... effective nuclear charge 有效核电荷 effective population size 有效群体大小，有效种群大小 effective quantum number 有效量子数 ...
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genetically effective population size 遗传有效种群大小
mean effective population size 平均有效种群大小
effective population size ne 有效繁殖群体数
population effective size 群体有效含量
effective size of population 群体的有效大小
以上来源于: WordNet
Effective population size and breeders selection manners affect the effect of breeds conservation.
群体有效大小和留种方式影响保种的效果。
That number is smaller than current figures for the effective population size (or number of breeding individuals) for endangered species such as chimpanzees (21, 000) and gorillas (25, 000).
当时的人数甚至不及现在濒临灭绝的黑猩猩（21000头）和大猩猩（25000头）的有效种群大小（即能生育的个体数量）。
Some technical measures were used in the breed control of Hequ horse, such matters as defining conservation region, determining effective population size and having a right foundation herd etc.
河曲马品种的保种与选育，应采取划定保护区，建立育种核心群，确定群体有效含量，控制近交，调整马群结构和合适的公母比例等措施；
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