Effects of competition on natal dispersal distance.

Abstract

Effects of competition on natal dispersal distances are examined by extending a recent model to consider any type of search path, mortality during dispersal, and a model that is intermediate between sequential and simultaneous dispersal. Sequential dispersal occurs where an individual disperses only after the preceeding disperser has settled. Simultaneous dispersal occurs where dispersers compete for vacancies at the same time. The search path used by a dispersing individual will influence the natal dispersal distance, but will have little effect on the overall relationship between competition and dispersal distance. Mortality during dispersal may have a strong effect on this relationship. The simultaneous and sequential dispersal models may be modified to determine the effect of sequentially adding dispersers or vacancies to the competition for territories. Increased competition can cause dispersal distances to increase or decrease, depending on the nature and magnitude of competition and on the magnitude of dispersal mortality. Show more