INVESTIGADORES
KEMBRO Jackelyn Melissa
congresos y reuniones científicas
Título:
The Fractal organization of ultradian rhythms in avian behavior
Autor/es:
GUZMÁN, D.A.; ANA GEORGINA FLESIA; ANA GEORGINA FLESIA; PELLEGRINI, S.; MARIN, RAUL HECTOR; KEMBRO, J.M.
Lugar:
Plougan
Reunión:
Simposio; Xth European Symposium on Poultry Welfare; 2017
Institución organizadora:
World's Poultry Science Association
Resumen:
The temporal organisation of biochemical and physiological processes involved inanimal behavior, such as hormonal secretion, sleep, and locomotion, has evolvedperiodicities that match the external world (i.e. circadian day/night cycles, orcircannual seasonal cycles), and endogenous spontaneous patterns that can becomplex and non-periodic. A large body of evidence indicates that some behavioral processes (e.g. locomotor activity, swimming patterns, social behavior) exhibit robust scale-invariant fractal patterns and long-range temporal correlations. By definition, fractals are composed of parts that at different magnification scales resemble the whole, i.e. they are self-similar. This self-similarity trait, when applied to time series, renders fractal temporal fluctuations across multiple time scales. Hence, animal behavior displays both periodic rhythms and fractal dynamics yet the relationship between these two dynamic regimens remains unexplored. Herein we studied locomotor time series of visually-isolated Japanese quails sampled every 0.5s during 6.5 days (>1 million data points). These high-resolution, week-long, time series allow simultaneous evaluation of ultradian rhythms as well as fractal organisation. Irrespective of visual isolation, all animals exhibited synchronized ultradian rhythms. Wavelet analysis of time series showed that all birds exhibit the same circadian and ultradian behavioral rhythms (12, 8, 6, 4.8, 4h and lower). In addition, all birds presented a similar overall fractal dynamics (for time scales between 30s to >4.4h). This is the first demonstration that avian behavior presents fractal organisation that predominates at shorter time scales and coexists with synchronised ultradian rhythms. This chronobiological pattern is advantageous for keeping the organism?s endogenous rhythms in phase with internal and environmental periodicities, notably the feeding, light-dark and sleep-wake cycles.Moreover, the novel approach, based on wavelet analysis, presented herein fordetecting ultradian rhythms as well as assesing rhythm syncronization betweenanimals are useful tools for assesing potential effects of stressors on animalphysiology/behavior.