КамчатНИРО
91
yearsKamchatka Research Institute of Fisheries and Oceanography
years
Journal / Archives
УДК 581.526.325DOI: Download the full article
The phytoplankton of the Kamchatka river estuary
In the plankton of the estuarine water bodies of the Kamchatka River (the Kultuchnoe, Nerpich’e Lakes, the side channel Ozernaya, mouth area of the Kamchatka River, the Takhirskie Lakes — creeks-lagoons appeared in the place of the former Takhirka Gulf) were found 105 species, varieties and forms of microalgae. Blue-green algae Planktothrix agardhii, Limnothrix planctonica, Phormidium granulatum, Anabaena spp., Aphanozomenon cf. flexuosum, Nodularia spumigena, Woronochinia cf. compacta prevail in abundance and biomass with the dominant species Planktothrix agardhii. The salinity of the estuary lakes is increased during last 100 years that caused an increase in water mineralization and natural eutrophication of the lake zonе. As a result of the natural phenomenon, the estuarine water bodies (the Kultuchnoe and Nerpichie Lakes) have become planktotrichetic. They are characterized by a high concentration of mineral nitrogen (ammonium) up to 2 mgN/L, a high value ratio of mineral nitrogen to phosphorus (from 10 to 18), accumulation of hydrogen sulfide in the benthopelagic boundary layer and its opacity.
УДК 581.521.325 DOI: 10.15853/2072-8212.2018.50.63-76Download the full article
Structure and seasonal dinamics of phytoplankton in Ptichye Lake of the lagoon-type (South Sakhalin)
Based on the results of plankton surveys in 2012–2013, analysis of qualitative composition of phytoplankton was made and description of structural specifics and seasonal dynamics of quantitative indices was provided for the Ptichye Lake of a lagoon type (Southern Sakhalin), having no permanent water exchange with the sea. There were 223 microalgae species and intraspecific taxa revealed, where diatoms predominate (119). The density of the phytoplankton varied from 0.04 to 1590.47 thous. cells/l, and the biomass – from 0.005 to 37 609.811 mg/m3. Spring, summer and autumn peaks of phytoplankton density and biomass have been observed.