Thus the physiology of a temperate tuna (e.g. bluefin and albacore) must be
able to respond to the thermal challenges of cooler temperatures during
bouts of foraging at high latitudes in colder seas, and warmer temperatures
at lower-latitude spawning grounds. Such broad ecological ranges
would potentially select for a eurythermal physiologywith Hb–O2 binding
that responds across a broad thermal range, a common situation in
ectotherms occupying wide thermal niches