of the Ph.D. thesis Autor: Jan Matějů Name: Sociality and ecology in ground squirrels (tribe Marmotini) Ground-dwelling squirrels are parafyletic group of rodents from the family Sciuridae (tribes Marmotini and Xerini). Ground-dwelling squirrels are semi-fossorial inhabitants of treeless biotopes. They share most aspects of general biology. They usually breed once a year, have exclusively diurnal activity and are omnivorous. On the contrary, ground-dwelling squirrels display different levels of sociality, which makes them an ideal model to study different ecological aspects connected with evolution of sociality. The first part of the Ph.D. thesis is focused on the relationship between sociality and sexual size dimorphism and relative and absolute size of brain. At first, supposing that different levels of sociality are connected with differences in intensity of sexual selection acting on males, we tested association between sociality and sexual size dimorphism as well as association between sexual size dimorphism and body size - so called Rensch rule. Next, we tested correlation between sociality and relative brain size. In agreement with the Social brain hypothesis, we assumed that e.g. solitarily living species should have smaller relative brain size than species living in stable pairs. We found...

Small carpenter bees (genus Ceratina) are an excellent model taxon for the study of evolution of parental care and origin of eusociality. Prolonged offspring care is typical for this bee genus. Females usually guard their offspring until adulthood and later feed their adult offspring pollen and nectar. Moreover, most of studied species are facultatively eusocial, a trait probably inherited from the common ancestor of the genus. Although Ceratina bees have generally very interesting behavior, detailed studies were performed in only a few species, usually from North America, Japan and Australia. Only anecdotal observations of natural history existed for a few European species, and detailed research has not been performed before my thesis. The goal of my thesis is to explore the natural history of European species of Ceratina and to identify possible costs and benefits of this species' behavioral traits. I focused on following these behavioral traits: social nesting, guarding of offspring until adulthood, and feeding of mature offspring. Through my master project, I discovered biparental care in species C. nigrolabiata, therefore the most important goal of my Ph.D. project is the evaluation of costs and benefits of this behavior. Guarding of offspring by mother significantly influences their survival,...

This diploma thesis traces the changing human, animal and technology assemblage after the recent emergence of wolf packs in Broumov region. As the return of wolves coincides with ecological transformations gaining in strength, the central research focus are the possibilities - and impossibilities - of local multispecies coexistence in the conditions of Anthropocene. The research draws upon methods of multispecies ethnography, building on the literature that examines the ontological aspects of multispecies coexistence, including primarily the work of Donna Haraway, Eduardo Kohn, Annemarie Mol, Anna Tsing and Rane Willerslev. The thesis analyzes several modes of situated multispecies coexistence which have been reconfigured or made possible by the return of wolves: administrative and sensual practice of shepherds, methods of mimetic empathy of wolf trackers, emergence of new actors interfering with local events (satellites, subsidy programmes, drought) and the translation of processes on pastures into politically engaged activities of local farmers. The thesis develops the employed concepts in such a way that they enable analyzing the situation in Broumov region as situated making of more-than-human sociality. Key words: multispecies ethnography, wolfs, pastoralism, trackers, more-than-human sociality