Ying Zhixia, Liao Jinbao, Wang Shichang, Lu Hui, Liu Yongjie, Ma Liang, Li Zhenqing
State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Research Group of Plant and Vegetation Ecology, Department of Biology, University of Antwerp (Campus Drie Eiken), Universiteitsplein 1, B-2610 Wilrijk, Belgium.
J Theor Biol. 2014 Oct 21;359:184-91. doi: 10.1016/j.jtbi.2014.05.048. Epub 2014 Jun 14.
Opinions differ on how the spatial distribution of species over space affects species coexistence. Here, we constructed both mean-field and pair approximation (PA) models to explore the effects of interspecific and intraspecific interactions and dispersal modes on species coexistence. We found that spatial structure resulting from species dispersal traits and neighboring interactions in PA model did not promote coexistence if two species had the same traits, though it might intensify the contact frequency of intraspecific competition. If two species adopt different dispersal modes, the spatial structure in PA would make the coexistence or founder control less likely since it alters the species effective birth rate. This suggests that the spatial distribution caused by neighboring interactions and local dispersal does not affect species coexistence unless it adequately alters the effective birth rate for two species. Besides, we modeled how the initial densities and patterns affected population dynamics and revealed how the final spatial pattern was generated.
关于物种在空间上的分布如何影响物种共存，存在不同观点。在此，我们构建了平均场模型和对近似（PA）模型，以探究种间和种内相互作用以及扩散模式对物种共存的影响。我们发现，如果两个物种具有相同的特征，PA模型中由物种扩散特征和邻域相互作用产生的空间结构不会促进共存，尽管它可能会加剧种内竞争的接触频率。如果两个物种采用不同的扩散模式，PA中的空间结构会使共存或奠基者控制的可能性降低，因为它改变了物种的有效出生率。这表明，除非邻域相互作用和局部扩散引起的空间分布充分改变两个物种的有效出生率，否则不会影响物种共存。此外，我们模拟了初始密度和格局如何影响种群动态，并揭示了最终空间格局是如何产生的。
