Summary

We studied dive patterns of northern elephant seals, that consisted of measurements of time vs. depth, by applying several time series based techniques. A primary feature of these patterns is diel variation in dive duration and maximal dive depth. Time series analysis of this variation over a two mo...

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Bibliographic Details
Main Authors: David R. Brillinger, Brent S. Stewart
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.136.1740
http://www.stat.berkeley.edu/~brill/Papers/rebrape.pdf
Description
Summary:We studied dive patterns of northern elephant seals, that consisted of measurements of time vs. depth, by applying several time series based techniques. A primary feature of these patterns is diel variation in dive duration and maximal dive depth. Time series analysis of this variation over a two month period of continuous diving revealed an apparent cir-cadian rhythm. The consistency of this rhythm despite large scale geo-graphic movement during migration may suggest that the pattern is endogenous or that environmental (biotic and abiotic) factors are sufficiently similar over large ocean areas in the eastern North Pacific to- 2-result in these consistent circadian foraging behaviors. A model involving stochastically elicited impulse responses is proposed.