Makulla, A. Universitaet Hamburg, makulla@public.uni-hamburg.de

 
FOOD-MEDIATED INFLUENCE OF THE TEMPERATURE ON THE GROWTH OF DAPHNIA GALEATA
 
In order to test the indirect effects of temperature on the growth rate of Daphnia galeata, an experimental study was made in the laboratory. Scenedesmus acutus was grown in different turbidostats at 10 resp. 20 C and fed in different concentrations to juveniles of D. galeata, which were kept in a flow-through system at 10 resp. 20 C. Four different treatments were made: 10 C animals plus 10 C algae, 10 C animals plus 20 C algae, 20 C animals plus 10 C algae and 20 C animals plus 20 C algae. Specific growth rates of D. galeata are influenced by the temperature of the flow-through system. However, also indirect effects of the temperature were observed: When juveniles were exposed to 10 C and fed with 20 C Scenedesmus, there was an inhibition of the growth rate at higher food concentrations. It will be discussed, whether this effect can be due to a biochemical limitation. Fatty acids were investigated as a parameter of food quality.
 
Day: Wednesday, Feb. 3
Time: 02:15 - 02:30pm
Location: Hilton of Santa Fe
 
Code: CS66WE0215H