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Elemental and stable isotopic constraints on river influence and patterns of nitrogen cycling and biological productivity in Hudson Bay

Published on Feb 1, 2010in Continental Shelf Research2.13
· DOI :10.1016/j.csr.2009.10.014
Zou Zou A. Kuzyk15
Estimated H-index: 15
(UM: University of Manitoba),
Robie W. Macdonald66
Estimated H-index: 66
(UM: University of Manitoba)
+ 1 AuthorsGary A. Stern38
Estimated H-index: 38
(UM: University of Manitoba)
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Abstract
Abstract Elemental (carbon and nitrogen) ratios and stable carbon and nitrogen isotope ratios (δ 13 C and δ 15 N) are examined in sediments and suspended particulate matter from Hudson Bay to study the influence of river inputs and autochthonous production on organic matter distribution. River-derived particulate organic matter (POM) is heterogeneous, nitrogen-poor and isotopically depleted, consistent with expectations for OM derived from terrestrial C3 vascular plant sources, and distinct from marine OM sources. Both δ 13 C and C/N source signatures seem to be transmitted to sediments with little or no modification, therefore making good tracers for terrigenous OM in Hudson Bay. They suggest progressively larger contributions from marine sources with distance from shore and secondarily from south to north, which broadly corresponds to the distribution of river inputs to Hudson Bay. Processes other than mixing of marine and terrigenous OM influence sedimentary δ 15 N values, including variability in the δ 15 N of phytoplankton in the Bay's surface waters due to differences in relative nitrate utilization, and post-production processes, which bring about an apparently constant 15 N-enrichment between surface waters and underlying sediments. Variability in the δ 15 N of phytoplankton in the Bay's surface waters, in contrast, seems to be organized spatially with a pattern that suggests an inshore–offshore difference in surface water nitrogen conditions (open- vs. closed-system) and hence the δ 15 N value of phytoplankton. The δ 15 N patterns, supported by a simple nitrate box-model budget, suggest that in inshore regions of Hudson Bay, upwelling of deep, nutrient-rich waters replenishes surface nitrate, resulting in ‘open system’ conditions which tend to maintain nitrate δ 15 N at low and constant values, and these values are reflected in the sinking detritus. River inflow, which is constrained to inshore regions of Hudson Bay, appears to be a relatively minor source of nitrate compared to upwelling of deep waters. However, river inflow may contribute indirectly to enhanced inshore nutrient supply by supporting large-scale estuarine circulation and consequently entrainment and upwelling of deep water in this area. In contrast to previous proposals that Hudson Bay is oligotrophic because it receives too much fresh water ( Dunbar, 1993 ), our results support most of the primary production being organized around the margin of the Bay, where river flow is constrained.
  • References (100)
  • Citations (30)
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References100
Newest
Published on Jan 1, 2014
Michael J. Mottl44
Estimated H-index: 44
,
Henry Elderfield80
Estimated H-index: 80
1. Introduction to ocean geochemistry (H. Elderfield). 2. Physico-chemical controls on seawater (F.J. Millero). 3. Controls on trace metals in seawater (K.W. Bruland). 4. Gases in seawater (P.S. Liss). 5. The biological pump (C.L. de la Rocha). 6. Marine bio-inorganic chemistry (F.M.M. Morel). 7. Marine organic geochemistry (T.I. Eglington, D.J. Repeta). 8. The geochemical budget for seawater (D.Archer, H. Elderfield). 9. Estuarine and coastal processes (L.K. Benninger, C.S Martens). 10. Hydroth...
Published on Jan 1, 2014
T.I. Eglinton1
Estimated H-index: 1
(EPFL: École Polytechnique Fédérale de Lausanne),
D.J. Repeta1
Estimated H-index: 1
The oceans represent a major sink for anthropogenic CO 2 , with the production, dispersal, modification, and degradation of reduced (organic) carbon species playing an integral role in dictating the efficacy and permanency of this oceanic sink. It is therefore imperative that we develop a better understanding of controls on the sources and fate of organic matter in the context of the global carbon cycle in order to assess the long-term consequences and health of the planet, as well as to deciphe...
