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

ISSN Print: 1521-9429
ISSN Online: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v13.i3.60
pages 277-288

The Growth of New Species in the Black Sea: Chaetoceros throndsenii (Marino, Montresor & Zingone) Marino, Montresor & Zingone in Natural and Experimental Conditions

L. A. Pautova
P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences,36, Nakhimovskiy St., 117997 Moscow, Russia
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
A. S. Mikaelyan
P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences,36, Nakhimovskiy St., 117997 Moscow, Russia
T. A. Lukashova
Southern Branch of P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Gelendzhik-7, 353467 Krasnodar Region, Russia

ABSTRACT

In May−June 2005 in the northeastern Black Sea, on its shelf, slope, and in the open sea, intensive (up to 1.92×105 cells/L) growth of alien species, Chaetoceros throndsenii, in the Black Sea was observed. At the same time, a mass development of coccolithophore Emiliania huxleyi (Lohmann) Hay et Mohler took place, cell numbers of which reached the level of blooms. The experimental studies of natural phytoplankton community have shown that the synchronous nitrogen and phosphorus supply promoted intensive growth of Ch. throndsenii. A complete removal of this species’ cells in the continuous (chemostat) culture took place when a dilution rate was 0.25 day−1. When the dilution rate was 0.15 day−1 short-term (7 days) coexistence of Ch. throndsenii and Pseudonitzschia pseudodelicatissima (Hasle) Hasle was observed. The maximal growth rate of new species in continuous culture was recorded during the first three days at was 1.4 day−1. A maximal cell degradation of Ch. throndsenii (0.5 day−1) was recorded in the last phase of the bath culture with the synchronous nitrogen and phosphorus supply. A low rate of water exchange in the surface mixed layer (< 0.15 day−1), stable stratification and relatively small nitrogen and phosphorus concentrations are necessary for appearance and long existence of this alien species in the Black Sea.