Multivariate Analysis of Correlations Between Environmental Parameters and Cadmium Concentrations in Hyalella azteca (Crustacea: Amphipoda) from Central Ontario Lakes

1988 ◽  
Vol 45 (10) ◽  
pp. 1705-1710 ◽  
Author(s):  
M. Stephenson ◽  
G. L. Mackie
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Principal Components ◽  
Water Hardness ◽  
Environmental Parameters ◽  
Hyalella Azteca ◽  
Dry Mass ◽  
Cadmium Ions ◽  
Littoral Sediments ◽  
High Concentrations

Cadmium concentrations in Hyalella azteca collected from 69 central Ontario lakes ranged from 0.13 to 56.6 μg/g dry mass. Principal components analysis followed by multiple linear regression found three principal components, interpreted as water hardness, total cadmium, and dissolved organic carbon concentrations, to be significantly [Formula: see text] correlated with cadmium concentrations in H. azteca. Cadmium concentrations in H. azteca were independent of cadmium concentrations in littoral sediments. It is suggested that cadmium ions compete with calcium ions for uptake sites on the gill surfaces of H. azteca. High concentrations of dissolved organic carbon may complex free cadmium ions and reduce their concentration in solution, leading to lower cadmium concentrations in H. azteca.

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.

Salinity, dissolved organic carbon and water hardness affect peracetic acid (PAA) degradation in aqueous solutions

2014 ◽  
Vol 60 ◽  
pp. 35-40 ◽  
Author(s):  
Dibo Liu ◽  
Christian E.W. Steinberg ◽  
David L. Straus ◽  
Lars-Flemming Pedersen ◽  
Thomas Meinelt
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Aqueous Solutions ◽  
Peracetic Acid ◽  
Water Hardness

Rapid utilisation of storm water-derived dissolved organic carbon and its fractions in an urban lake

2014 ◽  
Vol 65 (4) ◽  
pp. 370 ◽  
Author(s):  
Todd A. Wallace ◽  
George G. Ganf ◽  
Justin D. Brookes
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Oxygen Demand ◽  
South Australia ◽  
Rapid Decrease ◽  
Biological Oxygen Demand ◽  
Storm Water ◽  
Aquatic Humic Substances ◽  
High Concentrations ◽  
Mediterranean Water

Hypoxia occurred in the Torrens Lake, South Australia, after a 16-mm rainfall which discharged high concentrations of dissolved organic carbon (DOC) into the Lake. This work explores the hypothesis that hypoxia was correlated with the bioavailability of DOC. Carbonaceous biological oxygen demand and a decrease in DOC from samples collected immediately after stormwater was discharged into the Lake confirmed the presence of an active aerobic microbial community. In addition, the inlet and outlet of the Lake were monitored over a 10-day period. Dissolved oxygen fell from 10 to <3 mg L–1 within 44 h as the DOC increased and then decreased. A similar pattern occurred at the outlet after a lag of 20 h. At the inlet, because minimal mixing with the Lake water occurred, the rapid decrease of DOC and its fractions was interpreted as a function of aerobic microbial activity. Aquatic humic substances (AHS) were metabolised fastest, followed by hydrophilic acids (HiA) and hydrophilic neutrals (HiN). The warm nature of Mediterranean water bodies during summer may make them more susceptible to hypoxia as the frequency of extreme droughts allow accumulation of leaf litter and other debris that is subsequently mobilised by episodic floods.

Sensitivity of the glochidia (larvae) of freshwater mussels to copper: Assessing the effect of water hardness and dissolved organic carbon on the sensitivity of endangered species

2008 ◽  
Vol 88 (2) ◽  
pp. 137-145 ◽  
Author(s):  
Patricia L. Gillis ◽  
Rebecca J. Mitchell ◽  
Astrid N. Schwalb ◽  
Kelly A. McNichols ◽  
Gerald L. Mackie ◽  
...  
Keyword(s):  
Endangered Species ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Freshwater Mussels ◽  
Water Hardness ◽  
Effect Of Water

Dissolved organic carbon characteristics in an acidified groundwater-dependent ecosystem

