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Variation in stomach temperature as indicator of meal size in harbour seal, Phoca vitulina

Bekkby, Trine; Bjørge, Arne
Working paper
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CM_1995_N_12.pdf (442.1Kb)
URI
http://hdl.handle.net/11250/105479
Date
1995
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  • ICES CM documents authored by IMR scientists (1949-2011) [3138]
Original version
This report is not to be cited without prior reference to the authors  
Abstract
To understand the role of the marine mammals as components in foodwebs, it is important to know the composition

frequency and size of their meals. Marine mammals have a core body temperature of about 37°C, and feed mainly on poikilothennic

animals. Food intake will therefor lead to a coating of the stomach, followed by an increased metabolism. Up till now there has been no

direct method for measuring the amount of food ingested by free ranging animals. Here we describe the use of a method for remote

registration of changes in stomach temperature to quantify meal sizes in captive harbour seals (Phoca vitulina). This might serve as a

calibration of technology that may also be applied to free ranging seals. The animals were fed a range of meal sizes at various temperatures

and individual fish sizes. The time taken to regain initial stomach temperature from minimum temperature (recovery time) was significantly

related to both meal size and meal temperature. The time taken from initial temperature to initial temperature again was regained (total time)

was also significantly related to both meal size and meal temperature. Recovery time is in this experiment considered the best available

indicator of meal size when meal temperature is known.
Publisher
ICES
Series
ICES CM Documents;1995/N:12

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