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Acceptance of Fish Predators by Students of Chosen High Schools
Sůva, David ; Andreska, Jan (advisor) ; Hanel, Lubomír (referee)
The thesis describes the attitude students of professionally oriented high schools have toward chosen species of fish-hunting predators, namely the eurasian otter, the american mink, the great cormorant and the sea eagle. The first part of the thesis focuses on both historical and present recognition of these species in our country, description of each species including their population and protection measures. The second part of the text analyzes the curriculum framework of chosen high schools. The third part is a field study. The field study found which textbooks are used by students to learn about the fish-hunting predators listed above as well as the student's perception of them. A sample of 191 students were questioned, out of which 98 are students of schools of forestry and 93 are students of schools of fisheries. The worst acceptance was found with the great cormorant. The best acceptance was of the sea eagle. Key words: predation, eurasian otter, american mink, great cormorant, sea eagle
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The Impacts of Non-native Species American Mink (Neovison vison) on Native Fauna
Moucha, Pavel ; Vrabec, Vladimír (advisor) ; Jan, Jan (referee)
The American mink is among the weaselly (Mustelidae) carnivore native to North America. It is a food opportunist living semiaquatic lifestyle. He is very well adapted to the new environment. And he was introduced by humans as a furry animal to many areas of Europe, Asia, South America and other areas. Secondarily often he escaped or were released into the wild, where he managed very well prosper and continue to reproduce. To the Czech Republic came as a furry animal in 20. to 30. years of the last century, in the wild he was then observed since the 60s.
This study examines the impact of American mink on our fauna, especially in view of the food spectrum. The research was conducted in the middle of the river Berounka in Křivoklát from December 2014 to December 2015. The aim of the study was to capture the largest possible number of minks during the summer and in winter. Another aim was whether mink dangerous for the local population of reptiles.
Trapping took place during the 552 trapping night. a total of 20 were trapped mink. This means that the average captured 1 mink to 28 trapping night. Of these 20 individuals were 5 females and 15 males. It caught up to 8 mink in the winter and 12 in the summer. Based on the analyzes were 7 mink (35 %) excluded from the analysis because of an empty stomach. The largest component of food mink accounted for 76.16 % mammals for example order: Rodentia eg. vole (Microtus arvalis), muskrat (Ondatra zibethicus). Other food components formed on the same level with a share of 7.69 % reptile grass snake (Natrix Natrix), birds (order: Passeriformes) and fish (class: Actinopterygii). The last component of food occurring in the samples was 0.77 % of the insects (orders: Coleoptera, Lepidoptera). In the analysis wasn´t detected representative of the class of amphibians (Amphibia). The food spectrum in the winter and summer season was no different. At-risk populations reptile shows finding snakes in the stomach mink. An important outcome of this study is also alert to legislative issues concerning the mink in the Czech Republic and the possible effects on the otter (Lutra Lutra).
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Zdravotní problematika v chovech kožešinových zvířat v ČR
Trávníčková, Ivona
The main objective of this bachelor thesis entitled The health issues in breeds of fur animals in the Czech Republic is the mapping of important diseases occurring in the breeds of carnivorous and herbivorous fur animals reared on the fur farms. The first part is devoted to assessing the current status of fur animals bred on the fur farms. The main chapter on illnesses of these animals is divided into different sections according to the kind of agent and method of infection and a description of these illnesses. The next sec-tion describes the specifics health issues of fur animals with regard to the kind of food intake, particularly for carnivorous and herbivorous, and a brief description. Conclusion of the work is devoted to describing and evaluation of the current health situation in a particular foxes, minks and chinchilla fur farm.
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Prevalence and diversity of Cryptosporidium infecting fur animals
KELLNEROVÁ, Klára
The object of this thesis was evaluation of occurrence and prevalence of Cryptosporidium infection in fur animals, mainly American mink, fox and chinchilla. A total 370 individual specimens originated from mink (n = 340), fox (n = 18) and chinchilla (n = 12) were collected. While microscopy examination did not proved any presence of Cryptosporidium oocyst in fecal samples, molecular tolls based on amplification of small ribosomal subunit and 60 kDa glycoprotein of Cryptosporidium revealed three positive samples in minks. Following phylogeny analyses of both loci showed presence of C. ubiquitum of the XIIa1 family subtype in all positive samples. The XIIa1 family subtype was detected in Carnivores for the first time. No correlation between Cryptosporidium infection and presence of diarrhea was observed in this thesis.
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Invasive species of fur animals in the coutryside of the Czech Republic
KOPŘIVA, Jan
Subject of the Bachelor´s thesis was developing of a literature review focusing on the status of invasive species of fur animals in the Czech Republic. Further attention was drawn to the damage , including diseases that may cause these animals and spread. It is discussed about the muskrat , the coypu, the raccoon , the raccoon dog and the mink , as they are species of fur animals, which are found freely on the territory of the Czech Republic , and there are not original animal species.
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Comparison of efficiency of box traps and floating rafts as monitors and trap sites for mink (Musela vison) and polecat (Putorius putorius) for population control.
BARTÁKOVÁ, Daniela
The aim of my thesis was to evaluate two methods of monitoring of the American mink and polecat, monitoring with live traps and by floating rafts. While the first method is commonly used in our country, where the second method is the pilot project here, but it has been used in the UK successfully. Observation was from August to November in 2008 and from April to November in 2009. Observation took place in the area near PP Černíč near Dačice, where were chosen 4 different habitats. All detected tracks of Mustelids found on rafts were from the American mink. It corresponds with captures, where were captured also only minks and no polecat. Occupation of rafts was higher in 2008 than in 2009 because of the eradication of mink in November 2008. In both years the highest occupancy rate in rafts was in September and the lowest in October. There were differences between habitats and number of captured minks and tracks. In compare between rafts and traps, rafts were more successful method.
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Impact of american mink on stone crayfish populations
PAVLUVČÍK, Petr
1. Impact of introduced American mink (Mustela vison) predation on endangered stone crayfish (Austropotamobius torrentium) was examined in western Bohemian middle-sized streams for two years. Mink diet selectivity and its impact on its prey abundance were been investigating as the main target of this study. 2. The mink diet was described from excrements which were found on the target areas. The importance of different types of prey was specified by their relative numeric contribution to diet. The number of hunted crayfish was elicited from the number of crayfish remains which were collected during two years. The crayfish abundance was determined by capture {--} recapture method. 3. The crayfish was most frequently observed component of mink diet. The rate of mink predation on crayfish was dependent on density of crayfish population. This observed rate was lower during winters than during summers. The mink preferred significantly longer crayfish than was the mean of this value in population. 4. Although the crayfish was important part of mink diet the trend of impact of mink on crayfish is still inexplicit. It would be important to continue in this research to determine correlation between these two species.
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