ANALYSIS OF INDIVIDUAL CHANGES IN HEAT RESISTANCE OF CLONES OF DAPHNIA MAGNA AT INITIAL STAGES OF CULTIV
Mironova A.P.
Institute of cytology RAS, St.Petersburg;
e-mail: antoninamironova@mail.ru
There were studied 30 clones of water fleas by the sign of the organism heat resistance (HR) at the initial stages of the process of cultivation. Ten clones died before the
appearance of offspring in F2; the remaining clones were multiplied successfully and produced subsequent generations. Based on a change in F1
of individual HR level of the clones as compared with ancestors, it was concluded about a disturbance of mechanisms of physiological homeostasis in the population of dead clones.
In the remaining clones, there were a high negative correlation between the initial individual resistance level and its change in F1 and F2 and a
pronounced narrowing of the variability diapason in F1. In this animal group, the significant lability of the resistance individual level was observed as well as its ability
to regulate shift of its resistance, which provides efficient work of the physiological homeostasis mechanisms.
Key words: heat resistance, variability, individual level, homeostasis
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