Acessibilidade / Reportar erro

Determinação do crescimento populacional de Biomphalaria glabrata e Biomphalaria tenagophila (Mollusca, Planorbidae)

The populations size of Biomphalaria glabrata and of B. tenagophila were studied comparatively during a six months period. A significantly larger initial development was observed for B. glabrata. Upon reaching a criticai saturation levei the number of specimens in the populations decreased. Following a short period of oscillation, the frequency of individuais attained a certain stability. A decrease in the frequency of oviposition preceded a lowering of the number of specimens observed after the saturation levei. This study suggests that limitating factors in the population development would have acted as a feed-back mechanism.

Sociedade Brasileira de Medicina Tropical - SBMT Caixa Postal 118, 38001-970 Uberaba MG Brazil, Tel.: +55 34 3318-5255 / +55 34 3318-5636/ +55 34 3318-5287, - Uberaba - MG - Brazil