Article
Environmental Sciences
Cara Nissen, Nicolas Gruber, Matthias Muennich, Meike Vogt
Summary: The study used a high-resolution model to analyze the important role of silicifying diatoms and calcifying coccolithophores in controlling nutrient levels and stoichiometry in the Southern Ocean. Results demonstrate that the efficient consumption and export of Si(OH)4 by diatoms, as well as the export of organic matter by coccolithophores, contribute to the control of biogeochemical processes in the Southern Ocean.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Environmental Sciences
Andres S. Rigual-Hernandez, Gerald Langer, Francisco Javier Sierro, Helen Bostock, Jose Manuel Sanchez-Santos, Scott Davidson Nodder, Tom W. Trull, Anne Marie Ballegeer, Andrew D. Moy, Ruth Eriksen, Laura Makowka, Thibauld M. Bejard, Francisco Henri Rigal-Munoz, Alberto Hernandez-Martin, Maria Zorita-Viota, Jose Abel Flores
Summary: The Subantarctic Zone of the Southern Ocean is crucial for the Earth system, but there is limited data on its ecosystems, hindering predictions of future response to climate change. This study reconstructs the state of a key phytoplankton species and finds that environmental factors, especially warming and ocean acidification, have led to a reduction in coccolith size. These findings have implications for the efficiency of the marine carbon cycle and suggest the potential use of coccolith size as a proxy for growth rate.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Vikki Lowe, Giuseppe Cortese, Kelly-Anne Lawler, Matthieu Civel-Mazens, Helen C. Bostock
Summary: The Southern Ocean is an important region for identifying ecoregions, and this study used the Southern Ocean Radiolarian Dataset to determine the radiolarian ecoregions in the Atlantic, Indian, and Southwest Pacific Sectors. The distribution of radiolarian species was found to be heterogeneous throughout the Southern Ocean, with each sector having its own unique group of ecoregions. This study highlights the importance of further exploring radiolarian ecology and being cautious when using radiolarian assemblage variability in paleo-environmental studies.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geochemistry & Geophysics
Yi-Wei Liu, Sebastian D. Rokitta, Bjorn Rost, Robert A. Eagle
Summary: This study investigated the carbon utilization and internal pH regulation of three calcareous coccolithophores cultured under different pCO(2) levels. The results show species-specific modes of pH control and differences in the utilization of inorganic carbon. The findings suggest a high plasticity in the utilization of dissolved inorganic carbon may explain species-specific differences in responses to ocean acidification.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Oceanography
Zuchuan Li, M. Susan Lozier, Nicolas Cassar
Summary: Mixed-layer dynamics have a significant impact on nutrient and light availability for phytoplankton in the Southern Ocean. The study highlights the complex relationship between mixed-layer dynamics and net community production (NCP) on various timescales, showing that NCP is influenced by mixed layer depth differently over intraseasonal, seasonal, and interannual scales.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Ecology
Joost de Vries, Fanny Monteiro, Glen Wheeler, Alex Poulton, Jelena Godrijan, Federica Cerino, Elisa Malinverno, Gerald Langer, Colin Brownlee
Summary: Coccolithophores are marine calcifying phytoplankton with a haplo-diplontic life cycle. Calcified haploid coccolithophores generally make up a small portion of the total population, but can be significant contributors under certain environmental conditions. The haploid and diploid life cycle phases occupy contrasting niches, allowing coccolithophores to expand their niche by approximately 18.8%.
Article
Environmental Sciences
Frank C. Olaya, Reginaldo Durazo, Vera Oerder, Enric Pallas-Sanz, Joaquim P. Bento
Summary: This study proposes a method to detect ocean fronts using in situ temperature and density glider measurements, showing consistent results with previous studies in the California Current System. The comparison of glider and MUR datasets reveals temperature's significant contribution to front detection.
Review
Microbiology
Diego J. Castillo, Choaro D. Dithugoe, Oliver K. Bezuidt, Thulani P. Makhalanyane
Summary: This study examines the microbial diversity and functionality in the Southern Ocean (SO), emphasizing the relationships between microbial communities and other trophic levels. The seasonal variations and characteristic features of the SO influence community composition and ecosystem functions. The study highlights the importance of abundant bacteria in recycling organic matter and discusses the effects of climate change on marine microbiota in the SO.
