Developmental stability and enzyme heterozygosity in rainbow trout
Developmental stability and enzyme heterozygosity in rainbow trout
复制标题
虹鳟鱼的发育稳定性和酶杂合性
作者：
R. Leary;F. Allendorf;K. L. Knudsen
生物体的发育途径是通过遗传调整来产生物种的特征形态，而不管发育过程中内部和外部条件的变化。然而，这种“发展缓冲”并不总是精确的。生物体的两侧特征通常是不对称的，即大小、形状或数量不同。波动不对称发生在个体左右两侧的字符之间的差异正态分布在0 - 1的平均值附近时。这种类型的不对称性的结果从一个有机体的能力，以发展精确沿着确定的paths 1，2，并可用作发展stability 1，3-5的措施。发育稳定性的增加将通过波动的不对称性的减少来反映。我们现在已经研究了虹鳟鱼（萨尔莫gairdneri）种群中5个双边性状的波动不对称性与13个多态位点的杂合度之间的关系。我们的研究结果表明，杂合位点的比例和不对称性状的比例之间存在显着的负相关。这些数据提供的证据表明，在一个群体中具有更大杂合性的个体具有更高的发育稳定性。
The developmental pathways of organisms are genetically adjusted to produce the characteristic morphology of the species regardless of variations in internal and external conditions during development. This ‘developmental buffering’, however, is not always precise. Bilateral characters of an organism are often asymmetric, that is, different in size, shape or number. Fluctuating asymmetry occurs when the difference between a character on the left and right sides of individuals is normally distributed about a mean of zero1. This type of asymmetry results from the inability of an organism to develop precisely along determined paths1,2 and can be used as a measure of developmental stability1,3–5. Increased developmental stability would be reflected by reduced amounts of fluctuating asymmetry. We have now examined the relationship between the amount of fluctuating asymmetry for five bilateral characters and heterozygosity at 13 polymorphic loci in a population of rainbow trout (Salmo gairdneri). Our results indicate a significant negative correlation between the proportion of heterozygous loci and the proportion of asymmetric characters. These data provide evidence that individuals with greater heterozygosity within a population have increased developmental stability.