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Fig. 2. Mass-specific oxygen consumption rates in progressive hypoxia for four species of scyphomedusae. Squares, Phacellophora camtschatica (N=7); circles, Aurelia labiata (N=7); triangles, Cyanea capillata (N=1); diamonds, Chrysaora quinquecirrha (N=1). Critical partial pressures of oxygen were determined to be 9.1±1.4, 9.0±1.9, 14.6 and 12.3 hPa for P. camtschatica, A. labiata, C. capillata and C. quinquecirrha, respectively. Values are means ± S.E.M. Temperature and salinity were 10°C and 30 psu for experiments with P. camtschatica, A. labiata, and C. capillata; for C. quinquecirrha, 25°C and 12 psu, respectively.