Scientia Marina, Vol 67, No 3 (2003)

The effect of food on the respiration rates of Daphnia magna using a flow-through system


https://doi.org/10.3989/scimar.2003.67n3361

Claire Schmoker
Institut de Zoologie, Université de Liège, Belgium

Santiago Hernández-León
Biological Oceanography Laboratory, Facultad de Ciencias del Mar, Universidad de Las Palmas de Gran Canaria, Spain

Abstract


Respiration rates and gut fluorescence of the cladoceran Daphnia magna were studied using a flow-through system. This open system has the advantage of introducing food or producing a starvation effect during the course of the experiment. Severe variations in respiratory rates were observed in relation to the presence or absence of food, indicating short-term variability. Organisms kept starved or at low food for a long period (15-20 h) responded to a sudden increase in food by increasing their respiration rates three- to four-fold in parallel with their gut content. A significant relationship between gut fluorescence and respiration rates was observed, suggesting that feeding and the related swimming activity were responsible for the observed metabolic variability.

Keywords


zooplankton; metabolism; feeding

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