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International Journal on Algae
SJR: 0.216 SNIP: 0.322 CiteScore™: 0.4

ISSN Печать: 1521-9429
ISSN Онлайн: 1940-4328

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International Journal on Algae

DOI: 10.1615/InterJAlgae.v5.i3.60
pages 74-84

Epiphytic diatoms of the Black Sea Gracilaria under conditions of its experimental cultivation

L. I. Ryabushko
A.O. Kovalevsky Institute of Biology of the Southern Seas, 2, Nakhimov Ave., Sevastopol 299011, Crimea
N. V. Mironova
Kovalevsky Institute of Biology of the Southern Seas, National Academy of Sciences of Ukraine, 2, Nakhimov Prosp., Sevastopol, 99011, Crimea, Ukraine
B. N. Belyaev
A.O. Kovalevsky Institute of Biology of Southern Seas, National Academy of Sciences of Ukraine, 2. Nakhimov Pr., 335011 Sevastopol, Republic of Crimea, Ukraine

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.

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