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Adaptability of temperate forest soils to fire
Švábová, Bára ; Jílková, Veronika (advisor) ; Devetter, Miloslav (referee)
This research paper examines the adaptability of temperate forest soils to wildfire, as the frequency and intensity of wildfire in temperate forests is expected to increase with climate change. In addition, climate change is expected to shift the forest boundary northwards, so temperate forests are likely to be gradually replaced by Mediterranean forests, where fire frequency is currently high. How much a fire disturbs soil properties depends on the intensity, severity, frequency and climatic conditions following the fire. Fire in temperate forests primarily negatively affects the organic matter content, which further influences physico-chemical and biological properties. Thus, the most important factor in restoring the soil properties of temperate forests is the restoration of organic matter, which is linked to revegetation. After comparison with studies from boreal and Mediterranean forests, it was found that the recovery time of temperate forest soils is similar to that of boreal forest soils. Soil properties such as increased pyrogenic carbon content, rapid recovery or increased numbers of fungi and bacteria and increased aggregate stability may help in soil recovery after fire. This work is important in the context of climate change and could help in developing strategies that promote soil...
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Zooplankton community development in newly created small pools
Vondrák, Daniel ; Černý, Martin (advisor) ; Devetter, Miloslav (referee)
The relative importance of local and regional factors to community build-up is a core issue in contemporary ecology. Studies based on research of newly created aquatic habitats may improve understanding of these processes. We monitored zooplankton colonization rates and community assemblage in 20 newly dug and isolated temporary pools in Kokořínsko Protected Landscape Area. The region is characterised by deep stream valleys, extensive land use, low human influence, low waterfowl migration activity and practically absence of large water bodies. After the first hyproperiod all temporary pools were rebuilt to a permanent form. In contrast to expectations, in both cases we observed immediate colonization of newly created habitats by two main groups of zooplankton (crustaceans and rotifers), but only rotifers (Rotifera) were capable of fast successful establishment of viable populations. Cladocerans (Crustacea: Cladocera) and copepods (Crustacea: Copepoda) were observed rarely and usually in low abundances (< 1 ind-l ). 10 months after the filling of permanent pools one ostracod species (Crustacea: Ostracoda), Notodromas monacha, was recorded as well. During the 8 months of temporary pools existence the presence of 1 cladoceran and 1 cyclopoid copepod species and 12 rotifer taxa was recorded, icluding...
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Koncepce a metodologie komplexního studia dlouhodobých trendů vývoje krajiny v užším a širším zázemí JE Temelín: Chemický a biologický monitoring vlivu odpadních a dešťových vod JE Temelín
Výzkumný ústav vodohospodářský T.G. Masaryka, Brno ; Schambergerová, Jana ; Hejzlar, Josef ; Devetter, Miloslav ; Himmel, Jan ; Žáková, Zdeňka ; Pavonič, Michal ; Kočková, Eva ; Mlejnková, Hana
Zpráva obsahuje přehled šetření prováděných v roce 2005, výsledky šetření a jejich vyhodnocení: 1. Sledování na soustavě Býšov v povodí Strouhy, 2. Sledování zonace kyslíku a teploty na vybraných profilech Vltavy, 3. Sledování sezónního výskytu planktonních sinic na nádržích Hněvkovice, Kořensko, Orlík a na vybraných modelových rybničních nádržích v blízkosti Jaderné elektrárny Temelín, 4. Monitoring změn ve vodních ekosystémech se zvláštním zřetelem na sledování změn ve složení zooplanktonu.
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Seasonal development and vertical distribution of soil rotifer populations in South-Bohemian beech forest
Devetter, Miloslav
The soil rotifer community in a climax beech forest in South Bohemia was investigated during 2005 focusing on seasonal and vertical distribution changes. Samples 10 cm.sup.2./sup. large and 10 cm in depth were divided into 5 layers, which were processed separately. Altogether 31 rotifer species were determined during the investigation, of these 9 species were monogononts, while the rest were bdelloids. The most important species were .i.Encentrum arvicola, Wierzejskiella vagneri./i. among the monogononts and .i.Adineta steineri, Ceratotrocha cornigera, Habrotrocha filum, H. ligula, Macrotrachela plicata, Mniobia tentans, M. incrassata, M. granulosa./i. among the bdelloids. Mean Shannon diversity index varied from 1.99 to 2.63. Total rotifer abundance varied from 212 (± 63) to 513 (± 127) 10.sup.3./sup. ind. m.sup.-2./sup. year-round, with the highest numbers found in May, while the lowest were in July.
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Primární sukcese společenstev půdních vířníků na výsypkách po těžbě hnědého uhlí
Devetter, Miloslav
The changes of rotifer soil communities along primary succession chronosequence was studied on brown coal post mining areas near Sokolov, NW part of the Czech Republic. The age of successional stages was 2, 11, 14, 20, 43 years. The rotifers were extracted from soil samples using modified method of Baermann funnel with combined light and temperature gradients. In total, 17 taxa of soil rotifers were identified throughout the study. Most common species were .i.Adineta vaga, Habrotrocha rosa, Macrotrachela quadricornifera./i.. The important were also .i.Encentrum arvicola, Habrotrocha elegans, Macrotrachela nana./i.. Total densities varied from tens to hundreds thousands individuals per m.sup.2./sup. and increased with the increasing age of the plot. Depressions of the surface relief hosted higher numbers of rotifers than elevations, but elevations were more rich in species. The species succession on chronosequence is well demonstrated in the genus .i.Encentrum./i..
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