In this talk, we consider the single species model with nonlocal dispersal strategy and investigate how the dispersal rate of the species and the distribution of resources affect the total population. First, we show that the upper bound for the ratio between total population and total resource is C\squard{d}. Moreover, examples are constructed to indicate that this upper bound is optimal. Secondly, for a type of simplified nonlocal diffusion operator, we prove that the total population as a function of dispersal rate d admits exactly one local maximum point in (inf m, sup m) under suitable conditions. These results reveal essential discrepancies between local and nonlocal dispersal strategies. This talk is based on a joint work with Fang Li.