Before revision:  Here, we introduce to this theory the concept of preemption exploitation and demonstrate that multispecies coexistence is possible when there is a tradeoff between resource use efficiency and preemption ability. Moreover, our model predicts a transition from efficiency dominated communities to preemption dominated communities with increasing resource availability . This new theory unifies URLanism-specific mechanisms and tradeoffs into a single general tradeoff between preemption and efficiency that provides a mean of coexistence under resource competition .
After revision:  Here, we introduce to this theory the concept of preemption exploitation and demonstrate that multispecies coexistence is possible when there is a tradeoff between the ability to preempt the resource and R. Within the coexistence region, the relative abundance of the preemptor species increases as the difference in Rs decreases and as resource availability increases. Our results highlight the tradeoff between preemption and efficiency that provides a mean of coexistence under resource competition .