Abstract
Electron transport system activity (ETS) andrespiratory rate (R) were measured in five Daphnia species at different temperatures in thelaboratory. The animals were collected from differenthabitats: Daphnia hyalina Leydig from aneutrophic subalpine lake, D. pulicariaForbes from an oligotrophic high-mountainlake, D. pulex Leydig from a temporary lowlandpool, and D. obtusa Kurz from a temporaryhighland pool. D. magna Straus was obtained fromlaboratory cultures.ETS activities and respiratory rates were studied injuveniles and adult females without eggs. The rateswere measured at 5, 10, 15, and 20 °C. Foradult females Q10 of ETS-activity ranged from 1.9for D. pulicaria to 2.2 for D. obtusa. Thevalues for juvenile individuals showed greatervariations, ranging from 1.6 for D. pulicaria to3.4 for D. hyalina. Q10 values forrespiration were from 1.3 to 1.7 for adults, and from1.4 to 2.1 for juveniles. The accelerating effect oftemperature (µ) ranged from 18.5 to 93.4 kJ mol-1.Average ETS/R ratios for single species for two lifestages ranged from 1.0 to 2.5.
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Simčič, T., Brancelj, A. Electron transport system (ETS) activity and respiration rate in five Daphnia species at different temperatures. Hydrobiologia 360, 117–125 (1997). https://doi.org/10.1023/A:1003117221455
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DOI: https://doi.org/10.1023/A:1003117221455