Siberian Federal University

Issue

Journal of Siberian Federal University. Biology. 2012 5 (4)

Authors

Lopatina, Tatiana S.; Zadereev, Egor S.

Contact information

Lopatina, Tatiana S.: Institute of Biophysics SB RAS; Siberian Federal University , 50-50 Akademgorodok, Krasnoyarsk, 660036 Russia; 79 Svobodny, Krasnoyarsk, 660041 Russia; Zadereev, Egor S.: Institute of Biophysics SB RAS; Siberian Federal University , 50-50 Akademgorodok, Krasnoyarsk, 660036 Russia; 79 Svobodny, Krasnoyarsk, 660041 Russia , e-mail:

Keywords

cladocerans; food concentration; maternal effect; resting eggs; species coexistence

Abstract

The study addresses the effect of different food concentrations of green alga Chlorella vulgaris on the life cycle parameters (the body length, specific juvenile somatic growth rate of body length, the number of offspring in the first clutch of parthenogenetic females and the number of females producing resting eggs) of the individually cultivated females of M. brachiata. The lowest food concentration used in the experiment, 100 thousand cells/ml, had a limiting effect on such parameters as the size of females at the first reproduction, juvenile somatic growth rate of body length and fecundity; it also induced the production of resting eggs by females. With food concentration increase, the size of females at the first reproduction, their somatic growth rate of body length and fecundity also increased, and the number of females that produced resting eggs decreased. Under maximal food concentrations (400 and 800 thousand cells/ml) the size of females at the first reproduction, the somatic growth rates of body length and the number of hatched offspring were the largest, and there were no females producing ephippial eggs. We also tested the effect of food concentration under which the maternal generation was kept on the ability of the offspring generation to produce resting eggs. The production of resting eggs failed to occur only at the highest food concentrations for maternal females and their offspring (400 thousand cells/ml). Thus, we concluded that food concentration above 400 thousand cells/ml is favorable concentration for parthenogenetic reproduction of M. brachiata. Since there are no literature data on what food concentration induces the production of resting eggs for this species, the results define the trophic conditions that induce production of resting eggs in M. brachiata.

Pages

427-438

Paper at repository of SibFU

https://elib.sfu-kras.ru/handle/2311/9557

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).