Evidence for Sleep in Sharks and Rays: Behavioural, Physiological, and Evolutionary Considerations

Michael L. Kelly, Shaun P. Collin, Jan M. Hemmi, John A. Lesku

Research output: Contribution to journalReview article

2 Citations (Scopus)

Abstract

Sleep is widespread across the animal kingdom. However, most comparative sleep data exist for terrestrial vertebrates, with much less known about sleep in amphibians, bony fishes, and invertebrates. There is an absence of knowledge on sleep in cartilaginous fishes. Sharks and rays are amongst the earliest vertebrates, and may hold clues to the evolutionary history of sleep and sleep states found in more derived animals, such as mammals and birds. Here, we review the literature concerning activity patterns, sleep behaviour, and electrophysiological evidence for sleep in cartilaginous (and bony) fishes following an exhaustive literature search that found more than 80 relevant studies in laboratory and field environments. Evidence for sleep in sharks and rays that respire without swimming is preliminary; evidence for sleep in continuously swimming fishes is currently absent. We discuss ways in which the latter group might sleep concurrent with sustained movement, and conclude with suggestions for future studies in order to provide more comprehensive data on when, how, and why sharks and rays sleep.

Original languageEnglish
JournalBrain, Behavior and Evolution
DOIs
Publication statusPublished - 27 Nov 2019

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Sharks
Sleep
Fishes
Vertebrates
Amphibians
Invertebrates
Birds
Mammals

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title = "Evidence for Sleep in Sharks and Rays: Behavioural, Physiological, and Evolutionary Considerations",
abstract = "Sleep is widespread across the animal kingdom. However, most comparative sleep data exist for terrestrial vertebrates, with much less known about sleep in amphibians, bony fishes, and invertebrates. There is an absence of knowledge on sleep in cartilaginous fishes. Sharks and rays are amongst the earliest vertebrates, and may hold clues to the evolutionary history of sleep and sleep states found in more derived animals, such as mammals and birds. Here, we review the literature concerning activity patterns, sleep behaviour, and electrophysiological evidence for sleep in cartilaginous (and bony) fishes following an exhaustive literature search that found more than 80 relevant studies in laboratory and field environments. Evidence for sleep in sharks and rays that respire without swimming is preliminary; evidence for sleep in continuously swimming fishes is currently absent. We discuss ways in which the latter group might sleep concurrent with sustained movement, and conclude with suggestions for future studies in order to provide more comprehensive data on when, how, and why sharks and rays sleep.",
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Evidence for Sleep in Sharks and Rays : Behavioural, Physiological, and Evolutionary Considerations. / Kelly, Michael L.; Collin, Shaun P.; Hemmi, Jan M.; Lesku, John A.

In: Brain, Behavior and Evolution, 27.11.2019.

Research output: Contribution to journalReview article

TY - JOUR

T1 - Evidence for Sleep in Sharks and Rays

T2 - Behavioural, Physiological, and Evolutionary Considerations

AU - Kelly, Michael L.

AU - Collin, Shaun P.

AU - Hemmi, Jan M.

AU - Lesku, John A.

PY - 2019/11/27

Y1 - 2019/11/27

N2 - Sleep is widespread across the animal kingdom. However, most comparative sleep data exist for terrestrial vertebrates, with much less known about sleep in amphibians, bony fishes, and invertebrates. There is an absence of knowledge on sleep in cartilaginous fishes. Sharks and rays are amongst the earliest vertebrates, and may hold clues to the evolutionary history of sleep and sleep states found in more derived animals, such as mammals and birds. Here, we review the literature concerning activity patterns, sleep behaviour, and electrophysiological evidence for sleep in cartilaginous (and bony) fishes following an exhaustive literature search that found more than 80 relevant studies in laboratory and field environments. Evidence for sleep in sharks and rays that respire without swimming is preliminary; evidence for sleep in continuously swimming fishes is currently absent. We discuss ways in which the latter group might sleep concurrent with sustained movement, and conclude with suggestions for future studies in order to provide more comprehensive data on when, how, and why sharks and rays sleep.

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KW - Cartilaginous fishes

KW - Elasmobranchs

KW - Electrophysiology

KW - Ram ventilators

KW - Unihemispheric sleep

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DO - 10.1159/000504123

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