Published on Jan 1, 2010
Kon-Kee Liu42
Estimated H-index: 42
,
Larry P. Atkinson43
Estimated H-index: 43
+ 2 AuthorsFred T. Mackenzie1
Estimated H-index: 1
Perspectives and Regional Syntheses.- Biogeochemistry of Continental Margins in a Global Context.- Eastern Boundary Current Systems.- Western Boundary Currents.- Indian Ocean Margins.- Subpolar Margins.- Polar Margins.- Marginal Seas.- Tropical Margins.- Arising Issues and New Approaches.- Examining Human Impacts on Global Biogeochemical Cycling Via the Coastal Zone and Ocean Margins.- Biogeochemical Transformations of Silicon Along the Land-Ocean Continuum and Implications for the Global Carbon...
Published on Aug 22, 2009in Journal of Geophysical Research3.23
Mats A. Granskog17
Estimated H-index: 17
(UM: University of Manitoba),
Robie W. Macdonald66
Estimated H-index: 66
(Fisheries and Oceans Canada)
+ 5 AuthorsFrançois J. Saucier16
Estimated H-index: 16
(Université du Québec)
[1] Distributions of freshwater (sea-ice melt and runoff) were investigated along inshore-offshore sections in southwestern Hudson Bay for fall conditions. Conductivity-temperature-density profiles and bottle samples collected for salinity, oxygen isotope (δ18O), and colored dissolved organic matter (CDOM) analyses were used to discriminate between contributions of river water (RW) and sea-ice melt (SIM). Stations had a fresh summer surface mixed layer 5–25 m thick overlying a cold subsurface la...
Published on Aug 1, 2009in Marine Geology3.35
Zou Zou A. Kuzyk15
Estimated H-index: 15
(UM: University of Manitoba),
Robie W. Macdonald66
Estimated H-index: 66
(UM: University of Manitoba)
+ 2 AuthorsGary A. Stern38
Estimated H-index: 38
(UM: University of Manitoba)
Abstract A preliminary sediment and organic carbon budget is constructed for the Hudson Bay marine system based on published literature and new data collected from nine rivers and 13 sediment boxcores. The budget considers the main inputs of terrestrial and marine components of sediment and organic carbon and the main sinks (sediment burial) and losses (oxidation, export to Hudson Strait). Sedimentation rates (0.032–0.23 g cm − 2 yr − 1 ) were estimated from 210 Pb profiles and a sediment advect...
Published on Jan 1, 2009
Robie W. Macdonald66
Estimated H-index: 66
,
Leif G. Anderson40
Estimated H-index: 40
+ 3 AuthorsRüdiger Stein1
Estimated H-index: 1
Published on Dec 1, 2008in Marine Chemistry2.71
Zou Zou A. Kuzyk15
Estimated H-index: 15
(UM: University of Manitoba),
Miguel A. Goñi42
Estimated H-index: 42
(OSU: Oregon State University)
+ 1 AuthorsRobie W. Macdonald66
Estimated H-index: 66
(UM: University of Manitoba)
Abstract Hudson Bay is a large, estuarine, shelf-like sea at the southern margin of the Arctic, where changes in seasonal ice cover and river discharge appear already to be underway. Here we present lignin data for dated sediments from eleven box cores and evaluate sources of terrigenous carbon, transport pathways, and whether terrigenous organic matter has been influenced by recent environmental change. Lignin yields (0.04 to 1.46 mg/100 mg organic carbon) decreased from the margin to the inter...
Published on Apr 1, 2008in Estuarine Coastal and Shelf Science2.61
Zou Zou A. Kuzyk15
Estimated H-index: 15
(Fisheries and Oceans Canada),
Robie W. Macdonald66
Estimated H-index: 66
(UM: University of Manitoba)
+ 5 AuthorsG. A. Stern25
Estimated H-index: 25
(Fisheries and Oceans Canada)
A conceptual scheme for the transition from winter to spring is developed for a small Arctic estuary (Churchill River, Hudson Bay) using hydrological, meteorological and oceanographic data together with models of the landfast ice. Observations within the Churchill River estuary and away from the direct influence of the river plume (Button Bay), between March and May 2005, show that both sea ice (production and melt) and river water influence the region's freshwater budget. In Button Bay, ice pro...
