Repeatability of circadian behavioural variation revealed in free-ranging marine fish

Repeatability of circadian behavioural variation revealed in free-ranging marine fish

Repeatable between-individual differences in the behavioural manifestation of underlying circadian rhythms determine chronotypes in humans and terrestrial animals. Here, we have repeatedly measured three circadian behaviours, awakening time, rest onset and rest duration, in the free-ranging pearly razorfish, Xyrithchys novacula, facilitated by acoustic tracking technology and hidden Markov mode...

Behavioural and kinematic components of the fast-start escape response in fish: individual variation and temporal repeatability.

Inter-individual variation in physiological performance traits, which is stable over time, can be of potential ecological and evolutionary significance. The fish escape response is interesting in this regard because it is a performance trait for which inter-individual variation may determine individual survival. The temporal stability of such variation is, however, largely unexplored. We quanti...

Body Temperature Variation in Free-Ranging Hognose Snakes (Heterodon platirhinos)

—Body temperatures (Tb) of eight free-ranging Heterodon platirhinos were measured with radiotelemetry throughout the year. Body temperature ranged from 5–37uC and varied with air temperature and activity. During the active season, Tb of active snakes (,30.5uC) averaged about 3uC higher than that of inactive snakes (,27.4uC). Body temperature did not differ between the sexes or between resident ...

Survey of Specific Fish Pathogens in Free-Ranging Fish from Devils Lake, North Dakota

Circadian variation in onset of stroke in a university Hospital in Babol, North of Iran

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