Articles | Volume 10, issue 9
https://doi.org/10.5194/bg-10-5947-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-10-5947-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
11 Sep 2013
Research article |
| 11 Sep 2013
Distribution of ultraphytoplankton in the western part of the North Pacific subtropical gyre during a strong La Niña condition: relationship with the hydrological conditions
M. Girault
Department of Ocean Sciences, Tokyo University of Marine Science and Technology, 5–7 Konan 4, Minato-ku, Tokyo 108-8477, Japan
H. Arakawa
Department of Ocean Sciences, Tokyo University of Marine Science and Technology, 5–7 Konan 4, Minato-ku, Tokyo 108-8477, Japan
A. Barani
Aix-Marseille Université, Mediterranean institute of oceanography MIO UM110, Université du Sud Toulon-Var, CNRS/INSU IRD, 13288, Marseille, cedex 09, France
H. J. Ceccaldi
Aix-Marseille Université, Mediterranean institute of oceanography MIO UM110, Université du Sud Toulon-Var, CNRS/INSU IRD, 13288, Marseille, cedex 09, France
F. Hashihama
Department of Ocean Sciences, Tokyo University of Marine Science and Technology, 5–7 Konan 4, Minato-ku, Tokyo 108-8477, Japan
S. Kinouchi
Department of Ocean Sciences, Tokyo University of Marine Science and Technology, 5–7 Konan 4, Minato-ku, Tokyo 108-8477, Japan
G. Gregori
Aix-Marseille Université, Mediterranean institute of oceanography MIO UM110, Université du Sud Toulon-Var, CNRS/INSU IRD, 13288, Marseille, cedex 09, France
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Christian Lønborg, Cátia Carreira, Gwenaël Abril, Susana Agustí, Valentina Amaral, Agneta Andersson, Javier Arístegui, Punyasloke Bhadury, Mariana B. Bif, Alberto V. Borges, Steven Bouillon, Maria Ll. Calleja, Luiz C. Cotovicz Jr., Stefano Cozzi, Maryló Doval, Carlos M. Duarte, Bradley Eyre, Cédric G. Fichot, E. Elena García-Martín, Alexandra Garzon-Garcia, Michele Giani, Rafael Gonçalves-Araujo, Renee Gruber, Dennis A. Hansell, Fuminori Hashihama, Ding He, Johnna M. Holding, William R. Hunter, J. Severino P. Ibánhez, Valeria Ibello, Shan Jiang, Guebuem Kim, Katja Klun, Piotr Kowalczuk, Atsushi Kubo, Choon-Weng Lee, Cláudia B. Lopes, Federica Maggioni, Paolo Magni, Celia Marrase, Patrick Martin, S. Leigh McCallister, Roisin McCallum, Patricia M. Medeiros, Xosé Anxelu G. Morán, Frank E. Muller-Karger, Allison Myers-Pigg, Marit Norli, Joanne M. Oakes, Helena Osterholz, Hyekyung Park, Maria Lund Paulsen, Judith A. Rosentreter, Jeff D. Ross, Digna Rueda-Roa, Chiara Santinelli, Yuan Shen, Eva Teira, Tinkara Tinta, Guenther Uher, Masahide Wakita, Nicholas Ward, Kenta Watanabe, Yu Xin, Youhei Yamashita, Liyang Yang, Jacob Yeo, Huamao Yuan, Qiang Zheng, and Xosé Antón Álvarez-Salgado
Earth Syst. Sci. Data, 16, 1107–1119, https://doi.org/10.5194/essd-16-1107-2024, https://doi.org/10.5194/essd-16-1107-2024, 2024
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In this paper, we present the first edition of a global database compiling previously published and unpublished measurements of dissolved organic matter (DOM) collected in coastal waters (CoastDOM v1). Overall, the CoastDOM v1 dataset will be useful to identify global spatial and temporal patterns and to facilitate reuse in studies aimed at better characterizing local biogeochemical processes and identifying a baseline for modelling future changes in coastal waters.
Tsukasa Dobashi, Yuzo Miyazaki, Eri Tachibana, Kazutaka Takahashi, Sachiko Horii, Fuminori Hashihama, Saori Yasui-Tamura, Yoko Iwamoto, Shu-Kuan Wong, and Koji Hamasaki
Biogeosciences, 20, 439–449, https://doi.org/10.5194/bg-20-439-2023, https://doi.org/10.5194/bg-20-439-2023, 2023
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Water-soluble organic nitrogen (WSON) in marine aerosols is important for biogeochemical cycling of bioelements. Our shipboard measurements suggested that reactive nitrogen produced and exuded by nitrogen-fixing microorganisms in surface seawater likely contributed to the formation of WSON aerosols in the subtropical North Pacific. This study provides new implications for the role of marine microbial activity in the formation of WSON aerosols in the ocean surface.
Fuminori Hashihama, Hiroaki Saito, Taketoshi Kodama, Saori Yasui-Tamura, Jota Kanda, Iwao Tanita, Hiroshi Ogawa, E. Malcolm S. Woodward, Philip W. Boyd, and Ken Furuya
Biogeosciences, 18, 897–915, https://doi.org/10.5194/bg-18-897-2021, https://doi.org/10.5194/bg-18-897-2021, 2021
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We investigated the nutrient assimilation characteristics of deep-water-induced phytoplankton blooms across the subtropical North and South Pacific Ocean. Nutrient drawdown ratios of dissolved inorganic nitrogen to phosphate were anomalously low in the western North Pacific, likely due to the high phosphate uptake capability of low-phosphate-adapted phytoplankton. The anomalous phosphate uptake might influence the maintenance of chronic phosphate depletion in the western North Pacific.
Kahina Djaoudi, France Van Wambeke, Aude Barani, Nagib Bhairy, Servanne Chevaillier, Karine Desboeufs, Sandra Nunige, Mohamed Labiadh, Thierry Henry des Tureaux, Dominique Lefèvre, Amel Nouara, Christos Panagiotopoulos, Marc Tedetti, and Elvira Pulido-Villena
Biogeosciences, 17, 6271–6285, https://doi.org/10.5194/bg-17-6271-2020, https://doi.org/10.5194/bg-17-6271-2020, 2020
Sayako Ueda, Kazuo Osada, Keiichiro Hara, Masanori Yabuki, Fuminori Hashihama, and Jota Kanda
Atmos. Chem. Phys., 18, 9207–9224, https://doi.org/10.5194/acp-18-9207-2018, https://doi.org/10.5194/acp-18-9207-2018, 2018
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We investigated mixing states and morphological features of soot-containing particles, by using water-dialysis analysis in remote ocean areas over the southern Indian Ocean and the Southern Ocean. Most particles were water-soluble. However, rarely were particles (2.1 % of particles on a TEM sample at a maximum) found to contain insoluble residuals with the characteristic soot shape.
