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"Cortes, Jose Francis"

 
 
 Holguin-Medina, Victoria Eugenia; Fontenele-Araujo, John; Romero, Víctor Manuel Alcaraz; Cortes, Jose Francisco; Muñoz-Delgado, Jairo (detail)
   
2015
Circadian and ultradian activity rhythms in manatee (Trichechus manatus manatus) in captivity.
Biological Rhythm Research 46(5): 631-645. 3 tabs. 3 figs. DOI:10.1080/09291016.2015.1046244. Published online May 13, 2015.
–ABSTRACT: In this study, we show temporal organization of activity patterns in larger temporal series recording. The objective of this study was to determine the temporal pattern of the rest-activity rhythm in manatee (T. manatus manatus) in captivity. Activity recordings were programmed from August (2010) to September (2011) with actimetry devices, and behavior recordings were conducted in dry and rainy seasons. We showed that the marine manatee presents a complex temporal organization, in which the activity-rest rhythm comprises several frequencies with a predominant circadian component and multiple ultradian components. Our results indicate that the animals were more active during the day with respect to the night. The temporal organization of this cycle entails multiple frequencies that include ultradian rhythms, which may be expressions generated by physiological needs, like a food availability and thermoregulatory requirements. These patterns should be taken into consideration for future studies of biological rhythms in manatee.
Daryl P. Domning, Research Associate, Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560, and Laboratory of Evolutionary Biology, Department of Anatomy, College of Medicine, Howard University, Washington, D.C. 20059.
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