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Field investigations in 361 cattleor sheep-breeding farms on acid soil were carried out during thirty years in March-April to record indicator plants in relation to the category of habitat colonized by the snail Galba truncatula and to establish correlations with two parameters characterizing these sites (habitat area, snail density). Seven types of snail habitats and six species of indicator plants were listed in the 7,709 sites studied. The most frequent habitats were located at the peripheral extremities of open drainage furrows (84.1% of places colonized) and around spring heads (81.4%). Lower than 3-m sites were essentially found at the extremities of drainage furrows, along drainage ditches or around spring heads when Juncus acutiflorus, Juncus effusus, or Lotus uliginosus are indicator plants. In road ditches and along pond or river banks, greater values were found in most cases. The highest Annales Scientifiques du Limousin, 2009, 20, 1-12 2 snail densities (>25 snails/m) were observed in the case of J. acutiflorus (52.5% of habitats) and L. uliginosus (56.7%). Lower snail densities (<25 snails/m) were noted in the case of J. effusus (88.8% of habitats), while those found in the case of Glyceria fluitans, Agrostis stolonifera and Dactylis glomerata were often less than 10 snails/m. Juncus acutiflorus is a good indicator species for snail habitats present in meadows and in road ditches which border them. Even if it is less representative in the other types of snail habitats, its wide distribution in Europe allows to use it for searching most snail habitats on the whole acid soils of European countries.

annales scientifiques du limousin

Peut-on détecter les habitats d’un mollusque : Galba truncatula (Gastéropodes, Lymnaeidae) à l’aide de plantes indicatrices sur les sols acides du Limousin ?