Sexuality and cyst formation of the spring-bloom dinoflagellate Scrippsiella hangoei in the coastal northern Baltic Sea

1999 ◽  
Vol 134 (4) ◽  
pp. 771-777 ◽  
Author(s):  
A. Kremp ◽  
A.-S. Heiskanen
Keyword(s):  
Baltic Sea ◽  
Spring Bloom ◽  
Cyst Formation ◽  
Scrippsiella Hangoei

scholarly journals Climate Driven Changes in Timing, Composition and Magnitude of the Baltic Sea Phytoplankton Spring Bloom

2019 ◽  
Vol 6 ◽  
Author(s):  
Olle Hjerne ◽  
Susanna Hajdu ◽  
Ulf Larsson ◽  
Andrea S. Downing ◽  
Monika Winder
Keyword(s):  
Baltic Sea ◽  
Secondary Production ◽  
Spring Bloom ◽  
High Water ◽  
Aquatic Systems ◽  
Substantial Part ◽  
Phytoplankton Blooms ◽  
The Baltic Sea ◽  
Benthic Secondary Production ◽  
The Baltic

Spring phytoplankton blooms contribute a substantial part to annual production, support pelagic and benthic secondary production and influence biogeochemical cycles in many temperate aquatic systems. Understanding environmental effects on spring bloom dynamics is important for predicting future climate responses and for managing aquatic systems. We analyzed long-term phytoplankton data from one coastal and one offshore station in the Baltic Sea to uncover trends in timing, composition and size of the spring bloom and its correlations to environmental variables. There was a general trend of earlier phytoplankton blooms by 1–2 weeks over the last 20 years, associated with more sunshine and less windy conditions. High water temperatures were associated with earlier blooms of diatoms and dinoflagellates that dominate the spring bloom, and decreased diatom bloom magnitude. Overall bloom timing, however, was buffered by a temperature and ice related shift in composition from early blooming diatoms to later blooming dinoflagellates and the autotrophic ciliate Mesodinium rubrum. Such counteracting responses to climate change highlight the importance of both general and taxon-specific investigations. We hypothesize that the predicted earlier blooms of diatoms and dinoflagellates as a response to the expected temperature increase in the Baltic Sea might also be counteracted by more clouds and stronger winds. A shift from early blooming and fast sedimenting diatoms to later blooming groups of dinoflagellates and M. rubrum at higher temperatures during the spring period is expected to increase energy transfers to pelagic secondary production and decrease spring bloom inputs to the benthic system, resulting in lower benthic production and reduced oxygen consumption.

scholarly journals Shifting Diatom—Dinoflagellate Dominance During Spring Bloom in the Baltic Sea and its Potential Effects on Biogeochemical Cycling

2018 ◽  
Vol 5 ◽  
Author(s):  
Kristian Spilling ◽  
Kalle Olli ◽  
Jouni Lehtoranta ◽  
Anke Kremp ◽  
Letizia Tedesco ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Spring Bloom ◽  
Biogeochemical Cycling ◽  
The Baltic Sea ◽  
The Baltic

High-resolution dynamics of the spring bloom in the Gulf of Finland of the Baltic Sea

2014 ◽  
Vol 129 ◽  
pp. 135-149 ◽  
Author(s):  
Inga Lips ◽  
Nelli Rünk ◽  
Villu Kikas ◽  
Aet Meerits ◽  
Urmas Lips
Keyword(s):  
High Resolution ◽  
Baltic Sea ◽  
Spring Bloom ◽  
Gulf Of Finland ◽  
The Baltic Sea ◽  
The Baltic ◽  
The Gulf Of Finland

scholarly journals Spatio-temporal mosaic of the phytoplankton spring bloom in the open Baltic Sea in 1986

1990 ◽  
Vol 66 ◽  
pp. 301-309 ◽  
Author(s):  
M Kahru ◽  
J-M Leppanen ◽  
S Nommann ◽  
U Passow ◽  
L Postel ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Spring Bloom ◽  
Spatio Temporal

scholarly journals No observed effect of ocean acidification on nitrogen biogeochemistry in a summer Baltic Sea plankton community

2016 ◽  
Vol 13 (13) ◽  
pp. 3901-3913 ◽  
Author(s):  
Allanah J. Paul ◽  
Eric P. Achterberg ◽  
Lennart T. Bach ◽  
Tim Boxhammer ◽  
Jan Czerny ◽  
...  
Keyword(s):  
Ocean Acidification ◽  
Baltic Sea ◽  
N2 Fixation ◽  
Spring Bloom ◽  
Plankton Community ◽  
Organic N ◽  
Filamentous Cyanobacteria ◽  
The Baltic Sea ◽  
N Supply ◽  
The Baltic

