Continuous activity in cetaceans after birth

Lyamin, Oleg I.; Pryaslova, Julia; Lance, Valentine A.; Siegel, Jerome M.

doi:10.1038/4351177a

Cited by 146 publications

(130 citation statements)

References 8 publications

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“…This explanation is consistent with the hypothesis that nursing behaviour in workers evolved from maternal traits of solitary insects [42 -44]. Interestingly, an association between maternal care and around-the-clock activity was also reported for killer-whales and bottlenosedolphins in which neonates and their mothers are active around the clock for the first postpartum month [9]. Thus, the interplay between maternal behaviour or physiology and the circadian system may be more common than previously thought.…”

Section: Discussionsupporting

confidence: 89%

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Maternity-related plasticity in circadian rhythms of bumble-bee queens

2011

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Unlike most animals studied so far in which the activity with no circadian rhythms is pathological or linked to deteriorating performance, worker bees and ants naturally care for their sibling brood around the clock with no apparent ill effects. Here, we tested whether bumble-bee queens that care alone for their first batch of offspring are also capable of a similar chronobiological plasticity. We monitored locomotor activity of Bombus terrestris queens at various life cycle stages, and queens for which we manipulated the presence of brood or removed the ovaries. We found that gynes typically emerged from the pupae with no circadian rhythms, but after several days showed robust rhythms that were not affected by mating or diapauses. Colony-founding queens with brood showed attenuated circadian rhythms, irrespective of the presence of ovaries. By contrast, queens that lost their brood switched again to activity with strong circadian rhythms. The discovery that circadian rhythms in bumble-bee queens are regulated by the life cycle and the presence of brood suggests that plasticity in the circadian clock of bees is ancient and related to maternal behaviour or physiology, and is not a derived trait that evolved with the evolution of the worker caste.

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Section: Discussionsupporting

confidence: 89%

“…The lack of circadian rhythms in nurse bees and ants and in a few other species (e.g. [9][10][11]) contrasts with evidence from most animals studied so far, including humans, in which around-the-clock activity is accompanied by increased pathologies and deterioration in performance [12].…”

Section: Introduction Worker Bumble-bees (Bombus Terrestris) Honeybementioning

confidence: 99%

Maternity-related plasticity in circadian rhythms of bumble-bee queens

2011

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“…While controversial, some data suggest cetaceans (bottlenose dolphins and killer whales) actually show less typical sleep (rest on the surface) during the first month following birth; mothers likewise suppress sleep during this time, perhaps to remain vigilant in the postpartum period (Lyamin et al 2005). The observed activity was not accompanied by stress as assayed by levels of the hormone cortisol.…”

Section: The Dolphin Dilemmamentioning

confidence: 98%

“…The observed activity was not accompanied by stress as assayed by levels of the hormone cortisol. The authors hypothesize that constant activity could be advantageous to newborns both to avoid predation and to maintain body temperature while development ensues (Lyamin et al 2005). This research was soon followed by two additional studies reaching the opposite conclusion (Gnone et al 2006;Sekiguchi et al 2006).…”

Section: The Dolphin Dilemmamentioning

confidence: 98%

Sleep and Development in Genetically Tractable Model Organisms

Kayser

Biron

2016

Genetics

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Sleep is widely recognized as essential, but without a clear singular function. Inadequate sleep impairs cognition, metabolism, immune function, and many other processes. Work in genetic model systems has greatly expanded our understanding of basic sleep neurobiology as well as introduced new concepts for why we sleep. Among these is an idea with its roots in human work nearly 50 years old: sleep in early life is crucial for normal brain maturation. Nearly all known species that sleep do so more while immature, and this increased sleep coincides with a period of exuberant synaptogenesis and massive neural circuit remodeling. Adequate sleep also appears critical for normal neurodevelopmental progression. This article describes recent findings regarding molecular and circuit mechanisms of sleep, with a focus on development and the insights garnered from models amenable to detailed genetic analyses.

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“…The sleep time typical for terrestrial conditions is immediately restored, and no symptoms of developing the recovery sleep can be seen [34]. Similarly, no rebound sleep occurs in infant dolphins and their mothers who refrain from sleeping throughout the period from the delivery till the youngsters achieve some self-sufficiency, which can last several weeks [35]. The ability to withstand sleep deprivation is dependent on the species-related natural sleep characteristics regarding the duration and quality of sleep.…”

Section: The Duration and Limit Of Sleep Timementioning

confidence: 99%

Consequences of sleep deprivation

Orzeł-Gryglewska¹

2010

International Journal of Occupational Medicine and Environmental Health

211

133

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This paper presents the history of research and the results of recent studies on the effects of sleep deprivation in animals and humans. Humans can bear several days of continuous sleeplessness, experiencing deterioration in wellbeing and effectiveness; however, also a shorter reduction in the sleep time may lead to deteriorated functioning. Sleeplessness accounts for impaired perception, difficulties in keeping concentration, vision disturbances, slower reactions, as well as the appearance of microepisodes of sleep during wakefulness which lead to lower capabilities and efficiency of task performance and to increased number of errors. Sleep deprivation results in poor memorizing, schematic thinking, which yields wrong decisions, and emotional disturbances such as deteriorated interpersonal responses and increased aggressiveness. The symptoms are accompanied by brain tissue hypometabolism, particularly in the thalamus, prefrontal, frontal and occipital cortex and motor speech centres. Sleep deficiency intensifies muscle tonus and coexisting tremor, speech performance becomes monotonous and unclear, and sensitivity to pain is higher. Sleeplessness also relates to the changes in the immune response and the pattern of hormonal secretion, of the growth hormone in particular. The risk of obesity, diabetes and cardiovascular disease increases. The impairment of performance which is caused by 20-25 hours of sleeplessness is comparable to that after ethanol intoxication at the level of 0.10% blood alcohol concentration. The consequences of chronic sleep reduction or a shallow sleep repeated for several days tend to accumulate and resemble the effects of acute sleep deprivation lasting several dozen hours. At work, such effects hinder proper performance of many essential tasks and in extreme situations (machine operation or vehicle driving), sleep loss may be hazardous to the worker and his/her environment.

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Continuous activity in cetaceans after birth

Cited by 146 publications

References 8 publications

Maternity-related plasticity in circadian rhythms of bumble-bee queens

Maternity-related plasticity in circadian rhythms of bumble-bee queens

Sleep and Development in Genetically Tractable Model Organisms

Consequences of sleep deprivation

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