Fur Seal Analysis

Revision as of 11:11, 3 April 2008

Preliminary draft of manuscript

The following: Gurarie2008 MovementAnalysis is a preliminary draft of a paper on the analysis methods for generating a behaviorally "distilled" model of animal movement. It is missing any discussion of the application of the method to the fur seal movements.

Plots of all fur seals

This file: FurSealAllPlots.pdf contains plots of five Northern fur seal tracks and analysis according to the Gurarie-2008 method.

The data are from fur seal number NFS07-03, and include trips 1, 2, 3, 4 and 7, which were long enough for a complete analysis.

The plots on the left show the time-series of velocity and turning angles decomposed into persistence (V_p = Vcos(θ)) and turning (V_t = Vsin(θ)) components. The decompositions were performed using a window size L of 30 and 50 data points.

The black line is the estimate for the mean , the red line represents the estimate for the standard deviaion , and the color reflects the auto-correlation : bluer colors indicate less auto-correlated movement, while yellow colors indicate more auto-correlated movement. Vertical orange lines indicate points where the estimation routine suggests there was a significant behavioral shift. Thicker lines correspond to a higher number of selected shifts. Grey bands indicate nighttime.

To the right, I present a mapping of the track itself. Colors again indicate the auto-correlation estimate for the persistence component (V_p), while the size of the dots indicates the estimated velocity at each point.

There is (in my view) lots of things to think about here!

Eli 14:44, 2 April 2008 (PDT)