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Primary productivity in the Gulf of Riga (Baltic Sea) in relation to phytoplankton species and nutrient variability

Purina I., Labucis A., Barda I., Jurgensone I., Aigars J.

Oceanologia

2018

No. 60 (4)

544--552

The seasonal patterns of primary production, phytoplankton biomass, chlorophyll a, and nutrients were investigated in the central part of the Gulf of Riga (Baltic Sea) during 2011 and 2012. Annual primary productivity in the gulf was in the range of 353.4–376.2 gC m−2. Maximum carbon fixation rates occurred during the phytoplankton spring bloom from April to May when the winter nutrient pool was rapidly exhausted, suggesting the use of regenerated nutrients already in spring. The new production calculated on the draw-down of nitrates amounted to 51.80% of spring net community production. The production rates during summer were considerably lower owing to the availability of only regenerated nutrients and limited nitrogen fixation. Autumn was established as the least productive season. In autumn despite the elevated nutrient concentrations, the increasingly limited light hindered photosynthetic activity. Species governing the nutrient fluxes and the productivity of the Gulf of Riga are the diatom species responsible for new production in spring. The photosynthetic ciliate Mesodinium rubrum ((Lohmann) Hamburger & Buddenbrock 1911) prevailed in all seasons and significantly correlated with elevated productivity, while diazotrophic cyanobacteria Aphanizomenon flosaquae (Ralfs ex Bornet & Flahault 1886) contributed to new production in the summer nutrient regenerating system.

Wybrane problemy uruchamiania nowej produkcji

Pałucha K.

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

2011

z. 56

215-237

Współczesne zarządzanie produkcją wymaga dobrej organizacji procesów związanych z przygotowaniem i uruchamianiem nowej produkcji. Problematyka zarządzania rozwojem nowych produktów i wprowadzania ich na rynek ma swoje znaczące miejsce w literaturze marketingowej. Znacznie mniej uwagi poświęca się przygotowaniu produkcji od strony technicznej i organizacyjnej.

Modern production management requires good organization of the processes associated with the preparation and launching of new production. Managing the new products development and market has a significant place in the marketing literature. Much less attention is paid to the technical and organizational preparation of production.