Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Clarkia xantiana ssp. xantiana Soil biotic interaction fragmentación fragmentation geographic range limit graph theory grasslands local adaptation modelos de redes network models pastizales plant-soil feedbacks population size reciprocal transplant redes ponderadas species distributions tamaño poblacional teoría de gráficos weighted networks 加权网络 图论 破碎化 种群大小 网络模型 草地