Lampert 1986 Oecologia

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Lampert W (1986) Response of the respiratory rate of Daphnia magna to changing food conditions. Oecologia 70:495-501.

» Oecologia 70: 495-501

Lampert W (1986) Oecologia

Abstract: The respiratory rate of the cladoceran Daphnia magna was measured at varying concentrations of a green alga in a flow-through respirometer. Daphnids were either preconditioned to the respective food concentration or the food concentration was suddenly changed during the experiment and the response of the respiratory rate monitored. Previously starved animals were provided with food or prefed animals were deprived of food. The respiratory rate increased considerably with increasing concentrations of algae until a maximum rate was reached at a critical algal concentration corresponding to the "incipient limiting level" for feeding. The response of the respiratory rate to changing food conditions was fast, lagging only a few minutes behind the change in food. The respiratory rate of starved daphnids increased quickly when they received food, even at low concentrations. Prefed daphnids responded to the replacement of the food suspension by filtered water with reductions in their respiratory rates. A linear relationship between the assimilation rate and the respiration rate was found, indicating that the more than twofold range of the respiratory rate was due to specific dynamic action. The SDA coefficients of 0.15-0.24 found for Daphnia are consistent with values for marine zooplankton. Keywords: Twin-Flow, Daphnia, Respiration, Food concentration, Starvation, Plankton, Specific dynamic action


Labels:


Organism: Crustaceans 

Preparation: Intact organism 


Coupling state: OXPHOS 


Twin-Flow