Article
Environmental Sciences
Marta Konik, Katarzyna Bradtke, Joanna Ston-Egiert, Monika Soja-Wozniak, Sylwia Sliwinska-Wilczewska, Miroslaw Darecki
Summary: Cyanobacteria blooms in the Baltic Sea have been challenging to map due to their high dynamics and specific radiometric footprint. In this study, we assessed the use of the cyanobacteria index (CI) as an alternative approach, which showed a close relationship between positive CI values and phycocyanin concentration. The CI index efficiently identified cyanobacteria-dominated blooms near the surface and revealed an elongation of the bloom season.
Article
Ecology
Jenny Hieronymus, Kari Eilola, Malin Olofsson, Inga Hense, H. E. Markus Meier, Elin Almroth-Rosell
Summary: By introducing a cyanobacteria life cycle model, researchers have successfully improved the representation of cyanobacteria in the Baltic Sea within a three-dimensional coupled model, enhancing their ability to predict seasonal patterns. This model can be utilized to continuously predict internal nitrogen loads in Baltic Sea ecosystem management.
Article
Environmental Sciences
Oscar Dario Beltran-Perez, Joanna J. Waniek
Summary: The study investigated the inter-annual variability and phenology of spring and summer phytoplankton blooms in the eastern Baltic Sea. Results showed that summer blooms occur earlier, last longer, and are more sensitive to changes in environmental conditions compared to spring blooms.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Marine & Freshwater Biology
Ellen R. Salamon Slater, Kendra A. Turk-Kubo, Soren Hallstrom, Katharina Kesy, Peeter Laas, Jonathan Magasin, Jonathan P. Zehr, Matthias Labrenz, Lasse Riemann
Summary: Nitrogen fixation rates in the Baltic Sea are high, but knowledge about the composition and distribution of diazotrophs is limited. This study reveals that Pseudanabaena and non-cyanobacterial diazotrophs dominate the composition, while filamentous heterocyst-forming cyanobacteria account for most of the nitrogenase gene expression. Salinity has some influence on the composition, and different diazotrophs show varying expression levels at different salinities.
ESTUARINE COASTAL AND SHELF SCIENCE
(2023)
Article
Environmental Sciences
Ilaria Cazzaniga, Giuseppe Zibordi, Frederic Melin
Summary: This study investigated the temporal evolution of in situ remote sensing reflectance patterns during cyanobacteria blooms in the Baltic Sea. It also assessed the suitability of satellite remote sensing data for cyanobacteria detection. The results showed poor agreement between in situ and satellite-derived data, but the bands in the green-red spectral region exhibited potential to indicate the presence and development stage of cyanobacteria blooms.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Engineering, Environmental
Malin Olofsson, Isabell Klawonn, Bengt Karlson
Summary: It was found that dense blooms of diazotrophic filamentous cyanobacteria are formed every summer in the Baltic Sea, contributing significantly to nitrogen fixation. The estimated nitrogen fixation rates exceed external nitrogen loading in some regions, highlighting the importance of such estimates for ecosystem management.
Review
Ecology
Britta Munkes, Ulrike Loeptien, Heiner Dietze
Summary: The ecosystem of the Baltic Sea is endangered by eutrophication, with international management efforts hindered by factors like cyanobacteria blooms. The lack of comprehensive understanding of controlling cyanobacteria blooms contributes to uncertainties in model-based projections for the Baltic Sea's warming future.
Article
Environmental Sciences
Lisa Roenspiess, Guenther Nausch, Detlef Schulz-Bull
Summary: Phosphorus is a major driver of eutrophication, and our experiments showed that bioavailable phosphorus accounts for 20-94% of total phosphorus, indicating that commonly monitored phosphorus fractions may underestimate the bioavailable phosphorus content.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Microbiology
Ineta Liepina-Leimane, Ieva Barda, Iveta Jurgensone, Atis Labucis, Natalija Suhareva, Vendija Kozlova, Agita Maderniece, Juris Aigars
Summary: This study used the (15)N tracer method to investigate the diazotrophic activity in different seasons in the Gulf of Riga, Baltic Sea. The results show that Aphanizomenon flosaquae, the dominant cyanobacteria species in the region, has a strong correlation between its heterocyst biomass and N-2 fixation rate. This study highlights the importance of a heterocyst-focused approach in accurately evaluating diazotrophic activity.
FEMS MICROBIOLOGY ECOLOGY
(2022)
Article
Environmental Sciences
Tuuli Soomets, Kaire Toming, Jekaterina Jefimova, Andres Jaanus, Arno Pollumae, Tiit Kutser
Summary: This study used remote sensing data to estimate nutrient concentrations in Estonian marine waters, with a focus on total nitrogen. The results showed that remote sensing could be a reliable method for monitoring nutrient loads and understanding regional water quality in marine ecosystems.
Article
Chemistry, Multidisciplinary
Ian-Andreas Rahn, Kersti Kangro, Andres Jaanus, Krista Alikas
Summary: This study aimed to test and develop indicators for remote sensing assessment of cyanobacterial blooms and their impact on eutrophication and environmental status. Various methods and data were used to evaluate and monitor cyanobacterial blooms in the Estonian coastal regions.