France Van Wambeke, Ulrike Pfreundt, Aude Barani, Hugo Berthelot, Thierry Moutin, Martine Rodier, Wolfgang R. Hess, and Sophie Bonnet
Biogeosciences, 13, 3187–3202, https://doi.org/10.5194/bg-13-3187-2016, https://doi.org/10.5194/bg-13-3187-2016, 2016
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The phytoplankton is at the base of the plankton food web in large parts of oceanic "deserts" such as the South Pacific Ocean, where nitrogen sources limit activity. Mesocosms were fertilized with phosphorus to stimulate diazotrophy (atmospheric N2 fixation). Mostly diazotroph-derived nitrogen fuelled the heterotrophic bacterial community through indirect processes generating dissolved organic matter and detritus, such as mortality, lysis and grazing of both diazotrophs and non-diazotrophs.
T. Shiozaki, S. Takeda, S. Itoh, T. Kodama, X. Liu, F. Hashihama, and K. Furuya
Biogeosciences, 12, 6931–6943, https://doi.org/10.5194/bg-12-6931-2015, https://doi.org/10.5194/bg-12-6931-2015, 2015
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The high abundance of Trichodesmium and active nitrogen fixation in the Kuroshio were not explained by the nutrient (nitrate, phosphate, and iron) distribution. We observed a Trichodesmium bloom and high nitrogen fixation near islands situated along the Kuroshio. Numerical particle-tracking experiments simulated the transportation of water around the Ryukyu Islands to the Kuroshio. Our results indicate that Trichodesmium growing around the Ryukyu Islands could be advected into the Kuroshio.
M. Girault, H. Arakawa, A. Barani, H. J. Ceccaldi, F. Hashihama, and G. Gregori
Biogeosciences, 12, 3607–3621, https://doi.org/10.5194/bg-12-3607-2015, https://doi.org/10.5194/bg-12-3607-2015, 2015
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This study focuses on the distribution of three heterotrophic prokaryote groups in relation to the environmental conditions met in the western part of NPSG. Our results showed that the high variability between the various heterotrophic prokaryote cluster abundances depend both on the mesoscale structures and the oligotrophic gradient. To the best of our knowledge, this study is the first report of the heterotrophic prokaryotes distribution under La Niña conditions in the western part of NPSG.
M. Sato, R. Sakuraba, and F. Hashihama
Biogeosciences, 10, 7677–7688, https://doi.org/10.5194/bg-10-7677-2013, https://doi.org/10.5194/bg-10-7677-2013, 2013
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Biogeosciences, 20, 3509–3521, https://doi.org/10.5194/bg-20-3509-2023, https://doi.org/10.5194/bg-20-3509-2023, 2023
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Oxygen availability in marine water and freshwater is very variable at daily and seasonal scales. The dynamic nature of oxygen fluctuations has important consequences for animal and microbe physiology and ecology, yet it is not fully understood. In this paper, we showed the heterogeneous nature of the aquatic oxygen landscape, which we defined here as the
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Anne L. Morée, Tayler M. Clarke, William W. L. Cheung, and Thomas L. Frölicher
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Markus A. Min, David M. Needham, Sebastian Sudek, Nathan Kobun Truelove, Kathleen J. Pitz, Gabriela M. Chavez, Camille Poirier, Bente Gardeler, Elisabeth von der Esch, Andrea Ludwig, Ulf Riebesell, Alexandra Z. Worden, and Francisco P. Chavez
Biogeosciences, 20, 1277–1298, https://doi.org/10.5194/bg-20-1277-2023, https://doi.org/10.5194/bg-20-1277-2023, 2023
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Wojciech Majewski, Witold Szczuciński, and Andrew J. Gooday
Biogeosciences, 20, 523–544, https://doi.org/10.5194/bg-20-523-2023, https://doi.org/10.5194/bg-20-523-2023, 2023
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We studied foraminifera living in the fjords of South Georgia, a sub-Antarctic island sensitive to climate change. As conditions in water and on the seafloor vary, different associations of these microorganisms dominate far inside, in the middle, and near fjord openings. Assemblages in inner and middle parts of fjords are specific to South Georgia, but they may become widespread with anticipated warming. These results are important for interpretating fossil records and monitoring future change.
Allanah Joy Paul, Lennart Thomas Bach, Javier Arístegui, Elisabeth von der Esch, Nauzet Hernández-Hernández, Jonna Piiparinen, Laura Ramajo, Kristian Spilling, and Ulf Riebesell
Biogeosciences, 19, 5911–5926, https://doi.org/10.5194/bg-19-5911-2022, https://doi.org/10.5194/bg-19-5911-2022, 2022
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We investigated how different deep water chemistry and biology modulate the response of surface phytoplankton communities to upwelling in the Peruvian coastal zone. Our results show that the most influential drivers were the ratio of inorganic nutrients (N : P) and the microbial community present in upwelling source water. These led to unexpected and variable development in the phytoplankton assemblage that could not be predicted by the amount of inorganic nutrients alone.
Hanna M. Kauko, Philipp Assmy, Ilka Peeken, Magdalena Różańska-Pluta, Józef M. Wiktor, Gunnar Bratbak, Asmita Singh, Thomas J. Ryan-Keogh, and Sebastien Moreau
Biogeosciences, 19, 5449–5482, https://doi.org/10.5194/bg-19-5449-2022, https://doi.org/10.5194/bg-19-5449-2022, 2022
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This article studies phytoplankton (microscopic
plantsin the ocean capable of photosynthesis) in Kong Håkon VII Hav in the Southern Ocean. Different species play different roles in the ecosystem, and it is therefore important to assess the species composition. We observed that phytoplankton blooms in this area are formed by large diatoms with strong silica armors, which can lead to high silica (and sometimes carbon) export to depth and be important prey for krill.
