Temperature‐mediated seasonal variation in phosphoglucomutase allozyme frequency in the yellow dung fly, Scathophaga stercoraria
Temperature‐mediated seasonal variation in phosphoglucomutase allozyme frequency in the yellow dung fly, Scathophaga stercoraria
复制标题
温度介导的黄粪蝇磷酸葡萄糖变位酶同种酶频率的季节性变化，Scatophaga stercoraria
作者：
Paul I. Ward;P. Jann;W. Blanckenhorn
同种酶的遗传变异与多种形态、生理和适应性相关性状有关。特别是温度可以通过影响酶的功能来影响昆虫的适合度。研究了一个黄粪蝇种群（粪蛉；双翅目：粪蛉科）磷酸糖脲酶（PGM）位点的季节性（12天/年）和日性（每天9个样本/年）等位酶变异。PGM在为飞行动员糖原储备方面具有重要的核心功能，并且在实验室中已被证明在不同温度下影响幼虫的生长。基于3000多只苍蝇的样本，我们发现最常见等位基因的频率与温度之间存在二次关系，在~12°C时最小，主要由季节温度变化介导。这可能是由短期的行为反应引起的，但在一年中，可能是可变生存能力或性选择在这个位点上起作用，维持了现有的多态性。这些结果需要进一步研究PGM等位酶基因型之间的功能差异。
The allozyme genetic variability of various species is correlated with a variety of morphological, physiological and fitness‐related traits. In particular, temperature can affect the fitness of insects through its influence on enzyme function. We examined the seasonal (12 days over 1 year) and daily (nine samples over each day) allozyme variation at the phosphoglucomutase (PGM) locus in one population of yellow dung flies (Scathophaga stercoraria; Diptera: Scathophagidae). PGM is of central functional importance in the mobilization of glycogen reserves for flight, and has been shown to affect larval growth at different temperatures in the laboratory. Based on a sample of over 3000 flies, we found a quadratic relationship, with a minimum at ~12 °C, between the frequency of the most common allele and temperature, primarily mediated by seasonal temperature variation. This could be caused by behavioural responses over the short‐term, but over the year either variable viability or sexual selection probably operates on this locus, maintaining the existing polymorphism. These results call for further work on the functional differences between PGM allozyme genotypes.