title: [Remarks on the ecological adaptation of the snail aquatic fauna in saline medium of the Dallol ponds. (Republique du Niger) (author's transl)].
abstract: Human vesical and intestinal bilharziasis, bovine fasciolosis and paramphistomosis, equine gastrodiscosis and ovine carmyeriosis, are frequent in the Dallols'region, (12 degrees - 13 degrees 30 N. lat. ; 3 degrees E. long.), Republique du Niger, Africa. Dallols are fossil valleys pouring water from late Saharian lakes. They are also tributaries of the Niger River. During the dry season, they become dry and many residual ponds of varied dimensions; from tens feet to one or two miles long, are lying along the valley bottom. The water is sometimes fresh but more frequently salt, (sodium, calcium and potassium, chlorides, sulfates, carbonates and bicarbonate), are in solution of variable proportions. From november to april, the total salt concentration is increasing by high evaporation and the medium becomes non likely to live for aquatic vector snails, Bulinus truncatus, Biomphalaria pfeifferi, Bulinus forskalii, Lymnaea natalensis and Afrogyrus coretus.
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D001700:Biomphalaria / Q000502:physiology; D002033:Bulinus / Q000502:physiology; D005618:Fresh Water; D009548:Niger; D012492:Salts; D012908:Snails / Q000502:physiology*
chemical_list: D012492:Salts
vernacular_title: Sur quelques particularités ecologiques de la faune malacologique vectrice de trématodes dans les Dallols nigériens