PESQUISA / RESEARCH Dynamics of Snail Populations of Biomphalaria glabrata and B. straminea under Semi-Natural Conditions Dinâmica das Populações dos Caramujos Biomphalaria glabrata e B. straminea em Condições Semi-Naturais
نویسندگان
چکیده
BARBOSA, F. S.; SANCHES, O.; BARBOSA, C. S. & ARRUDA, F. Dynamics of Snail Populations of Biomphalaria glabrata and B. straminea under Semi-Natural Conditions. Cad. Saúde Públ., Rio de Janeiro, 8 (2): 157-167, abr/jun, 1992. Growth curves and mortality rates for populations of Biomphalaria glabrata and B. straminea bred under semi-natural conditions are reponed. Snail populations of the above species were maintained for 220 weeks in indoor cement channels. Data were recorded at 20 week intervals. Crude densities are significantly different for each of the studied populations. B. glabrata showed the lower figure while B. straminea R3 strain showed the best performance. The latter is able to live in half the volume of water needed for B. glabrata when both are submitted to population pressure.
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