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Vliv a význam aktivního managementu v nížinných lesích na epigeickou faunu pavouků
Vymazalová, Pavla
In the thesis was investigated the influence and importance of active management in lowland forests on epigeic spider fauna. The research was carried out on 15 randomly chosen research plots in the NPR Děvín (The Pálava Protected Landscape Area). Together, the research took place on 15 plots with 3 tretaments on each plot: heavy thinning, moderate thinning, control plots (no management). The spiders were collected using pitfall traps when three pitfall traps in each transect were placed five meters between each other across the central axis of each research plot. The results show that locatity is characteric by high abundance and species richness of spiders. Overall, 3683 adult spiders belonging to 21 families, 70 genera and 116 species were collected and determined, including high presence of rare and endangered species. The species richness and number of conservation bioindicators had the highest values on plots where heavy thinning was applied. The abundance of spiders had the highest values in a moderate thinning, mainly due to dominant species Pardosa lugubris (Walckenaer, 1802) and Trochosa terricola (Thorell, 1856). Functional diversity was significantly higher in open stands, however, the individual functional features (e.g. spider hunting strategies) were equally dispersed in all types of forest stands. The evenness of these functional groups depend on the coverage and density of vegetation. The research show that the most appropriate for biodiversity conservation in lowland forest reserves is to return to active management, but not across the whole area. It is necessary to preserve the mosaicity of lowland oak forests, it means preserve heterogeneity of microhabitats in the stand because different species and ecological groups of spiders prefer different ecological conditions. This can support the overall biodiversity of lowland forest ecosystems. In comparison with other studies, these conclusions are applicable to other groups of organisms occurring in the lowland forests of the Czech Republic.
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Reptile assemblages along succession gradient in oak forests of Podyji National Park
BALOUN, Jaroslav
This thesis focuses on the effects of succession on forest clearings on reptile assemblages in Podyjí National Park. The topic and results presented here follow up my bachelor thesis evaluating habitat preference of reptiles in Podyjí National Park and their assemblages on experimental clearings in the core zone of NP Podyjí. The reptile monitoring was conducted on the clearings and nearby control habitats using a method of artifical shelters and method of transect walks. Abundance of reptile species on clearings, and effect of gradual succession on the clearings on individual reptile species was studied and evaluated. While the creation of clearings clearly benefited most termophilous reptile species, including e.g. the Green lizard (Lacerta viridis) and the Aesculapian snake (Zamenis longissimus), the effect of succession is more difficult to assess owing to rather high variation among years. Only the L. viridis significantly derceased with the course of succession, while the Slow worm (Anguis fragilis) benefited from it.
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The importance of clearings on plant communities in Podyjí National Park
Pusztaiová, Zuzana ; Münzbergová, Zuzana (advisor) ; Macek, Martin (referee)
In this thesis I deal with various aspects of influence of clearings on plant communities in NP Podyjí. Special space is dedicated to light-demanding, threatened and alien plant species, and their response to light improvement. The area of the Podyjí NP has been used by people continuously for a very long time. There is therefore a whole range of plant species, linked to a certain anthropogenic disturbance regime. I observed the development of plant communities using phytocenological relevés on six pairs of clearings (isolated and connected with open habitats), created in 2011 and 2012. At the same time, I also investigated the adjacent closed-canopy forests and open forests on the edge of the canyon. During the first year after cutting, there was a significant increase in diversity and species cover in the clearings. In the following years, significant changes took place on isolated clearings, as the zone of closed-canopy forest delayed low colonization by new individuals in first years. In the clearings, diversity and abundance of plants were significantly higher than in the closed-canopy forest and open forest. The number of endangered plant species was the highest in open forest. Several unique species of endangered plants have been recorded on clearings. These species have not been found in...
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Vliv světelných podmínek listnatých lesů I. a II. vegetačního stupně na epigeickou faunu pavouků
Surovcová, Kamila
The objective of the present study was to investigate the impact of canopy openness and associated light conditions on epigeal spider assemblages in abandoned coppice forests in order to develop conservation recommendations for forest management in lowland woodlands. In particular, I studied the effect of canopy openness gradient on species richness, abundance, functional diversity, community composition, conservation value, and degree of rareness of spiders. There was established transects reflecting the canopy openness gradient in each of the eight forest stand. A total number of 90 spider species, including high proportions of xeric specialist and red-listed threatened species. The peaks of conservation indicators, as well as spider community abundance, were shifted toward more open canopies . On the other hand, functional diversity peaked at more closed canopies followed by a rapid decrease with increasing canopy openness. Species richness was highest in the middle of the canopy openness gradient, suggesting an ecotone effect. Ordinations revealed the rapid species turnover along canopy openness gradient with presence of most conservationally important species in sparse and open conditions. The results show that the various components of biodiversity peaked at different levels of canopy openness. Therefore, the restoration and suitable management of such conditions (e.g. conservation thinning, coppice management) will retain important diversification of habitats in lowland oak forests. According to these results, even small-scale activities supporting these conditions could be suitable conservation tools to slow down the general decline of woodland biodiversity.
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