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ISSN Печать: 1521-9429
ISSN Онлайн: 1940-4328
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Epiphytic diatoms of the Black Sea Gracilaria under conditions of its experimental cultivation
Краткое описание
Comparative characteristics (numbers and biomass) of two species of Rhodophyta, namely Gracilaria verrucosa (Huds.) Papenf. and Gracilaria dura (Ag.) J.Ag., and/ also of their microepi-phytes (composition, numbers, and biomass), obtained under natural conditions (Kazachya Bay of the Black Sea) and laboratory conditions (at 18, 22, and 26 °C, at illumination of 3000, 6000, and 9000 lx, at phosphorus concentration of 0.06, 0.18, and 0.3 mg·L-1, and at nitrogen content of 0.3, 1.2, and 2.1 mg·L-1) are presented. Under natural conditions the highest intensity of development of the studied species of Gracilaria was observed in summer and autumn, whereas the highest intensity of development of epiphytic diatoms was observed in early spring. Under laboratory conditions the illumination of 3000 lx was insufficient for the development of macro- and microalgae. Illumination of 6000 and 9000 lx, water temperature of 18 and 22 °C, nitrogen concentration of 2.1 and 0.3 mg·L-1, and phosphorus content of 0.18 and 0.3 mg·L-1 proved most favorable for their development. Distribution of microalgae on the thalli of macrophytes depending on environmental conditions is discussed.