Erin M. Bertrand

New Views on Cobalamin in Marine Microbial Ecosystems

Erin M. Bertrand, Catherine C. Bannon, Katherine E. Helliwell, Yoshiko Kondo et autres

) has long been recognized as a key cofactor required for phytoplankton growth and as a basis for ecological interactions between phytoplankton and bacteria in the sea. New findings, however, have revealed new functional roles of microbes in cobalamin production and use …

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The concept of metabolism in ocean biogeochemistry: departures, consistencies, and implications

Elis Jones, Erin M. Bertrand

‘Metabolism’ is a term commonly defined as the sum total of chemical processes happening within some living entity which sustains that entity. Biogeochemists use this concept somewhat differently. A stark example comes from marine contexts, where biogeochemists sometimes refer to ‘ocean metabolism’. …

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Wave runup drives coastal flooding on a fetch-limited High Arctic coast

Charles Jourdain-Bonneau, David Didier, Jérémy Baudry, Sebastien Dugas et autres

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Glacier-induced upwelling shapes microbial communities in Arctic marine systems

Jenifer S. Spence, Erin M. Bertrand, Patrick L. White, Claire M. Parrott et autres

Abstract The Canadian Arctic Archipelago (CAA) is warming at an unprecedented rate, leading to sea ice loss and glacial retreat. Marine-terminating (tidewater) glaciers can fuel summertime marine productivity by delivering nutrient-rich deep waters via upwelling to the surface ocean. While the impact …

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Novel connections between B-vitamins and microbial communities along biogeochemical gradients in a large temperate estuary

Meriel Bittner, Catherine C. Bannon, Elden E. Rowland, Gregor Luetzenburg et autres

ABSTRACT As B-vitamins are organic cofactors required by prokaryotic and eukaryotic planktonic cells, their availability impacts aquatic microbial communities and associated biogeochemistry. Contrary to inorganic nutrients, measurements of B-vitamins from brackish systems are scarce and relationships between B-vitamins and plankton composition in …

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Deep Proteomic Profiles of the Antarctic Diatom Fragilariopsis Cylindrus Under Varying Iron and Manganese Conditions

Loay J. Jabre, Elden E. Rowland, J. Scott P. McCain, Erin M. Bertrand

Fragilariopsis cylindrus is a key diatom in the Southern Ocean, where low iron and manganese availability constrain primary production and biogeochemical activity. The molecular mechanisms used by polar diatoms, including F. cylindrus, to cope with trace metal limitations remain largely unexplored. Here …

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Thalassolituus haligoni sp. nov., BB40, a model species for non-cyanobacterial diazotrophs within Oceanospirillales isolated from a Fjord-like Inlet in Kjipuktuk

Sonja A. Rose, Stephanie. L.G. Duffy, Ludovic Pascal, Gwénaëlle Chaillou et autres

Abstract Marine non-cyanobacterial diazotrophs (NCDs) are recognized as globally distributed, however, few representatives have been isolated in pure cultures. As a result, understanding the physiology, growth rate, substrate preference and dinitrogen (N 2 ) fixation capabilities proves difficult. Thalassolituus haligoni . sp. …

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Iron and nitrogen stress controls summertime biogeochemistry in the high‐latitude North Atlantic

Willem H. van de Poll, Rebecca Zitoun, Loay J. Jabre, M.M. Bos et autres

Abstract High‐latitude North Atlantic currents (60°–70°N) exhibit contrasting nutrient stoichiometries, but the spatial extent of post‐spring bloom iron (Fe) and nitrogen (N) stress on phytoplankton around Iceland remains poorly constrained. Here we pair in situ biogeochemical characteristics with 72 h Fe and …

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First characterization of the marine ecosystem of Archer Fiord in the Lasting Ice Area of the High Arctic: a productivity paradox

Maxime Geoffroy, Audrey Limoges, Mathieu Ardyna, Lisa C. Matthes et autres

The Lasting Ice Area along the northern coastline of Ellesmere Island and Greenland will be the region where Arctic multiyear sea ice will persist the longest in a warming climate, making this area critical for ice-dependent species. In 2019, the Tuvaijuittuq Marine …

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Elemental allocation to molecular drivers of biogeochemistry in the Southern Ocean

Loay J. Jabre, Elden E. Rowland, Charlotte Eich, Mathijs van Manen et autres

Abstract Metabolic processes underpinning ocean biogeochemistry are powered by molecular machines, proteins, that require various elements to function. Yet, the allocation of elements to these proteins, and subsequent implications for biogeochemical processes, remain poorly characterized. Here we integrate elemental measurements with metaproteomics …

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Seasonal patterns in B‐vitamins and cobalamin co‐limitation in the Northwest Atlantic

Catherine C. Bannon, Patrick L. White, Elden E. Rowland, Kiran J. More et autres

Abstract B‐vitamins are important co‐enzymes that have long been hypothesized to play key roles in marine ecosystems. However, environmental measurements remain scarce, which limits our understanding of their potential impact. Here, we present mass spectrometry‐based measurements of B‐vitamins (B 1 , B …

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Superoxide dismutases shape manganese stoichiometry in Southern Ocean diatoms

J. Scott P. McCain, Loay J. Jabre, Elden E. Rowland, Jinyoung Jung et autres

Abstract Elemental stoichiometry of biomass is a focal point that connects different biogeochemical cycles. Yet, the mechanistic underpinnings of elemental stoichiometry are poorly quantified in many cases. We combined targeted and untargeted metaproteomics, Bayesian statistical modelling, and geochemical measurements to quantify the …

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