物种平衡(species equilibrium) 在一隔离的生物地理区域内,由于现存物种和新物种之间的竞争作用,单位时期内新种移入的种数和现存种的绝灭种数将趋于平衡,此一生物区内物种种数始终保持平衡。 物种平衡是决定隔离地区物种种数的重要因子,这种平衡点还取决于该隔离地区的面积和新移入种的距离等,根据种种因子互相作用的数学分析,可以预测隔离地区物种的流动速度。
植物平衡了生态系统、保护了流域、减缓了侵蚀、缓和了气候,为许多动物物种提供了庇护所。
Plant life balances ecosystems, protects watersheds, mitigates erosion, moderates climate and provides shelter for many animal species.
在一种意义上,确实可以认为生态系统是平衡与和谐的,组成生态系统的物种相互依赖。
There really is a sense in which ecosystems are balanced and harmonious, with some of their constituent species becoming mutually dependent.
但是华盛顿州立大学的昆虫生态学家克劳德的研究显示平衡的重要性——各种物种相对充盈。
But the research by Crowder, an insect ecologist at Washington State University in Pullman, and his colleagues, shows the importance of 'evenness' - the relative abundance of different species.
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