Abstract. Nitrogen fixation by filamentous cyanobacteria supplies significant amounts of new nitrogen (N) to the Baltic Sea. This balances N loss processes such as denitrification and anammox, and forms an important N source supporting primary and secondary production in N-limited post-spring bloom plankton communities. Laboratory studies suggest that filamentous diazotrophic cyanobacteria growth and N2-fixation rates are sensitive to ocean acidification, with potential implications for new N supply to the Baltic Sea. In this study, our aim was to assess the effect of ocean acidification on diazotroph growth and activity as well as the contribution of diazotrophically fixed N to N supply in a natural plankton assemblage. We enclosed a natural plankton community in a summer season in the Baltic Sea near the entrance to the Gulf of Finland in six large-scale mesocosms (volume ∼ 55 m3) and manipulated fCO2 over a range relevant for projected ocean acidification by the end of this century (average treatment fCO2: 365–1231 µatm). The direct response of diazotroph growth and activity was followed in the mesocosms over a 47 day study period during N-limited growth in the summer plankton community. Diazotrophic filamentous cyanobacteria abundance throughout the study period and N2-fixation rates (determined only until day 21 due to subsequent use of contaminated commercial 15N-N2 gas stocks) remained low. Thus estimated new N inputs from diazotrophy were too low to relieve N limitation and stimulate a summer phytoplankton bloom. Instead, regeneration of organic N sources likely sustained growth in the plankton community. We could not detect significant CO2-related differences in neither inorganic nor organic N pool sizes, or particulate matter N : P stoichiometry. Additionally, no significant effect of elevated CO2 on diazotroph activity was observed. Therefore, ocean acidification had no observable impact on N cycling or biogeochemistry in this N-limited, post-spring bloom plankton assemblage in the Baltic Sea.

scholarly journals Spatio-Temporal Interdependence of Bacteria and Phytoplankton during a Baltic Sea Spring Bloom

2016 ◽  
Vol 7 ◽  
Author(s):  
Carina Bunse ◽  
Mireia Bertos-Fortis ◽  
Ingrid Sassenhagen ◽  
Sirje Sildever ◽  
Conny Sjöqvist ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Spring Bloom ◽  
Spatio Temporal

Consequences of increased temperature and acidification on bacterioplankton community composition during a mesocosm spring bloom in the Baltic Sea

2012 ◽  
Vol 5 (2) ◽  
pp. 252-262 ◽  
Author(s):  
Markus V. Lindh ◽  
Lasse Riemann ◽  
Federico Baltar ◽  
Claudia Romero-Oliva ◽  
Paulo S. Salomon ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Community Composition ◽  
Spring Bloom ◽  
The Baltic Sea ◽  
Bacterioplankton Community ◽  
Increased Temperature ◽  
The Baltic

scholarly journals The role of N<sub>2</sub>-fixation to simulate the <i>p</i>CO<sub>2</sub> observations from the Baltic Sea

2005 ◽  
Vol 2 (3) ◽  
pp. 609-636 ◽  
Author(s):  
A. Leinweber ◽  
T. Neumann ◽  
B. Schneider
Keyword(s):  
Baltic Sea ◽  
Inorganic Carbon ◽  
Spring Bloom ◽  
Dissolved Inorganic Carbon ◽  
Inorganic Nitrogen ◽  
Biogeochemical Model ◽  
Winter Period ◽  
State Variables ◽  
Nitrogen Fixing ◽  
C:P Ratio

Abstract. Measurements in the central Baltic Sea have shown that dissolved inorganic carbon (DIC) concentrations in the upper water column continue to decrease even after complete depletion of dissolved inorganic nitrogen (DIN). To explain this observation, a new external supply of nitrogen is required without a concomitant supply of inorganic carbon. The primary proposed candidate process is N2-fixation. In order to address this question in the eastern Gotland Sea, a biogeochemical model containing nine state variables including diatoms, flagellates, and nitrogen fixing cyanobacteria, was coupled to a 1D physical model. The results from the winter period until the onset of the spring bloom of 1997 gave reasonable surface water values for partial pressure of CO2 (pCO2) compared with measurements of the pCO2. However, the model failed to simulate the observed pCO2 drawdown for the period from the end of the spring bloom until late summer. Even after introducing a seasonal dissolved organic carbon (DOC) excess production and varying different process parameterization the simulated pCO2 values did not improve. Only the shift from a sharp to a moderate temperature dependency in addition to an increase in the C:P ratio of the nitrogen fixing cyanobacteria made it possible for the model to match the pCO2 observations. The resulting total nitrogen fixation (167 mmol m-2 a-1) exceeds previous measurement-based estimates but is in good agreement with recent rate measurement based estimates.

Sign in / Sign up

Export Citation Format

Share Document