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International Journal on Algae
SJR: 0.219 SNIP: 0.261 CiteScore™: 0.24

ISSN Imprimir: 1521-9429
ISSN On-line: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v6.i4.70
pages 390-404

Dynamics of productional and morphometric indexes of Gracilaria thalli in the culture

V. A. Silkin
Southern Branch of the P.P. Shirshov Inst. of Oceanology, RAS, 353467 Gelendzhik, Krasnodar Region, Russia ; Institute of Cosmic Research, RAS, 84/32, Profsoyuznaya St., 17997Moscow, Russia
N. V. Mironova
Kovalevsky Institute of Biology of the Southern Seas, National Academy of Sciences of Ukraine, 2, Nakhimov Prosp., Sevastopol, 99011, Crimea, Ukraine


Dynamics of productional and morphometric (diameter, length and number of branches of all orders) parameters of the thalli of Gracilaria verrucosa (Huds.) Papenf. was studied at temperatures 18, 23 and 27 °C, and light intensity 30 and 40 W/m2. In 30 days of cultivation the average mass of thallus increased from 0.104 g to 0.45 g of crude biomass. Maximal values of specific speed of growth of the thalli, namely 0.068 and 0.069 days−1, were obtained at temperatures 18 and 23 °C. Growth processes substantially slowed at 27 °C. Temperature of the environment was a factor determining the strategy of morphological organization of thallus. At low temperatures, growth strategy of extensive type was realized through the increase of diameters and length of main axis and branches of 1st and 2nd orders. With rise of temperature growth strategy changed drastically way, namely new branches of the second, third and fourth orders were formed.