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Evolutionary biology is the study of the history of life and the processes that led to its diversity Based on the principles of adaptation chance and history it seeks to explain all the characteristics of organisms Do specific choices made by female insects and spiders when selecting a mate influence the evolution of male insect and spider genitalia There is convincing empirical evidence for postmating sexual selection mechanism of genital evolution according to research comparing pairs of related clades of insects that differ in mating system This research also indicates that sexual selection could be responsible for the evolutionary elaboration of both primary and secondary sexual traits Arnqvist 1998 Which forms of sexual selection are responsible for genital evolution To answer this question we should look at the most common reasons for female insects and spiders to choose or reject a potential mate Size does not appear to be the deciding factor The factors seem to differ from species to species depending on their specific needs We will take a look at a few species of insects and spiders and attempt to discover what circumstances lead to successful matings between males and females We will also attempt to discover what criteria and traits if any the males must display in order to have a better chance of being selected as mates and which of these traits have evolved specifically as a result of sexual selection by females It is fairly certain that females make a conscious choice when choosing a mate Thus since female premating struggles in these insects water striders results in female choice our results provide the first direct empirical evidence of a substantial energetic cost of female choice Watson Arnqvist and Stallmann 1998 In their 1997 paper on insect genitalia William G Eberhard Bernhard A Huber Rafael Lucas Rodriguez S R Daniel Brinceno Isabel Salas and Viterbo Rodriguez compared allometric values of male genitalia size in twenty species of insects
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