scholarly journals Sediment dynamics in paired High Arctic lakes revealed from high-resolution swath bathymetry and acoustic stratigraphy surveys

2016 ◽  
Vol 121 (9) ◽  
pp. 1676-1696 ◽  
Author(s):  
A. Normandeau ◽  
S. F. Lamoureux ◽  
P. Lajeunesse ◽  
P. Francus
Keyword(s):  
High Resolution ◽  
High Arctic ◽  
Sediment Dynamics ◽  
Arctic Lakes ◽  
Swath Bathymetry

scholarly journals Assessing the utility of sulfur isotope values for understanding mercury concentrations in water and biota from high Arctic lakes

2019 ◽  
Vol 5 (2) ◽  
pp. 90-106 ◽  
Author(s):  
Gretchen L. Lescord ◽  
Meredith G. Clayden ◽  
Karen A. Kidd ◽  
Jane L. Kirk ◽  
Xiaowa Wang ◽  
...  
Keyword(s):  
Food Webs ◽  
Total Mercury ◽  
Nitrogen Isotopes ◽  
Sulfur Isotopes ◽  
High Arctic ◽  
Arctic Lakes ◽  
Carbon And Nitrogen ◽  
Resolute Bay ◽  
Aquatic Food ◽  
Globally Stable

Methylmercury (MeHg) biomagnifies through aquatic food webs resulting in elevated concentrations in fish globally. Stable carbon and nitrogen isotopes are frequently used to determine dietary sources of MeHg and to model its biomagnification. However, given the strong links between MeHg and sulfur cycling, we investigated whether sulfur isotopes (δ34S) would improve our understanding of MeHg concentrations ([MeHg]) in Arctic lacustrine food webs. Delta34S values and total mercury (THg) or MeHg were measured in water, sediments, and biota from six lakes near Resolute Bay, NU, Canada. In two lakes impacted by historical eutrophication, aqueous sulfate δ34S was ∼8‰ more positive than sedimentary δ34S, suggestive of bacterial sulfate reduction in the sediment. In addition, aqueous δ34S showed a significant positive relationship with aqueous [MeHg] across lakes. Within taxa across lakes, [THg] in Arctic char muscle and [MeHg] in their main prey, chironomids, were positively related to their δ34S values across lakes, but inconsistent relationships were found across entire food webs among lakes. Across lakes, nitrogen isotopes were better predictors of biotic [THg] and [MeHg] than δ34S within this dataset. Our results suggest some linkages between Hg and S biogeochemistry in high Arctic lakes, which is an important consideration given anticipated climate-mediated changes in nutrient cycling.

scholarly journals Climate and permafrost effects on the chemistry and ecosystems of High Arctic Lakes

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
K. E. Roberts ◽  
S. F. Lamoureux ◽  
T. K. Kyser ◽  
D. C. G. Muir ◽  
M. J. Lafrenière ◽  
...  
Keyword(s):  
High Arctic ◽  
Arctic Lakes

Chrysophycean stomatocysts from the postglacial sediments of a High Arctic lake

1988 ◽  
Vol 66 (6) ◽  
pp. 1117-1128 ◽  
Author(s):  
Katharine E. Duff ◽  
John P. Smol
Keyword(s):  
Species Composition ◽  
Light Microscopy ◽  
High Arctic ◽  
Ellesmere Island ◽  
Arctic Lakes ◽  
Ecological Research ◽  
Stratigraphic Analysis ◽  
Morphological Detail ◽  
Electron And Light Microscopy ◽  
Scanning Electron

Twenty-six chrysophycean stomatocyst morphotypes were described from the postglacial sediments of a small, rock basin lake near Baird Inlet, Ellesmere Island. Scanning electron and light microscopy were used to classify the stomatocysts, following the guidelines of the International Statospore Working Group. None of the stomatocysts could be related with certainty to the chrysophyte species that produced them, but sufficient morphological detail is present in most of the stomatocysts to allow for taxonomic differentiation. A stratigraphic analysis of the dominant stomatocyst morphotypes revealed that chrysophyte species composition changed most markedly during the lake's early development but then remained relatively constant. This study demonstrated that chrysophycean stomatocysts provide useful paleoecological information in High Arctic lakes, but further taxonomic and ecological research is required to fully exploit these microfossils.

Contaminant fate in high arctic lakes: development and application of a mass balance model

1997 ◽  
Vol 201 (3) ◽  
pp. 171-187 ◽  
Author(s):  
Hilary Freitas ◽  
Miriam Diamond ◽  
Ray Semkin ◽  
Dennis Gregor
Keyword(s):  
Mass Balance ◽  
High Arctic ◽  
Arctic Lakes ◽  
Balance Model ◽  
Mass Balance Model ◽  
Contaminant Fate

Determining the drivers of suspended sediment dynamics in tidal marsh-influenced estuaries using high-resolution ocean color remote sensing

2020 ◽  
Vol 240 ◽  
pp. 111682 ◽  
Author(s):  
Xiaohe Zhang ◽  
Cédric G. Fichot ◽  
Carly Baracco ◽  
Ruizhe Guo ◽  
Sydney Neugebauer ◽  
...  
Keyword(s):  
Remote Sensing ◽  
High Resolution ◽  
Suspended Sediment ◽  
Tidal Marsh ◽  
Ocean Color ◽  
Sediment Dynamics ◽  
Ocean Color Remote Sensing

High-resolution swath bathymetry using MIMO sonar system

2014 ◽  
Vol 25 (5) ◽  
pp. 760-768 ◽  
Author(s):  
Xionghou Liu ◽  
Chao Sun ◽  
Jie Zhuo ◽  
Feng Yi ◽  
Zongwei Liu
Keyword(s):  
High Resolution ◽  
Swath Bathymetry ◽  
Sonar System

scholarly journals Modelling of growing season methane fluxes in a high-Arctic wet tundra ecosystem 1997–2010 using in situ and high-resolution satellite data

Tellus B ◽  
2013 ◽  
Vol 65 (1) ◽  
pp. 19722 ◽  
Author(s):  
Torbern Tagesson ◽  
Mikhail Mastepanov ◽  
Meelis Mölder ◽  
Mikkel P. Tamstorf ◽  
Lars Eklundh ◽  
...  
Keyword(s):  
High Resolution ◽  
Satellite Data ◽  
Growing Season ◽  
High Arctic ◽  
Tundra Ecosystem ◽  
Methane Fluxes

The Impact of Permafrost Disturbances and Sediment Loading on the Limnological Characteristics of Two High Arctic Lakes

2012 ◽  
Vol 23 (2) ◽  
pp. 119-126 ◽  
Author(s):  
Hilary A. Dugan ◽  
Scott F. Lamoureux ◽  
Ted Lewis ◽  
Melissa J. Lafrenière
Keyword(s):  
High Arctic ◽  
Arctic Lakes ◽  
Sediment Loading ◽  
The Impact
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