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Food and host specialization in Aculeata (Hymenoptera)
Hochová, Veronika
;
Policarová, Jana
(advisor) ;
Černá, Kateřina
(referee)
Aculeata is a group of insects, its representatives vary significantly in the use of resources which are necessary for its survival and reproduction. Herbivores which live on parts of plants, carnivores which hunt other insects and omnivores are included in this group. There are also parasitic species such as cleptoparazites, brood parasites or parasitoids classified in Aculeata. Particular groups of Aculeata are adapted to resourcing, these adaptations exist in adult and immature stages simultaneously. Adaptation to the kind of source can lead to adjustment of mouthpart for easier prey hunting or nectar collecting, corbicula and special hair intended for collecting pollen or oils, a sting used for incapacitate the host or a sting for defense. Aculeata varies to such an extent how they are specialized in food and the host. Aculeata incorporates closely specialized species together with generalized species. The known information about the specialization Aculeata on food and host is summarized in this thesis.
Detailed record
Semiaquatic bugs as predators and prey and their use in natural history teaching
JANDA, Václav
The aim of this thesis is to create an overview of scientific findings about the prey and the predators of the representatives of infraorder Gerromorpha, their feeding habits and defence strategies against predators. Gerromorphans are adapted for life on the surface of various water bodies ranging from puddles to open ocean. Majority of water striders feed on insect fallen upon water surface, hatching larvae of aquatic insect or micro-crustacean. Gerromorphans locate their prey by sight and by sensory detection of ripples at water surface caused by prey. Gathering in schools turned out to be an efficient defence strategy against predators. Some species have compound eyes with specialized ommatidia which enable them to see prey on the surface as well as predator under surface. A proposal of the use of Gerromorpha in natural history teaching is part of this thesis. Gerromorphans are convenient for teaching of natural history thanks to the possibility of observation of piercing and sucking mouthparts and various food relations such as predation, cannibalism or kleptobiotic relation. Undemanding rearing of gerromorphans enables easy realization of experiments and observations under school conditions.
Detailed record
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