Peculiarities of seasonal dynamics of net primary production and its microzooplankton grazing in the coastal waters of the Black Sea (Sevastopol region)

L. Stelmakh, Anastasia A. Farber
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Abstract

The studies of net primary production (NPP) seasonal dynamics, its microzooplankton grazing were conducted at two stations in the western Black Sea coastal waters near Sevastopol during a period from January 2020 to December 2022. Each year, one maximum of the phytoplankton NPP (280–820 mg C·m-3·day-1) was observed in July, when the water temperature ranged from 22 to 25 °C, and solar radiation intensity was 48–50 E·m-2·day-1. Large diatoms and dinoflagellates played a key role in its formation. At this time, the values of the net phytoplankton growth rate were 0.3–1.0 day-1, and the relative share of primary production consumed by microzooplankton (g/m) did not exceed 26%. In December – February, when the water temperature was 8.0–13.5 °C and the intensity of solar radiation was 10–15 E·m-2·day-1, the NPP decreased to a minimum (4–38 mg C·m-3·day-1). Under these conditions, the net phytoplankton growth rate decreased to 0–0.40 day-1, and g/m was 15–100%. For three years at station 2, the contribution of large algae with cell volumes from 4000 to 18000 µm3 in the NPP was significantly higher than at station 1. It was 61.1 % in 2020, 69.7 % in 2021 and 23% in 2022. The consumed NPP for this size group of algae was 54 % in 2020, 68.4 % in 2021 and 47.8 % in 2022.
黑海(塞瓦斯托波尔地区)沿岸水域净初级生产力及其微浮游生物放牧的季节性动态特征
2020 年 1 月至 2022 年 12 月期间,在塞瓦斯托波尔附近的黑海西部沿岸水域的两个站点对净初级生产力(NPP)的季节动态及其微浮游生物放牧进行了研究。每年 7 月是浮游植物净生产力(280-820 毫克碳-米-3-日-1)的最高值,当时水温为 22-25 °C,太阳辐射强度为 48-50 E-m-2-日-1。大型硅藻和甲藻在其形成过程中发挥了关键作用。此时,浮游植物的净增长率为 0.3-1.0 天-1,微浮游生物消耗的初级生产量相对份额(克/米)不超过 26%。12 月至 2 月,水温为 8.0-13.5 °C,太阳辐射强度为 10-15 E-m-2-day-1 时,净初级生产力降至最低(4-38 mg C-m-3-day-1 )。在此条件下,浮游植物净增长率降至 0-0.40 天-1,克/米为 15-100%。在 2 号站的三年中,细胞体积为 4000 至 18000 µm3 的大型藻类对净生产力的贡献明显高于 1 号站。2020 年为 61.1%,2021 年为 69.7%,2022 年为 23%。这种大小的藻类消耗的净生产力在 2020 年为 54%,2021 年为 68.4%,2022 年为 47.8%。
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