vi Abstract Continental subspecies of the great cormorant (Phalacrocorax carbo sinensis) is the Czech Republic's most important fish-eating predator. It causes damage to production fish, as well as sport fishermen and even after its removal from the Czech list of endangered species in 2013, it did not disappear from the spotlight of both local fishermen and researchers. This thesis evaluates the qualitative and quantitative composition of the cormorant's diet during winter 2011/2012 at two selected locations: the Žehuň pond (Kolín district) and Berounka river in the natural reserve Zábělá near Pilsen. This work studies the main components of cormorant's diet in the selected locations and evaluates potential fluctuations and changes in its composition during winter. The study also conducted the analysis of the proportion of commercially harvested valuable fish in cormorant's diet and studied its diversity of the species spectrum. The resulting data for the two sites were compared with each other and with relevant literature. Regurgitated pellets analysis, as well as analysis of diagnostic bones and fish remains located at the sleeping roosts (night roosts) were used for the diet analysis. It was found that at both sites roach was the most caught fish, but from the point of view of total biomass, it was...

This thesis deals with the organic livestock production in South Bohemian region. The aim of the thesis was to analyze the South Bohemian organic meat production, production of eggs and honey and distribution of the biocommodities. Through the processing of data from the database IAEI and questionnaire survey, conducted at the level of organic farmers farming in the South Bohemian region with a valid certificate for meat production, development and the current market situation of organic meat production were assessed in the South Bohemian region.

Piscivorous birds are often blamed for causing significant damage to fish stocks. Various methods are used to determine the composition of their food, each of them has limits in its ability to determine the complete food spectrum. This work maps the complete food composition of 14 species of fish-eating birds with a method that is not commonly used. Method used in this work uses analysis of publicly available photos on Google.com. In addition to the complete composition of the food, the species composition of the non-fish part of the prey was also determined, and in the case of the Great Cormorant (Phalacrocorax carbo), also the length of the fishes it catches. The aim of this work is to reveal the usability of this method for these purposes. A total of 2350 retrieved photographs were analyzed. The results obtained by photo analysis are in all cases compared with data in the available literature. For representatives of heron birds (Ardeidae), the analysis of photographs provided good information on the food spectrum of individual birds and on the qualitative composition of the non-fish component. It also provided relatively good information on the diet of the White-tailed Eagle (Haliaeetus albicilla), but the bird part of the prey was slightly underestimated. In the diet of the Great Crested Grebe...

Energy security is an important phenomenon of the contemporary world. A significant number of oil and gas reserves are located on the seabed. Expansion of oil and gas drilling to deeper and from shore more remote locations can again raise the question of ownership of these deposits. On one hand, there are regions of the world where these disputes over borders of maritime territories escalate into a series of clashes and incidents. On the other hand, there are other areas where states can settle their disputes and cooperate on drilling. The goal of this study is to determine which factors lead to the fact that particularly in the South China Sea disagreement about the boundaries of maritime territories results in the escalation of disputes in comparison with the regions of the North Sea and the Caribbean Sea, where disputes are solved or minimized. These factors are represented by six variables, which are based on three theories: a realist, idealist and constructivist theory of international relations. The first part of this study describes the historical development of current international maritime law with regard to the territorial division of the world's oceans. It is followed by a description of three case areas. The second part deals with the theoretical foundations of the examined factors. In...