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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
The distribution and role of UV reflectant patterns in Scarab beetles (Coleoptera: Scarabaeidae)
 Vlach, Jan ; Šípek, Petr (advisor) ; Kleisner, Karel (referee)
The diploma thesis is focused on the distribution and role of UV reflectant patterns in beetles (Coleoptera) with focus on the family Scarabaeidae. Through a survey of European museum collections, we discovered over 900 species of UV reflectant beetles, of which 850 species were identified as UV reflectant for the first time. The surface structures responsible for UV reflectant patterns in beetles were studied in detail using a scanning electron microscope. We have identified two ways how the UV reflectant patterns occur. The first way: the light rays interact with the internal structure of the cuticular formations or the cuticle itself; the second way: the light rays interact with the surface layer formed by cuticular secretion. Additionally we carried out experiments with live animals, where we investigated the effect of an individual's age on the intensity of UV reflectant patterns and the effect of UV reflectance on reproductive activity. In a pilot study we were able to show that freshly hatched individuals show a higher level of UV reflectance than older individuals.
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Sexual dimorphism and excessive structures of Scarab beetles (Coleoptera: Scarabaeoidea)
 Kouklík, Ondřej ; Šípek, Petr (advisor) ; Bezděk, Aleš (referee)
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