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Study of ecosystem impact of giant hogweed (Heracleum mantegazzianum) invasion
Hladík, Marek ; Pergl, Jan (advisor) ; Hadincová, Věroslava (referee)
The present study deals with ecological impact of giant hogweed (Heracleum mantegazzianum) invasion in Slavkovský les area. Being one of the prominent invasive species with significant impact on human health it has been subjected to a wide research. In spite of that little is known about its impact on the invaded ecosystem. My research was therefore focused on analysis of the ecosystem impact, particulary 1) microclimatic measurements of temperature and soil moisture and their comparisons between invaded and noninvaded vegetation, 2) comparison of germination and survival of model plant species sowed into invaded and noninvaded plots and 3) study of the effect of H. mantegazzianum presence on model species seed production. Results have shown significant alteration of microclimate due to H. mantegazzianum invasion. Further research is needed to resolve what impact it may pose to species in invaded communities. The effect of Heracleum mantegazzianum presence on germination and survival of model species was not significant. Similarly, seed production of model plants was not significantly affected.
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Giant hogweed - negative impact of invasion and means of eradication
Uhlíková, Martina ; Müllerová, Jana (advisor) ; Pergl, Jan (referee)
Giant hogweed - negative impact of invasion and means of eradication Invasions represent in most cases negative aspects of current globalized world. Dispersion of non-native species occurs daily and it is caused by anthropogenic or natural processes. Plant species belong to the best described invasive organisms. An emblematic species of plant invasions in the Czech Republic is giant hogweed, Heracleum mantegazzianum. It is one of the most detailed documented non-native species occurring in this country. Due to its qualities hogweed spreads quickly and establishes large stands, which can negatively influence surroundings and lead to both ecologic end economic damage. Compared to other invasive plant species of the Czech Republic, giant hogweed has also negative effects on human health. Due to these characteristics giant hogweed has been an object of interest of many scientific projects, e.g. Giant Alien, aiming to understand attributes that enable its successful invasion. This thesis attempts to give a summary of attributes enabling succesful penetration of giant hogweed into environment, and alert to its negative impact that influences also human activities. Presented data include properties causing hogweed's successfull spread, and means of its eradication. Major part of thesis is devoted to...
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Study of ecosystem impact of giant hogweed (Heracleum mantegazzianum) invasion
Hladík, Marek ; Pergl, Jan (advisor) ; Hadincová, Věroslava (referee)
The present study deals with ecological impact of giant hogweed (Heracleum mantegazzianum) invasion in Slavkovský les area. Being one of the prominent invasive species with significant impact on human health it has been subjected to a wide research. In spite of that little is known about its impact on the invaded ecosystem. My research was therefore focused on analysis of the ecosystem impact, particulary 1) microclimatic measurements of temperature and soil moisture and their comparisons between invaded and noninvaded vegetation, 2) comparison of germination and survival of model plant species sowed into invaded and noninvaded plots and 3) study of the effect of H. mantegazzianum presence on model species seed production. Results have shown significant alteration of microclimate due to H. mantegazzianum invasion. Further research is needed to resolve what impact it may pose to species in invaded communities. The effect of Heracleum mantegazzianum presence on germination and survival of model species was not significant. Similarly, seed production of model plants was not significantly affected.
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MONITORING OF CHOSEN NON-INDIGENOUS PLANT SPECIES IN SELECTED LOCATIONS OF THE SOUTH BOHEMIAN REGION (FOR EXAMPLE DISTRICT OF ČESKÝ KRUMLOV AND ČESKÉ BUDĚJOVICE)
KORFOVÁ, Gabriela
The main aim of this dissertation is to determine the global occurence of geografically non-indigenous plant species - Giant Hogweed (Heracleum mantegazzianum), Himalayan balsam (Impatiens glandulifera), Japanese knotweed (Reynoutria japonika), Sakhalin knotweed (Reynoutria sachalinensis) and Reynoutria x bohemika in selected locations of the South Bohemian region, for example in district of Český Krumlov and České Budějovice. The theoretical part is focused on the characteristics of selected localities where there is an occurrence of these plants and description of the above-mentioned invasive plant species and thier subsequent liquidation. The result of the dissertation (of the work) are the map´s outputs processed in the Geographic Information System, which record the global occurance of geografically non-indigenous plant species.
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Economic efficiency of invasive species eradication in Czech republic shown on example of Giant Hogweed
Linc, Ondřej ; Gráf, Václav (advisor) ; Petrášek, František (referee)
The aim of this work is to estimate the damage to environment caused by invasive plant Giant Hogweed (Heracleum mantegazzianum) in Czech Republic. Using the Replacement costs method I found that the damages reach about 2.5 millions CZK each year. That equals amount of money annualy spent on eradication of Giant Hogweed by government. Model of elimination of the plant in CR subsequently revealed that the costs of its total eradication equals about 170 millions CZK a year in a five year project. Such project would be uneconomical at present, but postponing the solution causes nearly exponential increase of its future costs.
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