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National Repository of Grey Literature

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Diel vertical migration of zooplankton: Proximate and ultimate factors Hutňan, Martin ; Petrusek, Adam (advisor) ; Fiala, Daniel (referee) Detailed record

Vertical distribution of the freshwater jellyfish under natural and laboratory conditions Hutňan, Martin ; Petrusek, Adam (advisor) ; Seďa, Jaromír (referee) Vertical distribution of freshwater jellyfish Craspedacusta sowerbii was observed in an experimental set-up (two thermally stratified transparent perspex columns of 78 l volume) in two seasons. Light intensity and temperature gradients were established in order to uncover influence of these factors on vertical distribution of the medusae; unlike situation in the field, these were not accompanied with hypoxic conditions in the deeper layers. Medusae accumulated at depths that corresponded to the temperature of acclimation tank. Diel vertical migrations (DVM) of male medusae were observed in a thermally stratified water body. Crustaceoplankton (main food source of Craspedacusta) also showed differences in spatial distribution during day and night. Vertical distribution of medusae was limited by the bottom border of the epilimnion. The observations lead me to the following conclusions: 1) Behavior of Craspedacusta sowerbii under laboratory conditions supported the hypothesis that change in light intensity is the primary proximate cue controlling DVM. 2) A factor playing critical role in jellyfish vertical distribution is temperature. At both laboratory and field observations, medusae aligned with the bottom border of the epilimnion; this was consistent under different oxygen stratification patterns. 3) DVM... Detailed record

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1	Hutňan, Michal

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