A5057801751- Marine and coastal ecosystems
- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Marine Biology and Ecology Research
- Microbial Community Ecology and Physiology
- Isotope Analysis in Ecology
- Ocean Acidification Effects and Responses
- Oceanographic and Atmospheric Processes
- Atmospheric and Environmental Gas Dynamics
- Marine Bivalve and Aquaculture Studies
- Atmospheric chemistry and aerosols
- Geology and Paleoclimatology Research
- Marine and fisheries research
- Climate change and permafrost
- Arctic and Russian Policy Studies
- Environmental DNA in Biodiversity Studies
- Geological Studies and Exploration
- Fish Ecology and Management Studies
- Soil and Water Nutrient Dynamics
- Marine and coastal plant biology
- Protist diversity and phylogeny
- Marine animal studies overview
- Food Industry and Aquatic Biology
- Polar Research and Ecology
- Indigenous Studies and Ecology
Xanadu Quantum Technologies (Canada)
2025
Université Laval
2015-2024
McGill University
2000-2024
Université du Québec à Montréal
2016-2024
City University of New York
2024
Université de Montréal
2016-2024
Makivik Corporation
2013-2024
Université de Moncton
2024
Brooklyn College
2024
Centre National de la Recherche Scientifique
2013-2023
Increasing global temperatures are having a profound impact in the Arctic, including dramatic loss of multiyear sea ice 2007 that has continued to present. The majority life Arctic is microbial and consequences climate-mediated changes on marine food webs, which responsible for biogeochemical cycling support higher trophic levels, unknown. We examined communities over time by using high-throughput sequencing DNA collected between 2003 2010 from subsurface chlorophyll maximum (SCM) layer...
Abstract Recent receding of the ice pack allows more sunlight to penetrate into Arctic Ocean, enhancing productivity a single annual phytoplankton bloom. Increasing river runoff may, however, enhance yet pronounced upper ocean stratification and prevent any significant wind‐driven vertical mixing upward supply nutrients, counteracting additional light available phytoplankton. Vertical is key process that will determine fate marine ecosystems. Here we reveal an unexpected consequence loss:...
Despite the high abundance of Archaea in global ocean, their metabolism and biogeochemical roles remain largely unresolved. We investigated population dynamics metabolic activity Thaumarchaeota polar environments, where these microorganisms are particularly abundant exhibit seasonal growth. were more deep Arctic Antarctic waters grew throughout winter at surface deeper halocline waters. However, situ single-cell measurements revealed a low this group uptake both leucine bicarbonate (<5%...
Abstract. Predicting water-column phytoplankton biomass from near-surface measurements is a common approach in biological oceanography, particularly since the advent of satellite remote sensing ocean color (OC). In Arctic Ocean, deep subsurface chlorophyll maxima (SCMs) that significantly contribute to primary production (PP) are often observed. These neither detected by sensors nor accounted for models applied Ocean. Here, we assemble large database pan-Arctic observations (i.e., 5206...
Photonics offers a promising platform for quantum computing1–4, owing to the availability of chip integration mass-manufacturable modules, fibre optics networking and room-temperature operation most components. However, experimental demonstrations are needed complete integrated systems comprising all basic functionalities universal fault-tolerant operation5. Here we construct (sub-performant) scale model computer using 35 photonic chips demonstrate its functionality feasibility. This...
The first quasi‐annual time series of nutrients and chlorophyll fluorescence in the southeast Beaufort Sea showed that mixing, whether driven by wind, local convection, or brine rejection, ensuing replenishment at surface were minimal during autumn winter. Anomalously high inventories observed briefly late December, coinciding with passage an eddy generated offshore. concentrations NO 3 − upper mixed layer otherwise low increased slowly from January to April. coincident decline 2 suggested...
The Canadian Beaufort Sea has been categorized as an oligotrophic system with the potential for enhanced production due to a nutrient‐rich intermediate layer of Pacific‐origin waters. Using under‐ice hydrographic data collected near ice‐edge shallow Arctic bay, we documented upwelling event that brought waters surface during June 2008. resulted in 3‐week long phytoplankton bloom produced estimated 31 g C m −2 new production. This value was approximately twice previous estimates annual...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 412:69-84 (2010) - DOI: https://doi.org/10.3354/meps08666 Prevalence, structure and properties of subsurface chlorophyll maxima in Canadian Arctic waters Johannie Martin1,*, Jean-Éric Tremblay1, Jonathan Gagnon1, Geneviève Tremblay2, Amandine Lapoussière2, Caroline Jose2, Michel Poulin3, Gosselin2, Yves...
We measured the isotopic composition and accumulation of particulate organic matter (POM) uptake carbon (C) nitrogen (N) in an early bloom most productive recurring polynya Arctic Ocean. The estimated compensation irradiance at onset was similar to average for North Atlantic Ocean, implying that shallow mixing critical importance bloomÂs initiation. Planktonic POM had a much lower δ13C than ice POM, suggesting ice-algae contributed little pelagic biomass. overall fractionation N during...
