EXPERIMENTAL STUDY OF THE HORMONAL CONTROL OF EGG DEPOSITION IN TRITURUS VULGARIS

Abstract. We studied the impact of additional hormones on egg deposition parameters by injecting human-chorionic gonadotropin (HCG) to Triturus vulgaris females at different moments of the deposition period. The females had a higher susceptibility towards HCG in the early period of the egg deposition. The parameters describing egg deposition differed between newts originating from highly unpredictable environments (flooded areas, temporary ponds) and more stable environments (permanent ponds). In temporary ponds with a high risk of desiccation the end of oviposition is probably triggered by a decrease in hormones induced by environmental factors. Key words: egg deposition, hormonal stimulation, newt, Triturus vulgaris, reproductio