FEMS MICROBIOLOGY ECOLOGY
(2022)
Article
Geochemistry & Geophysics
Luz Maria Mejia, Stefano M. Bernasconi, Hongrui Zhang, Jose Guitian, Alvaro Fernandez, Ivan Hernandez-Almeida, Madalina Jaggi, Negar Haghipour, Heather Stoll
Summary: Reliable temperature reconstructions are necessary for improving climate reconstructions and comparing with paleoclimate model simulations. Most existing paleotemperature proxies are based on organic and inorganic remains of marine organisms. However, calibrations of proxies based on photosynthesizers often ignore the evidence that habitat depth of phytoplankton depends on their ability to balance light, nutrients, and grazing pressure.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geography, Physical
Shramik M. Patil, Rahul Mohan, Suhas S. Shetye, Vailancy Vaz, Sahina Gazi, Pallavi P. Choudhari, Syed A. Jafar
Summary: Studies show that in the Indian sector of the Southern Ocean, E. huxleyi exhibits different sizes and morphologies of coccoliths and coccospheres in different regions due to variations in ocean temperature, salinity, and nutrient concentrations.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geography, Physical
M. Civel-Mazens, X. Crosta, G. Cortese, E. Michel, A. Mazaud, O. Ther, M. Ikehara, T. Itaki
Summary: In the Southern Ocean, climate-driven latitudinal migrations of the Antarctic Circumpolar Current frontal system impact ocean circulation and primary productivity. The Antarctic Polar Front's migrations influence nutrient redistribution, biodiversity, and the soft tissue carbon pump in the modern Southern Ocean.
GLOBAL AND PLANETARY CHANGE
(2021)
Editorial Material
Multidisciplinary Sciences
James Crow, Zoleka Filander
Summary: Zoleka Filander is leading research in South African waters to protect vulnerable marine life and show respect to her Indigenous community.
Article
Geosciences, Multidisciplinary
Tobias Puettmann, Joerg Mutterlose
Summary: This study reports remarkably diverse fossil coccolithophore assemblages from Cenomanian-Campanian nearshore deposits characterized by a high degree of diversity, with lower absolute abundances but higher diversity indices compared to contemporaneous chalk samples.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Oceanography
Andre Valente, Jose C. B. da Silva, Vanda Brotas
Summary: In the western Iberian margin, two ocean color features were identified: a coastal band of high nLw555 due to wave-induced sediment resuspension, and offshore areas of high nLw555 attributed to coccolithophore blooms. These features were detected and separated in time, allowing for satellite monitoring of sediment resuspension and phytoplankton blooms in similar coastal environments.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Marine & Freshwater Biology
Naomi Villiot, Alex J. Poulton, Elizabeth T. Butcher, Lucie R. Daniels, Aimee Coggins
Summary: Coccolithophores, as photoautotrophs and calcifiers, play important roles in ecosystems and biogeochemical cycles. Low-latitude communities exhibit high diversity and niche diversification. Results show that coccolithophore cell size is constrained, growth rates scale with cell biovolume, and organic carbon content per cell is lower compared to other phytoplankton.
JOURNAL OF PLANKTON RESEARCH
(2021)
Article
Multidisciplinary Sciences
A. S. Rigual-Hernandez, T. W. Trull, J. A. Flores, S. D. Nodder, R. Eriksen, D. M. Davies, G. M. Hallegraeff, F. J. Sierro, S. M. Patil, A. Cortina, A. M. Ballegeer, L. C. Northcote, F. Abrantes, M. M. Rufino
SCIENTIFIC REPORTS
(2020)
Article
Geography, Physical
Dimitris Evangelinos, Carlota Escutia, Johan Etourneau, Frida Hoem, Peter Bijl, Wilrieke Boterblom, Tina van de Flierdt, Luis Valero, Jose-Abel Flores, Francisco J. Rodriguez-Tovar, Francisco J. Jimenez-Espejo, Ariadna Salabarnada, Adrian Lopez-Quiros
GLOBAL AND PLANETARY CHANGE
(2020)
Article
Environmental Sciences
A. S. Rigual-Hernandez, J. M. Sanchez-Santos, R. Eriksen, A. D. Moy, F. J. Sierro, J. A. Flores, F. Abrantes, H. Bostock, S. D. Nodder, A. Gonzalez-Lanchas, T. W. Trull
Article
Geosciences, Multidisciplinary
Maria H. Toyos, Frank Lamy, Carina B. Lange, Lester Lembke-Jene, Mariem Saavedra-Pellitero, Oliver Esper, Helge W. Arz
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2020)
Article
Geography, Physical
