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      Population dynamics of intermediate snail hosts of Fasciola hepatica and some environmental factors in San Juan y Martinez municipality, Cuba

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          Abstract

          The variation of abundances of intermediate snail hosts of Fasciola hepatica in Cuba (Fossaria cubensis and Pseudosuccinea columella) was studied during one year under natural conditions at five sampling sites in San Juan y Martinez municipality, Pinar del Rio province, Cuba. The effect of some environmental variables on the lymnaeid abundances was also studied. A canonical correspondence analysis showed that both species do not generally occur together in the same habitat and that most factors affect them in an opposite fashion, although both of them correlate positively through time to the diversity of the habitats. F. cubensis prefers the sites that are in or closer to the city whereas P. columella is more abundant in rural sites. Lymnaeid abundances are mainly affected by nitrite and nitrate concentrations as well as by the abundance of the thiarid Tarebia granifera. F. cubensis is more abundant in polluted habitats with low densities (or absence) of T. granifera whereas P. columella prefers cleaner habitats and can coexist with the thiarid, even at its higher densities. The implications of divergent preferences of the two lymnaeids for the control of fasciolosis are discussed.

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          Most cited references 23

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          The introduction of Melanoides tuberculata (Mollusca: Thiaridae) to the island of Saint Lucia (West Indies) and its role in the decline of Biomphalaria glabrata, the snail intermediate host of Schistosoma mansoni.

           J.P. Pointier (1993)
          A malacological survey was carried out in May 1992 in the whole hydrographic system of Saint Lucia 11 years after the end of a biological control programme to eliminate Biomphalaria glabrata, the snail intermediate host of Schistosoma mansoni. A competitor snail, Melanoides tuberculata, was introduced to Saint Lucia in 1978 and field experiments in several habitats were conducted by Prentice between 1978 and 1986. At the present time M. tuberculata is the most common freshwater snail in Saint Lucia. The results of the survey, undertaken in sites where B. glabrata occurred in large populations in the past showed (i) the absence of the snail hosts from seven sites now extensively colonized by the competitor (ii) the presence of B. glabrata in low or very low densities in 17 sites together with the competitor and (iii) the presence of the intermediate hosts in large populations in only two sites where M. tuberculata was absent. These results confirm the positive results observed by Prentice. The presence of another planorbid snail, B. straminea, is reported for the first time in Saint Lucia.
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            Ecologie des mollusques d'eau douce d'intérêt médical et vétérinaire à Cuba

             G Perera,  G PERERA (1996)
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              Biosystématique des Mollusques d'Eau Douce d'Intérêt Médical et Vétérinaire de Cuba

               MC Yong,  M Yong (1998)
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                mioc
                Memórias do Instituto Oswaldo Cruz
                Mem. Inst. Oswaldo Cruz
                Instituto Oswaldo Cruz, Ministério da Saúde (Rio de Janeiro )
                1678-8060
                May 2004
                : 99
                : 3
                : 257-262
                Affiliations
                [1 ] Centro Provincial de Higiene y Epidemiología Cuba
                [2 ] Instituto de Medicina Tropical Pedro Kourí Cuba
                Article
                S0074-02762004000300003
                10.1590/S0074-02762004000300003
                Product
                Product Information: website
                Categories
                PARASITOLOGY
                TROPICAL MEDICINE

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