[1] The effects of changing ice and atmospheric conditions on the upwelling deep nutrient-laden waters biological productivity in coastal Beaufort Sea were quantified using a unique combination situ remote-sensing approaches. Repeated instances ablation during fall 2007 summer 2008 multiplied production algae, phytoplankton, zooplankton benthos by 2 to 6 fold. Strong wind forcing failed induce upward shifts stratified off shelf.
Abstract. The Arctic Ocean and its marginal seas are among the marine regions most affected by climate change. Here we present results of a diagnostic model used to assess primary production (PP) trends over 1998–2010 period at pan-Arctic, regional local (i.e. 9.28 km resolution) scales. Photosynthetically active radiation (PAR) above below sea surface was estimated using precomputed look-up tables spectral irradiance, taking as input satellite-derived cloud optical thickness fraction...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 442:37-57 (2011) - DOI: https://doi.org/10.3354/meps09378 Environmental forcing of phytoplankton community structure and function in Canadian High Arctic: contrasting oligotrophic eutrophic regions Mathieu Ardyna1,5,*, Michel Gosselin1, Christine Michel2, Poulin3, Jean-Éric Tremblay4 1Institut des sciences de...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 54:55-70 (2009) - DOI: https://doi.org/10.3354/ame01257 Late summer phytoplankton distribution along a 3500 km transect in Canadian Arctic waters: strong numerical dominance by picoeukaryotes Geneviève Tremblay1, Claude Belzile1, Michel Gosselin1,*, Poulin2, Suzanne Roy1, Jean-Éric Tremblay3 1Institut des sciences de la...
Global gaseous nitrogen (N 2 ) fixation rates may be underestimated and data is lacking from many regions without conspicuous diazotrophic cyanobacteria, such as cold oceans. We estimated N at diverse sites in the Canadian Arctic, including mouth of Mackenzie River, offshore Beaufort Sea, Lancaster Sound, Baffin Bay a river influenced fjord. also identified potential communities using targeted survey nifH gene. Nitrogen ranged 0.02 nmol L −1 d to 4.45 River plume. Sequences recovered gene...
As part of the Canadian contribution to International Polar Year (IPY), several major international research programs have focused on offshore arctic marine ecosystems. The general goal these projects was improve our understanding how response ecosystems climate warming will alter food web structure and ecosystem services provided Northerners. At least four key findings from relating heterotrophic web, pelagic-benthic coupling biodiversity emerged: (1) Contrary a long-standing paradigm...
Arctic Ocean primary productivity is limited by light and inorganic nutrients. With sea ice cover declining in recent decades, nitrate limitation has been speculated to become more prominent. Although much learned about supply from general patterns of ocean circulation water column stability, a quantitative analysis requires dedicated turbulence measurements that have only started accumulate the last dozen years. Here we present new observations turbulent vertical flux Laptev Sea, Baffin...
Abstract. Present and future levels of primary production (PP) in the Arctic Ocean (AO) depend on nutrient inputs to photic zone via vertical mixing, upwelling external sources. In this regard, importance horizontal river supply relative oceanic processes is poorly constrained at pan-Arctic scale. We compiled extensive historical (1954–2012) data discharge concentrations estimate fluxes nitrate, soluble reactive phosphate (SRP), silicate, dissolved organic carbon (DOC), nitrogen (DON),...
Abstract The North Atlantic is characterized by diatom-dominated spring blooms that results in significant transfer of carbon to higher trophic levels and the deep ocean. These are terminated limiting silicate concentrations summer. Numerous regional studies have demonstrated phytoplankton community shifts lightly-silicified diatoms non-silicifying plankton at onset limitation. However, understand basin-scale patterns ecosystem climate dynamics, nutrient inventories must be examined over...
Abstract. Continuous hourly measurements of gas-phase ammonia (NH3(g)) were taken from 13 July to 7 August 2014 on a research cruise throughout Baffin Bay and the eastern Canadian Arctic Archipelago. Concentrations ranged 30 650 ng m−3 (40–870 pptv) with highest values recorded in Lancaster Sound (74°13′ N, 84°00′ W). Simultaneous total ammonium ([NHx]), pH temperature ocean melt ponds used compute compensation point (χ), which is ambient NH3(g) concentration at surface–air fluxes change...
Abstract. Marine diazotrophs convert dinitrogen (N2) gas into bioavailable nitrogen (N), supporting life in the global ocean. In 2012, first version of oceanic diazotroph database (version 1) was published. Here, we present an updated 2), significantly increasing number situ diazotrophic measurements from 13 565 to 55 286. Data points for N2 fixation rates, cell abundance, and nifH gene copy abundance have increased by 184 %, 86 809 respectively. Version 2 includes two new data sheets...