Chloe Carbonne, Steeve Comeau, Phoebe T. W. Chan, Keyla Plichon, Jean-Pierre Gattuso, and Núria Teixidó
Biogeosciences, 19, 4767–4777, https://doi.org/10.5194/bg-19-4767-2022, https://doi.org/10.5194/bg-19-4767-2022, 2022
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For the first time, our study highlights the synergistic effects of a 9-month warming and acidification combined stress on the early life stages of a Mediterranean azooxanthellate coral, Astroides calycularis. Our results predict a decrease in dispersion, settlement, post-settlement linear extention, budding and survival under future global change and that larvae and recruits of A. calycularis are stages of interest for this Mediterranean coral resistance, resilience and conservation.
Iris E. Hendriks, Anna Escolano-Moltó, Susana Flecha, Raquel Vaquer-Sunyer, Marlene Wesselmann, and Núria Marbà
Biogeosciences, 19, 4619–4637, https://doi.org/10.5194/bg-19-4619-2022, https://doi.org/10.5194/bg-19-4619-2022, 2022
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Seagrasses are marine plants with the capacity to act as carbon sinks due to their high primary productivity, using carbon for growth. This capacity can play a key role in climate change mitigation. We compiled and published data showing that two Mediterranean seagrass species have different metabolic rates, while the study method influences the rates of the measurements. Most communities act as carbon sinks, while the western basin might be more productive than the eastern Mediterranean.
Raúl Tapia, Sze Ling Ho, Hui-Yu Wang, Jeroen Groeneveld, and Mahyar Mohtadi
Biogeosciences, 19, 3185–3208, https://doi.org/10.5194/bg-19-3185-2022, https://doi.org/10.5194/bg-19-3185-2022, 2022
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We report census counts of planktic foraminifera in depth-stratified plankton net samples off Indonesia. Our results show that the vertical distribution of foraminifera species routinely used in paleoceanographic reconstructions varies in hydrographically distinct regions, likely in response to food availability. Consequently, the thermal gradient based on mixed layer and thermocline dwellers also differs for these regions, suggesting potential implications for paleoceanographic reconstructions.
Ricardo González-Gil, Neil S. Banas, Eileen Bresnan, and Michael R. Heath
Biogeosciences, 19, 2417–2426, https://doi.org/10.5194/bg-19-2417-2022, https://doi.org/10.5194/bg-19-2417-2022, 2022
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In oceanic waters, the accumulation of phytoplankton biomass in winter, when light still limits growth, is attributed to a decrease in grazing as the mixed layer deepens. However, in coastal areas, it is not clear whether winter biomass can accumulate without this deepening. Using 21 years of weekly data, we found that in the Scottish coastal North Sea, the seasonal increase in light availability triggers the accumulation of phytoplankton biomass in winter, when light limitation is strongest.
Birgit Koehler, Mårten Erlandsson, Martin Karlsson, and Lena Bergström
Biogeosciences, 19, 2295–2312, https://doi.org/10.5194/bg-19-2295-2022, https://doi.org/10.5194/bg-19-2295-2022, 2022
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Understanding species richness patterns remains a challenge for biodiversity management. We estimated fish species richness over a coastal salinity gradient (3–32) with a method that allowed comparing data from various sources. Species richness was 3-fold higher at high vs. low salinity, and salinity influenced species’ habitat preference, mobility and feeding type. If climate change causes upper-layer freshening of the Baltic Sea, further shifts along the identified patterns may be expected.
Uri Obolski, Thomas Wichard, Alvaro Israel, Alexander Golberg, and Alexander Liberzon
Biogeosciences, 19, 2263–2271, https://doi.org/10.5194/bg-19-2263-2022, https://doi.org/10.5194/bg-19-2263-2022, 2022
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The algal genus Ulva plays a major role in coastal ecosystems worldwide and is a promising prospect as an seagriculture crop. A substantial hindrance to cultivating Ulva arises from sudden sporulation, leading to biomass loss. This process is not yet well understood. Here, we characterize the dynamics of Ulva growth, considering the potential impact of sporulation inhibitors, using a mathematical model. Our findings are an essential step towards understanding the dynamics of Ulva growth.
Emanuela Fanelli, Samuele Menicucci, Sara Malavolti, Andrea De Felice, and Iole Leonori
Biogeosciences, 19, 1833–1851, https://doi.org/10.5194/bg-19-1833-2022, https://doi.org/10.5194/bg-19-1833-2022, 2022
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Zooplankton play a key role in marine ecosystems, forming the base of the marine food web and a link between primary producers and higher-order consumers, such as fish. This aspect is crucial in the Adriatic basin, one of the most productive and overexploited areas of the Mediterranean Sea. A better understanding of community and food web structure and their response to water mass changes is essential under a global warming scenario, as zooplankton are sensitive to climate change.
Masaya Yoshikai, Takashi Nakamura, Rempei Suwa, Sahadev Sharma, Rene Rollon, Jun Yasuoka, Ryohei Egawa, and Kazuo Nadaoka
Biogeosciences, 19, 1813–1832, https://doi.org/10.5194/bg-19-1813-2022, https://doi.org/10.5194/bg-19-1813-2022, 2022
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This study presents a new individual-based vegetation model to investigate salinity control on mangrove productivity. The model incorporates plant hydraulics and tree competition and predicts unique and complex patterns of mangrove forest structures that vary across soil salinity gradients. The presented model does not hold an empirical expression of salinity influence on productivity and thus may provide a better understanding of mangrove forest dynamics in future climate change.
Coulson A. Lantz, William Leggat, Jessica L. Bergman, Alexander Fordyce, Charlotte Page, Thomas Mesaglio, and Tracy D. Ainsworth
Biogeosciences, 19, 891–906, https://doi.org/10.5194/bg-19-891-2022, https://doi.org/10.5194/bg-19-891-2022, 2022
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Coral bleaching events continue to drive the degradation of coral reefs worldwide. In this study we measured rates of daytime coral reef community calcification and photosynthesis during a reef-wide bleaching event. Despite a measured decline in coral health across several taxa, there was no change in overall daytime community calcification and photosynthesis. These findings highlight potential limitations of these community-level metrics to reflect actual changes in coral health.
Hyewon Heather Kim, Jeff S. Bowman, Ya-Wei Luo, Hugh W. Ducklow, Oscar M. Schofield, Deborah K. Steinberg, and Scott C. Doney
Biogeosciences, 19, 117–136, https://doi.org/10.5194/bg-19-117-2022, https://doi.org/10.5194/bg-19-117-2022, 2022
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Heterotrophic marine bacteria are tiny organisms responsible for taking up organic matter in the ocean. Using a modeling approach, this study shows that characteristics (taxonomy and physiology) of bacteria are associated with a subset of ecological processes in the coastal West Antarctic Peninsula region, a system susceptible to global climate change. This study also suggests that bacteria will become more active, in particular large-sized cells, in response to changing climates in the region.
