About the only change in activity, I would expect, would involve a change in air breathing water borne sea life, that may be limited by the ice cover. (realclimate.org)
• Although sea turtles are air breathing reptiles, they can hold their breath underwater anywhere from four to seven hours. (okcpetsmagazine.com)
«The ability to not eat much and sustain it in a way where you don't lose weight, feel sick or get spaced out is directly proportional to your ability to limit the amount of air you breathe in,» he says. (womenshealthandfitness.com.au)