Sleep behaviour: Sleep in continuously active dolphins

@article{Sekiguchi2006SleepBS,
  title={Sleep behaviour: Sleep in continuously active dolphins},
  author={Yuske Sekiguchi and Kazutoshi Arai and Shiro Kohshima},
  journal={Nature},
  year={2006},
  volume={441},
  pages={E9-E10}
}
Arising from: O. Lyamin, J. Pryaslova, V. Lance & J. Siegel 435, 1177 (2005); see also communication from Gnone et al.; Lyamin et al. reply.Sleep has been assumed to be necessary for development and to be a vital function in mammals and other animals. However, Lyamin et al. claim that in bottlenose dolphins (Tursiops truncatus) and killer whales (Orcinus orca), neonates and their mothers show almost no sleep behaviour for the first month after birth; this conclusion is based on their… 

Sleep behaviour: Sleep in continuously active dolphins; Activity and sleep in dolphins (Reply)

It is reported that immobility was absent and that typical sleep posture increases with age, a pattern opposite to that seen in all land mammals studied so far.

Vigilance in Female Bottlenose Dolphins (Tursiops sp.) Before and After Calving

It is found that mothers altered their rest strategy depending on the parturition state, and this change in swim behavior may be associated with neonatal development and may allow mothers to sustain high levels of vigilance for extended periods of time.

Behavioral aspects of sleep in bottlenose dolphin mothers and their calves

Is Sleep Beyond Our Control

To understand how sleep can be controlled research efforts need to be extended to non-standard laboratory animals that exhibit different methods of evading sleep, and emerging clues point to increased membrane excitability as the common neural process used to execute seemingly different forms of sleep-evasion.

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

Review of 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 concludes with suggestions for future studies.

Cetacean sleep: An unusual form of mammalian sleep

Sleep: Evolutionary and Adaptive Changes in Birds and Mammals

This chapter discusses the sleeping patterns, sleep strategies, and sleep consolidations across phylogeny and aging, which are essential for the current challenges in their society, where the authors experience poor sleep quality and insufficient sleep and they wake up tired almost every day.

Sleep research goes wild: new methods and approaches to investigate the ecology, evolution and functions of sleep

The initial studies to ‘go wild’ have revealed a wealth of interindividual variation in sleep, and shown that sleep duration is not even fixed within an individual, but instead varies in response to an assortment of ecological demands.

References

SHOWING 1-10 OF 10 REFERENCES

Animal behaviour: Continuous activity in cetaceans after birth

It is shown that, unlike terrestrial mammals, killer-whale and bottlenose-dolphin neonates and their mothers show little or no typical sleep behaviour for the first postpartum month, avoiding obstacles and remaining mobile for 24 hours a day.

BEHAVIORAL ASPECTS OF SLEEP IN PACIFIC WHITE‐SIDED DOLPHINS (LAGENORHYNCHUS OBLIQUIDENS, GILL 1865)

The behavioral and social aspects of sleep are described in a captive school of four Pacific white-sided dolphins at Long Marine Lab at the University of California at Santa Cruz for 32 nights to suggest that this allows sleep to proceed while allowing dolphins to maintain visual contact with group members.

Relationship between sleep and eye state in Cetaceans and Pinnipeds.

The available data suggest that two functions of USWS/EEG asymmetry during SWS in Cetaceans and fur seals are multisensory control of the environment and maintenance of motion and postures of sleep.

Development of sleep state patterns in the kitten

Ontogenetic development of the human sleep-dream cycle.

REPORTS Stratigraphy of the Wisconsin Range, Horlick Mountains, Antarctica, and Dechlorination of DDT by Aerobacter aerogenes, Antarctica.

Stress response genes protect against lethal effects of sleep deprivation in Drosophila

The observation that flies carrying a mutation for the heat-shock protein Hsp83 showed exaggerated homeostatic response and died after sleep deprivation represents the first step in identifying the molecular mechanisms that constitute the sleep homeostat.

Physiological correlates of prolonged sleep deprivation in rats.

The issue of whether sleep is physiologically necessary has been unresolved because experiments that reported deleterious effects of sleep deprivation did not control for the stimuli used to prevent