|
|
Hmyzí anti-stresové reakce vůči přírodním toxinům
FEDOR, Tereza
The aim of this bachelor thesis was to characterize the effect of Bt (Bacillus thuringiensis) toxin on adipokinetic hormone (AKH) levels in the brain, on the activity of digestive enzymes (lipases, proteases, glucosideases, amylases) in the midgut and on nutrient levels (lipids, proteins, glycides) in the haemolymph of the firebug (Pyrrhocoris apterus). Bt toxin was applied by injection to the adult males 24 hours before monitoring of the above mentioned physiological characteristics. The results showed that Bt toxin reduced AKH level in the brain, modulated level of nutrients in haemolymph, but did not change activity of digestive enzymes in the midgut.
|
|
|
Recognition of inconspicuous prey: importance of additional visual cues
KARLÍKOVÁ, Zuzana
The ability of wild caught great tits (Parus major) to discriminate between equally coloured edible (roach - Blaptica dubia) and inedible prey (firebug - Pyrrhocoris apterus) was tested with respect to other visual traits (shape of legs, antennae,means of locomotion). To simulate more natural conditions, three different experiment types were carried out. Prey was presented either alternately (first roach or firebug) or simultaneously. Additionally, the effect of learning and memory was tested by the use of trial repetition during one session, and session repetition after one week.
|
|
| |
|
| |
|
| |
guest ::
