Fig. 2.

Inactive mass-specific oxygen consumption rates (IMR, μmol O₂ g⁻¹ h⁻¹) in jumbo squid, Dosidicus gigas. (A) Effect of temperature and oxygen (hypoxia, 1% O₂; normoxia, 21% O₂) on IMR. Values are means ± SE (more details in supporting online material, Table S2). (B) Comparison of estimated IMR (μmol O₂ g⁻¹ h⁻¹) of jumbo squid and the standard metabolic rate (calculated by extrapolating to zero speed) of other top predators in the Eastern Tropical Pacific (ETP) (sources for shark and tuna data are available in Table S3). Rates were estimated for 1-kg animals and standardized to 20°C, assuming a Q₁₀ of 2 and a scaling coefficient of −0.25 for fishes. For D. gigas, the extrapolation to bigger size was based on the common tendency for isometric metabolic scaling (IMR = aM^0.04 at 20°C, Table S2) in muscular squids (22).