Available Food and Crowding as Factors Influencing the Sex of Moina macrocopa. I
Available Food and Crowding as Factors Influencing the Sex of Moina macrocopa. I
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DOI：
10.1086/physzool.4.4.30151162
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发表时间：
1931-10
期刊：
影响因子：
--
通讯作者：
C. A. Stuart;H. J. Cooper;J. Tallman
中科院分区：
文献类型：
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作者：
C. A. Stuart;H. J. Cooper;J. Tallman
在斯图尔特和班塔（1931）以前的一篇论文中指出，在某些实验条件下，在拥挤的裸腹裸腹鱼母亲所产生的雄性数量与饲养母亲的培养基中存在的活细菌数量之间存在一定的比例。在这些实验中，拥挤的裸腹裸腹蚤母亲被培养在用不同量的产气杆菌悬浮液进行细菌化的稀释粪肥注入液的透明纸盘中。这些母体所产雄性的数量与各种培养瓶中存在的活细菌数量非常接近。如果有足够数量的细菌存在，大约每毫升10亿个，母亲只会产生雌性幼崽。随着一系列瓶中细菌数量的减少，产生了雄性，雄性的百分比与培养基中细菌计数的减少成正比。在几个实验中，滤液中的细菌数量减少到裸腹裸腹藻母亲产生
I N A previous paper by Stuart and Banta (1931) it was shown that under certain experimental conditions a definite ratio existed between the number of males produced by crowded Moina mothers and the number of viable bacteria present in the medium in which the mothers were reared. In these experiments crowded Moina mothers were cultured in clear, paper filtrates of dilute manure infusions bacterized with varying amounts of a suspension of A ~robacter ai3rogenes. The number of males produced by these mothers paralleled very closely the number of viable bacteria present in the various culture bottles. An adequate number of bacteria being present, approximately one billion per milliliter, mothers produced only female young. As the number of bacteria was decreased in a series of bottles, males were produced, the percentage of males being in direct proportion to the decrease in the bacterial count of the medium. In several experiments the numbers of bacteria in the filtrate were reduced to the point where Moina mothers produced