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    Temporal variations of phytoplankton community and their correlation with environmental factors in the coastal waters of the canakkale Strait in 2018
    (Polish Acad Sciences Inst Oceanology, 2022) Demir, Egemen Inan; Türkoğlu, Muhammet
    In order to investigate temporal variations in phytoplankton connected with hydrography, high-resolution (twice a week) samplings were carried out between January and December 2018 at a single, shallow water station in the Dardanelles. Diatoms dominated in early and mid-winter, late spring and early summer, and between August and October. Whereas dinoflagellates dominated in the period from mid-February to the end of the third week of May, mid-summer, and late autumn. Other groups were generally more abundant in the early summer and mid-autumn than any other period. Late spring and early summer, mid-autumn and middle winter were the important bloom periods. The average contribution of diatom abundance (5.00 x 10 5 +/- 7.80 x 10 5 cells L -1 ) to average total phytoplankton abundance (9.63 x 10 5 +/- 7.88 x 10 5 cells L -1 ) was above 50% (average: 51.88%) during the year except spring (34.32%). However, the average contribution of dinoflagellates (43.32 +/- 20.69%) and others (4.81 +/- 6.99%) to the total phytoplankton abundance were lower than the abundance of the diatoms (51.88 +/- 21.61%). The study revealed a decrease both in the total number of algal blooms which also included HABs and their densities in the region compared to the previous findings. These observations seem to evidence environmental status improvement of the investigated area, manifested in an average chlorophyll a concentration (0.71 +/- 0.52 mu g L -1 ) and quantitative phytoplankton structure (10 3 to 10 5 cells L -1 ). (c) 2021 Institute of Oceanology of the Polish Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ).