Results 61 to 70 of about 113,928,681 (157)

High nitrogen fixation and Braarudosphaera presence in the North Sea

Limnology and Oceanography, Volume 71, Issue 3, March 2026.
Abstract Nitrogen fixation, the microbial conversion of dinitrogen gas to ammonia, is a key nitrogen source and critical for sustaining marine productivity. We investigated the diversity and activity of nitrogen‐fixers in surface waters of the North Sea and Norwegian coast during July 2023.
Kendra Turk‐Kubo, Claire Mahaffey, Jo Hopkins, Ruth Hawley, Louisa Norman, Lewis Wrightson, Ben Fisher, Stefanie Rynders, Clive Neil, Maryam Ilyas, Maeve C. Lohan   +10 more
wiley   +1 more source

Shown are all 760 genes (n_UCYN-A1 = 368, n_UCYN-A2 = 392) that were detected at both Stn. ALOHA and Scripps Pier.

, 2023
Axes are the standardized transcript levels (Methods) and the dashed reference lines indicate equal standardized transcript levels at both sites. Genes are above the reference lines which is consistent with the hypothesis that the coastal study favored ...
Jonathan D. Magasin (8735343), María del Carmen Muñoz-Marín (15389179), Jonathan P. Zehr (8735355)   +2 more
core   +1 more source

Succession within the prokaryotic communities during the VAHINE mesocosms experiment in the New Caledonia lagoon [PDF]

Biogeosciences, 2016
N2 fixation fuels  ∼  50 % of new primary production in the oligotrophic South Pacific Ocean. The VAHINE experiment has been designed to track the fate of diazotroph-derived nitrogen (DDN) and carbon within a coastal lagoon ecosystem in a comprehensive ...
U. Pfreundt, F. Van Wambeke, M. Caffin, S. Bonnet, W. R. Hess   +4 more
doaj   +1 more source

Surface Water Iron Deposition Histories and the Initiation of Phytoplankton Blooms in the North Pacific Subtropical Gyre

Global Biogeochemical Cycles, Volume 40, Issue 1, January 2026.
Abstract Highly productive summer phytoplankton blooms in the central North Pacific Subtropical Gyre (NPSG) are an annual occurrence that leads to the export of considerable amounts of surface particulate carbon to depth. The mechanisms that control the formation of these blooms remain unresolved, but iron (Fe) availability may be an important factor ...
Kyeong Pil Kong, Shun‐Chung Yang, Benedetto Barone, Douglas S. Hamilton, Seth G. John   +4 more
wiley   +1 more source

Spatiotemporal heterogeneity in diazotrophic communities reveals novel niche zonation on the continental shelf of the East China Sea [PDF]

Biogeosciences
The East China Sea (ECS) continental shelf is a hotspot for studying nitrogen fixation in the marginal seas of the western Pacific, where this microbially mediated process is profoundly influenced by both the coastal and oceanic current systems. Yet, how
G. Mai, H. Zhang, M. Chen, T. Shi
doaj   +1 more source

Subtropical seagrass epiphytes: Nitrogen fixation rates align with Crocosphaera‐like cyanobacteria abundances

Limnology and Oceanography, Volume 70, Issue 12, Page 3958-3971, December 2025.
Abstract Nitrogen fixers can enhance nitrogen availability for seagrass communities that may be nitrogen limited. However, the role of epiphytic diazotrophs, particularly cyanobacteria, in seagrass communities is not well understood. We measured nitrogen fixation rates, epiphyte biomass, and relative abundances of epiphytic diazotrophs on the leaves of
Lacey T. Bowman, Jane M. Caffrey, Lisa A. Waidner   +2 more
wiley   +1 more source

High Diazotrophic Diversity but Low N2 Fixation Activity in the Northern Benguela Upwelling System Confirming the Enigma of Nitrogen Fixation in Oxygen Minimum Zone Waters

Frontiers in Marine Science, 2022
Oxygen minimum zones (OMZs) have been suggested as a suitable niche for the oxygen-sensitive process of biological fixation of dinitrogen (N2) gas. However, most N2 fixation rates reported from such waters are low.
Christian Furbo Reeder, Damian L. Arévalo-Martínez, Damian L. Arévalo-Martínez, Joan A. Carreres-Calabuig, Tina Sanders, Nicole R. Posth, Carolin Regina Löscher, Carolin Regina Löscher   +7 more
doaj   +1 more source

From temperate to polar waters: Transition to non‐cyanobacterial diazotrophy upon entering the Atlantic gateway of the Arctic Ocean

Limnology and Oceanography, Volume 70, Issue 10, Page 2924-2940, October 2025.
Abstract Nitrogen fixation, the microbial reduction of dinitrogen to ammonia, is increasingly recognized to occur in the Arctic Ocean. However, knowledge about the composition, biogeography, abundance, and ecology of nitrogen‐fixing organisms (diazotrophs) is poor.
Lisa W. von Friesen, Christien P. Laber, Bjarke H. Kristensen, Emma Nysted, Marcus Sundbom, Stefan Bertilsson, Pauline Snoeijs‐Leijonmalm, Hanna Farnelid, Lasse Riemann   +8 more
wiley   +1 more source

UCYN-A3, a newly characterized open ocean sublineage of the symbiotic N2-fixing cyanobacterium Candidatus Atelocyanobacterium thalassa [PDF]

, 2018
The symbiotic unicellular cyanobacterium Candidatus Atelocyanobacterium thalassa (UCYN-A) is one of the most abundant and widespread nitrogen (N2)-fixing cyanobacteria in the ocean.
Acinas, Silvia G, Royo-Llonch, Marta, Cornejo Castillo, Francisco M., Zehr, Jonathan P, Muñoz-Marin, Maria del Carmen, Turk-Kubo, Kendra A., Farnelid, Hanna   +6 more
core  

Single-cell genomics reveals the genome content of the uncultured cyanobacterial diazotroph UCYN-A3

, 2023
ASLO Aquatic Sciences Meeting, Resilience and Recovery in Aquatic Systems, 4-9 June 2023, Palma de Mallorca, SpainThe unicellular cyanobacteria Candidatus Atelocyanobacterium thalassa (hereafter, UCYN-A) are important nitrogen fixers that live in ...
Garczarek, Laurence, Acinas, Silvia G., Sánchez-Baracaldo, Patricia, Cornejo-Castillo, Francisco M., Zehr, Jonathan P., Vieyra Mexicano, Cinthya, Wincker, Patrick, Bianchini, Giorgio   +7 more
core