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SUMMARY:Ergodicity Breaking in Area-Restricted Search of Avian Predators -
  Michael Assaf (Hebrew University of Jerusalem)
DTSTART:20230913T081500Z
DTEND:20230913T090000Z
UID:TALK203374@talks.cam.ac.uk
DESCRIPTION:Quantifying and comparing patterns of dynamical ecological sys
 tems requires averaging over measurable quantities. For example\, to infer
  variation in movement and behavior\, metrics such as step length and velo
 city are averaged over large ensembles. Yet\, in nonergodic systems\, such
  averaging is inconsistent\; thus\, identifying ergodicity breaking is ess
 ential in ecology. Using rich\, high-resolution\, movement data sets (grea
 ter than 7 &times\; 107 localizations) from 70 individuals and continuous-
 time random walk modeling\, we find subdiffusive behavior and ergodicity b
 reaking in the localized movement of three species of avian predators. Sma
 ll-scale\, within-patch movement was found to be qualitatively different\,
  not inferrable and separated from large-scale interpatch movement. Local 
 search is characterized by long\, power-law-distributed waiting times with
  a diverging mean\, giving rise to ergodicity breaking in the form of cons
 iderable variability uniquely observed at this scale. This implies that wi
 ld animal movement is scale specific\, with no typical waiting time at the
  local scale.
LOCATION:Seminar Room 1\, Newton Institute
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