scholarly journals Differences in the Effects of Storms on Dissolved Organic Carbon (DOC) in Boreal Lakes during an Early Summer Storm and an Autumn Storm

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1452
Author(s):  
Kate A. Warner ◽  
Rachel A. Fowler ◽  
Jasmine E. Saros
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Quality Metrics ◽  
Early Summer ◽  
Boreal Lakes ◽  
Lake Area ◽  
Acadia National Park ◽  
Seasonal Differences ◽  
Storm Response ◽  
Summer Storm

In boreal lakes, increased precipitation events have been linked to increased concentrations of dissolved organic carbon (DOC), however the effects of seasonal differences on DOC and how this may impact storm response remain unclear. We evaluated DOC concentration and a set of DOC quality metrics during an early summer storm and an autumn storm on a suite of six lakes in Acadia National Park in Maine, USA. to better understand differences in seasonal storm responses. Our results revealed differences in the response of DOC quality metrics to an early summer versus an autumn storm, with changes in DOC quality metrics varying by storm and lake features. During the early summer storm, we observed greater changes in various DOC quality metrics in deep lakes with longer residence times, whereas during the autumn storm, lakes with large watershed area to lake area ratios experienced the greatest changes. Land cover was highly correlated with changing DOC quality metrics in the early summer storm but did not play a significant role in the autumn storm response. Our research provides evidence of seasonal differences in the effects of storms on boreal lakes, which are ultimately mediated by a combination of lake and watershed characteristics as well as seasonal differences in climate such as solar radiation and antecedent weather conditions.

Littoral zones as sources of biodegradable dissolved organic carbon in lakes

2008 ◽  
Vol 65 (11) ◽  
pp. 2454-2460 ◽  
Author(s):  
E. G. Stets ◽  
J. B. Cotner
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Aquatic Macrophytes ◽  
Trophic Status ◽  
Surface Sediments ◽  
Decay Curve ◽  
Lake Area ◽  
Lake Trophic Status ◽  
Littoral Zones ◽  
Biodegradable Dissolved Organic Carbon

A survey of 12 lakes in Minnesota, USA, was conducted to examine the factors controlling variability in biodegradable dissolved organic carbon (BDOC) concentration. The principal question addressed was whether BDOC concentration was more strongly related to lake trophic status or morphometric parameters. BDOC concentration was determined by incubating filtered lake water for a period of 15 months and fitting an exponential decay curve to measured DOC concentrations. BDOC concentrations varied from 73 to 427 µmol C·L–1 and composed 15%–63% of the total DOC pool. There were no significant correlations between BDOC and measures of lake trophic status. Instead, BDOC was most closely associated with the percentage of lake area covered by littoral zone, suggesting a significant source of BDOC from aquatic macrophytes and lake surface sediments.

Hydro-climatic forcing of dissolved organic carbon in two boreal lakes of Canada

2016 ◽  
Vol 571 ◽  
pp. 50-58 ◽  
Author(s):  
Nazzareno Diodato ◽  
Scott Higgins ◽  
Gianni Bellocchi ◽  
Francesco Fiorillo ◽  
Nunzio Romano ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Boreal Lakes ◽  
Climatic Forcing

Modeling Allochthonous Dissolved Organic Carbon Mineralization Under Variable Hydrologic Regimes in Boreal Lakes

Ecosystems ◽  
2016 ◽  
Vol 20 (4) ◽  
pp. 781-795 ◽  
Author(s):  
Dominic Vachon ◽  
Yves T. Prairie ◽  
François Guillemette ◽  
Paul A. del Giorgio
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Carbon Mineralization ◽  
Boreal Lakes ◽  
Hydrologic Regimes ◽  
Organic Carbon Mineralization

Relationship of Mercury Concentrations in Lake Trout (Salvelinus namaycush) and Smallmouth Bass (Micropterus dolomieui) to the Physical and Chemical Characteristics of Ontario Lakes

1989 ◽  
Vol 46 (3) ◽  
pp. 426-434 ◽  
Author(s):  
Michael J. McMurtry ◽  
Donna L. Wales ◽  
Wolfgang A. Scheider ◽  
Gail L. Beggs ◽  
Patricia E. Dimond
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Lake Trout ◽  
Water Hardness ◽  
Salvelinus Namaycush ◽  
Smallmouth Bass ◽  
Stepwise Multiple Regression ◽  
Lake Area ◽  
Micropterus Dolomieui ◽  
The Relationship

