Ecology and neurophysiology of sleep in two wild sloth species

Détails

ID Serval
serval:BIB_0515767C064E
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Ecology and neurophysiology of sleep in two wild sloth species
Périodique
Sleep
Auteur(s)
Voirin B, Scriba M.F., Martinez-Gonzalez D, Vyssotski A.L., Wikelski M., Rattenborg N.C.
ISSN
0161-8105
Statut éditorial
Publié
Date de publication
2014
Peer-reviewed
Oui
Volume
37
Numéro
4
Pages
753-761
Langue
anglais
Résumé
Study Objectives: Interspecific variation in sleep measured in captivity correlates with various physiological and environmental factors, including estimates of predation risk in the wild. However, it remains unclear whether prior comparative studies have been confounded by the captive recording environment. Herein we examine the impact of predation pressure on sleep in sloths living in the wild.
Design: Comparison of two closely related sloth species, one exposed to predation and one free from predation.
Setting: Panamanian mainland rainforest (predators present) and island mangrove (predators absent).
Participants: Mainland (Bradypus variegatus, 5 males and 4 females) and island (Bradypus pygmaeus, 6 males) sloths.
Interventions: None.
Measurements and Results: EEG and EMG activity were recorded using a miniature data logger. Although both species spent between 9 and 10 hours per day sleeping, the mainland sloths showed a preference for sleeping at night, whereas island sloths showed no preference for sleeping during the day or night. EEG activity during NREM sleep showed lower low-frequency power, and increased spindle and higher frequency power in island sloths when compared to mainland sloths.
Conclusions: In sloths sleeping in the wild, predation pressure influenced the timing of sleep, but not the amount of time spent asleep. The preference for sleeping at night in mainland sloths may be a strategy to avoid detection by nocturnal cats. The pronounced differences in the NREM sleep EEG spectrum remain unexplained, but might be related to genetic or environmental factors.
Mots-clé
predation, REM sleep, non-REM sleep, sloth, benzodiazepine, spindle, wild, EEG, phasing
Web of science
Open Access
Oui
Création de la notice
28/11/2013 12:38
Dernière modification de la notice
20/08/2019 13:26
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