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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
Microhabitat preferences for overwintering water bugs
 ČIHÁK, Petr
This diploma thesis deals with overwintering of water bugs. The goal of the thesis is to experimentally find out what microhabitats do these water bugs prefer for overwintering. The experiment took place in the greenhouse in the educational garden of PF JU in České Budějovice (48° 58'32.182 "N, 14° 26'54.218" E) from the beginning of November 2017 to the beginning of March 2018. Terrestrial and water microhabitats were created in the greenhouse. They served as a place for potential overwintering of the water bugs. Defined numbers of individuals of given species were put into the center of the greenhouse in boxes with small amount of water. The source of the water bugs were surrounding ponds and a pool in the educational garden. At the end of the experiment, all microhabitats and their surroundings were closely looked through. The found individuals (both alive and dead) were counted and put into sample containers filled with concentrated alcohol. The results are following. Notonectidae prefer mainly water microhabitats, mainly when there are rotting leaves. Corixidae do not prefer any of these microhabitats and presumably they escaped through the little holes in the greenhouse. Nepidae stayed in the original box throughout the experiment. The Ranatra linearis died, whereas Nepa cinerea survived until frosts that caused complete freezing for several following days.
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