Alba Gonzalez-Lanchas, Jose-Abel Flores, Francisco J. Sierro, Maria Angeles Barcena, Andres S. Rigual-Hernandez, Dulce Oliveira, Lucia A. Azibeiro, Maria Marino, Patrizia Maiorano, Aleix Cortina, Isabel Cacho, Joan O. Grimalt
QUATERNARY SCIENCE REVIEWS
(2020)
Article
Geosciences, Multidisciplinary
Francisco J. Sierro, David A. Hodell, Nils Andersen, Lucia A. Azibeiro, Francisco J. Jimenez-Espejo, Andre Bahr, Jose Abel Flores, Blanca Ausin, Mike Rogerson, Rocio Lozano-Luz, Susana M. Lebreiro, Francisco Javier Hernandez-Molina
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2020)
Article
Environmental Sciences
Margot Courtillat, Maximilian Hallenberger, Maria-Angela Bassetti, Dominique Aubert, Catherine Jeandel, Lars Reuning, Chelsea Korpanty, Pierre Moissette, Stephanie Mounic, Mariem Saavedra-Pellitero
Article
Geosciences, Multidisciplinary
A. Gonzalez-Lanchas, J. -A. Flores, F. J. Sierro, M. F. Sanchez Goni, T. Rodrigues, B. Ausin, D. Oliveira, F. Naughton, M. Marino, P. Maiorano, B. Balestra
Summary: Primary productivity variations at the SW Iberian Margin are primarily controlled by wind-driven upwelling, with potential major changes influenced by atmospheric circulation and wind regimes. Studies have shown an increase in primary productivity during the interglacial MIS 11c, potentially driven by atmospheric NAO-like variability.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Geosciences, Multidisciplinary
A. Gonzalez-Lanchas, I Hernandez-Almeida, J-A Flores, F. J. Sierro, J. Guitian, H. M. Stoll
Summary: Understanding the sensitivity of coccolithophores to changing CO2 and its impact on cellular photosynthetic carbon isotopic fractionation is crucial for predicting future adaptations and past CO2 estimates. Measurement of epsilon(p) across glacial-interglacial CO2 variations showed significant correlation with CO2[aq] concentrations. The effects of non-CO2 factors on epsilon(p) cannot be fully explained by variations in cell size of Gephyrocapsa.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Environmental Sciences
Mariem Saavedra-Pellitero, Ivan Hernandez-Almeida, Eloy Cabarcos, Karl-Heinz Baumann, Tom Dunkley Jones, Francisco Javier Sierro, Jose-Abel Flores
Summary: We present a new high-resolution reconstruction of annual sea-surface temperatures and net primary productivity in the Eastern Equatorial Pacific (EEP). The addition of new samples improves the SST reconstruction, allowing for higher confidence in the results. The reconstructed NPP shows a general decreasing trend from the late last glacial period to recent times. These reconstructions provide key data for understanding the role of the EEP in global biogeochemical cycles.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Ecology
Nele Manon Vollmar, Karl-Heinz Baumann, Mariem Saavedra-Pellitero, Ivan Hernandez-Almeida
Summary: The Southern Ocean is undergoing significant changes that may impact the composition and distribution of pelagic plankton communities. This study investigates the (sub-)fossil coccolith assemblages preserved in surface sediments of southernmost Chile and the Drake Passage. The findings highlight the biodiversity and morphological diversity of coccoliths, emphasizing their response to changing environmental conditions.
Article
Environmental Sciences
Deborah Tangunan, Melissa A. Berke, Alejandra Cartagena-Sierra, Jose Abel Flores, Jens Gruetzner, Francisco Jimenez-Espejo, Leah J. LeVay, Karl-Heinz Baumann, Oscar Romero, Mariem Saavedra-Pellitero, Jason J. Coenen, Aidan Starr, Sidney R. Hemming, Ian R. Hall
Summary: The research found that the migration of the Subtropical Front in the Southern Indian Ocean during glacial and interglacial periods resulted in variability in the strength of the biological pump. Sedimentary records from the Agulhas Plateau show clear glacial-interglacial variability in sea surface temperature and productivity.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)
Article
Geosciences, Multidisciplinary
Raul Trejos-Tamayo, Felipe Vallejo, Viviana Arias, Claudia Garcia, Andres Pardo-Trujillo, Erika Bedoya, Jose-Abel Flores
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2020)
Article
Ecology
Andres S. Rigual Hernandez, Thomas W. Trull, Scott D. Nodder, Jose A. Flores, Helen Bostock, Fatima Abrantes, Ruth S. Eriksen, Francisco J. Sierro, Diana M. Davies, Anne-Marie Ballegeer, Miguel A. Fuertes, Lisa C. Northcote