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JPR Advance Access originally published online on February 27, 2004
Journal of Plankton Research 2004 26(5):525-534; doi:10.1093/plankt/fbh056
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Journal of Plankton Research Vol. 26 No. 5 © Oxford University Press 2004; all rights reserved

Respiratory electron transport system (ETS) activity as an estimator of the thermal tolerance of two Daphnia hybrids

Tatjana Simcic* and Anton Brancelj

National Institute of Biology, Vecna POT 111, SI-1000 Ljubljana, Slovenia

* Corresponding Author: tatjana.simcic{at}nib.si

The influence of temperature on the activity of the respiratory electron transport system (ETS) was measured in one clone of Daphnia hyalina x galeata and one of Daphnia cucullata x galeata, isolated from Lake Bled (Slovenia). The ETS activity of ovigerous females acclimated to 7, 20 and 25°C, was measured at 5, 10, 15, 20, 25 and 30°C. Population growth experiments showed that D. cucullata x galeata grew better at high rather than low temperatures. Daphnia hyalina x galeata, however, grew more successfully at low temperatures than did D. cucullata x galeata. The highest Q10 of ETS activity of D. cucullata x galeata at the lowest temperature range of 5–15°C indicated the absence of enzymes that could function sufficiently well at low temperatures. The ETS activity of the warm-acclimated hybrid D. hyalina x galeata reached a maximum at an incubation temperature of 20°C, while D. cucullata x galeata had maximal ETS activity at 25°C. Thus D. cucullata x galeata has a more efficient enzyme system than D. hyalina x galeata at the higher temperature. The higher Arrhenius activation energy (Ea) for D. cucullata x galeata than for D. hyalina x galeata indicates that enzymes from D. cucullata x galeata are more temperature sensitive than those from D. hyalina x galeata. In conclusion, the ETS of D. cucullata x galeata is adapted to a higher temperature and to narrower temperature fluctuations than that of D. hyalina x galeata.


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