Differential foraging preferences on seed size by rodents result in higher dispersal success of medium-sized seeds.

摘要: Rodent preference for scatter-hoarding large seeds has been widely considered to favor the evolution of seeds. Previous studies supporting this conclusion were primarily based on observations at earlier stages seed dispersal, or a limited sample successfully established seedlings. Because dispersal comprises multiple stages, we hypothesized that differential foraging size by animal dispersers different would ultimately result in medium-sized having highest success rates. In study, tracking number 5 yr, investigated effects fates from removal seedling establishment dominant plant Pittosporopsis kerrii (Icacinaceae) dispersed rodents tropical forest southwest China. We found small had lower survival rate early stage where more predated stations and after removal; late stage, recovered, being cached, larder-hoarded. Medium-sized experienced success. Our study suggests preferences could conflicting selective pressures higher