Dissolved organic carbon in a eutrophic lake; dynamics, biodegradability and origin

Fukushima, Takehiko; Park, Je-chul; Imai, Akio; Matsushige, Kazuo

doi:10.1007/bf00877112

Cited by 72 publications

(38 citation statements)

References 27 publications

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“…It is Japan's second largest lake, with a surface area of 171 km 2 , an average depth of 4 m, and a maximum depth of 7.3 m (only for Nishiura). This lake is considered hypertrophic because of its high loads of nutrients and shallow depth [13]. Although average Chl-a has decreased from 87 to 61 mg•m −3 during the past three decades, the mean total phosphorus concentration increased from 116 to 138 mg•m −3 .…”

Section: Study Areasmentioning

confidence: 99%

Remote Estimation of Chlorophyll-a in Inland Waters by a NIR-Red-Based Algorithm: Validation in Asian Lakes

Yang

Matsushita

et al. 2014

Remote Sensing

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Satellite remote sensing is a highly useful tool for monitoring chlorophyll-a concentration (Chl-a) in water bodies. Remote sensing algorithms based on near-infrared-red (NIR-red) wavelengths have demonstrated great potential for retrieving Chl-a in inland waters. This study tested the performance of a recently developed NIR-red based algorithm, SAMO-LUT (Semi-Analytical Model Optimizing and Look-Up Tables), using an extensive dataset collected from five Asian lakes. Results demonstrated that Chl-a retrieved by the SAMO-LUT algorithm was strongly correlated with measured Chl-a (R 2 = 0.94), and the root-mean-square error (RMSE) and normalized root-mean-square error (NRMS) were 8.9 mg•m −3 and 72.6%, respectively. However, the SAMO-LUT algorithm yielded large errors for sites where Chl-a was less than 10 mg•m −3 (RMSE = 1.8 mg•m −3 and NRMS = 217.9%). This was because differences in water-leaving radiances at the NIR-red wavelengths (i.e., 665 nm, 705 nm and 754 nm) used in the SAMO-LUT were too small due to low concentrations of water constituents. Using a blue-green algorithm (OC4E) instead of the SAMO-LUT for the waters with low constituent concentrations would have reduced the RMSE and NRMS to 1.0 mg•m −3 and 16.0%, respectively. This indicates(1) the NIR-red algorithm does not work well when water constituent concentrations are

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Section: Study Areasmentioning

confidence: 99%

Remote Estimation of Chlorophyll-a in Inland Waters by a NIR-Red-Based Algorithm: Validation in Asian Lakes

Yang

Matsushita

et al. 2014

Remote Sensing

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“…The quality of the dissolved organic matter was measured using specific ultraviolet absorbance (SUV A), defined as the UV absorbance of a water sample at a given wavelength normalized against DOC concentration. A spectrophotometer (Shimadzu UV-1601PC, Japan) was used to measure the UV absorbance (at 260 nm) in the water samples (Fukushima et al, 1996;Zieliński and Górniak, 1999;Weishar et al, 2003;Aoki et al, 2004).…”

Section: > Physical and Chemical Analysesmentioning

confidence: 99%

“…The dissolved organic carbon (DOC) content in water increases because of the microbiological degradation of organic matter produced in the lake, but mainly because of its release by aquatic organisms, i.e., algal exudation, the lysis of phytoplankton cells, and direct and indirect release by zooplankton and other aquatic animals (Wetzel, 1983;Hoppe, 1984). Apart from autochthonous sources, both forms of organic matter also originate from watersheds as labile and refractory compounds (Fukushima et al, 1996). Allochthonous sources of organic matter may significantly fuel the pelagic food web, but seasonal variability exists in terrestrial carbon subsidies (Tranvik, 1992;Grey et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Zooplankton response to organic carbon level in lakes of differing trophic states

Bowszys

Dunalska

Jaworska

2014

Knowl. Managt. Aquatic Ecosyst.

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Key-words:zooplankton, Crustacea, total organic carbon, dissolved organic carbon, particulate organic carbon Water eutrophication is associated with an increase in the organic carbon content (both particulate and dissolved forms), which may affect the functioning of the zooplankton community. Mesotrophic and eutrophic lakes in the Masurian Lake District (Poland) were selected to evaluate the relationship between the organic carbon level and the zooplankton community. The lakes differed significantly in most environmental variables. RDA analysis was performed to evaluate the impact of environmental variables on zooplankton. The variables that significantly explained the variance in the zooplankton community abundance (Monte Carlo permutation test) included dissolved and particulate organic carbon, Secchi disc visibility, soluble reactive phosphorus and total nitrogen. The response of zooplankton to an increasing level of organic carbon is functional rather than quantitative. In the mesotrophic system, the results of the redundancy analysis indicated relatively strong positive relationships between dissolved organic carbon and zooplankton biomass, and negative correlations between chlorophyll a and zooplankton biomass. The above suggests that indirect organic carbon utilization by zooplankton could partly compensate for the poor feeding conditions of planktonic animals (decreased phytoplankton availability). In the eutrophic lake, elevated organic carbon levels are partly limited by zooplankton, which is suggested by the positive relationship between particulate organic matter and the total zooplankton biomass (RDA results). The positive relationship between the biomass of copepods and organic carbon in particulate and dissolved forms implies that copepods benefit from the increased heterotrophic carbon flow that is activated in the eutrophic lake. RÉSUMÉRéponse du zooplancton au niveau de carbone organique dans des lacs de statuts trophiques différents Mots-clés :zooplancton, crustacés, L'eutrophisation de l'eau est associée à une augmentation de la teneur en carbone organique (à la fois les formes particulaires et les dissoutes), ce qui peut affecter le fonctionnement de la communauté du zooplancton. Des lacs mésotrophes et eutrophes dans le district des lacs de Mazurie (Pologne) ont été choisis pour évaluer les relations entre le niveau de carbone organique et la communauté du zooplancton. Les lacs diffèrent significativement dans la plupart des variables environnementales. L'analyse RDA a été réalisée pour évaluer l'impact des variables environnementales sur le zooplancton. Les variables qui expliquent de façon significative la variance de l'abondance de la communauté de zooplancton (test de permutation de Monte Carlo) comprennent le carbone organique dissous et particulaire, la visibilité du disque de Secchi, le phosphore réactif soluble et l'azote total. La réponse du zooplancton à l'augmentation du niveau de carbone organique est fonctionnelle plutôt que quantitative. Dans le système mésotrophe, l...

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“…The ratios of E260/DOC for pedogenic DOC and autochthonous DOC were reported to be 23 -58 and 8 -16 cm -1 (g C) -1 l, respectively. 11,12 Seasonal changes in the ratios of E260/DOC in Lake Biwa are shown in Fig. 8.…”

Section: Characteristics Of Humic Substances and Doc In Lake Biwa Andmentioning

confidence: 99%

Determinations of Humic Substances and Other Dissolved Organic Matter and Their Effects on the Increase of COD in Lake Biwa

2004

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Dissolved organic carbon in a eutrophic lake; dynamics, biodegradability and origin

Cited by 72 publications

References 27 publications

Remote Estimation of Chlorophyll-a in Inland Waters by a NIR-Red-Based Algorithm: Validation in Asian Lakes

Remote Estimation of Chlorophyll-a in Inland Waters by a NIR-Red-Based Algorithm: Validation in Asian Lakes

Zooplankton response to organic carbon level in lakes of differing trophic states

Determinations of Humic Substances and Other Dissolved Organic Matter and Their Effects on the Increase of COD in Lake Biwa

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