Figure 2

Lowered affinity of haemocyanin for oxygen in the Antarctic Pareledone charcoti . (A) Oxygen affinity, expressed as the PO₂ of haemocyanin half-saturation, (P ₅₀), and (B) venous oxygen saturation of Pareledone charcoti were compared to two octopods originating from warmer waters, Octopus pallidus and Eledone moschata, at a comparative experimental temperature of 10°C. Calculations refer to an alpha-stat adjusted venous pH of 7.27 at 10°C and a venous PO₂ of 1 kPa. Differing letters indicate significant differences (P < 0.05) between species.