Fattori ambientali e comportamentali che influenzano il ciclo vitale in due specie polimorfiche di libellule, Ischnura elegans e Ceriagron tenellum

[Machine translation] The research project is part of studies on alternative reproduction strategies or mating strategies used by males or females that differ from the prevailing sex strategy. This study seeks to better understand the mechanisms that regulate the maintenance of female polymorphism in Odonates; in particular, two species, lschnuro elegons and Ceriogrion tenellum, have been studied. For both, natural populations were sampled to analyze the frequency of morphotypes and matings, the degree of parasitism and the size of individual individuals., The species lschnuro elegons has also been raised in the laboratory in order to highlight any differences in the growth and mortality of the offspring of the two maternal morphotypes at the larval stage., In addition, this research aims to verify the effects of two insecticides commonly used in rice farming environments, in order to contribute to a decrease in the use of these substances. The two substances were tested, at three concentration levels, on the larval stages of lschnura elegans in order to evaluate the effects on the growth and mortality of the larvae.