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National Repository of Grey Literature

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The Influence of Parasites on the Sex Ratio Benešová, Jana ; Kaňková, Šárka (advisor) ; Votýpka, Jan (referee) Changes of the sex ratio in favour of one sex or the other may be caused by various factors. These changes have proximate causes, while some may even have ultimate causes. One of the factors affecting the sex ratio is parasitisation. The parasite manipulates the sex of the offspring of their hosts intentionally, or as a so-called side effect of its actions. The major role in deviated formation of the sex ratio is often endocrine and immune systems. Many studies are also concur with the Trivers-Willard hypothesis on a lower sexual index in the poor condition of females. Key words: sex ratio, parasite, Trivers-Willard hypothesis, manipulation hypothesis, sex hormones, immunity Detailed record

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