|
|
Comparsion of treated logs and pheromone traps on spruce bark beetle in hills
Petrák, Karel ; Holuša, Jaroslav (advisor) ; Lukášová, Karolína (referee)
Purpose of this thesis was comparing of spruce bark beetle (Ips typographus) trapping methods in uplands. In six areas in region of Neveklov, there were installed pairs of devices, namely a slot trap type Theysohn and a poisoned tripod trap tree with pheromone evaporator. During the swarming activity of bark beetles, from April to the end of September 2015, the traps were controlled and bark beetles captured and counted. Evaluation is based on laboratory determination, number of captured beetles and determination of sex ratio. It was also made an economical comparison of both methods. During this study was captured in total 34.495 pieces of spruce bark beetle in two generations. Statistically there was no difference between number of captured beetles into slot traps or into tripod traps.
|
|
|
Giant traps for fishing in the inflow-zone of the Římov reservoir
Hladík, Milan ; Kubečka, Jan ; Pokorný, P. ; Čech, Martin ; Draštík, Vladislav ; Kratochvíl, Michal ; Peterka, Jiří ; Prchalová, Marie ; Vašek, Mojmír
The fish stock of the inflow-zone of the Římov Reservoir was studied by using two special constructed big traps. One trap was sampling the fish migrating from the reservoir to the Malse River, the other was sampling downstream migrants. The most intensive fish movement was recorded during spring spawning season. Proportionally to the fish stock of the reservoir, the tributary zone was used mainly by the bleak, .i.Alburnus alburnus./i., Asp, .i.Aspius aspius./i. and roach .i.Rutilus rutilus./i.. Smaller affinity to tributary spawning was found for the bream .i.Abramis brama./i. and perch, .i.Perca fluviatilis./i. (5 to 10 % of reservoir fish spawning in the tributary). Over 6000 kg of migrating fish were captured in the tributary area during spring periods of three years. Consequences of the application of tributary traps for fish exploitation and management are being discussed.
|
guest ::