Alice E. Webb, Didier M. de Bakker, Karline Soetaert, Tamara da Costa, Steven M. A. C. van Heuven, Fleur C. van Duyl, Gert-Jan Reichart, and Lennart J. de Nooijer
Biogeosciences, 18, 6501–6516, https://doi.org/10.5194/bg-18-6501-2021, https://doi.org/10.5194/bg-18-6501-2021, 2021
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The biogeochemical behaviour of shallow reef communities is quantified to better understand the impact of habitat degradation and species composition shifts on reef functioning. The reef communities investigated barely support reef functions that are usually ascribed to conventional coral reefs, and the overall biogeochemical behaviour is found to be similar regardless of substrate type. This suggests a decrease in functional diversity which may therefore limit services provided by this reef.
Emmanuel Devred, Andrea Hilborn, and Cornelia Elizabeth den Heyer
Biogeosciences, 18, 6115–6132, https://doi.org/10.5194/bg-18-6115-2021, https://doi.org/10.5194/bg-18-6115-2021, 2021
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A theoretical model of grey seal seasonal abundance on Sable Island (SI) coupled with chlorophyll-a concentration [chl-a] measured by satellite revealed the impact of seal nitrogen fertilization on the surrounding waters of SI, Canada. The increase in seals from about 100 000 in 2003 to about 360 000 in 2018 during the breeding season is consistent with an increase in [chl-a] leeward of SI. The increase in seal abundance explains 8 % of the [chl-a] increase.
Julie Meilland, Michael Siccha, Maike Kaffenberger, Jelle Bijma, and Michal Kucera
Biogeosciences, 18, 5789–5809, https://doi.org/10.5194/bg-18-5789-2021, https://doi.org/10.5194/bg-18-5789-2021, 2021
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Planktonic foraminifera population dynamics has long been assumed to be controlled by synchronous reproduction and ontogenetic vertical migration (OVM). Due to contradictory observations, this concept became controversial. We here test it in the Atlantic ocean for four species of foraminifera representing the main clades. Our observations support the existence of synchronised reproduction and OVM but show that more than half of the population does not follow the canonical trajectory.
Federica Maggioni, Mireille Pujo-Pay, Jérome Aucan, Carlo Cerrano, Barbara Calcinai, Claude Payri, Francesca Benzoni, Yves Letourneur, and Riccardo Rodolfo-Metalpa
Biogeosciences, 18, 5117–5140, https://doi.org/10.5194/bg-18-5117-2021, https://doi.org/10.5194/bg-18-5117-2021, 2021
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Based on current experimental evidence, climate change will affect up to 90 % of coral reefs worldwide. The originality of this study arises from our recent discovery of an exceptional study site where environmental conditions (temperature, pH, and oxygen) are even worse than those forecasted for the future.
While these conditions are generally recognized as unfavorable for marine life, we found a rich and abundant coral reef thriving under such extreme environmental conditions.
Nisan Sariaslan and Martin R. Langer
Biogeosciences, 18, 4073–4090, https://doi.org/10.5194/bg-18-4073-2021, https://doi.org/10.5194/bg-18-4073-2021, 2021
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Analyses of foraminiferal assemblages from the Mamanguape mangrove estuary (northern Brazil) revealed highly diverse, species-rich, and structurally complex biotas. The atypical fauna resembles shallow-water offshore assemblages and are interpreted to be the result of highly saline ocean waters penetrating deep into the estuary. The findings contrast with previous studies, have implications for the fossil record, and provide novel perspectives for reconstructing mangrove environments.
Jutta E. Wollenburg, Jelle Bijma, Charlotte Cremer, Ulf Bickmeyer, and Zora Mila Colomba Zittier
Biogeosciences, 18, 3903–3915, https://doi.org/10.5194/bg-18-3903-2021, https://doi.org/10.5194/bg-18-3903-2021, 2021
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Cultured at in situ high-pressure conditions Cibicides and Cibicidoides taxa develop lasting ectoplasmic structures that cannot be retracted or resorbed. An ectoplasmic envelope surrounds their test and may protect the shell, e.g. versus carbonate aggressive bottom water conditions. Ectoplasmic roots likely anchor the specimens in areas of strong bottom water currents, trees enable them to elevate themselves above ground, and twigs stabilize and guide the retractable pseudopodial network.
Kumar Nimit
Biogeosciences, 18, 3631–3635, https://doi.org/10.5194/bg-18-3631-2021, https://doi.org/10.5194/bg-18-3631-2021, 2021
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The Indian Ocean Rim hosts many of the underdeveloped and emerging economies that depend on ocean resources for the livelihood of millions. Operational ocean information services cater to the requirements of resource managers and end-users to efficiently harness resources, mitigate threats and ensure safety. This paper outlines existing tools and explores the ongoing research that has the potential to convert the findings into operational services in the near- to midterm.
Finn Mielck, Rune Michaelis, H. Christian Hass, Sarah Hertel, Caroline Ganal, and Werner Armonies
Biogeosciences, 18, 3565–3577, https://doi.org/10.5194/bg-18-3565-2021, https://doi.org/10.5194/bg-18-3565-2021, 2021
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Marine sand mining is becoming more and more important to nourish fragile coastlines that face global change. We investigated the largest sand extraction site in the German Bight. The study reveals that after more than 35 years of mining, the excavation pits are still detectable on the seafloor while the sediment composition has largely changed. The organic communities living in and on the seafloor were strongly decimated, and no recovery is observable towards previous conditions.
France Van Wambeke, Elvira Pulido, Philippe Catala, Julie Dinasquet, Kahina Djaoudi, Anja Engel, Marc Garel, Sophie Guasco, Barbara Marie, Sandra Nunige, Vincent Taillandier, Birthe Zäncker, and Christian Tamburini
Biogeosciences, 18, 2301–2323, https://doi.org/10.5194/bg-18-2301-2021, https://doi.org/10.5194/bg-18-2301-2021, 2021
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Michaelis–Menten kinetics were determined for alkaline phosphatase, aminopeptidase and β-glucosidase in the Mediterranean Sea. Although the ectoenzymatic-hydrolysis contribution to heterotrophic prokaryotic needs was high in terms of N, it was low in terms of C. This study points out the biases in interpretation of the relative differences in activities among the three tested enzymes in regard to the choice of added concentrations of fluorogenic substrates.
