Study of seasonal and long-term phytoplankton variability in the Caspian Sea based on remote sensing data.

Востоков, С. В.; Sahling, Inna; Vostokova, A. S.; Shojaei, Mehdi Ghodrati

doi:10.1117/12.2645217

Cited by 1 publication

(1 citation statement)

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“…One of the previous studies has pointed to a progressive eutrophication of the Caspian Sea [46]. Remote studies based on regional algorithms for the calculation of chlorophyll concentrations only make it possible to reveal generalized patterns of spatial and seasonal development of phytoplankton across the entire area of the sea [49]. Moreover, to date, the dynamics of production processes in the Caspian Sea, as extrapolated from satellite data on the chlorophyll variability, have not been compared with the quantitative and structural characteristics of the Caspian phytoplankton.…”

Section: Introductionmentioning

confidence: 99%

Seasonal and Long-Term Phytoplankton Dynamics in the Middle Caspian According to Satellite Data and In Situ Observations in the First Decades of the 21st Century

Востоков

Паутова

Sahling

et al. 2023

JMSE

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Seasonal and long-term variability of phytoplankton in the Middle Caspian was studied based on remote sensing data of the sea by SeaWiFS and MODIS-Aqua scanners in 1998–2021 and the results of field observations in 2004–2021. The seasonal variability of chlorophyll “a” (CHL) calculated from satellite data using a regional algorithm indicated that the autumn and winter seasons were the main phytoplankton production periods of the year. In summer, a period of stagnation was observed in phytoplankton growth in the surface layer. However, according to satellite data in the first months of each year, winter blooms were observed recurrently in the Middle Caspian Sea, as confirmed by the results of field observations in 2004–2021. The phytoplankton biomass during the winter vegetation period reached 4.5–5.0 g/m3. In the first decade of the century (2004–2006), winter blooms were almost entirely (as much as 96%) formed through the mass growth of the alien diatom Cerataulina pelagica. In the modern period (2021), the winter bloom was formed both by three endemic diatom species Thalassionema nitzschioides, Cyclotella comta and Dactyliosolen fragilissimus and by two alien species Pseudo-nitzschia seriata and Cerataulina pelagica. In spring, the diatom Cyclotella caspia and the dinoflagellate Prorocentrum micans, both endemics, dominated. In summer, the phytoplankton biomass was composed of the mass growth of small flagellates and dinoflagellates in the seasonal thermocline layer, which current remote sensing methods cannot record. The diatoms’ contribution to the community’s total biomass in summer did not exceed 3%. In the autumn phytoplankton, the main role was played by a diatom component represented by alien species, mainly Chaetoceros peruvianus.

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Section: Introductionmentioning

confidence: 99%