scholarly journals Seasonal dynamics of fecundity and recruitment of Temora longicornis in the Baltic Sea

2012 ◽  
Vol 462 ◽  
pp. 51-66 ◽  
Author(s):  
J Dutz ◽  
JEE van Beusekom ◽  
R Hinrichs
Keyword(s):  
Baltic Sea ◽  
Seasonal Dynamics ◽  
The Baltic Sea ◽  
Temora Longicornis ◽  
The Baltic

scholarly journals Life cycle and spring phenology of Temora longicornis in the Baltic Sea

2010 ◽  
Vol 406 ◽  
pp. 223-238 ◽  
Author(s):  
J Dutz ◽  
V Mohrholz ◽  
JEE van Beusekom
Keyword(s):  
Life Cycle ◽  
Baltic Sea ◽  
The Baltic Sea ◽  
Spring Phenology ◽  
Temora Longicornis ◽  
The Baltic

scholarly journals Seasonality of Coastal Picophytoplankton Growth, Nutrient Limitation, and Biomass Contribution

2021 ◽  
Vol 12 ◽  
Author(s):  
Javier Alegria Zufia ◽  
Hanna Farnelid ◽  
Catherine Legrand
Keyword(s):  
Baltic Sea ◽  
Nutrient Limitation ◽  
Seasonal Dynamics ◽  
Phytoplankton Biomass ◽  
Phytoplankton Community ◽  
The Baltic Sea ◽  
Coastal Site ◽  
Total Phytoplankton ◽  
Temperature Ranges ◽  
The Baltic

Picophytoplankton in the Baltic Sea includes the simplest unicellular cyanoprokaryotes (Synechococcus/Cyanobium) and photosynthetic picoeukaryotes (PPE). Picophytoplankton are thought to be a key component of the phytoplankton community, but their seasonal dynamics and relationships with nutrients and temperature are largely unknown. We monitored pico- and larger phytoplankton at a coastal site in Kalmar Sound (K-Station) weekly during 2018. Among the cyanoprokaryotes, phycoerythrin-rich picocyanobacteria (PE-rich) dominated in spring and summer while phycocyanin-rich picocyanobacteria (PC-rich) dominated during autumn. PE-rich and PC-rich abundances peaked during summer (1.1 × 105 and 2.0 × 105 cells mL–1) while PPE reached highest abundances in spring (1.1 × 105 cells mL–1). PPE was the main contributor to the total phytoplankton biomass (up to 73%). To assess nutrient limitation, bioassays with combinations of nitrogen (NO3 or NH4) and phosphorus additions were performed. PE-rich and PC-rich growth was mainly limited by nitrogen, with a preference for NH4 at >15°C. The three groups had distinct seasonal dynamics and different temperature ranges: 10°C and 17–19°C for PE-rich, 13–16°C for PC-rich and 11–15°C for PPE. We conclude that picophytoplankton contribute significantly to the carbon cycle in the coastal Baltic Sea and underscore the importance of investigating populations to assess the consequences of the combination of high temperature and NH4 in a future climate.

scholarly journals Seasonality of Coastal Picophytoplankton Growth, Nutrient Limitation and Biomass Contribution

2021 ◽  
Author(s):  
Javier Alegria Zufia ◽  
Hanna Farnelid ◽  
Catherine Legrand
Keyword(s):  
High Temperature ◽  
Baltic Sea ◽  
Nutrient Limitation ◽  
Seasonal Dynamics ◽  
Phytoplankton Biomass ◽  
Phytoplankton Community ◽  
The Baltic Sea ◽  
Coastal Site ◽  
Total Phytoplankton ◽  
The Baltic

Abstract Picophytoplankton in the Baltic Sea includes picocyanobacteria (Synechococcus/Cyanobium) and photosynthetic picoeukaryotes (PPE). Picophytoplankton are thought to be a key component of the phytoplankton community but their seasonal dynamics and relationships with nutrients and temperature are largely unknown. We monitored pico- and larger phytoplankton at a coastal site in Kalmar Sound (K-Station) weekly during 2018. Among the picocyanobacteria, phycoerythrin-rich Synechococcus (PE-rich) dominated in spring and summer while phycocyanin-rich Synechococcus (PC-rich) dominated during autumn. PE-rich and PC-rich abundances peaked during summer (1.1x105 and 2.0x105 cells mL− 1) while PPE reached highest abundances in spring (1.1x105 cells mL− 1). PPE was the main contributor to the total phytoplankton biomass (3–73%). To assess nutrient limitation, bioassays with combinations of nitrogen (NO3 or NH4) and phosphorus additions were performed. PE-rich and PC-rich growth was mainly limited by nitrogen, with a preference for NH4 at 15–19°C. The three groups had distinct seasonal dynamics and optimal temperatures for growth were 10°C and 17–19°C for PE-rich, 13–16°C for PC-rich and 11–15°C for PPE. We conclude that picophytoplankton contribute significantly to the carbon cycle in the coastal Baltic Sea and underscore the importance of investigating functional groups to assess the consequences of the combination of high temperature and NH4 in a future climate.

scholarly journals Seasonal dynamics of early life stages of invasive and native ctenophores give clues to invasion and bloom potential in the Baltic Sea

2013 ◽  
Vol 35 (3) ◽  
pp. 582-594 ◽  
Author(s):  
Cornelia Jaspers ◽  
Matilda Haraldsson ◽  
Fabien Lombard ◽  
Sören Bolte ◽  
Thomas Kiørboe
Keyword(s):  
Baltic Sea ◽  
Seasonal Dynamics ◽  
Early Life ◽  
Life Stages ◽  
Early Life Stages ◽  
The Baltic Sea ◽  
The Baltic

scholarly journals Selecting for three copepods—feeding of sprat and herring in the Baltic Sea

2018 ◽  
Vol 75 (7) ◽  
pp. 2439-2449 ◽  
Author(s):  
Henn Ojaveer ◽  
Ain Lankov ◽  
Tiit Raid ◽  
Arno Põllumäe ◽  
Riina Klais
Keyword(s):  
Baltic Sea ◽  
Stomach Content ◽  
Zooplankton Community ◽  
Clupea Harengus ◽  
Dietary Overlap ◽  
The Baltic Sea ◽  
Predator Prey ◽  
Temora Longicornis ◽  
The Baltic ◽  
The Individual

Abstract Predator–prey interactions are a primary structuring force in marine foodwebs and they play an important role in the dynamics of both marine fish populations and their prey. We investigated the individual and spatial patterns in the feeding of two dominant zooplanktivorous clupeids—herring Clupea harengus membras and sprat Sprattus sprattus—in the Baltic Sea in summer, by means of a taxonomic analysis of stomach content. Both species consumed predominantly the small-sized copepods (Temora longicornis, Eurytemora affinis, and Acartia spp.). E. affinis and T. longicornis were generally positively selected by both species. Centropages hamatus was selected only by sprat. With the exception of Pleopis/Podon spp. in the case of small sprat, the remaining prey, i.e. the zooplankton taxa that were found in fish stomachs, were consumed at similar proportions as they occurred in zooplankton. Stomach fullness of fish increased with the increasing proportions of prey in the zooplankton community. The share of empty stomachs was lower for sprat, and among smaller fish in both species. Pairwise dietary overlap between fish decreased when zooplankton diversity increased. Dietary overlap was also lowest among the individuals of sprat, probably due to the wider diet spectrum and diversity of stomach content compared to herring. Our results point to high interspecific competition, where sprat seems to be more successful than herring in finding and consuming prey, and therefore may have an advantage over herring when the zooplankton community is dominated by small-sized taxa.

Temporal and spatial sedimentation rate variabilities in the eastern Gotland Basin, the Baltic Sea

Boreas ◽  
2002 ◽  
Vol 31 (1) ◽  
pp. 65-74 ◽  
Author(s):  
Christian Christiansen ◽  
Helmar Kunzendorf ◽  
Kay-Christian Emeis ◽  
Rudolf Endler ◽  
Ulrich Struck ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Sedimentation Rate ◽  
The Baltic Sea ◽  
Gotland Basin ◽  
Temporal And Spatial ◽  
The Baltic

Russian Oil: Production and Exports

2003 ◽  
pp. 136-146
Author(s):  
K. Liuhto
Keyword(s):  
Baltic Sea ◽  
Statistical Data ◽  
Oil Production ◽  
The Baltic Sea ◽  
North West ◽  
The North ◽  
Oil Transportation ◽  
Sea Ports ◽  
The Baltic

Statistical data on reserves, production and exports of Russian oil are provided in the article. The author pays special attention to the expansion of opportunities of sea oil transportation by construction of new oil terminals in the North-West of the country and first of all the largest terminal in Murmansk. In his opinion, one of the main problems in this sphere is prevention of ecological accidents in the process of oil transportation through the Baltic sea ports.

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