Journal
CONTEMPORARY PROBLEMS OF ECOLOGY
Volume 3, Issue 1, Pages 28-40Publisher
SPRINGER
DOI: 10.1134/S1995425510010066
Keywords
Daphnia galeala; ontogeny; morphological variation; body shape
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Despite many ecological Studies the population morphological variability within the freshwater crustacean genus Daphnia is poorly investigated, especially during postembryonic development. Unusual phenotypic plasticity of some Daphnia species results in tremendous difficulties in morphological species delineation. The ontogenetic morphological variation of this species, was Studied, revealing the general trends in body turned out body shape variation in different populations. The morphotypes of size and age groups of D. to be more variable at the Mouth of the Kargat River (Lake Chany basin) than in Lake Todzha (Bol'shoi Yenisei River basin); however, the growth of characters such as the helmet and tall spine was described by an allometric function and their absolute sizes decreased with age in Daphnia from both water basins. It is shown that the first mature size-and-age group of D. galeata is Most Suitable for investigating Population morphological variation.
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