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Should seeds fly or not?

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4 Author(s)

This paper describes some results of our computer simulation concerning ecological competition on the target area of seed dispersal. It is better for any kinds of plants to disperse their seeds as far as possible because it might spread in new frontier earlier than the others. But, it would be better to put the seeds down just at the neighbor position when the environmental condition is stable. From drawing a fitness landscape for distance and area of dispersal through a computer simulation, it was revealed that both of these strategies are locally optimal to gain more reproductive success, and neighboring strategy is the best when the environment is unchanged and uniform. We examined a type of evolutionary process to investigate the effects of three kinds of environmental parameters, scale of disturbance, death-sprout ratio, and geographical granularity of fertility. The population initialized by random parameters converged into either or both of two types of species, far and broad dispersal and neighboring reproduction, For all of three parameters, the expenmental results showed that the probability to converge into dispersal of longer distance becomes greater corresponding to the degree of environmental change in time and space