Freshwater mollusc (original) (raw)
Freshwater molluscs are those members of the Phylum Mollusca which live in freshwater habitats, both lotic (flowing water) such as rivers, streams, canals, springs, and cave streams (stygobite species) and lentic (still water) such as lakes, ponds (including temporary or vernal ponds), and ditches. This article is about freshwater Mollusca in general; for information on one particular family of freshwater molluscs, please follow the appropriate links in the lists below.
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| dbo:abstract | Freshwater molluscs are those members of the Phylum Mollusca which live in freshwater habitats, both lotic (flowing water) such as rivers, streams, canals, springs, and cave streams (stygobite species) and lentic (still water) such as lakes, ponds (including temporary or vernal ponds), and ditches. This article is about freshwater Mollusca in general; for information on one particular family of freshwater molluscs, please follow the appropriate links in the lists below. The two major classes of molluscs have representatives in freshwater: the gastropods (snails) and the bivalves (freshwater mussels and clams.) It appears that the other classes within the Phylum Mollusca -the cephalopods, scaphopods, polyplacophorans, etc. - never made the transition from a fully marine environment to a freshwater environment. A few species of freshwater molluscs are among the most notorious invasive species. In contrast, numerous others have become threatened or have become extinct in the face of anthropogenic change. (en) Au cours de l'évolution, une partie des mollusques ont quitté le milieu marin et se sont adaptés à l'eau douce ; ce sont les mollusques dulcicoles. On en trouve dans presque toutes les eaux douces, y compris dans des mares isolées et des lacs de haute montagne, et des milieux nouveaux créés par l'homme, ce qui montre, pour certaines espèces au moins, une bonne capacité de dispersion (via des organismes vecteurs animaux, ou via des bateaux dans le cas de la moule zébrée dont l'extension géographique récente a été large et rapide). Ils sont tous conchylifères (c'est-à-dire porteurs de coquille calcaire sécrétée par le manteau, et un pied locomoteur) ; dans ce sous-embranchement qui comprend 5 classes, seules deux sont présentes en eaux douces. On les classe généralement en deux catégories, selon la nature de leur coquille : les gastéropodes et les bivalves. Tout en jouant un rôle écologique essentiel (ayant aussi valeur de services écosystémiques), ils sont aussi connus comme hôtes intermédiaires de plusieurs microbes et parasites (nématodes, trématodes…) d'importance épidémiologique ou écoépidémiologique majeure (ex : Bilharzioses). (fr) |
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| rdfs:comment | Freshwater molluscs are those members of the Phylum Mollusca which live in freshwater habitats, both lotic (flowing water) such as rivers, streams, canals, springs, and cave streams (stygobite species) and lentic (still water) such as lakes, ponds (including temporary or vernal ponds), and ditches. This article is about freshwater Mollusca in general; for information on one particular family of freshwater molluscs, please follow the appropriate links in the lists below. (en) Au cours de l'évolution, une partie des mollusques ont quitté le milieu marin et se sont adaptés à l'eau douce ; ce sont les mollusques dulcicoles. On en trouve dans presque toutes les eaux douces, y compris dans des mares isolées et des lacs de haute montagne, et des milieux nouveaux créés par l'homme, ce qui montre, pour certaines espèces au moins, une bonne capacité de dispersion (via des organismes vecteurs animaux, ou via des bateaux dans le cas de la moule zébrée dont l'extension géographique récente a été large et rapide). (fr) |
| rdfs:label | Freshwater mollusc (en) Mollusque d'eau douce (fr) |
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