研究所对一条河流生态系统进行了几年的跟踪调查�现某种鱼迁入此生态系统后的种群数量增长率随时间的变化�现如下图所示曲线则在t1时该种群的年龄 Template




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tomski研究所对一条河流生态系统进行了几年的跟踪调查�现某种鱼迁入此生态系统后的种群数量增长率随时间的变化�现如下图所示曲线则在t1时该种群的年龄 coloring