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Influence of age and rearing conditions of a fish on the chance to survive in the wild
Lyach, Roman ; Frouzová, Jaroslava (advisor) ; Čech, Martin (referee)
The task of this thesis is to summarize all the most important biotic and abiotic factors that can influence chances of reared fish to survive in the wild. It contains some of the most frequently reared and popular fishes, such as Sander lucioperca (pike perch), Samo trutta (trout), Micropterus salmoides (largemouth bass), Esox lucius (northern pike), Esox masquinongy (muskellunge) and the hybrid of northern pike and muskellunge, the tiger muskellunge. Mainly the factors such as success, survival, rate of growth and mortality have been studied. Survival increases with the size of the fish because of the fact that larger fish can easily avoid predation. Pellet-reared fish show higher mortality than minnow-reared fish because of the loss due to predation and also slightly worse ability to catch living prey and obtain food, even though their diet contains similar species. Temperature can also affect the mortality of the stocked fish, mainly when the temperature difference between the rearing pond or hatchery and the new environment exceeds 10 řC, which brings loss of majority of the stocked fish. It has been revealed that genetics is very important during the process of stocking, while fish from the local population show better abilities to adapt to the environment than those from other geographic...
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The Evolution of Jordanian Political Regime After 1989
Ducháčková, Michaela ; Buben, Radek (advisor) ; Koubek, Jiří (referee)
The aim of this master thesis is to analyze political regime of the Hashemite Kingdom of Jordan and to find out some possible effects, which could have had an influence on its stability and survival in the last 25 years. The Jordanian political regime had gone through several crises in the examined years. Not only did it survive all of them but also became stronger. Which factors caused the survival of the regime? In the first part of the thesis we typologize the regime from three possible perspectives (institutional, formalistic and legitimation). The second part deals with an analysis of factors, which enable the survival of Jordanian political regime. The emphasis is given on the role of institutions.
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Surviving of Northern Lapwing (Vanellus vanellus) chicks in agriculture landscape
Kubelka, Vojtěch ; Šálek, Miroslav (advisor) ; Cepák, Jaroslav (referee)
The variability of egg-size within a bird species reflects different reproductive investments and, besides the intrinsic constraints and particular female quality, it can be affected by environmental factors, too. Moreover, the egg-size predetermines the chick performance. The knowledge of factors influencing precocial chick survival is crucial for better understanding of life-history strategies as well as for endangered species conservation. The Northern Lapwing (Vanellus vanellus) represents a suitable model species for investigation of climate variables effects on egg-size and also to study factors influencing chick survival. Eggs in a total of 714 nests were measured during 13 breeding seasons over period 1988-2014 in South Bohemia and 293 lapwing chicks from 100 broods in 37 localities were monitored in 2013-2014. The mean egg-size through the whole season is positively affected by March precipitation, March clutches also negatively by minus temperatures in March. The higher intensity of rainfall there is during March, the bigger eggs are laid in March and the steeper is slope of decline in mean egg-size during season. This decline is more profound with lower rainfall in April. The effect of habitat is not significant. The body mass and condition of hatchlings is positively correlated with the...
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Ornament expression and lifetime reproductive success in male barn swallows (Hirundo rustica)
Wnuková, Lucie ; Albrecht, Tomáš (advisor) ; Klvaňová, Alena (referee)
Within a lifetime of an individual, there are changes in the organism leading to an an impairment of phenotype, survival and reproduction. The expression of phenotypic traits often increases with age. Higher expression of these traits in the young age can lead to decreased probability of survival till the next season, influencing reproductive success of an individual. That is why organisms are challenged with trade-offs, when they have to allocate their limited resources either into the reproduction in form of expression of extravagant sex ornaments or into the life span. If the ornament evolved as a handicap, its exaggerated size could reduce viability of low quality individuals. Therefore, the ornament becomes a predictor of quality of its bearer and its size indicates the ability to survive till the next season. Both sexual ornamentation and inter-individual variation in life span may result in differences in reproductive success (fitness) and targeted by sexual or natural selection. Variability in reproductive success, mainly in monogamous species, can be increased also by sexual promiscuity and extra-pair mating and extra-pair copulations. This strategy can increase the opportunity for selection of traits that play role in choosing of extra-pair mate. In this work, I focused on two potential...
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Hypercapnia and diffusion of gases in avalanche (Changes in functional parameters of individuals in a crisis situation)
Mašek, Michal ; Bartůňková, Staša (advisor) ; Roubík, Karel (referee) ; Rotman, Ivan (referee)
Název: Hyperkapnie a difuse plynů ve sněhové lavině - (Změny funkčních parametrů jedinců v krizové situaci) Cíle práce: Cílem studie bylo kontinuální sledování kompenzačních mechanismů, zejména změn ventilačně-respiračních ukazatelů, v simulované sněhové lavině. Metoda: K získání dat byl použit experiment a nestandardizovaný dotazník. Výběr souboru byl vzhledem ke sledované problematice přísně selektivní. Výzkumu se účastnilo 22 probandů, ale po analýze dat bylo pro nesplnění požadovaných kritérií 11 osob vyřazeno. Soubor tedy tvořilo 11 zdravých mužů průměrného věku 25,3 let. Před vlastním experimentem byla pomocí osobního spirometru testována senzitivita na hyperkapnii a hypoxii (výdrž v apnoi) a dechová zdatnost (vitální kapacita plic s usilovným výdechem). Experimentální situaci představovalo jak dýchání do uzavřeného objemu (8 l), tak do vytvořené vzduchové kapsy ve sněhu (400 ml). Kontinuální záznamy oběhových funkcí (srdeční frekvence, krevní tlak) a ventilačně-respiračních parametrů (dechová frekvence, dechový objem, minutová ventilace, obsah O2 a CO2 ve vdechovaném a vydechovaném vzduchu, odpor při výdechu a saturace krve kyslíkem) byly snímány pacientským monitorem DATEX Ohmeda. Vzhledem k charakteru dat byla využita analýza rozptylu při opakovaném měření se dvěma faktory (dvoucestná...
