The cardiorespiratory, metabolic, and thermoregulatory physiology of juvenile northern elephant seals (mirounga angustirostris) ...
Heart rates, respiratory frequencies, field metabolic rates (FMR) and body temperatures of northern elephant seals diving at sea and during apnoea on land were monitored to gain insight into the ability of elephant seals to make repetitive, long duration dives. Juvenile northern elephant seals were...
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| Format: | Text |
| Language: | English |
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University of British Columbia
2009
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| Online Access: | https://dx.doi.org/10.14288/1.0089254 https://doi.library.ubc.ca/10.14288/1.0089254 |
| Summary: | Heart rates, respiratory frequencies, field metabolic rates (FMR) and body temperatures of northern elephant seals diving at sea and during apnoea on land were monitored to gain insight into the ability of elephant seals to make repetitive, long duration dives. Juvenile northern elephant seals were captured at Afio Nuevo, CA, instrumented, and translocated to release sites around Monterey Bay. Data were recorded with custom data loggers and analogue Holter monitors during the seals' return to Ano Nuevo and during apnoea and eupnoea on land after they hauled out on the beach. Diving patterns were very similar to those of naturally migrating juveniles. The heart rate response to apnoea at sea and on land was a prompt bradycardia, but only at sea was there an anticipatory tachycardia before breathing commenced. Heart rate at sea declined by 64% from the surface rate of 107±3 beats min⁻¹ (mean ± SD) while heart rate on land declined by 31% from the eupnoeic rate of 65±8 beats min⁻¹. Diving heart rate was ... |
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