the present time). As well as Crangonyx pseudogracilis, it
may vanish under the pressure of Dikerogammarus spp. First record in Belgium
(Wallonia) at Petit-Lanaye in 1995 (Josens et al, 2005) on 9th Septembre 1995.
Restricted, in Wallonia, to the Meuse river.</FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>3. I sampled personally Corbicula fluminea AND
Corbicula fluminalis in the river Meuse, at Petit-Lanaye (Belgium, Wallonia), on
9th Septembre 1995, 1 pm.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>4. The actual status of Atyaephyra, Hemimysis and
Limnomysis is not easy to settle as these species are not easily caught
with our current sampling devices and methods ("good luck" catches). Therefore,
we should not conclude too rapidly to these species' statuts. </FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>In my opinion, we should be comprehensive and
include in the list all "exotic" (or "alien", "allochtonous",...) species,
invasive as well as not (yet?) invasive, detrimental as well as not (yet?)
detrimental. The settlement status can be indicated in the columns, as it
is now .</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Yours for more information.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Best wishes,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Jean-Pierre</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </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
CRNFB est certifié ISO 9001:2000. "Ce message n'engage aucunement la DGRNE et
reste informel. Tout courrier officiel doit toujours actuellement être confirmé
par lettre et revêtu de la signature d'un agent dûment
mandaté."<BR></EM></FONT></DIV></BODY></HTML>