APPLIED SCIENCES-BASEL
(2023)
Article
Green & Sustainable Science & Technology
Joseph S. Pechsiri, Fredrik Grondahl
Summary: This study evaluates the environmental and economic performance of harvesting wild cyanobacteria during summer blooms in the Baltic Sea from an energy perspective, including the use of traditional sailing boats as an alternative energy-efficient method. The results show that achieving a break-even EROI of 1 is possible by considering biogas yield and the use of sailing boats, with an EROI > 6 possible depending on biomass concentration, indicating the importance of nutrient recovery for the harvest of wild cyanobacteria.
JOURNAL OF INDUSTRIAL ECOLOGY
(2022)
Article
Pharmacology & Pharmacy
Tania Keiko Shishido, Endrews Delbaje, Matti Wahlsten, Inkeri Vuori, Jouni Jokela, Muriel Gugger, Marli F. Fiore, David P. Fewer
Summary: This study reports the isolation of a harmful cyanobacterium (Kamptonema sp. UHCC 0994) from a benthic microbial mat collected in shallow water on the coast of Helsinki. Genome sequencing analysis revealed similarities between this harmful cyanobacterial strain and strains isolated from the Baltic Sea, all of which contain the biosynthetic genes for the production of the harmful compound cylindrospermopsin. These findings suggest that these toxic cyanobacteria may exhibit a tychoplanktic lifestyle in the Baltic Sea and could be a potential source of environmental toxins.
Article
Geosciences, Multidisciplinary
Veronica Gonzalez-Gambau, Estrella Olmedo, Antonio Turiel, Cristina Gonzalez-Haro, Aina Garcia-Espriu, Justino Martinez, Pekka Alenius, Laura Tuomi, Rafael Catany, Manuel Arias, Carolina Gabarro, Nina Hoareau, Marta Umbert, Roberto Sabia, Diego Fernandez
Summary: This paper presents the first dedicated products for Soil Moisture and Ocean Salinity (SMOS) Sea Surface Salinity (SSS) over the Baltic Sea. These products overcome technical challenges and provide important data for understanding salinity dynamics in the region.
EARTH SYSTEM SCIENCE DATA
(2022)
Article
Environmental Sciences
Katharine Heyl
Summary: The eutrophication of the Baltic Sea is a longstanding environmental issue caused by excessive phosphorus input. The Helsinki Convention and the updated Baltic Sea Action Plan were adopted by neighboring states to address this problem. This article assesses how the Common Agricultural Policy in Germany implements the agriculture actions of the updated Baltic Sea Action Plan and contributes to the Helsinki Convention objective. Results show that while the policy addresses most actions, shortcomings such as voluntariness, limited funding, and lack of real reform may offset its potential. Additional effective policy instruments at the EU level are needed.
Article
Geosciences, Multidisciplinary
X. Flores-Melo, R. Giesecke, I. R. Schloss, M. P. Latorre, X. Durrieu de Madron, F. Bourrin, M. L. Spinelli, C. Menniti, H. E. Gonzales, E. Menschel, J. Martin
Summary: This study presents an evaluation of the downward fluxes and composition of particulate matter in the Beagle Channel. The results show that the fluxes and composition of particulate matter differ between the western and eastern parts of the channel, with the former influenced by glacial and organic material, and the latter dominated by river inputs and phytoplankton blooms. This research contributes to understanding the impact of climate change on the biological carbon pump and land-sea connections in this high-latitude ecosystem.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
Simone M. A. Lira, Ralf Schwamborn, Mauro de Melo Junior, Humberto L. Varona, Syumara Queiroz, Doris Veleda, Alef J. Silva, Sigrid Neumann-Leitao, Moacyr Araujo, Catarina R. Marcolin
Summary: In this study, CTD and ADCP data, as well as zooplankton samples from Fernando de Noronha Archipelago, were used to analyze the relationship between flow, island topography, chlorophyll-a fluorescence, and zooplankton abundance. The study found the presence of island and larval island effects downstream, and an upstream island effect upstream.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
Olga Yu. Evseeva, Alexander G. Dvoretsky
Summary: This study investigated the species composition and spatial distribution of bryozoan diversity in the southern region of Franz Josef Land. A total of 151 bryozoan species were found, including 22 species recorded for the first time in this region. The diversity of bryozoans in this area is influenced by environmental factors such as depth, temperature, and the content of stones and shells.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
Emma F. Young, Sally E. Thorpe, Angelika H. H. Renner, Eugene J. Murphy
Summary: Antarctic krill is a key species in the Southern Ocean and also the target of a commercial fishery. This study focuses on understanding the physical and behavioral drivers of krill movement and retention in the South Orkney Islands region through a regional modeling approach. The results suggest that oceanic transport and retention of krill are influenced by oceanographic variability and krill behavior.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
Viviane David, Anne Mouget, Pierre Thiriet, Corentin Minart, Yannick Perrot, Loic Le Goff, Olivier Bianchimani, Solene Basthard-Bogain, Tristan Estaque, Justine Richaume, Jean-Francois Sys, Adrien Cheminee, Eric Feunteun, Anthony Acou, Patrice Brehmer
Summary: Scientists combined split-beam and multibeam echosounders to detect and classify different fish species, and found that acoustic data significantly improved the accuracy of species classification. These acoustic methods have important implications for marine management and decision-making.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
