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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Factors affecting population dynamics of endangered plant species Dianthus arenarius subsp. bohemicus
 Sejrková, Petra ; Dostálek, Tomáš (advisor) ; Ekrtová, Ester (referee)
This diploma's thesis deals with critically endangered species Dianthus arenarius subsp. bohemicus from family Caryophyllaceae. Its distribution range is now limited on its last natural locality in National natural monument Kleneč. As a result of the change in land use (especially the abandonment of grazing), there was a significant reduction in its population size at the end of the 20th century and it was close to extinction. That is why action plan for species conservation was approved, which included number of management interventions at the locality. The most important was the removal of the upper humus horizon, which aims to create free gaps in the sand that allow the emergence and growth of new plants of D. arenarius subsp. bohemicus. The study species is also attacked by herbivores and it was predicted that increasing population might be endangered with increased herbivore population. The aim of this thesis is therefore to describe the population dynamics of the species, to evaluate the effect of the management and to determine how the herbivory affects the population dynamics of the species. The population growth rate decreases over time with vegetation succession. Even eight years after removal the population is still growing. The population growth rate is most affected by change in...
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Population biology of Dianthus arenarius subsp. bohemicus
 Špalová, Zuzana ; Raabová, Jana (referee) ; Münzbergová, Zuzana (advisor)
Dianthus arenarius subsp. bohemicus is a critically endangered plant which is endemic in the Czech Republic. The estimated number of plants is about 1400 (observation from 2008). In the Natura 2000 project Dianthus arenarius subsp. bohemicus is included among priority species. The major cause of threat of this species is probably change in land use - tree planting and the abandonment of traditional pasturage. Despite of conservation effort since seventies, population still declined until 1999 when large-scale sod-cutting was carried out. This management lead to rise of number of plants from 200 to 1400 clusters. In 2008 Ministry of the Environment of the Czech Republic approved Action plan forf Dianthus arenarius subsp. bohemicus which is now implemented. Part of this plan is a study of population dynamics of the species. This study will be an object of my Diploma thesis. This bachelor's thesis is a comprehensive literature survey about Dianthus arenarius subsp. bohemicus. In the literary overview itself there are summarized results of works, incl. the practical application of the data in conservation programs.
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