問題詳情
5．某农场面积为140hm2，农场丰富的植物资源为黑线姬鼠提供了很好的生存条件，鼠大量繁殖吸引鹰来捕食，某研究小组采用标志重捕法来研究黑线姬鼠的种群密度，第一次捕获100只，标记后全部放掉，第二次捕获280只，发现其中有两只带有标记，下列叙述错误的是（ ）
(A)鹰的迁入率增加会影响黑线姬鼠的种群密度
(B)该农场黑线姬鼠的种群密度约为100只/hm
(C)黑线姬鼠种群数量下降说明农场群落的丰富度下降
(D)植物→鼠→鹰这条食物链，第三营养级含能量少
(A)鹰的迁入率增加会影响黑线姬鼠的种群密度
(B)该农场黑线姬鼠的种群密度约为100只/hm
(C)黑线姬鼠种群数量下降说明农场群落的丰富度下降
(D)植物→鼠→鹰这条食物链，第三营养级含能量少
參考答案
答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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