MO2, behaviour data and supplementary material for the first physiological evidence of sleep in sharks

Michael Kelly, Selwyn Collins, John Lesku, Jan Hemmi, Shaun Collin & Craig Radford
Sharks represent the earliest group of jawed vertebrates and as such, they may provide original insight for understanding the evolution of sleep in more derived animals. Unfortunately, beyond a single behavioural investigation, very little is known about sleep in these ancient predators. As such, recordings of physiological indicators of sleep in sharks have never been reported. Reduced energy expenditure arising from sustained restfulness and lowered metabolic rate during sleep have given rise to the hypothesis...
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