Concentrations of mercury in dorsal muscle tissue of lake trout (Salvelinus namaycush) from Ontario lakes were positively correlated with variables indicating lake dystrophy (dissolved organic carbon, colour, iron, transparency) and were also correlated with watershed area and lake area. Stepwise multiple regression selected dissolved organic carbon as the only variable which explained a significant amount of variation (37%) in mercury concentrations in lake trout. The relationship between dissolved organic carbon and mercury appeared to be strongest in the group of lakes with values of dissolved organic carbon less than 4.0 mg∙L−1. In contrast, mercury concentrations in smallmouth bass (Micropterus dolomieui) were correlated with variables reflecting both water hardness (magnesium, calcium, conductivity) and acidity (pH, alkalinity). The relationship was inverse for the water hardness variables and positive for acidity. Stepwise regression identified three variables significant in explaining variation in mercury in smallmouth bass: calcium, dissolved organic carbon, and latitude. Mechanisms that may explain the effects of organic matter, water hardness, and acidity on mercury accumulation by fish are discussed.

scholarly journals Quality transformation of dissolved organic carbon during water transit through lakes: contrasting controls by photochemical and biological processes

2017 ◽  
Author(s):  
Martin Berggren ◽  
Marcus Klaus ◽  
Balathandayuthabani Panneer Selvam ◽  
Lena Ström ◽  
Hjalmar Laudon ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Heterotrophic Bacteria ◽  
Field Studies ◽  
Boreal Lakes ◽  
Biological Processes ◽  
Relative Importance ◽  
In Situ Data ◽  
Headwater Lakes ◽  
Quality Transformation

Abstract. Dissolved organic carbon (DOC) may be removed, transformed or added during water transit through lakes, resulting in qualitative changes in DOC composition and pigmentation (color). However, the process-based understanding of these changes is incomplete, especially for headwater lakes. We hypothesized that because heterotrophic bacteria preferentially consume non-colored DOC, while photochemical processing remove colored fractions, the overall changes in DOC quality and color (absorbance) upon water passage through a lake depends on the relative importance of these two processes, accordingly. To test this hypothesis we combined laboratory experiments with field studies in nine boreal lakes, assessing both the relative importance of different DOC decay processes (biological or photo-chemical) and the loss of color during water transit time (WTT) through the lakes. We found that photo-chemistry qualitatively dominated the DOC transformation in the epilimnia of relatively clear headwater lakes, resulting in selective losses of colored DOC. However, in highly pigmented brown-water lakes (absorbance at 420 nm > 7 m−1) biological processes dominated, and there was no systematic relationship between color loss and WTT. Instead in situ data and dark experiments supported our hypothesis of selective microbial removal of non-pigmented DOC, mainly of low molecular weight, leading to persistent water color over time in these lakes. Our study shows that individual brown headwater lakes do not conform to the commonly reported pattern of selective removal of colored constituents in freshwaters, but rather the DOC shows a sustained degree of pigmentation upon transit through these lakes.

scholarly journals The conservative behavior of dissolved organic carbon in surface waters of the southern Chukchi Sea, Arctic Ocean, during early summer

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Kazuki Tanaka ◽  
Nobuyuki Takesue ◽  
Jun Nishioka ◽  
Yoshiko Kondo ◽  
Atsushi Ooki ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Arctic Ocean ◽  
Surface Waters ◽  
Chukchi Sea ◽  
Early Summer

scholarly journals High Mercury Concentrations of European Perch (Perca fluviatilis) in Boreal Headwater Lakes with Variable History of Acidification and Recovery

2021 ◽  
Vol 232 (9) ◽  
Author(s):  
Martti Rask ◽  
Tommi Malinen ◽  
Mikko Olin ◽  
Kari Nyberg ◽  
Jukka Ruuhijärvi ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Mercury Concentration ◽  
Acid Stress ◽  
Perca Fluviatilis ◽  
Sharp Decrease ◽  
Mercury Content ◽  
Boreal Lakes ◽  
European Perch ◽  
Headwater Lakes

AbstractHigh dissolved organic carbon and low pH are often associated with elevated mercury content of fish in boreal lakes, but less is known about the fish mercury dynamics in lakes recovering from acidification stress. We measured total mercury concentration (THg) in muscle of European perch (Perca fluviatilis) and evaluated the overall correlation with environmental and growth variables in 24 boreal headwater lakes in the 2010s. We found negative correlations of length-corrected perch THg with lake pH and perch growth, but no correlation with dissolved organic carbon. The main emphasis in the present study was focused to a subset of ten lakes in southern Finland with known perch THg during severe acidification in the 1980–1990s. The comparison of perch THg concentrations in the 2010s with values determined in the 1980–1990s showed a sharp increase in most acidic lakes where the perch populations suffered from severe acid stress in the 1980s. This increase was attributed to growth condensation caused by sharp decrease in perch growth during recovery of reproduction capacity and the consequent increases in population densities of perch. Our results highlight the importance of perch growth rate and population density for understanding the variability of fish Hg in boreal headwater lakes, where recovery from acidification can lead to higher mercury concentration of fish in certain cases.

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