Published on Feb 13, 2008in Journal of Geophysical Research3.23
Alexandre Forest18
Estimated H-index: 18
(Laval University),
Makoto Sampei11
Estimated H-index: 11
(Laval University)
+ 5 AuthorsLouis Fortier39
Estimated H-index: 39
(Laval University)
[1] As part of the Canadian Arctic Shelf Exchange Study (CASES), we assessed the importance of new production and resuspension in determining the nature and magnitude of the deep (210 m) particulate organic carbon (POC) flux from October 2003 to September 2004 in central Franklin Bay. In spring and summer, phytoplankton production was nutrient-limited in the stratified surface layer and the initial spring bloom evolved into a subsurface chlorophyll maximum (SCM) at the nutricline. Large herbivor...
Published on Sep 1, 2007in Continental Shelf Research2.13
Mats A. Granskog17
Estimated H-index: 17
(UM: University of Manitoba),
Robie W. Macdonald66
Estimated H-index: 66
+ 1 AuthorsDavid G. Barber37
Estimated H-index: 37
(UM: University of Manitoba)
Abstract The characteristics of chromophoric dissolved organic matter (CDOM) were studied in Hudson Bay and Hudson Strait in the Canadian Arctic. Hudson Bay receives a disproportionately large influx of river runoff. With high dissolved organic matter (DOM) concentrations in Arctic rivers the influence of CDOM on coastal and ocean systems can be significant, yet the distribution, characteristics and potential consequences of CDOM in these waters remain unknown. We collected 470 discrete water sa...
Cited By30
Newest
Published on Aug 16, 2018in Geophysical Research Letters4.58
Matthew K. MacDonald2
Estimated H-index: 2
(UM: University of Manitoba),
Tricia Stadnyk6
Estimated H-index: 6
(UM: University of Manitoba)
+ 4 AuthorsBerit Arheimer31
Estimated H-index: 31
(SMHI: Swedish Meteorological and Hydrological Institute)
Impacts of 1.5 and 2.0 degrees C Warming on Pan-Arctic River Discharge Into the Hudson Bay Complex Through 2070
Published on Dec 1, 2017in Biogeochemistry3.41
Benoit Thibodeau10
Estimated H-index: 10
(HKU: University of Hong Kong),
Christophe Migon25
Estimated H-index: 25
(University of Paris)
+ 4 AuthorsLouis Legendre15
Estimated H-index: 15
(University of Paris)
Atmospheric input of anthropogenic lead increased globally over the last centuries. The present study shows that the concentrations of lead in sediment cores from low-productivity Hudson Bay, northern Canada, remained relatively constant over the last centuries. The lack of imprint of the increased anthropogenic lead input in this marine environment is not consistent with the increased lead concentrations in nearby lakes over the same period. In addition, the observed trend in lead isotopic comp...
Published on Nov 1, 2017in Polar Biology2.00
Corinne Pomerleau7
Estimated H-index: 7
(UM: University of Manitoba),
Mads Peter Heide-Jørgensen39
Estimated H-index: 39
+ 3 AuthorsGary A. Stern38
Estimated H-index: 38
(UM: University of Manitoba)
Climate change is causing physical and biological changes in the polar marine environment, which may impact higher trophic level predators such as the bowhead whale (Balaena mysticetus) and the structure of their food webs. We used bulk stable isotope analysis and compound-specific isotope analysis (CSIA) of individual amino acids (AA) to examine bowhead whale trophic position and the biogeochemistry of one of their feeding grounds, Disko Bay, West Greenland, over a period of 7 years (2007–2013)...
Published on May 1, 2016in Science of The Total Environment5.59
Corinne Pomerleau7
Estimated H-index: 7
(UM: University of Manitoba),
Gary A. Stern38
Estimated H-index: 38
(UM: University of Manitoba)
+ 3 AuthorsLouis Fortier39
Estimated H-index: 39
(Laval University)
Abstract Zooplankton play a central role in marine food webs, dictating the quantity and quality of energy available to upper trophic levels. They act as “keystone” species in transfer of mercury (Hg) up through the marine food chain. Here, we present the first Pan-Arctic overview of total and monomethylmercury concentrations (THg and MMHg) and stable isotope ratios of carbon (δ 13 C) and nitrogen (δ 15 N) in selected zooplankton species by assembling data collected between 1998 and 2012 from si...