Oscar E. Romero, Simon Ramondenc, and Gerhard Fischer
Biogeosciences, 18, 1873–1891, https://doi.org/10.5194/bg-18-1873-2021, https://doi.org/10.5194/bg-18-1873-2021, 2021
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Upwelling intensity along NW Africa varies on the interannual to decadal timescale. Understanding its changes is key for the prediction of future changes of CO2 sequestration in the northeastern Atlantic. Based on a multiyear (1988–2009) sediment trap experiment at the site CBmeso, fluxes and the species composition of the diatom assemblage are presented. Our data help in establishing the scientific basis for forecasting and modeling future states of this ecosystem and its decadal changes.
Katharine T. Bigham, Ashley A. Rowden, Daniel Leduc, and David A. Bowden
Biogeosciences, 18, 1893–1908, https://doi.org/10.5194/bg-18-1893-2021, https://doi.org/10.5194/bg-18-1893-2021, 2021
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Turbidity flows – underwater avalanches – are large-scale physical disturbances believed to have profound impacts on productivity and diversity of benthic communities in the deep sea. We reviewed published studies and found that current evidence for changes in productivity is ambiguous at best, but the influence on regional and local diversity is clearer. We suggest study design criteria that may lead to a better understanding of large-scale disturbance effects on deep-sea benthos.
Phillip Williamson, Hans-Otto Pörtner, Steve Widdicombe, and Jean-Pierre Gattuso
Biogeosciences, 18, 1787–1792, https://doi.org/10.5194/bg-18-1787-2021, https://doi.org/10.5194/bg-18-1787-2021, 2021
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The reliability of ocean acidification research was challenged in early 2020 when a high-profile paper failed to corroborate previously observed impacts of high CO2 on the behaviour of coral reef fish. We now know the reason why: the
replicatedstudies differed in many ways. Open-minded and collaborative assessment of all research results, both negative and positive, remains the best way to develop process-based understanding of the impacts of ocean acidification on marine organisms.
Michael Lintner, Bianca Lintner, Wolfgang Wanek, Nina Keul, and Petra Heinz
Biogeosciences, 18, 1395–1406, https://doi.org/10.5194/bg-18-1395-2021, https://doi.org/10.5194/bg-18-1395-2021, 2021
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Foraminifera are unicellular marine organisms that play an important role in the marine element cycle. Changes of environmental parameters such as salinity or temperature have a significant impact on the faunal assemblages. Our experiments show that changes in salinity immediately influence the foraminiferal activity. Also the light regime has a significant impact on carbon or nitrogen processing in foraminifera which contain no kleptoplasts.
Michele Casini, Martin Hansson, Alessandro Orio, and Karin Limburg
Biogeosciences, 18, 1321–1331, https://doi.org/10.5194/bg-18-1321-2021, https://doi.org/10.5194/bg-18-1321-2021, 2021
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In the past 20 years the condition of the eastern Baltic cod has dropped, with large implications for the fishery. Our results show that simultaneously the cod population has moved deeper while low-oxygenated waters detrimental for cod growth have become shallower. Cod have thus dwelled more in detrimental waters, explaining the drop in its condition. This study, using long-term fish and hydrological monitoring data, evidences the impact of deoxygenation on fish biology and fishing.
Elizabeth D. LaBone, Kenneth A. Rose, Dubravko Justic, Haosheng Huang, and Lixia Wang
Biogeosciences, 18, 487–507, https://doi.org/10.5194/bg-18-487-2021, https://doi.org/10.5194/bg-18-487-2021, 2021
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The hypoxic zone is an area of low dissolved oxygen (DO) in the Gulf of Mexico. Fish can be killed by exposure to hypoxia and can be negatively impacted by exposure to low, nonlethal DO concentrations (sublethal DO). We found that high sublethal area resulted in higher exposure and DO variability had a small effect on exposure. There was a large variation in exposure among individuals, which when combined with spatial variability of DO, can result in an underestimation of exposure when averaged.
Svenja Reents, Peter Mueller, Hao Tang, Kai Jensen, and Stefanie Nolte
Biogeosciences, 18, 403–411, https://doi.org/10.5194/bg-18-403-2021, https://doi.org/10.5194/bg-18-403-2021, 2021
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By conducting a flooding experiment with two genotypes of the salt-marsh grass Elymus athericus, we show considerable differences in biomass response to flooding within the same species. As biomass production plays a major role in sedimentation processes and thereby salt-marsh accretion, we emphasise the importance of taking intraspecific differences into account when evaluating ecosystem resilience to accelerated sea level rise.
Cara Nissen and Meike Vogt
Biogeosciences, 18, 251–283, https://doi.org/10.5194/bg-18-251-2021, https://doi.org/10.5194/bg-18-251-2021, 2021
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Using a regional Southern Ocean ecosystem model, we find that the relative importance of Phaeocystis and diatoms at high latitudes is controlled by iron and temperature variability, with light levels controlling the seasonal succession in coastal areas. Yet, biomass losses via aggregation and grazing matter as well. We show that the seasonal succession of Phaeocystis and diatoms impacts the seasonality of carbon export fluxes with ramifications for nutrient cycling and food web dynamics.
Jiangtao Li, Lingyuan Gu, Shijie Bai, Jie Wang, Lei Su, Bingbing Wei, Li Zhang, and Jiasong Fang
Biogeosciences, 18, 113–133, https://doi.org/10.5194/bg-18-113-2021, https://doi.org/10.5194/bg-18-113-2021, 2021
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Few studies have focused on the particle-attached (PA) and free-living (FL) microbes of the deep ocean. Here we determined PA and FL microbial communities along depth profiles of the SCS. PA and FL fractions accommodated divergent microbial compositions, and most of them are potentially generalists with PA and FL dual lifestyles. A potential vertical connectivity between surface-specific microbes and those in the deep ocean was indicated, likely through microbial attachment to sinking particles.
Cited articles
Aoki, Y., Suga, T., and Hanawa, K.: Subsurface subtropical fronts of the North Pacific as inherent boundaries in the ventilated thermocline, J. Phys. Oceanogr., 32, 2299–2311, 2002.
