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1.
L. V. Ilyash L. S. Zhitina T. A. Belevich V. P. Shevchenko M. D. Kravchishina A. N. Pantyulin A. V. Tolstikov A. L. Chultsova 《Oceanology》2016,56(3):372-381
The species composition and biomass of phytoplankton, concentrations of chlorophyll a (Chl a) and nutrients, and accompanying hydrophysical conditions have been studied in the White Sea on July 6–11, 2009. The temperature of the surface water layer was lower than the multiyear average in July. Dinoflagellates dominated in the entire studied area; this was not the typical event for July. We suggest that domination of dinoflagellates was caused by low water temperature, when the nutrient regeneration rate was insufficient to support diatom growth. The abundance of microalgae and the structure of the phytoplankton community depended on the water structure. Variations in the phytoplankton community structure were caused not by substitution of specific species but rather by variability of the abundance of a single species, Heterocapsa triquetra. The highest phytoplankton biomass has been recorded in weakly stratified waters, where tidal mixing supplied the income of inorganic nutrients. The income of nutrients to the photic layer was limited in the stratified waters of Dvina Bay during the summer low-water period, so the phytoplankton abundance was low. We suggest that the lens of surface desalinated water presumably originated from the outlet of the Dvina River was registered in the central part of the White Sea. 相似文献
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Oceanology - The spatial distribution of picophytoplankton abundance, biomass, chlorophyll a and the contribution of picoalgae to the total chlorophyll a was studied in the outer Ob River estuary... 相似文献
4.
L. V. Ilyash I. G. Radchenko L. L. Kuznetsov A. P. Lisitzyn D. M. Martynova A. N. Novigatskiy A. L. Chul’tsova 《Oceanology》2011,51(1):19-26
The species composition, cell concentration (N), and biomass (B) of the phytoplankton, as well as the chlorophyll a (Chl a) concentration, primary production (PP), and the concentrations of the dissolved inorganic micronutrients (phosphorus, silica, nitrogen as nitrite), were estimated
for Kandalaksha Bay (KB), Dvina Bay (DB), and the basin (Bas) of the White Sea in August of 2004. The micronutrient concentrations
were lower compared to the average long-term values for the summer period. The Chl a concentration varies from 0.9 to 2.0 mg/m3 for most of the studied areas, reaching up to 7.5 mg/m3 in the Northern Dvina River estuary. The surface water layer of the DB was the most productive area, where the PP reached up to 270–375 mg C/(m3 day). The phytoplankton biomass varied from 11 to 205 mg C/m3 with the highest values observed in the Bas and DB. Three groups of stations were defined during the analysis of the phytoplankton’s
species composition similarity. The dinoflagellates Dinophysis norvegica and Ceratium fusus were particular to the phytoplankton assemblages in the KB; the diatom Ditylum brightwellii was particular to the upper and central parts of the DB. These three phytoplankton species were less abundant in the Bas. 相似文献
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L. V. Ilyash I. G. Radchenko A. N. Novigatsky A. P. Lisitzin V. P. Shevchenko 《Oceanology》2013,53(2):192-199
The vertical fluxes of phytoplankton (VFPhyto) and particulate organic carbon (VFPOC) in the White Sea were determined using seven long-term (292 to 296 days) sediment traps moored at five stations at 67–255 m depths. The annual VFPhyto and VFPOC ranged from 0.55 to 24.64 g C/m2 and from 3.7 to 93.9 g C/m2, respectively. The highest VFPhyto was observed in the Basin region located close to the Gorlo along the Tersk coast. The algal biomass accounted for 15–43% of the VFPOC. Diatoms comprised the most important group, accounting for 83–100% in the sedimented biomass. Thalassiosira nordenskioeldii dominated in the VFPhyto at all the stations except for the station in the basin close to Onega Bay, where Ditylum brightwellii was the most abundant. 相似文献
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Belevich T. A. Ilyash L. V. Arashkevich E. G. Flint M. V. 《Doklady Earth Sciences》2019,484(2):207-210
Doklady Earth Sciences - The abundance and biomass of picophytoplankton, the total concentration of chlorophyll a, and the contribution of the picofraction to chlorophyll a were studied in the... 相似文献
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Multidisciplinary studies of the separating lakes at different stage of isolation from the White Sea performed in March 2012 总被引：1，自引：0，他引：1
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Radchenko I. G. Ilyash L. V. Shevchenko V. P. Zdorovennov R. E. Novigatsky A. N. Politova N. V. Tolstikov A. V. 《Oceanology》2019,59(3):305-315
Oceanology - The species composition and biomass of phytoplankton, as well as hydrological characteristics, were estimated during four spatial surveys in the Subarctic tidal Kem’ River... 相似文献
9.
The species composition, phytoplankton abundance, and relative yield of the variable fluorescence (F v /F m ) were determined in the mesotrophic Nhatrang Bay in October–November of 2004. The species diversity (250 taxonomic units) and heterogeneity of the phytoplankton structure were high. With respect to the number of species and their abundance, diatoms prevailed. In selected parts of the bay, dinoflagellates dominated. The mean biomass in the water column under 1 m2 (B t ) varied from 2.3 to 64.4 mg C/m3 being 31.0 mg C/m3 on average. The values of B t were the lowest at the stations nearest to the river mouth. Seaward, B t increased. The values of B t increased with depth at some stations and decreased at others. In the surface sea layers, the biomass was lower than that in the underlying waters. The values of F v /F m ranged from 0.10 to 0.64 (at a mean value of 0.49). The lowest values of F v /F m were observed in the area close to the seaport. Over the greater part of the bay, the values of F v /F m were higher than 0.47. Such values are indicative of the relatively high potential photosynthetic activity of the phytoplankton. The abundance and species diversity were higher than those in the dry season (March–April). 相似文献
10.
L. V. Ilyash I. G. Radchenko V. P. Shevchenko A. P. Lisitzin V. T. Paka V. I. Burenkov A. N. Novigatskiy A. L. Chul’tsova A. N. Pantyulin 《Oceanology》2011,51(6):993-1003
The species composition and biomass of the phytoplankton, as well as the hydrophysical and hydrochemical characteristics of
the water masses, were estimated for different areas of the White Sea at 24 stations for the period of August 26 to September
3, 2007. The micronutrient concentrations were lower compared to the average long-term values for the summer period. The total
biomass of phytoplankton (B
t
) varied from 87 to 1914 mg C/m2. For most of the studied sites, B
t
was low; dinoflagellates were the most abundant species. Diatoms dominated in the areas of elevated hydrodynamic activity,
i.e., in the Gorlo (vertical mixing of the water layers), in intrusions of the Gorlo water masses into the basin of the White
Sea, and in the peripheral areas of the Dvina outflow current. The B
t
was also the highest in the listed areas. 相似文献