TY - JOUR AU - Yasakova, O. N. PY - 2021/09/20 Y2 - 2024/03/29 TI - Status of plankton algocenosis in the water area of the port of Tuapse and beyond it in the spring-summer period of 2019 JF - Marine Biological Journal JA - mbj VL - 6 IS - 3 SE - Scientific communications DO - 10.21072/mbj.2021.06.3.10 UR - https://marine-biology.ru/mbj/article/view/312 SP - 104-114 AB - <p>The article presents the research of qualitative structure and quantitative development of phytoplankton in the water area of the port of Tuapse and beyond it in the spring-summer period of 2019. In April 2019, 43 phytoplankton species of 5 divisions were found. In the port area, the mean values of abundance and biomass were of 568 thousand cells·L<sup>−1</sup> and 206 mg·m<sup>−3</sup>, respectively; in the open sea area, the values were 1.5 times higher. In the port area and beyond it, diatoms developed abundantly: 98–99 % of the total phytoplankton abundance and 62–65 % of the biomass. Small-cell species <em>Pseudo-nitzschia</em> spp. and <em>Skeletonema costatum</em> s. l. formed the basis of the abundance; <em>Pseudosolenia calcar-avis</em>, <em>Dactyliosolen fragilissimus</em>, and <em>Chaetoceros affinis</em> formed the basis of the biomass as well. In June 2019, a decrease was recorded in qualitative (13 species from 4 divisions) and quantitative values of phytoplankton development. In the port area, the mean values of planktonic algae abundance and biomass were of 59 thousand cells·L<sup>−1</sup> and 81 mg·m<sup>−3</sup>, respectively; in the open sea area, these values were more than 2 times lower. In the water area of the port, euglenids developed abundantly: % of the phytoplankton abundance and 83 % of the biomass; those were represented by a mesosaprobic species <em>Eutreptia lanowii</em>. Beyond the port of Tuapse, euglenids were not found; in terms of abundance, diatoms predominated (95 %): <em>Skeletonema costatum</em> s. l. and <em>Thalassionema nitzschioides</em>. The following Dinophyta species formed the basis of the phytoplankton biomass (82 %): <em>Ceratium tripos</em>, <em>C. furca</em>, <em>Ensiculifera carinata</em>, <em>Glenodinium paululum</em>, <em>Prorocentrum micans</em>, and <em>Protoperidinium crassipes</em>.</p> ER -