(Table 1) Parameters of the upper mixed layer of the Black Sea in October 1992

Species composition and spatial distribution of heterotrophic algae were studied in the Black Sea in autumn 1992. Total phytoplankton biomass varied during that period from 8 to 30 g/m**2. Autotrophic species Ceratium fusus and Rhizosolenia calcar-avis dominated. The list of species of heterotrophic dinoflagellates consisted of 14 species. Species diversity in the eastern part of the sea was higher as compared with its western part. Heterotrophic phytoplankton amounted up to 13% of the total phytoplankton biomass. Species Pronoctiluca pelagica and Ceratium fusus contributed most of all to biomass of heterotrophic component of the phytocenosis (12-93 and 1.7-60% respectively). Population of C. fusus consisted of both autotrophic and heterotrophic cells. Cells of chlorophyll-containing C. fusus dominated in zones of the western and the eastern upwellings. Heterotrophic cells dominated in the center of the sea and in the eastern part of the Main Black Sea current. Similarity and quantitative relations between distributions of heterotrophic P. pelagica and of chlorophyll-containing C. fusus were recognized.

1992年秋季，研究人员针对黑海海域异养藻类（heterotrophic algae）的物种组成与空间分布特征开展了研究。该时期内，浮游植物总生物量波动范围为8~30 g/m²。自养物种角藻（Ceratium fusus）与根管藻（Rhizosolenia calcar-avis）为该海域的优势类群。本次调查共记录到14种异养甲藻（dinoflagellates）。黑海东部海域的物种多样性显著高于西部海域。异养浮游植物的生物量占浮游植物总生物量的比例最高可达13%。尖尾原角藻（Pronoctiluca pelagica）与角藻（Ceratium fusus）对植物群落（phytocenosis）异养组分的生物量贡献最为突出，占比分别为12%~93%和1.7%~60%。角藻（Ceratium fusus）的种群同时包含自养与异养细胞：在西部及东部上升流区域，含叶绿素的角藻细胞占据优势；而在黑海中部与黑海主海流东部海域，异养细胞则为优势类群。研究还发现，异养型尖尾原角藻（Pronoctiluca pelagica）与含叶绿素的角藻的空间分布模式及数量关系具有相似性。