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Squared Net Displacement as indicator of migratory state

I saw a talk that used this simple measure to quantify moose migration, then used non-linear mixed effect models to characterize the distance, timing, and duration of the migrations. I missed some of the segmentation discussions - was this method considered? Its more simplistic than some other options, but seems relatively robust to scale and sample interval. See attached for some raptor migration data I played with a bit today. - Roland

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limitations

As David pointed out, squared net displacement is limited to animals with fairly simple out/back migrations. It would probably not be useful for more circuitous routes, and I'm not sure how well it would highlight stop-overs. The advantage is that its easy to run in R and helps view these drastic changes in behavior.