·2,447,543篇论文数据，部分数据来源于NoteExpress
The effect of crowding and physiological stress and shortage of food resources were the main reasons for the decline of population natality and yearly increase rate.
种群密度过高产生的拥挤效应和食物资源不足是造成种群出生率和年度增长率下降的主要原因。
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