Climat – Environnement

Alerte au ver tueur dans la Drôme

Par Germain Treille, France Bleu Drôme-Ardèche lundi 14 avril 2014 à 6:01

photo d'un plathelminthe terrestre
photo d'un plathelminthe terrestre © Radio France

Le plathelminthe, ça ne vous dit sans doute rien. Et pourtant, il est là, sous vos pieds ou bien caché dans un pot de fleur. Il s'agit d'un petit ver plat qui arrive de l'Hémisphère Sud. Un tueur de lombrics et une menace pour l'équilibre du milieu naturel. Pour la première fois, il a été observé dans le département de la Drôme.

Le plathelminthe, tueur de lombrics, repéré dans la Drôme

La guerre est déclarée. Un professeur parisien de zoologie a endossé l'uniforme de soldat. Jean-Lou Justine entend éradiquer la menace.Car la petite bête, qui ressemble à une sangsue, qui mesure 3 à 5 cm, originaire de l'Hémisphère Sud, est un redoutable prédateur qui attaque, tue et dévore les lombrics.Alors, vous vous dites, une bestiole comme ça, ça peut modifier le milieu naturel ? La réponse est malheureusement affirmative.** Vers un déséquilibre du milieu naturel ?**

En détruisant les lombrics, le plathelminthe fait peser une menace sérieuse sur l'équilibre du milieu naturel. Car notre ver à nous, inoffensif, est un élèment essentiel pour l'aération des sols, la circulation de l'eau et le mouvement des matières nutritives dans la terre, un plus donc pour les végétaux.A tout cela s'ajoute le fait que le lombric est aussi une ressource alimentaire pour des animaux et des oiseaux. Jean-Lou Justine a déjà reçu de nombreux témoignages et photos. Une enquête scientifique participative. La première observation dans la Drôme est récente, on la doit à un habitant de la région de Valence qui, en manipulant des pots de fleurs, est tombé par hasard sur le ver tueur. Et si un département est touché, le voisin l'est aussi probablement. L'Ardèche n'échappera donc pas au plathelminthe.

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Jean-Lou Justine compte sur d'autres témoignages et sur d'autres photos pour compléter la carte de l'implantation du plathelminthe dans notre pays. Alors, n'hésitez pas à contacter le chercheur via son blog si, vous aussi, vous remarquez un de ces vers dans votre jardin et si vous souhaitez participer à cette enquête scientifique : http://bit.ly/Plathelminthe.