Oceanology (Washington. 1965), 2003-11, Vol.43 (6), p.811-819
2003
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- Autor(en) / Beteiligte
- Titel
- The Provision of the Phytoplankton Community with Inorganic Nitrogen Compounds in the Black Sea during the Spring Period
- Ist Teil von
- Oceanology (Washington. 1965), 2003-11, Vol.43 (6), p.811-819
- Erscheinungsjahr
- 2003
- Beschreibungen/Notizen
- The parameters of the provision of the phytoplankton community with inorganic nitrogen compounds in the western part of the Black Sea in April 1993 are analyzed (specifically, the dependence of the rates of the uptake of nitrates and ammonium by microplankton on the substrate concentration, the diurnal dynamics of the assimilation of mineral nitrogen, the values of the f-ratios, and the proportions of carbon and nitrogen fluxes). In most cases, all the parameters of the degree of the phytoplankton's provision with mineral nitrogen are shown to vary unidirectionally, both at the surface and in the photosynthesis zone. Individual areas of the relatively small region studied differed markedly in their level of the provision of algae with inorganic nitrogen compounds - from complete saturation to a high degree of limitation of the phytoplankton's development due to nitrogen deficiency in the environment. The results obtained allow one to estimate the provision of Black Sea phytoplankton with nitrogen in terms of the limitation of the rates of uptake of its inorganic compounds.