Baltar, F., Aristegui, J., Gasol, J. M., Lekunberri, I., and Herndl, G. J.: Mesoscale eddies: 10 hotspots of prokaryotic activity and differential community structure in the ocean, ISME J., 4, 975–988, 2010.
Blanchot, J., Andre, J. M., Navarette, C., Neveux, J., and Radenac, M. H.: Picophytoplankton in the equatorial Pacific: vertical distributions in the warm pool and in the high nutrient low chlorophyll conditions, Deep-Sea Res. I, 48, 297–314, 2001.
Brzezinski, M. A.: The Si:C:N ratio of marine diatoms: interspecific variability and the effect of some environmental variables, J. Phycol., 21, 347–357, 1985.
Cailliau, C., Claustre, H., Vidussi F., Marie, D., and Vaulot, D.: Carbon biomass, and gross grotwth trates as estimates from C-14 pigment labelling, during photoacclimation in prochlorococcus CCMP 1378, Mar. Ecol.-Prog. Ser., 145, 209–221, 1996.
Campbell, J. W. and Yentsch, C. M.: Variance within homogeneous phytoplakton populations. 1 Theoritical framework for interpreting histograms, Cytometry, 10, 587–595, 1989.
Campbell, L. and Vaulot, D.: Photosynthetic picoplankton community structure in the subtropical North Pacific Ocean near Hawaii (Station ALOHA), Deep-Sea Res. I, 40, 2043–2060, 1993.
Campbell, L., Liu, H., Nolla, H. A., and Vaulot, D.: Annual variability of phytoplankton and bacteria in the subtropical North Pacific Ocean at the station ALOHA during the 1991-1994 ENSO event, Deep-Sea Res. I, 44, 167–192, 1997.
Caron, D. A., Dam, H. G., Kremer, P., Lessard, E. J., Madin, L. P., Malone, T. C., Napp, J. M., Peele, E. R., Roman, M. R., and Youngbluth, M. J.: The contribution of microorganisms to particulate carbon and nitrogen in surface waters of the Sargasso Sea near Bermuda, Deep-Sea Res. I, 42, 943–972, 1995.
Chang, Y. L. and Oey L. Y.: Interannual and seasonal variations of Kuroshio transport east of Taiwan inferred from 29 years of tide-gauge data, Geophys. Res. Lett., 38, L08603, https://doi.org/10.1029/2011GL047062, 2011.
Chu, P. C., Li, R., and You, X.: Northwest Pacific subtropical countercurrent on isopycnal surface in summer, Geophys. Res. Lett., 29, 1842, https://doi.org/10.1029/2002GL014831, 2002.
Church, M. J., Bjorkman, K. M., Karl, D. M., Saito, M. A., and Zehr J. P.: Regional distribution of nitrogen-fixing bacteria in the Pacific Ocean, Limnol. Oceanogr., 53, 63–77, 2008.
Cravatte, S., Delcroix, T., Zhang, D., McPhaden, M., and Leloup, J.: Observed freshening and warming of the western Pacific Warm Pool, Clim. Dynam., 33, 565–589, 2009.
Fernandez, C., Thyssen, M., and Denis, M.: Microbial community structure along 18° W (39° N–44.5° N) in the NE Atlantic in late summer 2001 (POMME Programme), J. Mar. Syst., 71, 46–62, 2008.
Garside, C.: A chemiluminescent technique for the determination of nanomolar concentrations of nitrate and nitrite in seawater, Mar. Chem., 11, 159–167, 1982.
Girault, M., Arakawa, H., and Hashihama, F.: Phosphorus stress of microphytoplankton community in the western subtropical North Pacific, J. Plankton Res., 35, 146–157, 2013.
Goericke, R. and Montoya, J. P.: Estimating the contribution of microalga taxa to chlorophyll a in the field-variations of pigment ratios under nutrient- and light-limited growth, Mar. Ecol.-Prog. Ser., 169, 97–112, 1998.
Gregori, G., Denis, M., Sgorbati, S., and Citterio, S.: Resolution of viable and membrane-compromised free bacteria in aquatic environments by flow cytometry, in: Curr. Protoc. Cytom., Chapter 11, Unit 11.15, https://doi.org/10.1002/0471142956.cy1115s23, 2003.
Hashihama, F. and Kanda, J.: Automated colorimetric determination of trace silicic acid in seawater by gas-segmented continuous flow analysis with a liquid waveguide capillary cell, La Mer, 47, 119–127, 2010.
Hashihama, F., Furuya, K., Kitajima, S., Takeda, S., Takemura, T., and Kanda, J.: Macro-scale exhaustion of surface phosphate by dinitrogen fixation in the western North Pacific, Geophys. Res. Lett., 36, L03610, https://doi.org/10.1029/2008GL036866, 2009.
Henriksen, P., Riemann, B., Kaas, H., Sorensen, H. M., and Sorensen, H. L.: Effects of nutrient-limitation and irradiance on marine phytoplankton pigments, J. Plankton Res., 24, 835–858, 2002.
Horimoto, N., Yamaguchi, Y., and Ishimaru, T.: The distribution of picophytoplankton across Kuroshio Current off the western Pacific coast of Japan, La Mer, 39, 181–195, 2001.
Kana, T. M. and Glibert, P. M.: Effect of irradiances up to 2000 μ Em−2 s−1 on marine Synechococcus WH7803. 1. Growth, Pigmentation, and cell composition, Deep-Sea Res., 34, 479–495, 1987.
Kashino, Y., España, N., Syamsudin, F., Richards, K. J., Jensen, T., Dutrieux, P., and Ishida, A.: Observations on the North equatorial current, Mindanao current, and Kuroshio current system during the 2006/07 El Niño and 2007/08 La Niña, J. Oceanogr., 65, 325–333, 2009.
Karayanni, H., Christaki, U., Van Wambeke, F., Denis, M., and Moutin, T.: Influence of ciliated protozoa and heterotrophic nanoflagellates on the fate of primary production in the northeast Atlantic Ocean, J. Geophys. Res., 110, C07S15, https://doi.org/10.1029/2004JC002602, 2005.
Karl, D. M.: A sea of change: biogeochemical variability in the North Pacific Subtropical Gyre, Ecosystems, 2, 181–214, 1999.
Karl, D. M. and Tien, G.: MAGIC: A sensitive and precise method for measuring dissolved phosphorus in aquatic environments, Limnol. Oceanogr., 37, 105–116, 1992.
