Abstract
The seasonal dynamics of the phenotypic structure of a natural E. baicalensis Sars population from Southern Baikal was studied from the number of bristles on the 5th and 6th segments of the antenna (BNA), the length of the 5th and 6th segments of the antenna (5LAS and 6LAS), cephalothorax length (CL), and the length of the 5th pair of swimming legs (SLL) in 2001 and 2004. The phenotypic structure in terms of BNA, 5LAS, and 6LAS is characterized by the presence of bimodality and, in terms of CL and SLL, it has a normal distribution. The seasonal dynamics of the arithmetic mean of the whole population is determined by changing the ratio of the number of individuals in classes with low and high values of traits. The increase in the arithmetic mean is accompanied by decreased variability. The effect of temperature parameters on the quantitative morphological traits is discussed.
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