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SUMMARY:Revisiting Levy flight search patterns of wandering albatrosses\, 
 bumblebees and deer - Andrew Edwards\, British Antarctic Survey
DTSTART:20070731T100000Z
DTEND:20070731T110000Z
UID:TALK7717@talks.cam.ac.uk
CONTACT:Ryan Woodard
DESCRIPTION:A decade ago a it was concluded that wandering albatrosses (Di
 omedea exulans) perform 'Levy flights' when searching for prey on the ocea
 n surface -- a Levy flight is a special kind of random walk that displays\
 nfractal properties. The well-known albatross study motivated substantial 
 theoretical work suggesting that a Levy flight might be an optimal foragin
 g strategy. Analysis of further data has concluded Levy-flight\nmovement p
 atterns by a range of organisms\, including deer\, bumblebees\, reindeer\,
  microzooplankton\, grey seals\, spider monkeys and fishermen. In this tal
 k I will present: (i) an analysis of newer wandering albatross data\; (ii)
  a re-analysis of the albatross data from the original study\; (iii) a re-
 analysis of the aforementioned deer and bumblebee data sets\n(using likeli
 hood and Akaike weights). Surprisingly\, none of these data sets in fact s
 how evidence for Levy flights\, in contrast to what was previously thought
 . Furthermore\, the graphical approach widely adopted\nto conclude Levy fl
 ight movement is problematic. This raises questions as to the strength of 
 the empirical evidence for Levy flights by foraging animals.\n
LOCATION:British Antarctic Survey\, Room 330B
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