New studies of social behaviour of giraffes have brought also new questions regarding the social relationships of this apparently well-known species.

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The aim of the thesis was to observe the mutual behavior between dogs in public spaces in Svitavy. A total of 250 pairs of dogs were monitored. I followed various aspects and their effects on the resulting behavior of the monitored dogs. I followed various factors, such as the age of the owner or the dog which first initiated sniffing. The results show that many factors have influenced social interactions, including the sex of the dog, the sex of the owner, or the way in which the dog is guided. I found that most of the other dogs started sniffing adult dogs and that the most sniffing place in all dog categories was the back. Most often, they urged dogs to play small breeds.

The aim of the diploma thesis was to study factors influencing behavior of dogs in public spaces in Brno. 133 pairs of dogs were observed. The dog's gender, dog age, and age of the dog owner affected the interaction. The owner of the dog affected by the interaction. The dog's sex, dog age, and dog age influenced sniffing. All factors that were monitored influenced the play. The gender of the dog affected the marking behavior. The gender of the dog owner affected the threat. The dog's owner's gender affected bite occurrence.

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Conclusions This thesis provides detailed insight into plant-animal relationships that are involved in reproduction of inselberg species. The results are interpreted in relation to the ecosystem functioning and they also contribute to the general knowledge on specialization in plant-animal interactions (Chapter 2 and 3), floral resources (Chapter 2, 3, and 5), pollinators' attraction (Chapter 2), relations between diaspore's characteristics and animal dispersal (Chapter 4), and conflicts among plant life stages that follow ovule fertilization (Chapter 4). As Clusia aff. sellowiana dominates the shrub vegetation, the study on its reproduction is the initial step to understanding the dynamics of the shrub patches and potential succession on the inselberg. The nocturnal pollination system of Clusia aff. sellowiana bears unusual characteristics and signs of specialization. Only one pollinator species, a cockroach Amazonina platystylata, was recorded and this species is apparently sensitive to olfactory attraction cues emitted by the flowers. This is the first evidence of pollination system that involves cockroaches as pollinators and is to some degree specialized. Clusia aff. sellowiana is dispersed by small birds. Because its diasporas are consumed by birds and there is a time lag before they are deposited,...