Circadian rhythms in diving behavior and ventilatory response to asphyxia in canvasback ducks

The American Journal of Physiology
M Woodin, R Stephenson

Abstract

Underwater feeding behavior was measured in 10 captive canvasback ducks (Aythya valisineria) for 12 days under a 12:12-h light-dark photoperiod. Feeding activity exhibited a daily rhythm, with 76% of dives occurring at night. In separate experiments on six of these ducks, a circadian rhythm was observed in the duration of voluntary dives. Dives at night (14.7 +/- 0.7 s) were significantly longer than those during the day (10.7 +/- 0.7 s). These day-night differences in diving behavior were accompanied by day-night differences in respiratory responses to progressive asphyxia. In the same six ducks, ventilation increased exponentially as a function of inspired CO2 concentration during rebreathing in a closed-circuit barometric plethysmograph. The exponential rate constant for inspired ventilation was significantly smaller at night (0.23 +/- 0.02) than during the day (0.26 +/- 0.01). We suggest that intermittent apneic exercise is facilitated by reduced respiratory chemosensitivity and that the respiratory and behavioral control systems are synchronized by the circadian timing system in diving ducks.

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Citations

Nov 25, 2000·Journal of Applied Physiology·T M Jarsky, R Stephenson
Jan 25, 2000·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·R StephensonT M Jarsky
Oct 2, 2001·The Journal of Physiology·R StephensonR L Horner
May 5, 2004·Respiratory Physiology & Neurobiology·Richard Stephenson
Oct 5, 2006·Respiratory Physiology & Neurobiology·Graham A A DoddWilliam K Milsom

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