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Male cognition has gained recognition as an important potential player in sexual selection. Sex roles can differ dramatically, and sex differences in selection on cognition likely follow from the different tasks associated with these sex roles. Here, using threespine stickleback Gasterosteus aculeatus , a species with clearly divergent sex roles and mutual mate choice, we focus on the cognitive trait inhibitory control because males must differentially respond to reproductive females versus other sticklebacks while defending territories and refrain from eating eggs and fry while performing paternal care. We presented fish with a detour task four times over a period of 7 days, allowing us to assess initial inhibitory control and improvement over time.
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The Czech Statistical Office CSU will start keeping a continuous record of the start and end of same-sex partnerships in the country, similar to how they record marriages and divorces, CSU spokesman Jan Cieslar told journalists Tuesday. The government will also keep track of children born in same-sex partnerships, Cieslar said. The CSU is preparing the record-keeping in connection with the population census in In early June, the Chamber of Deputies passed the law on census. The data on the conclusion and dissolution of registered partnerships by a decision or death of the partner are kept in the information system of the population register and in the information system of the foreigners, CSU director Marek Rojicek said.
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Our understanding of sexual selection has greatly improved during the last decades. The focus is no longer solely on males, but also on how female competition and male mate choice shape ornamentation and other sexually selected traits in females. At the same time, the focus has shifted from documenting sexual selection to exploring variation and spatiotemporal dynamics of sexual selection, and their evolutionary consequences.
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