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

Boyd, I. L.; Bevan, R. M.; Woakes, A. J.; Butler, P. J.. 1999 Heart rate and behaviour of fur seals: implications for measurement of field energetics. American Journal of Physiology, 276 (3). H844-H857.

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Abstract/Summary

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.

Item Type:	Publication - Article
Programmes:	BAS Programmes > Pre 2000 programme
ISSN:	0363-6135/99
Additional Keywords:	diving, Antarctica, metabolic rate, respirometry, morphometrics, fur seals
Date made live:	28 Aug 2013 11:19 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/503038

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