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Let's meet in the littoral: Diversity of symbiosis in the Verrucariaceae lichens
Schmidtová, Jana ; Škaloud, Pavel (advisor) ; Peksa, Ondřej (referee)
Lichens are organisms formed by several symbiotic partners, most importantly a fungus (mycobiont) and an alga or cyanobacteria (photobiont). Although most lichens are terrestrial, some can be found also in aquatic environments. Black crustose lichens from the family Verrucariaceae (Verrucariales, Eurotiomycetes, Ascomycota) were able to adapt to this environment very well and often dominate in the seashore near fluctuating water level. The ability of these lichens to inhabit various environments is associated with their unusually wide range of photobionts. However, this symbiont is not known to most of them. This work investigates the diversity of lichens of the family Verrucariaceae in the littoral zone of the Baltic and the North Sea coasts, the relationships between symbionts and the connection between lichen diversity and the salinity gradient. Using metabarcoding, the diversity of free-living algae in the vicinity of the studied lichens is determined and the symbiotic algae are compared with the photobionts found in the lichens. Mycobionts and photobionts were identified using ITS and 18S rDNA. A total of nine lineages of mycobionts and photobionts were found. The most common lichen turned out to be the species Hydropunctaria maura with its photobiont Pseudendoclonium submarinum. For several...
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Diversity of zooplankton of Tatras lakes in space and time
Čablová, Radka ; Černý, Martin (advisor) ; Šorf, Michal (referee)
This thesis is the first of its kind that evaluates the species composition, species richness and species abundance of zooplankton in littoral samples of 90 Tatras lakes (Western and High Tatras of Slovakia and Poland) collected in September 2004 in the context of environmental parameters of lakes and spatial relationships of individual lakes. The most frequently occurring species in the Tatras lakes in 2004 were also evaluated in terms of their occurrence in the lakes a century ago (Minkiewicz 1914, 1917 and Lityński 1913, 1917), during the period of acidification (Ertl & Vranovský 1964, Ertl et al. 1965, Hrbáček et al. 1974, Stuchlík et al. 1985) and during the period of recovery of the lakes from acidification (Hořická et al. 2006, Sacherová et al. 2006). Relationships between variables were analysed using Poisson regression, cluster analysis with multinomial regression, canonical correspondence analysis, Mantel tests and multiple negative binomial regression. Using analyses, lakes were divided into four clusters (A, B, C, D). Each cluster consisted of lakes with the same environmental and spatial factors and similar species composition. Thirteen zooplankton species (Acanthocyclops vernalis, Acroperus harpae, Alona affinis, Arctodiaptomus alpinus, Ceriodaphnia quadrangula, Cyclops abyssorum...
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The impact of zooplankton on carp production in Bohelov ponds
ŠINDLER, Martin
Zooplankton dynamics and the changing parameters of pond water in Bohelov ponds was monitored by regular sampling of zooplankton at approximately weekly intervals from April to October 2014 with sampling Schlott-Bauer method in a volume of 20 and 60 liters. The samples were divided into taxonomic groups and species, classified in so-called filterable zooplankton over 500 m. From the pond water parameters was monitored oxygen, pH, temperature, transparency and acid neutralizing capacity and their impact on production in ponds. Control fish out in each month showed a direct correlation with the increase in biomass Common carp (Cyprinus carpio) on the abundance of filterable zooplankton comparing the pond no. 1 and 3. Stocking was fed with feed wheat (Triticum) during the season. The abundance of zooplankton was different in different ponds and gradually changed by increasing fish stocking. A greater abundance of filterable zooplankton of Daphnia - Cladocera and lower species was noticed in the pond no. 1 as in the pond no. 3. With the increasing biomass of fish stocking has been demonstrated reduced of filtrable zooplankton where the number of small zooplankton (< 500 m) ind.l-1. Zooplankton was represented particularly by species Bosmina longirostris, Chydorus sphaericus, Daphnia galeata, D. parvula, D. ambigua. In order copepods - Copepoda were seen mainly nauplius and copepod stages of type Acanthocyclops americanus, rotifers were represented mainly by Brachionus sp. and Polyartha sp.. Increased abundance of filterable zooplankton has a impact on the final amount of biomass of fish stocking expressed by growth SGR (% .day-1) and a reduction coefficient relative FCR. Due to intensive farming combined with farming of poultry during the last decades has been observated accelerated eutrophication process of reducing the size of the littoral zone with a share of macrophytes.
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Factors affecting the occurrence of littoral vegetation in a reservoir with storage function
KROLOVÁ, Monika
This Ph.D. thesis focuses on the characteristic of littoral vegetation in reservoirs with a storage function and on the factors that may affect it. The current state of the littoral vegetation in different types of biotopes was detected by a detailed survey of the littoral in Lipno reservoir. Complexes of environmental factors characteristic for different types of biotopes were described. The dynamics of littoral vegetation in response to changes in water level fluctuations was monitored in a protected bay during three years. Based on the results, the vegetation zonation was described in the eulittoral zone of an aquatic ecosystem with irregular fluctuations in water levels. The thesis also deals with the use of a breakwater structure to protect littoral vegetation in erosion exposed biotopes. The results of all three studies are used as a basis for proposals for supporting the development of littoral vegetation in the eulittoral zone in reservoirs as defined in the Water Framework Directive.
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Interannual variability of littoral age 0+ fish in the canyon-shaped reservoir
VESELÝ, Lukáš
0+ fish communities of the littoral zone were sampled in the Římov Reservoir within the years 2007-2011. The goal of the thesis among other things was monitoring 0+ fish during five years in littoral habitats of Římov reservoir depending on year-class strength environmental factors, etc., and also find general distribution model, which can explain spatial distribution of juvenile fish in canyon-shaped reservoir. Results of this thesis could be used for another reservoirs which coincide with environmental condition of Římov reservoir.
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Diversity of fishpond zooplankton in Javořice highlands region
IŠTOK, Tomáš
It studied the species composition of pond zooplankton selected pond in Javořická highlands, near Nová Bystřice and Slavonice. Sampling was pelagial and at selected locations and littoral ponds. When selecting sites sampled, the emphasis was on the selection of sites with historical, expected or actual occurrence Heterocope saliens that occurs on sites with ponds and bogs around the aquatic environment with lower pH. These sites are usually extensively farmed. Found 69 species (24 Cladocera, 15 Copepoda, 30 Rotatoria). Confirmed the hypothesis that the greatest variety of species of zooplankton found at mesotrophic sites with moderate fisheries management.
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