Karl, D. M., Bidigare, R. R., and Letelier, R. M.: Long term changes in plankton community structure and productivity in the North Pacific Subtropical Gyre: The domain shift hypothesis, Deep-Sea Res. II, 48, 1449–1470, 2001.
Kim, Y. Y., Qu, T., Jensen, T., Miyama, T., Mitsudera, H., Kang, H.-W., and Ishida, A.: Seasonal and interannual variations of the North Equatorial Current bifurcation in a high-resolution OGCM, J. Geophys. Res., 109, C0350, https://doi.org/10.1029/2003JC002013, 2004.
Kimura, S., Inoue, T., and Sugimoto, T.: Fluctuation in the distribution of low-salinity water in the North Equatorial Current and its effect on the larval transport of the Japanese eel, Fish. Oceanogr., 10, 51–60, 2001.
Kitajima, S., Furuya, K., Hashihama, F., Takeda, S., and Kanda, J.: Latitudinal distribution of diazotrophs and their nitrogen fixation in the tropical and subtropical western North Pacific, Limnol. Oceanogr., 54, 537–547, 2009.
Kobashi, F., Mitsudera, H., and Xie, S. P.: Three subtropical fronts in the North Pacific: Observational evidence for mode water-induced subsurface frontogenesis. J. Geophys. Res., 111, C09033, https://doi.org/10.1029/2006JC003479, 2006.
Lasternas, S., Piedeleu, M., Sangrà, P., Duarte, C. M., and Agustí, S.: Forcing of dissolved organic carbon release by phytoplankton by anticyclonic mesoscale eddies in the subtropical NE Atlantic Ocean, Biogeosciences, 10, 2129–2143, https://doi.org/10.5194/bg-10-2129-2013, 2013.
Lebaron, P., Parthuisot, N., and Catala, P.: Comparison of blue nucleic acid dyes for flow cytometric enumeration of bacteria in aquatic systems, Appl. Environ. Microbiol., 64, 1725–1730, 1998.
Li, B., Karl, D. M., Letelier, R. M., and Church, M. J.: Size-dependent photosynthetic variability in the North Pacific Subtropical Gyre, Mar. Ecol.-Prog. Ser., 440, 27–40, 2011.
Lipkovich, L. I. and Smith, E. P.: Biplot and singular value decomposition macros for Excel\textsuperscript\textregistered, J. Stat. Softw., 7, 1–15, 2002.
Liu, Q.: Variation partitioning by partial redundancy analysis (RDA), Environmetrics, 8, 75–85, 1997.
Lukas, R. and Lindstrom, E.: The mixed layer of the western Equatorial Pacific Ocean, J. Geophys. Res., 96, 3343–3357, 1991.
Marañon, E., Behrenfeld, M. J., González, N., Mouriño, B., and Zubkov, M. V.: High variability of primary production in oligotrophic waters of the Atlantic Ocean: uncoupling from phytoplankton biomass and size structure, Mar. Ecol.-Prog. Ser., 257, 1–11, 2003.
Marie, D., Brussaard, C. P. D., Thyrhaug, R., Bratbak, G., and Vaulot, D.: Enumeration of marine viruses in culture and natural samples by flow cytometry, Appl. Environ. Microbiol., 65, 45–52, 1999.
Masotti, I., Moulin, C., Alvain, S., Bopp, L., Tagliabue, A., and Antoine, D.: Large-scale shifts in phytoplankton groups in the Equatorial Pacific during ENSO cycles, Biogeosciences, 8, 539–550, https://doi.org/10.5194/bg-8-539-2011, 2011.
Matsumoto, K. and Furuya, K.: Variations in phytoplankton dynamics and primary production associated with ENSO cycle in the western and central equatorial Pacific during 1994–2003, J. Geophys. Res., 116, C12042, https://doi.org/10.1029/2010JC006845, 2011.
Matsumoto, K., Furuya, K., and Kawano, T.: Association of picophytoplankton with ENSO events in the equatorial Pacific between 145° E and 160° W, Deep-Sea. Res. I, 51, 1851–1871, 2004.
Mella-Flores, D., Six, C., Ratin, M., Partensky, F., Boutte, C., Le Corguillé, G., Marie, D., Blot, N., Gourvil, P., Kolowrat, C., and Garczarek, L.: Prochlorococcus and Synechococcus have evolved different adaptive mechanisms to cope with light and UV stress, Front. Microbiol., 3, 285, https://doi.org/10.3389/fmicb.2012.00285, 2012.
Michelou, V. K.: Uptake of dissolved organic matter and phosphate by phototrophic and heterotrophic bacteria, PhD dissertation, University of Delaware, 149 pp., 2009.
Michelou, V. K., Lomas, M. W., and Kirchman, D. L.: Phosphate and adenosine-5´-triphosphate uptake by cyanobacteria and heterotrophic bacteria in the Sargasso Sea, Limnol. Oceanogr., 56, 323–332, 2011.
Moore, L. R., Goericke, R., and Chisholm, S. W.: Comparative physiology of Synechococcus and Prochlorococcus: influence of light and temperature on growth, pigments, fluorescence and absorptive properties, Mar. Ecol.-Prog. Ser., 116, 259–275, 1995.
Moutin, T., Thingstad, T. F., Van Wambeke, F., Marie, M., Slawyk, G., Raimbault, P., and Claustre, H.: Does competition for nanomolar phosphate supply explain the predominance of the cyanobacterium Synechococcus?, Limnol. Oceanogr., 47, 1562–1567, 2002.
Obayashi, Y., Tanoue, E., Suzuki, K., Handa, N., Nojiri, Y., and Wong, C. S.: Spatial and temporal variabilities of phytoplankton community structure in the Northern North Pacific as determined by phytoplankton pigment, Deep-Sea Res. I, 48, 439–469, 2001.
Oka, E.: Seasonal and interannual variation of North Pacific Subtropical Mode Water in 2003–2006, J. Phys. Oceanogr., 65, 151–164, 2009.
Olson, R. J., Chisholm, S. W., Zettlern, E. R., Altabet, M. A., and Dusenberry, J. A.: Spatial and temporal distributions of prochlorophyte picoplankton, Biochem. Physiol. Pflan., 167, 191–194, 1990.
Painchaud, J. and Therriault, J.-C.: Relationships between bacteria, phytoplankton and particulate organic carbon in the upper St. Lawrence estuary, Mar. Ecol.-Prog. Ser., 56, 301–311, 1989.
