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Alda, 2011 4 allocation of energy to reproduction induced by predators or parasitic castratos, anthropogenic stressors, or perhaps a combination of these factors. Parasitism by Microphallus simillimus, the most common parasite in the estuary, causes variations in the shell dimensions of H. australis, the shells of infected snails being narrower than those of uninfected snails. Microphallus simillimus not only castrate the females of H. australis but it may induce the allocation of energy to reproduction rather than growth. I reported temporal and spatial heterogeneity in larval digeneans communities of H. australis in Bahía Blanca estuary. Two annual peaks of prevalence were observed, the first in late summer and the second in late winter and early spring. Host life cycle and environmental conditions might explain this seasonal pattern in larval digeneans communities. Specific composition of larval digenenans communities would be related with the occurrence of definitive hosts.

Estadios larvales de digeneos parásitos de Heleobia australis (d'Orbigny 1835) en el estuario de Bahía Blanca