2015 ◽  
Vol 66 (7) ◽  
pp. 582 ◽  
Author(s):  
Azra Mat Daud ◽  
Suzanne McDonald ◽  
Carolyn E. Oldham
Keyword(s):  
Molecular Structure ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Principal Component ◽  
Size Exclusion ◽  
Acidic Groundwater ◽  
Column Adsorption ◽  
Exclusion Chromatography ◽  
Doc Concentration ◽  
High Concentrations

Quantifying and characterising dissolved organic carbon (DOC) is critical to understanding its role in aquatic ecosystems. This is particularly challenging in acidic groundwater-dependent ecosystems, where low pH and high concentrations of Fe affect DOC characterisation. We investigated the variability in DOC concentrations and chemical structure in an acidic wetland, using UV visible spectrophotometry, a range of digestion methods and subsequent TOC analysis, high-pressure size exclusion chromatography (HPSEC) and rapid fractionation techniques. HPSEC results showed that increasing the pH from an original pH 2.3 to a neutral pH reduced the column adsorption of organic carbon, but did not change molecular weight distributions. Principal component analysis suggested that iron concentrations had a more direct effect on molecular structure than pH. The pH, Fe concentrations and DOC characteristics were highly dynamic and spatially variable, and were linked to surface water–groundwater connectivity, as well as horizontal connectivity of surface ponding. The changing pH and Fe concentrations affected DOC concentration and molecular structure with expected effects on bioavailability of DOC.

scholarly journals Ecology of Vibrio parahaemolyticus and Vibrio vulnificus in the Coastal and Estuarine Waters of Louisiana, Maryland, Mississippi, and Washington (United States)

2012 ◽  
Vol 78 (20) ◽  
pp. 7249-7257 ◽  
Author(s):  
Crystal N. Johnson ◽  
John C. Bowers ◽  
Kimberly J. Griffitt ◽  
Vanessa Molina ◽  
Rachel W. Clostio ◽  
...  
Keyword(s):  
United States ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Vibrio Parahaemolyticus ◽  
Vibrio Vulnificus ◽  
Environmental Parameters ◽  
The United States ◽  
Sea Surface ◽  
Content Type ◽  
Thermostable Direct Hemolysin

ABSTRACTVibrio parahaemolyticusandVibrio vulnificus, which are native to estuaries globally, are agents of seafood-borne or wound infections, both potentially fatal. Like all vibrios autochthonous to coastal regions, their abundance varies with changes in environmental parameters. Sea surface temperature (SST), sea surface height (SSH), and chlorophyll have been shown to be predictors of zooplankton and thus factors linked to vibrio populations. The contribution of salinity, conductivity, turbidity, and dissolved organic carbon to the incidence and distribution ofVibriospp. has also been reported. Here, a multicoastal, 21-month study was conducted to determine relationships between environmental parameters andV. parahaemolyticusandV. vulnificuspopulations in water, oysters, and sediment in three coastal areas of the United States. Because ecologically unique sites were included in the study, it was possible to analyze individual parameters over wide ranges. Molecular methods were used to detect genes for thermolabile hemolysin (tlh), thermostable direct hemolysin (tdh), andtdh-related hemolysin (trh) as indicators ofV. parahaemolyticusand the hemolysin genevvhAforV. vulnificus. SST and suspended particulate matter were found to be strong predictors of total and potentially pathogenicV. parahaemolyticusandV. vulnificus. Other predictors included chlorophylla, salinity, and dissolved organic carbon. For the ecologically unique sites included in the study, SST was confirmed as an effective predictor of annual variation in vibrio abundance, with other parameters explaining a portion of the variation not attributable to SST.

EFFECTS OF WATER HARDNESS, ALKALINITY, AND DISSOLVED ORGANIC CARBON ON THE TOXICITY OF COPPER TO THE LATERAL LINE OF DEVELOPING FISH

2009 ◽  
Vol 28 (7) ◽  
pp. 1455 ◽  
Author(s):  
Tiffany L. Linbo ◽  
David H. Baldwin ◽  
Jenifer K. McIntyre ◽  
Nathaniel L. Scholz
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Lateral Line ◽  
Water Hardness
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