右图表示某鼠群迁入一个有利于繁殖的生存环境后的数量增长曲线。

右图表示某鼠群迁入一个有利于繁殖的生存环境后的数量增长曲线。请据图回答下列问题。

(1)该图表示鼠增长的“________”型曲线。

(2)这个鼠群繁殖速度最快在________点左右。

(3)鼠群繁殖开始受到限制在________点左右。

(4)鼠群数量最大值(K)________点,最小值在________点。

(5)DE段较BD段增长率下降的原因是_____________________________________

_______________________________________________________________

答案

 (1)S (2)D (3)E (4)F C (5)当鼠群在一个有限的环境中增长时,随着种群密度的上升,个体间对有限空间、食物和其他生活条件的种内斗争必将加剧,以鼠为食的捕食者的数量也会增加,这就会使鼠的出生率小于死亡率,从而使鼠群数量的增长率下降

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