scholarly journals Estimation of maximum lake depth from the surrounding topography: towards a regional assessment of the occurrence of taliks below Arctic lakes

2021 ◽  
Author(s):  
A -M LeBlanc ◽  
J Chartrand ◽  
S L Smith
Keyword(s):  
Arctic Lakes ◽  
Lake Depth ◽  
Regional Assessment

scholarly journals Comparison of Fatty Acid Contents in Major Lipid Classes of Seven Salmonid Species from Siberian Arctic Lakes

Biomolecules ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 419 ◽  
Author(s):  
Nadezhda N. Sushchik ◽  
Olesia N. Makhutova ◽  
Anastasia E. Rudchenko ◽  
Larisa A. Glushchenko ◽  
Svetlana P. Shulepina ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Natural Populations ◽  
Arctic Lakes ◽  
Lipid Classes ◽  
Total Lipids ◽  
Omega 3 ◽  
Intrinsic Factors ◽  
Siberian Arctic ◽  
Similar Content ◽  
Valuable Compounds

Long-chain omega-3 polyunsaturated fatty acids (LC-PUFA) essential for human nutrition are mostly obtained from wild-caught fish. To sustain the LC-PUFA supply from natural populations, one needs to know how environmental and intrinsic factors affect fish fatty acid (FA) profiles and contents. We studied seven Salmoniformes species from two arctic lakes. We aimed to estimate differences in the FA composition of total lipids and two major lipid classes, polar lipids (PL) and triacylglycerols (TAG), among the species and to evaluate LC-PUFA contents corresponding to PL and TAG in muscles. Fatty acid profiles of PL and TAG in all species were characterized by the prevalence of omega-3 LC-PUFA and C16-C18 monoenoic FA, respectively. Fish with similar feeding spectra were identified similarly in multivariate analyses of total lipids, TAG and PL, due to differences in levels of mostly the same FA. Thus, the suitability of both TAG and total lipids for the identification of the feeding spectra of fish was confirmed. All species had similar content of LC-PUFA esterified as PL, 1.9–3.5 mg g−1, while the content of the TAG form strongly varied, from 0.9 to 9.8 mg g−1. The LC-PUFA-rich fish species accumulated these valuable compounds predominately in the TAG form.

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.

The impact of nitrogen deposition on upland surface waters in Great Britain: A regional assessment of nitrate leaching

1995 ◽  
Vol 85 (2) ◽  
pp. 297-302 ◽  
Author(s):  
T. E. H. Allott ◽  
C. J. Curtis ◽  
J. Hall ◽  
R. Harriman ◽  
R. W. Battarbee
Keyword(s):  
Great Britain ◽  
Nitrogen Deposition ◽  
Surface Waters ◽  
Nitrate Leaching ◽  
Regional Assessment ◽  
The Impact

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

CHIRONOMIDAE (DIPTERA) OF CHAR LAKE, CORNWALLIS ISLAND, N.W.T., WITH DESCRIPTIONS OF TWO NEW SPECIES

1976 ◽  
Vol 108 (10) ◽  
pp. 1053-1064 ◽  
Author(s):  
D. R. Oliver
Keyword(s):  
New Species ◽  
Arctic Lakes ◽  
Additional Species ◽  
Two New Species ◽  
Cornwallis Island ◽  
New Distribution ◽  
Pharate Adult ◽  
Chironomid Fauna

AbstractPseudodiamesa arctica (Mall.), Heterotrissocladius subpilosus (Kieff.), Orthocladius (s.s.) lapponicus Goetgh., Orthocladius (s.s.) sp., Paracladius quadrinodosus Hirv., Trissocladius tricornis n. sp., and Lauterbornia sedna n. sp. develop from egg to pharate adult in Char Lake. The occurrence of the larvae of 7 additional species is apparently adventitious, All stages of the two new species plus the larvae of P. arctica and P. quadrinodosus are described. The males of T. tricornis are dimorphic and L. sedna is parthenogenetic. New distribution records are given for most of the species. The chironomid fauna of Char Lake is compared with that of other arctic lakes.

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