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	Sperm size variation in mice of the tenus Mus Daniszová, Kristina ; Stopka, Pavel (advisor) ; Sedláček, František (referee) Detailed record
	Sperm size variation in mice of the tenus Mus Daniszová, Kristina ; Stopka, Pavel (advisor) ; Sedláček, František (referee) Detailed record
	Levels of physiologically active substances during the ontogeny of social hierarchy in two house mouse subspecies Bufková Daniszová, Kristina ; Stopka, Pavel (advisor) ; Dušek, Adam (referee) ; Sedláček, František (referee) 2 Abstract Social interactions of animals are represented by a complex network of relations among individuals affected by many factors. From a practical point of view, it is very complicated or even impossible to observe these interactions under natural conditions and consider all fundamental underlying factors. A suitable solution may be, for example, to use a social environment of so called fraternal pairs. With a simplified model represented by pairs of brothers it is possible - given a properly set length of the experiment and age of the individuals involved in it - to reveal various aspects of establishing social hierarchies. A key factor influencing an individual's position (especially of a male) in the group is considered to be his physical fitness which is usually connected with his size and hence with his body mass. In addition to physical qualities of individuals, a fundamental role for achieving the "social" success is also played by the ability to communicate these qualities (e.g. through chemical signals) to other members of the social group. Apart from somatic and communication characteristics determining chances of an individual to succeed in the social competition, the internal regulation of these aspects presents another interesting subject for studies. In this respect a special attention... Detailed record

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