Trichodesmium and other planktonic cyanobacteria in New Caledonian waters (SW tropical Pacific) during an El Niño episode - Sorbonne Université Access content directly
Journal Articles Aquatic Microbial Ecology Year : 2018

Trichodesmium and other planktonic cyanobacteria in New Caledonian waters (SW tropical Pacific) during an El Niño episode

Bennet Juhls
Gaëlle Mével
  • Function : Author
David Obie James Anikina
  • Function : Author
Sofia Antonova
  • Function : Author
Thomas Bossé-Demers
  • Function : Author
Lisa Bröder
Flavienne Bruyant
  • Function : Author
Raoul-Marie Couture
Emmanuel Devred
Miles Dillon
  • Function : Author
David Doxaran
  • Function : Author
Aude Flamand
  • Function : Author
Frank Fell
Joannie Ferland
  • Function : Author
Marie-Hélène Forget
  • Function : Author
Michael Fritz
Thomas Gordon
Caroline Guilmette
  • Function : Author
Andrea Hilborn
Rachel Hussherr
  • Function : Author
Charlotte Irish
  • Function : Author
Lauren Kipp
  • Function : Author
Audrey Laberge-Carignan
  • Function : Author
Hugues Lantuit
Edouard Leymarie
  • Function : Author
Antonio Mannino
  • Function : Author
Juliette Maury
  • Function : Author
Paul Overduin
Laurent Oziel
Colin Stedmon
Crystal Thomas
  • Function : Author
Jean-Éric Tremblay
  • Function : Author
Jorien Vonk
  • Function : Author
Dustin Whalen
  • Function : Author
Marcel Babin
  • Function : Author


Abstract. Climate warming and related drivers of soil thermal change in the Arctic are expected to modify the distribution and dynamics of carbon contained in perennially frozen grounds. Thawing of permafrost in the Mackenzie Delta region of northwestern Canada, coupled with increases in river discharge and coastal erosion, trigger the release of terrestrial organic matter (OMt) from the largest Arctic drainage basin in North America into the Arctic Ocean. While this process is ongoing, well-established, and its rate is accelerating, the fate of the newly-mobilized organic matter, as it transits from the watershed through the delta and into the marine system, remains poorly understood. In the framework of the European Horizon 2020 Nunataryuk programme, and as part of the Work Package 4 (WP4) Coastal Waters theme, four field expeditions were conducted in the Mackenzie Delta region and southern Beaufort Sea from April to September 2019. The temporal sampling design allowed the survey of ambient conditions in the coastal waters under full ice cover prior to the spring freshet, during ice break-up in summer, as well as anterior to the freeze-up period in fall. To capture the fluvial-marine transition zone, and with distinct challenges related to shallow waters and changing seasonal and meteorological conditions, the field sampling was conducted in close partnership with members of the communities of Aklavik, Inuvik and Tuktoyaktuk, using several platforms: helicopters, snowmobiles and small boats. Water column profiles of physical and optical variables were measured in situ, while surface water, groundwater and sediment samples were collected and preserved for the determination of the composition and sources of OMt, including particulate and dissolved organic carbon (POC, DOC), and chromophoric dissolved organic matter (CDOM), as well as a suite of physical, chemical and biological variables. Here we present an overview of the standardized datasets, including hydrographic profiles, remote sensing reflectance, temperature and salinity, particle absorption, nutrients, dissolved organic carbon, particulate organic carbon, particulate organic nitrogen, colored dissolved organic matter absorption, fluorescent dissolved organic matter intensity, suspended particulate matter, total particulate carbon, total particulate nitrogen, stable water isotopes, radon in water, bacterial abundance, and a string of phytoplankton pigments including total chlorophyll. Datasets and related metadata can be found in Juhls et al. 2021.
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Dates and versions

hal-04047494 , version 1 (01-01-2024)



Martine Lizotte, Bennet Juhls, Atsushi Matsuoka, Philippe Massicotte, Gaëlle Mével, et al.. Trichodesmium and other planktonic cyanobacteria in New Caledonian waters (SW tropical Pacific) during an El Niño episode. Aquatic Microbial Ecology, 2018, 81 (3), pp.219-241. ⟨10.3354/ame01873⟩. ⟨hal-04047494⟩
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