Seasonal and Long-Term Variability of Coccolithophores in the Black Sea According to Remote Sensing Data and the Results of Field Investigations

Востоков, С. В.; Vostokova, A. S.; Vazyulya, Svetlana

doi:10.3390/jmse10010097

Cited by 12 publications

(5 citation statements)

References 37 publications

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“…данных спутникового зондирования [36][37][38] для исследования сезонных и многолетних изменений фитопланктона восполняет значительные пробелы в изучении динамики Каспийских фитоценозов и создает возможность привязать локальные наблюдения к общей экологической ситуации в море. Использование сравнительного материала [39][40] позволит изучить влияние климатических и антропогенных факторов на динамику хлорофилла в Каспийском море и оценить закономерности развития фитопланктона в современный период.…”

Section: применениеunclassified

Phytoplankton of the middle Caspian Sea: analysis of changes in the structure of the community over the past decades

Востоков

Паутова

Sahling

et al. 2022

Ûg Ross.: èkol. razvit.

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Aim. Analysis of changes in quantitative and structural indicators of phytoplankton in the western and central part of the middle Caspian Sea over the past decades, including according to remote sensing data.Material and Methods. The data was obtained in 2004–2008 and 2019–2022 at different seasons of the year at 40 stations in the central and western part of the middle Caspian Sea. Phytoplankton samples were taken from 4–6 layers. A total of 300 samples of phytoplankton were analyzed. Determination of species and counting of the number of cells was carried out under the “Ergaval” light microscope. WoRMS guided matters of nomenclature.Results. The spring phytoplankton is dominated by the species traditional for the Caspian Sea – Cyclotella caspia diatoms and Prorocetrum micans dinoflagellates. The maximum abundance of C. caspia (5.0 x 104 cell/l) was recorded at depths of 35–40 m. In summer, the maximum phytoplankton biomass (2.2 g/m3) was noted in the seasonal thermocline and was formed due to small flagellates and dinoflagellates. Phytoplankton biomass during winter blooms reached 4.5–5.0 g/m3 and was determined by the development of diatoms (up to 96–99%). Winter blooms were formed by the diatom species traditional for the sea, as well as by the Pseudo‐nitschia seriata and Cerataulina pelagica species.Conclusion. It is shown that in the middle Caspian Sea, the winter and autumn seasons are characterized by a highly productive status. In January–February, periodic blooms of diatoms are observed, as confirmed by satellite data and in situ observations. In summer, phytoplankton biomass is determined by the mass development of dinoflagellates in the seasonal thermocline layer, which has not been recorded by remote methods. In the autumn phytoplankton the main role is played by the diatom component, represented mainly by alien species.

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Section: применениеunclassified

Phytoplankton of the middle Caspian Sea: analysis of changes in the structure of the community over the past decades

Востоков

Паутова

Sahling

et al. 2022

Ûg Ross.: èkol. razvit.

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“…Coccolithophores persist in both the open ocean and coastal areas, and the two most famous coccolithophores Gephyrocapsa huxleyi [commonly known as Emiliania huxleyi (Bendif et al 2019] and Gephyrocapsa oceanica Kamptner, 1943 are known as bloom-forming species (Šupraha et al 2016, Godrijan et al 2018, Balch et al 2019, Vostokov et al 2022). While G. huxleyi blooms are found in highlatitude open-ocean regions, G. oceanica blooms are found in low-latitude tropical and temperate regions (Blackburn & Cresswell 1993, Bretherton et al 2019.…”

Section: Introductionmentioning

confidence: 99%

“…In Suruga Bay, a G. huxleyi bloom was reported in 2007, and occurred when diatom growth depleted silicates and nitrates, and nitrate was resupplied by snowmelt water and rainfall (Hagiwara et al 2011). Thus, as with many episodic phytoplankton blooms, coccolithophore blooms are caused by multiple interacting conditions rather than a single factor (Iida et al 2012, Hopkins et al 2015, Vostokov et al 2022, and it is often not clear which environmental factors trigger extensive blooms.…”

