... is the ṀO2 for a regulated and depressed aerobic metabolic rate. Points A–C are the critical O2 tension (Pcrit) for each ṀO2 state level. Zones of oxyregulation and oxyconformation are shown for the ṀO2,std Pcrit curve. PwO2, partial pressure of O2 in water. P crit is the lowest P w O 2  at which...

.... The effect of aerial hypoxia on respiratory traits in four isogenic strains of Kryptolebias marmoratus. (A) Critical O2 tension (Pcrit), (B) regulation index (RI) and (C) routine metabolic rate (RMR). Fish were acclimated to air for 0, 1, 3 and 7 days. Data are presented as means±s.e.m. (N=8–16). Different...

... temperatures. Also shown is the critical oxygen tension (Pcrit) of the two species, which is where AS is zero. Note that, at PwO2 levels above Pcrit, routine metabolic rate (RMR) was greater than SMR in both species because of spontaneous activity. Despite the large reductions in AS, the CTmax of both species...

... () and critical O2 tension (Pcrit) values of epaulette sharks and shovelnose rays exposed to progressive decreases in water PO2 (PwO2). See Table 1 and Materials and methods for further information on time course and starting and ending PwO2 of the exposures. Data are means ± s.e.m. (N=7 for epaulette sharks; N=8...

... of hypoxia representing 40% of each species' respective critical O2 tension of whole-animal O2 consumption rate, Pcrit (PwO2=2.0 and 3.1 kPa, respectively) and in epaulette sharks exposed to 20% of Pcrit (PwO2=1.0 kPa). Data are means ± s.e.m. (N=5–7 for epaulette sharks; N=4–7 for shovelnose rays). Values...

... a=738.01 and b=23.31 for the normocythaemic treatment and a=427.42 and b=20.98 for the anaemic treatment. Pcrit, critical oxygen partial pressure; , metabolic oxygen consumption. Anaemic fish avoided hypoxia at significantly higher P O 2 (6.6±2.5 kPa) than did fish from the normocythaemic...