|
|
Dependence of selected antagonists on Lymantria dispar abundance
Jelínková, Zuzana ; Lukášová, Karolina (advisor) ; Holuša, Jaroslav (referee)
The aim of this study was to investigate the dependence of selected antagonists to the abundance of Lymantria dispar. The aim of the study was to determine whether these natural enemies can affect the abundance of L. dispar. I have focused on South Moravia, where L. dispar occurs. In 2015 the Turček method reviewed a total of 3,600 trees in seven locations with the historical appearance of outbreaks of gypsy moth. Density egg clutches were extremely low, about 0.019 for each new clutch per tree, which corresponds to the latent state.
On the studied locations egg clutches was collected, measured and recorded in notebooks. A load with at least one egg in each area was removed with the top 5 cm of litter and a top layer of mineral soil. The removed soil was put into pots in which were stored late instar caterpillars for the detection of E. maimaiga. The cups were inserted along with the caterpillars in the refrigerator for three days at 15°C without food. Aafter three days the caterpillars were taken away individually and placed on an artificial diet. An inspection was performed and a their mortality was monitored. The presence of E. maimaiga was examined microscopically for 325 dead caterpillars, but no pathogen was detected.
In the laboratory, the individual egg clutches were placed upon a Petri dishes with filter paper and the number of eggs counted with a stereo microscope. Subsequently, the eggs were left to hatch and were analyzed for the presence of parasitoids. A total of 1 246 species of egg parasitoids Anastatus japonicus was found in six locations, taking in donations females predominated. Egg parasitism was on average around 5%. Flight activity A. japonicus was quite long and covered the period 24 May 2015 to 28 July 2015.
In the absence of E. maimaiga and low egg parasitism at the studied locations we do not expect any strong influence of the studied antagonists on population density and outbreak cycle L. dispar in South Moravia.
|
|
|
Problems of humic matters as precursor of trihalomethanes (THMs) in water
Jelínková, Zuzana ; Dolejš, Petr (referee) ; Doležalová Weissmannová, Helena (advisor)
The bachelor’s thesis deals with qualities of humic matters, their origins, structures and occurrence in aquatic environment. There are suitable methods for determination of humic substances and processes used for their removing from water. The thesis describes disinfection of water and related origin of trihalomethanes. The aim of the experimental part of the thesis is to coagulate model humic water on the laboratory mixing column including suggestion of optimal dose of selected coagulation agent and comparison of effectivity of floccules separation by membrane filtration and centrifugation. Effectivity of the removal of humic matters was determined by measuring water absorbance at wavelengths 245 nm in a silica cuvette with optical 1 cm trajectory and at 387 nm in a glass cuvette with optical 5 cm trajectory. For evaluation of quality suspension concentration of residual iron of coagulation agent in water was determined.
|
|
|
The using of project method in education of students of secondary agriculture school
JELÍNKOVÁ, Zuzana
The thesis concerns the usage of project based learning in vocational schools. In theoretical part we summarize definitions, including discussion of role of project based learning in pedagogical theory. Then historical concept follows, characterisation and integration of project based learning into curricula documents. Practical part concerns about creations and realization of own project in vocational school during ecological education. Research focuses at evaluation of principles of project based learning in real situation. Results of thesis show fulfilling of principles and high potential of using project based learning for obtaining the key competences which are defined for high school education.
|
|
|
Selected methods of evaluation of ecosystem functions of nature onto example of floodplain of river Lužnice
JELÍNKOVÁ, Zuzana
Diploma thesis deals with detailed analysis and following application of selected economical methods for evaluation of ecosystems services and functions of nature onto concrete example of floodplain of river Lužnice. For the determination of economical potential of landscape, Contingent Valuation Method, Method of Pointing Valuation of Biotopes of the Czech Republic and Replacement Cost Method, was applicated. According to achieved results, the comparison of usability and effectivity of various methods of evaluation of landscape, was performed. Presented thesis is completed by sociological survey of stakeholders in relation to the model area.
|
guest ::
RSS feed.