Ecology and neurophysiology of sleep in two wild sloth species

Details

Serval ID
serval:BIB_0515767C064E
Type
Article: article from journal or magazin.
Collection
Publications
Title
Ecology and neurophysiology of sleep in two wild sloth species
Journal
Sleep
Author(s)
Voirin B, Scriba M.F., Martinez-Gonzalez D, Vyssotski A.L., Wikelski M., Rattenborg N.C.
ISSN
0161-8105
Publication state
Published
Issued date
2014
Peer-reviewed
Oui
Volume
37
Number
4
Pages
753-761
Language
english
Abstract
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.
Keywords
predation, REM sleep, non-REM sleep, sloth, benzodiazepine, spindle, wild, EEG, phasing
Web of science
Open Access
Yes
Create date
28/11/2013 12:38
Last modification date
20/08/2019 13:26
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