SOIL MOISTURE AND SEASONAL EFFECTS ON THE MORPHOMETRY OF THE OVIDUCT, PENIS AND RETRACTOR MUSCLE OF THE GIANT AFRICAN LAND SNAILS, ARCHACHATINA MARGINATA AND ACHATINA ACHATINA

Abstract

This study evaluated the effect of soil moisture and season on the morphometry of part of the reproductive tract of the Giant African Land snails, in a 2 x 2 x 4 factorial experiment with two species (Archachatina marginata and achatina achatina), soil moisture at two levels (low – 25ml of water/ week and high – 100ml water/week) and season at four levels (cold dry, hot dry, hot wet and cold wet) constituting the three factors. Result showed that season had a highly significant effect (P<0.001) on the dimension of oviduct, penis and the retractor muscle of A. achatina and A. marginata. Significant species effect (P<0.001) was observed in the dimension of oviduct, penis and the retractor muscle of A. achatina and A. marginata. Soil moisture level significantly affected the oviduct weight, penis length and retractor muscle (P<0.01) as well as the retractor muscle weight of A. achatina and A. marginata.  There was significant interactions between season and species for oviduct dimension (P<0.001), penis length and retractor muscle weight (P<0.001), penis weight and retractor muscle width (P<0.01), penis width and retractor muscle length (P<0.05).  There was interaction between season and soil moisture for oviduct length, penis length and retractor muscle weight (P<0.01); the weight of the oviduct and retractor muscle.  The interactive effect of species and soil moisture significantly affect the penis length and weight (P<0.05) and the width of penis and retractor muscle, while no interactive effect of species and soil moisture (P>0.05) was observed on the oviduct dimensions. There was no significant interaction (P>0.05) between season, species and soil moisture. However, the effect of snail liveweight was highly significant (P<0.001) on the oviduct, penis and retractor muscle dimension.     It is concluded that snails reared on high soil moisture condition had higher dimensional values for oviduct, penis and retractor muscle while the seasonal variation also affected the dimension of the organs measured in this study.Â