Primary productivity in the Gulf of Riga (Baltic Sea) in relation to phytoplankton species and nutrient variability
Summary: 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 fixati...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2018-10-01
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| Series: | Oceanologia |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0078323418300630 |
| _version_ | 1798043638494658560 |
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| author | Ingrida Purina Atis Labucis Ieva Barda Iveta Jurgensone Juris Aigars |
| author_facet | Ingrida Purina Atis Labucis Ieva Barda Iveta Jurgensone Juris Aigars |
| author_sort | Ingrida Purina |
| collection | DOAJ |
| description | Summary: 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. Keywords: Primary production, New production, Mesodinium rubrum, Aphanizomenon flosaquae, Gulf of Riga, Baltic Sea |
| first_indexed | 2024-04-11T22:51:52Z |
| format | Article |
| id | doaj.art-7d50928ec8b7460da981817505da7635 |
| institution | Directory Open Access Journal |
| issn | 0078-3234 |
| language | English |
| last_indexed | 2024-04-11T22:51:52Z |
| publishDate | 2018-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Oceanologia |
| spelling | doaj.art-7d50928ec8b7460da981817505da76352022-12-22T03:58:33ZengElsevierOceanologia0078-32342018-10-01604544552Primary productivity in the Gulf of Riga (Baltic Sea) in relation to phytoplankton species and nutrient variabilityIngrida Purina0Atis Labucis1Ieva Barda2Iveta Jurgensone3Juris Aigars4Corresponding author at: Latvian Institute of Aquatic Ecology, Voleru Str. 4, LV-1007 Riga, Latvia. Tel.: +371 26186367.; Latvian Institute of Aquatic Ecology, Riga, LatviaLatvian Institute of Aquatic Ecology, Riga, LatviaLatvian Institute of Aquatic Ecology, Riga, LatviaLatvian Institute of Aquatic Ecology, Riga, LatviaLatvian Institute of Aquatic Ecology, Riga, LatviaSummary: 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. Keywords: Primary production, New production, Mesodinium rubrum, Aphanizomenon flosaquae, Gulf of Riga, Baltic Seahttp://www.sciencedirect.com/science/article/pii/S0078323418300630 |
| spellingShingle | Ingrida Purina Atis Labucis Ieva Barda Iveta Jurgensone Juris Aigars Primary productivity in the Gulf of Riga (Baltic Sea) in relation to phytoplankton species and nutrient variability Oceanologia |
| title | Primary productivity in the Gulf of Riga (Baltic Sea) in relation to phytoplankton species and nutrient variability |
| title_full | Primary productivity in the Gulf of Riga (Baltic Sea) in relation to phytoplankton species and nutrient variability |
| title_fullStr | Primary productivity in the Gulf of Riga (Baltic Sea) in relation to phytoplankton species and nutrient variability |
| title_full_unstemmed | Primary productivity in the Gulf of Riga (Baltic Sea) in relation to phytoplankton species and nutrient variability |
| title_short | Primary productivity in the Gulf of Riga (Baltic Sea) in relation to phytoplankton species and nutrient variability |
| title_sort | primary productivity in the gulf of riga baltic sea in relation to phytoplankton species and nutrient variability |
| url | http://www.sciencedirect.com/science/article/pii/S0078323418300630 |
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