Abstract
Some aspects on biology and ecology of the mayflies Callibaetis guttatus (Baetidae) and Caenis cuniana (Caenidae) were studied between 1986 and 1991 in Brejo-canal de Itaipuacu marsh, Marica, RJ, Brazil. Time of duration of the subimago stage in C . guttatus possibly indicares an aduptation for restricting it at night as an strategy to avoid desiccation. In the Summer, when the water level is low, population density decreased significantly, and a crescent process of dispersal to adjacent water bodies was observed. About C. cuniana , parthenogenetic reproduction seems to be an important strategy of adaptation to local conditions.
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