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