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In a recent article Caley (1991) outlined a null model for dispersal distributions
against which he suggested empirical data should be compared. He first presented
Waser's geometric model (Waser 1985), which can be derived as follows: Dispersing
individuals move in a straight line from the natal site and settle in the first
unoccupied site they encounter. If unoccupied sites occur independently at random
with probability t as a result of turnover within the habitat, then the distribution
of dispersal distances will follow a geometric distribution in which the probability
of settling at distance i is given by
p(i) = t(l - t)' for i = 0, 1,2,3,. . .
continues.
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