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Possibilities of genetic testing in patients with pheochromocytoma and paraganglioma.
Turková, Hana ; Zelinka, Tomáš (advisor) ; Malík, Jan (referee) ; Fryšák, Zdeněk (referee)
1. Abstract Pheochromocytoma/ paraganglioma (FEO/PGL) may be developed on the basis of an inherited genetic mutation of different genes. They are associated with a high risk of developing of secondary hypertension, organ damage and metastatic disease that can be fatal. The aim was to focus on the possibility of genetic testing in patients with FEO/PGL, especially in patients with malignant tumors. The issue FEO/PGL, however, concerns not only the examination and assessment of risks arising therefrom, as well as other therapies and monitoring, including appropriate recommendations for clinical practice. We demonstrated a 20% incidence of cardiovascular (CV) complications before determining the final diagnosis of FEO/PGL, mainly arrhythmic, followed by complications of myocardial ischemia and accentuate atherosclerosis. Elevated levels of vitamin C and decreased levels of malondialdehyde (MDA) following the successful removal of the tumor demonstrated reduction of oxidative stress postoperatively. We found that early postoperative testing of levels of plasma metanephrines to confirm the success of surgical removal of FEO/PGL is already possible, since there was no significant correlation between plasma levels of metanephrines and postoperative examination interval. Distribution of frequency of metastatic...
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Biofilm formation in probiotic cultures and its application in pharmacy
Ryšávka, Petr ; Obruča, Stanislav (referee) ; Vorlová, Lenka (referee) ; Márová, Ivana (advisor)
The work was comprehensively focused on the development of adhesive forms of probiotics in the form of a biofilm on combined carriers with a prebiotic component. The second part dealed with the influence of food on the multiplication and survival of selected types of probiotic bacteria. Subsequently, the effect of individualized probiotic supplements on changes in the human intestinal microbiome was monitored. Suitable adherent probiotic strains for biofilm formation were selected and tested. Methods have been introduced and different variants of carriers for culturing and binding bacteria have been tested. In vitro experiments verified the stability of biofilm stucture and its resistance to low pH, bile and antibiotics in comparison with the planktonic cell form. The antimicrobial effect of probiotic strains in the form of a biofilm was studied. The cultivation of the multispecies biofilm on the combined carrier was optimized and the stability of the biofilm and the final viability of probiotic bacteria were confirmed. Furthermore, the influence of various foods and beverages on the viability of probiotic bacteria was evaluated with emphasis on the simulation of passage through the gastrointestinal tract. Both models, solutions with standardised concentrations of alcohol, sugar, salts, proteins or different pH and different types of real foods and beverages were tested. The effect of food and beverages was tested on monocultures of Lactobacillus acidophilus, Bifidobacterium breve and on probiotic capsules containing a mixed culture of probiotic microorganisms. The survival of probiotics in various food matrices in the simulated gastrointestinal tract was quantitatively different. We managed to define foods suitable for supporting the multiplication of probiotic bacteria. A separate part of the work was focused on the targeted modulation of the intestinal microbiome by individualized probiotics that were prepared on the basis of molecular biological analyzes of the intestinal microbiome aimed at detecting the percentage of lactobacilli, bifidobacteria and phylum Firmicutes and Bacteroidetes. Personalized probiotic supplementation confirmed the positive effect of this approach on microbiome changes, especially on the increase of the content of lactobacilli, bifidobacteria and the overall diversity of the microbiome.
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Not So Close That Breck
Smrekovský, Adam ; Jančík, Alexandr (referee) ; Šrámek, Jan (advisor)
How to stop working, and start catching dogs, and live alone on a hill and walk down only when you need to catch a dog. But it also stops entertaining you and you start thinking about village life. And so you run away from the end of the world to the village.
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Surviving Auschwitz with pre-existing social ties
Jurajda, Štěpán ; Jelínek, T.
Survivor testimonies link survival in deadly POW camps, Gulags, and Nazi concentration camps to the ability of prisoners to get help from friends present in the camp. We study the case of several hundred prisoners of a small, low-security Nazi agricultural labor camp located in todayís Czech Republic, who were ultimately on transports to Auschwitz, a deadly extermination and labor camp. We ask whether their chances of surviving the Holocaust depended on how many of their former co-laborers from the agricultural camp were present on their transports to Auschwitz, which included another 9 thousand Czech male prisoners. We uncover a large, 10 percentage point survival advantage to having arrived in Auschwitz with at least 50 former co-laborers from the agricultural labor camp. This evidence is similar to that provided by Costa and Kahn (2007) for a US Civil War POW camp, and consistent with the fundamentally selective accounts provided by survivors.
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