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Am J Physiol Heart Circ Physiol 276: H844-H857, 1999;
0363-6135/99 $5.00
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Vol. 276, Issue 3, H844-H857, March 1999

Heart rate and behavior of fur seals: implications for measurement of field energetics

I. L. Boyd1, R. M. Bevan2, A. J. Woakes2, and P. J. Butler2

1 British Antarctic Survey, Cambridge CB3 OET; and 2 School of Biological Science, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom

Archival data loggers were used to collect information about depth, swimming speed, and heart rate in 23 free-ranging antarctic fur seals. Deployments averaged 9.6 ± 5.6 days (SD) and totaled 191 days of recording. Heart rate averaged 108.7 ± 17.7 beats/min (SD) but varied from 83 to 145 beats/min among animals. Morphometrics explained most variations in heart rate among animals. These interacted with diving activity and swimming speed to produce a complex relationship between heart rate and activity patterns. Heart rate was also correlated with behavior over time lags of several hours. There was significant (P < 0.05) variation among animals in the degree of diving bradycardia. On average, heart rate declined from 100-130 beats/min before the dive to 70-100 beats/min during submersion. On the basis of the relationship between heart rate and rate of oxygen consumption, the overall metabolic rate was 5.46 ± 1.61 W/kg (SD). Energy expenditure appears to be allocated to different activities within the metabolic scope of individual animals. This highlights the possibility that some activities can be mutually exclusive of one another.

diving; Antarctica; metabolic rate; respirometry; morphometrics


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