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SUMMARY:Strong Anomalous Diffusion for Free-ranging Birds - Ohad Vilk (Heb
 rew University of Jerusalem)
DTSTART:20250911T145000Z
DTEND:20250911T145500Z
UID:TALK233362@talks.cam.ac.uk
DESCRIPTION:Diffusion and anomalous diffusion are widely observed and used
  to study movement across organisms\, resulting in extensive use of the me
 an and mean-squared displacement (MSD). However\, these measures -- corres
 ponding to specific displacement moments -- do not capture the full comple
 xity of movement behavior. Using high-resolution data from over 70 million
  localizations of young and adult free-ranging Barn Owls (\\textit{Tyto al
 ba})\, we reveal strong anomalous diffusion as nonlinear growth of displac
 ement moments. The moment spectrum function $\\lambda_t(q)$ -- defined by 
 $\\left<|\\bm{x}(t)|^q\\right> \\sim t^{\\lambda_t(q)}$ -- displays piecew
 ise linearity in $q$\, with a critical moment marking the crossover betwee
 n scaling regimes. This highlights the need of a broad spectrum of displac
 ement moments to characterize movement\, which we link to age-specific eco
 logical drivers. Furthermore\, a characteristic timescale of five minutes 
 marks an unexpected transition from a convex to a concave $\\lambda_t(q)$.
  Using two stochastic models -- a bounded L&eacute\;vy walk and a multi-mo
 de behavioral model -- we account for the observed phenomena\, showing goo
 d agreement with data\, relating age-specific behavioral states to environ
 mentally confined movement\, and demonstrating how L&eacute\;vy walk-like 
 patterns can arise from underlying behavioral structure. Finally\, we disc
 uss the ecological significance of our results\, arguing that strong anoma
 lous diffusion may be widespread in animal movement.&nbsp\;
LOCATION:External
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