MEPS 185:293-296 (1999) - doi:10.3354/meps185293
A new method for the determination of at-sea activity in sea turtles
Sandra Hochscheid*, Rory P. Wilson
ABSTRACT: Interpretation of diving profiles of aquatic animals would be considerably enhanced by additional behavioural information. A new sensor is presented here which records animal movements. This sensor was tested on a captive loggerhead turtle Caretta caretta which showed similar activity patterns to free-living green turtles Chelonia mydas. A computer program with user-selectable options was developed to analyse the data consistently and rapidly. Using our sensor we calculated the total resting time, which differed by less than 5% from the real resting time when the sampling interval was 2 s. The method was additionally tested for different sampling intervals to find out its applicability for field studies.
KEY WORDS: Activity sensor · Sea turtles · At-sea activity · Dive profiles · 3-D compass
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