Published on May 1, 2016in Marine Micropaleontology2.66
Maija Heikkilä13
Estimated H-index: 13
(UH: University of Helsinki),
Vera Pospelova25
Estimated H-index: 25
(UVic: University of Victoria)
+ 3 AuthorsRobie W. Macdonald66
Estimated H-index: 66
(UM: University of Manitoba)
Abstract We present continuous bi-weekly to bi-monthly dinoflagellate cyst, tintinnid loricae and tintinnid cyst fluxes at two mooring sites in Hudson Bay (subarctic Canada) from October 2005 to September 2006. The total dinoflagellate cyst fluxes at the site on the western side of the bay ranged from 4600 to 53,600 cysts m − 2 day − 1 (average 20,000 cysts m − 2 day − 1 ), while on average three times higher fluxes (average 62,300 cysts m − 2 day − 1 ) were recorded at the site on the eastern s...
Published on Feb 1, 2016in Continental Shelf Research2.13
Katarzyna Koziorowska2
Estimated H-index: 2
(PAN: Polish Academy of Sciences),
Karol Kuliński13
Estimated H-index: 13
(PAN: Polish Academy of Sciences),
Janusz Pempkowiak27
Estimated H-index: 27
(PAN: Polish Academy of Sciences)
Abstract The aim of this study was to estimate the spatial variability of organic carbon (C org ) and total nitrogen (N tot ) concentrations, C org /N tot ratios, stable isotopes of carbon and nitrogen (δ 13 C org , δ 15 N tot ) and the proportions of autochthonous and allochtonous organic matter within recently deposited sediments of two Spitsbergen fjords: the Hornsund and the Adventfjord, which are affected to a different degree by the West Spitsbergen Current. C org concentrations ranged fro...
Published on Aug 1, 2015
Virginie Roy6
Estimated H-index: 6
(Université du Québec à Rimouski),
Katrin Iken27
Estimated H-index: 27
(UAF: University of Alaska Fairbanks)
+ 3 AuthorsPhilippe Archambault27
Estimated H-index: 27
(Université du Québec à Rimouski)
Abstract Climate changes in the Arctic are expected to decrease the currently tight pelagic–benthic coupling, yet large-scale, regional understanding of the origin of food for benthic organisms across both biological productivity and depth gradients is still missing. The organic matter assimilation pathways of benthic organisms, along with food-web structure, were investigated at shelf and slope locations spanning 2000 km across the Canadian Arctic using stable carbon and nitrogen isotope analys...
Published on Jul 1, 2015in Limnology and Oceanography4.33
Michail I. Gladyshev27
Estimated H-index: 27
(Russian Academy),
Olesia V. Kolmakova1
Estimated H-index: 1
(Russian Academy)
+ 7 AuthorsNadezhda N. Sushchik17
Estimated H-index: 17
(Russian Academy)
We studied biogeochemical characteristics, including organic carbon and nitrogen contents, fatty acid (FA) composition, stable isotope ratios, and primary production in conjunction with species composition of bacterioplankton, using next generation sequencing, in the Yenisei River along a distance ∼1800 km. Basing on FA composition of particulate organic matter (POM) and on other indicators of sources of POM, the river was subdivided into four sections. The upper section 1, situated in mountain ...
Published on May 1, 2015in Canadian Journal of Earth Sciences1.42
Maxime Jolivel2
Estimated H-index: 2
(Laval University),
Michel Allard24
Estimated H-index: 24
(Laval University),
Guillaume St-Onge28
Estimated H-index: 28
(Université du Québec à Rimouski)
In an attempt to determine to what extent the impact of recent climate changes that occurred east of Hudson Bay, including important reduction of areas in permafrost, had on the coastal marine environment, a series of shallow cores were extracted from the seabed off the mouth of the Sheldrake River, in Nastapoka Sound. A total of 25 cores were taken in April 2009 from the ice cover. A preliminary seafloor map was first done to help in the selection of the coring sites. Nastapoka Sound has a comp...
View next paperModelling the sea ice-ocean seasonal cycle in Hudson Bay, Foxe Basin and Hudson Strait, Canada