Jia-Hui Xie, Xue-Lin Shao, Kai Ma, Li Gao
Summary: Chaetomorpha linum can store a large amount of phosphorus and utilize it for growth when phosphate is abundant, and it can produce alkaline phosphatase and release mobile phosphorus from sediments when phosphate is deficient. The sources of phosphorus supporting the blooms of C. linum vary seasonally in Swan Lagoon.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
A. A. Kubryakov, A. I. Mizyuk, S. V. Stanichny
Summary: This article investigates the evolution of the Sevastopol eddies using altimetry measurements and a high-resolution Nemo numerical model. The eddies can reside in the Black Sea for >3-6 months, impacting cross-shelf exchange and nutrient fluxes. The stationarity of the eddies is mainly due to the continental slope acting as a barrier, preventing cyclonic propagation.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
Qingyuan Yang, Guoping Zhu
Summary: This study investigated the feeding habits of the spiny icefish in the Bransfield Strait and used biochemical tracers to demonstrate the variability in its diet, which is influenced by the availability of krill and the dynamic hydrography. The results highlight the potential of biochemical tracers in reflecting changes in prey's diet in a highly dynamic environment.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
Andreana Cadaillon, Clara M. Iachetti, Ricardo Giesecke, Valeska Vasquez Lepio, Andrea Malits, Irene R. Schloss
Summary: A joint Chilean-Argentinian research cruise in the Beagle Channel revealed spatial and temporal heterogeneity of plankton abundance and composition. Plankton assemblages varied with bathymetry, water temperature, and nutrient availability. The easternmost sector of the channel had the highest total cell abundances and a diverse mix of small and large diatoms.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
Barbara P. Paiva, Carlos A. F. Schettini, Eduardo Siegle
Summary: The Sao Francisco River is an important river in Brazil, crossing the semi-arid region. A series of dams have been built along the river for hydropower, changing the flow significantly. A hydrodynamic model was used to simulate the effects of flow changes on saline intrusion in the estuary. The simulations showed an increase in mixing and decrease in river contribution after the dams were built. The results can be used by management agencies to improve water quality for human consumption.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
Xu Dong, Di Qi, Baohong Chen, Yingxu Wu, Xinqing Zheng, Hui Lin
Summary: Seasonal-scale local forcings reduce coastal pH and aragonite saturation state. The dynamics of carbonate system parameters were investigated in a coral habitat influenced by seasonal current patterns. Both Oaragonite and pH showed seasonal variations, controlled by dissolved inorganic carbon (DIC) and temperature. Ocean acidification scenarios projected a decrease in Oaragonite amplitude and an increase in hydrogen ion concentration ([H+]) amplitude.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
Roman Cieslinski, Izabela Chlost, Michal Szydlowski
Summary: The Vistula Lagoon, one of the two lagoons on the Polish coast, is economically and environmentally significant. This study aims to calculate the water balance of the lagoon before and after the construction of a canal through the Vistula Spit. The construction of the new connection may impact the lagoon's water balance and its biotic and abiotic environment. Data on precipitation, evaporation, inflow from the catchment, and inflow/outflow through the Strait of Baltiysk were collected for mathematical modeling. The study suggests that the construction of the new canal will not significantly alter the lagoon's water balance but may cause environmental problems.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
F. P. Brandini, A. M. Silver, A. Gangopadhyay
Summary: We demonstrate that wind-driven Ekman transport enhances the advection and mixing of cells, leading to the transport of colder water from the Surface Antarctic Waters to the warmer waters of the northern Polar Front belt. This mechanism provides cells with a favorable temperature environment, allowing for specific species and community growth rates to develop blooms under non-light limiting macronutrients and iron conditions. Our findings have important implications for increased productivity in a future warming climate.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
John E. Garzon-Cardona, Ana M. Martinez, Boris P. Koch, Bernd Krock, Elbio D. Palma, Xianyu Kong, Ruben J. Lara
Summary: This study aimed to gain a better understanding of the role of dissolved organic matter (DOM) in the biogeochemistry of the Southern Patagonian shelf. The results showed that terrigenous input is the main source of ammonium and refractory carbon in the region, while the Antarctic Circumpolar Current contributes autochthonous DOM. Additionally, regeneration processes of nitrogen-rich water were found in the Tierra del Fuego Waters and Grande Bay regions.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Geosciences, Multidisciplinary
Manoranjan Mishra, Tamoghna Acharyya, Bijay Halder, Celso Augusto Guimara Santos, Richarde Marques da Silva, Nihar Ranjan Rout, Debdeep Bhattacharyya
Summary: This study comprehensively analyzes the impacts of Tropical Cyclone Yaas on the mangrove forest in Bhitarkanika National Park, revealing significant ecosystem loss and changes in vegetation vigor and soil conditions, particularly an increase in salinity.
JOURNAL OF MARINE SYSTEMS
(2024)