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Biotic and abiotic factors affecting territorial and reproductive behaviour of dragonflies (Odonata)
KYBICOVÁ, Tereza
Habitat selection, territorial behaviour and reproductive behaviour of dragonflies (Odonata) are discussed and biotic and abiotic factors affecting their territorial and reproductive behaviour are reviewed. The most important biotic factors are predation risk affecting larval survival and the presence of aquatic vegetation, which provides spatial structure. The review is complemented by a field study of territorial and reproductive behavior of dragonflies at an experimental site, at which the quality of individual pools was manipulated by a combination of the presence or absence of artificial vegetation and the presence or absence of an introduced top predator (late-instar larvae of Anax and Aeshna).
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How predation risk affects the growth and development of dragonfly larvae?
PEROUTKA, Miroslav
Predation and prey responses to predators in aquatic environment are reviewed with emphasis on non-lethal effect of predators on prey life history, antipredator behavior and related mechanisms. The review focuses on dragonfly larvae and other groups of prey with complex life histories, mainly anurans. The review is complemented by laboratory experiments examining the effects of varied food availability and predation risk on a selected species of dragonfly, Sympetrum vulgatum.
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How important are cannibalism and intraguild predation for aquatic insect communities?
PEROUTKA, Miroslav
Cannibalism and intraguild predation in the communities of aquatic insects are reviewed. Special attention is paid to the relationship of predator and prey size and to the impact of cannibalism and intraguild predation on population dynamics and individual life histories. Detection of prey and predator and antipredator strategies are also reviewed. The review is complemented by laboratory experiments on selected species of dragonflies.
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Species variability of bentic organisms in Dračice river classicifed by PERLA system
KOUTNIK, Dalibor
Examination ecological size selected part of river (from village Františkov to border with Austria) on the basis of field watching. Observed results are analysed by system PERLA. Method is based on analysing biodiversity makrozoobenthos sample from fordables running water. Sampling can be apply in running water, where water column not exceed 1 m and speed of water stream to 1 m/s. Taking is made by normal or low water stage.
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