Efeito do fotoperíodo sobre o ciclo de vida e a morfometria da concha de Dysopeas muibum (Mollusca, Subulinidae) em condições de laboratório

Abstract

This study aimed to evaluate the effect of photoperiod on the life cycle and shell morphology of Dysopeas muibum Marcus & Marcus, 1968 under laboratory conditions. To this end, we conducted monitoring growth of the shell, the release of puppies and mortality of 40 specimens undergo natural conditions of temperature, relative humidity and photoperiod, and 80 undergo controlled conditions (40 with long days, and 40 with short days), from birth to 180 days, when the measures of the shell were taken. It was found that the photoperiod had no effect on the indeterminate growth, the relationship between reproduction and growth, iteroparidade and low mortality before and after sexual maturity. The controlled conditions of temperature, relative humidity and photoperiod favored growth, conchiliomorphometrics values higher and fast reach sexual maturity, while the decrease in day length favored fecundity.