Partensky, F., Hess, W. R., and Vaulot, D.: Prochlorococcus, a marine photosynthetic Prokaryote of global significance, Microbiol. Mol. Biol. Rev., 63, 106–127, 1999.
Pearson, K.: On lines and planes of closest fit to systems of points in space, Philos. Mag., 2, 559–572, 1901.
Peterson, T. D., Crawford, D. W., and Harrison, P. J.: Evolution of the phytoplankton assemblage in a long-lived mesoscale eddy in the eastern Gulf of Alaska, Mar. Ecol.-Prog. Ser., 424, 53–73, 2011.
Qiu, B.: Seasonal eddy field modulation of the North Pacific Subtropical Countercurrent: TOPEX/Poseidon observations and theory, J. Phys. Oceanogr., 29, 2471–2486, 1999.
Qiu, B. and Chen, S.: Interannual variability of the North Pacific Subtropical Countercurrent and its associated mesoscale eddy field, J. Phys. Oceanogr., 40, 213–225, 2010.
Qiu, B. and Lukas, R.: Seasonal and interannual variability of the North Equatorial Current, the Mindanao Current, and the Kuroshio along the Pacific western boundary, J. Geophys. Res., 101, 12315–12330, 1996.
Richardson, T. L. and Jackson, G. A.: Small phytoplankton and carbon export from the surface ocean, Science, 315, 838–840, 2007.
Rii, Y. M., Brown, S. L., Nencioli, F., Kuwahara, V., Dickey, T., Karl, D. M., and Bidigare, R. R.: The transient oasis: Nutrient-phytoplankton dynamics and particle export in Hawaiian lee cyclones, Deep-Sea Res. II, 55, 1275–1290, 2008.
Rippka, R., Coursin, T., Hess, W., Lichte, C., Scalan, D. J., Palinska, K. A., Iteman, I., Partensky, F., Houmard, J., and Herdman, M.: Prochlorococcus marinus Chisholm et al. subsp. nov. pastoris, strain PCC9511, the first axenic chlorophyll a2/b2-containing cyanobacterium (Oxyphotobacteria), Int. J. Syst. Evol. Microbiol., 50, 1833–1847, 2000.
Rousseaux, C. S. and Gregg, W. W.: Climate variability and phytoplankton composition in the Pacific Ocean, J. Geophys. Res., 117, C10006, https://doi.org/10.1029/2012JC008083, 2012.
Sato, M., Hashihama, F., Kitajima, S., Takeda, S., and Furuya, K.: Distribution of nano-sized cyanobacteria in the western and central Pacific Ocean, Aquat. Microb. Ecol., 56, 273–282, 2010.
Sekine, Y. and Miyamoto, S.: Influence of Kuroshio flow on the horizontal distribution of north Pacific intermediate water in the Shikoku basin, J. Oceanogr., 58, 611–616, 2002.
Selmer, J.-S., Ferrier-Pages, C., Cellario, C., and Rassoulzadegan, F.: New and regenerated production in relation to the microbial loop in the NW Mediterranean Sea, Mar. Ecol.-Prog. Ser., 100, 71–83, 1993.
Shimada, A., Hasegawa, T., Umeda, I., Kadoya, N., and Maruyama, T.: Spatial mesoscale patterns of West Pacific picophytoplankton as analysed by flow cytometry: their contribution to subsurface chlorophyll maxima, Mar. Biol., 115, 209–215, 1993.
Sieracki, M. E., Haugen, E. M., and Cucci, T. L.: Overestimation of heterotrophic bacteria in the Sargasso Sea: direct evidence by flow and imaging cytometry, Deep-Sea Res. I, 42, 1399–1409, 1995.
Steinberg, D. K., Carlson, C. A., Bates, N. R., Johnson, R. J., Michaels, A. F., and Knap, A. F.: Overview of the U.S. JGOFS Bermuda Atlantic Time-series Study (BATS): A decade-scale look at ocean biology and biogeochemistry, Deep-Sea Res. II, 48, 1405–1447, 2001.
Suzuki, K., Handa, N., Kiyosawa, H., and Ishizaka, J.: Distribution of the prochlorophyte Prochlorococcus in the central Pacific Ocean as measured by HPLC, Limnol. Oceanogr., 40, 983–989, 1995.
Suzuki, K., Handa, N., Kiyosawa, H., and Ishizaka, J.: Temporal and spatial distribution of phytoplankton pigments in the central Pacific Ocean along 175° E during the Boreal Summers of 1992 and 1993, J. Oceanogr., 53, 383–396, 1997.
Thomson, R. E. and Fine, I. V.: Estimating mixed layer depth from oceanic profile data, J. Atmos. Ocean. Tech., 20, 319–329, 2003.
Thyssen, M., Lefèvre, D., Caniaux, G., Ras, J., Fernandez, C. F., and Denis, M.: Spatial distribution of heterotrophic bacteria in the northeast Atlantic (POMME study area) during spring 2001, J. Geophys. Res., 110, C07S16, https://doi.org/10.1029/2004JC002670, 2005.
Tomczak, M. and Godfrey, J. S.: Regional oceanography: an introduction, Pergamon Press, Oxford, 1994.
Vaillancourt, R. D., Marra, J., Seki, M. P., Parsons, M. L., and Bidigare, R. R.: Impact of a cyclonic eddy on phytoplankton community structure and photosynthetic competency in the subtropical North Pacific Ocean, Deep-Sea Res. I, 50, 829–847, 2003.
White, W. B., Hasunuma, K., and Solomon, H.: Large-scale seasonal and secular variability of the Subtropical Front in the western North Pacific from 1954 to 1974, J. Geophys. Res., 83, 4531–4544, 1978.
Xie, L., Tian, J., Hu, D., and Wang, F.: A quasi-synoptic interpretation of water mass distribution and circulation in the western North Pacific: I. Water mass distribution, Chin. J. Oceanol. Limnol., 27, 630–639, 2009.
Zehr, J. P., Waterbury, J. B., Turner, P. J., Montoya, J. P., Omoregie, E., Steward, G. F., Hansen, A., and Karl, D. M.: Unicellular cyanobacteria fix N2 in the subtropical North Pacific Ocean, Nature, 412, 635–638, 2001.
Zhang, Y., Jiao, N., and Hong, N.: Comparative study of picoplankton biomass and community structure in different provinces from subarctic to subtropical oceans, Deep-Sea Res. II, 55, 1605–1614, 2008.
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