Section: Introductionmentioning

confidence: 99%

Observation of a coccolithophore <i>Gephyrocapsa oceanica</i> bloom in the temperate coastal waters of Sagami Bay, Japan

Yano,

Takayama,

Shimode

et al. 2024

Plankton Benthos Res

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In mid-May 2020, a coccolithophore bloom of Gephyrocapsa oceanica Kamptner, 1943 was observed in Sagami Bay, Japan, possibly for the first time in 25 years. This species is a common yet elusive taxon in the waters around Japan, but there has only been one report of a bloom observation in Sagami Bay in 1995. The G. oceanica bloom in 2020 was observed by the combined approach of the JAXA ocean color remote sensing satellite "Shikisai" and field surveys. The true-color RGB images from the satellite showed the initial bloom in Tokyo Bay appears to have advected into Sagami Bay on May 5. On May 15, ad hoc field sampling was conducted based on visual confirmation from the shore. Nitrate, nitrite and phosphate concentrations at the sea surface were 3.28 µM, 0.11 µM and 0.29 µM, respectively, and higher than the median of May from 1997 to 2019. Chlorophyll a concentration was 2.23 µg L −1 at the sea surface, and cell density was 5.3 × 10 3 cells mL −1 . The large bloom appears to have reached the western shorelines of the bay, and dispersed counterclockwise within the bay. The bloom reached an estimated 1119.02 km 2 surface expression on May 17, and completely disappeared by May 24. Further, the median value of 19′-hexanoyloxyfucoxanthin (a signature pigment of haptophytes, including coccolithophores) concentration has been increasing from 2017 to 2020, and the coastal area of Sagami Bay may have changed to a region favorable for haptophytes.

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“…The most extensive and regular E. huxleyi blooms occur from May to July, covering 45-75% of the Black Sea surface [23]. Particularly strong E. huxleyi blooms are related to colder winters with deep vertical mixing that increases nutrient availability in the surface layer [16,17,26,28]. In late winter, phytoplankton blooms occur as the seasonal thermocline starts to develop.…”

Section: Introductionmentioning

confidence: 99%

Coccolithophore Distribution in the Western Black Sea in the Summer of 2016

Dimiza,

Triantaphyllou,

Ravani

et al. 2023

Diversity

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Coccolithophores are an important component of phytoplankton abundance and biomass in the brackish environments of the Black Sea. Here, the abundance, composition, and distribution of coccolithophores were investigated in water samples taken from the first 50 m at 18 stations in the western Black Sea during a coccolithophore bloom, in June 2016. The total cell abundances ranged from 2 to 763 × 104 coccospheres L−1; Emiliania huxleyi was the most dominant species, but also Syracosphaera spp. (S. dilatata and S. molischii), Acanthoica (A. acanthifera and A. quattrospina), and Algirosphaera robusta displayed remarkably high concentrations. The formation of the seasonal thermocline significantly affects the vertical distribution of coccolithophores. Emiliania huxleyi, Syracosphaera spp., and Acanthoica spp. were restricted to the upper part of the water column, whereas high abundances of Algirosphaera robusta occurred below the thermocline. Overall, our results show significant differences in the vertical (ANOSIM R = 0.50, p = 0.0001) and spatial (ANOSIM R = 0.18, p = 0.0006) distribution of coccolithophores. Higher abundances of E. huxleyi and Syracosphaera spp. were recorded in the northwestern inner shelf region when compared to the open-sea samples. The observed coccolithophore spatial distribution is suggested to be mostly associated with the influx of less saline river water with high nutrient concentrations.

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Seasonal and Long-Term Variability of Coccolithophores in the Black Sea According to Remote Sensing Data and the Results of Field Investigations

Cited by 12 publications

References 37 publications

Phytoplankton of the middle Caspian Sea: analysis of changes in the structure of the community over the past decades

Phytoplankton of the middle Caspian Sea: analysis of changes in the structure of the community over the past decades

Observation of a coccolithophore <i>Gephyrocapsa oceanica</i> bloom in the temperate coastal waters of Sagami Bay, Japan

Coccolithophore Distribution in the Western Black Sea in the Summer of 2016

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