The contribution of phytoplankton degradation to chromophoric dissolved organic matter (CDOM) in eutrophic shallow lakes: Field and experimental evidence

Zhang, Yunlin; Dijk, Mark A. van; Liu, Mingliang; Zhu, Guangwei; Qin, Boqiang

doi:10.1016/j.watres.2009.07.024

Cited by 413 publications

(230 citation statements)

References 46 publications

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“…Thereby, we demonstrated that the main source of DOM in DH come from the terrestrial input during the rainy period, reinforcing the importance of preserving the original forest surrounding the lakes to the global carbon cycle. In Pampulha reservoir we observed that degradation of phytoplankton is an important source of DOM and most likely also to the regeneration of nutrients, which has already been demonstrated for other eutrophic systems (Zhang et al, 2009(Zhang et al, , 2013(Zhang et al, , 2013b. We also found that autochthonous production of CDOM can increase the PAR and UV attenuation, as observed in the positive correlations between CDOM and attenuation coefficients only in Pampulha and during an algal bloom.…”

Section: Discussionsupporting

confidence: 82%

“…Understanding the environmental conditions and physical, chemical and biological processes involved in the production and mineralization of DOM, is therefore also of great importance to assess the role of lakes in carbon cycling at regional and global scale (Bertilsson and Tranvik, 2000;Johannessen et al, 2007). Although the importance of distribution and cycling of DOM is well known, the origins, transport and transformations are not well understood (Zhang et al, 2009), especially in tropical environments.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, CDOM degradation is also affected by the availability of nutrients throughout the year, a limiting factor for microbial degradation. In eutrophic lakes, degradation of phytoplankton is an important source of CDOM and regeneration of nutrients for bacteria and also the phytoplankton community, especially after seasonal blooms of these organisms (Bracchini et al, 2009;Zhang et al, 2009Zhang et al, , 2013b.…”

Section: Introductionmentioning

confidence: 99%

“…The estimated apparent molecular size (M) is obtained by the ratio of two absorption coefficients (a250:a365), based on the fact that declining ratio indicates increasing of molecular size (De Haan, 1987;Peuravuori and Pihlaja, 1997). In recent decades researchers have used these spectral metrics to investigate the optical properties in temperate aquatic systems (Zhang et al, 2007a(Zhang et al, , 2007b(Zhang et al, , 2009Helms et al, 2008;Bracchini et al, 2010), but studies using this approach in tropical environments are still scarce and little is known to Brazilian aquatic systems (Teixeira et al, 2011(Teixeira et al, , 2013Bittar et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, Pampulha (Belo Horizonte, MG, Brazil) is a shallower (max 17 m) and less dendritic eutrophic reservoir with reoccurring phytoplankton blooms throughout the year, especially in the summers during thermal stratification. As in other eutrophic lakes, concentrations and quality of the DOM are strongly influenced by the high phytoplankton abundance (Tôrres et al, 1998;Bracchini et al, 2009;Zhang et al, 2009Zhang et al, , 2013b. Considering that the main source of dissolved organic matter in the eutrophic Pampulha reservoir comes from degradation of phytoplankton, especially after an algal bloom, while the main source of DOM in DH Lake comes from allochthonous material from the forest in rainy season, we hypothesized that: a) The different sources of DOM (allochthonous in DH and autochthonous in Pampulha) provide different optical qualities of CDOM, which alters the under-water light climate and the availability of nutrients; b) The lakes have seasonal differences in their inherent and apparent optical properties.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Seasonal changes in optical properties of two contrasting tropical freshwater systems

2016

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Seasonal changes in optical properties of two contrasting tropical freshwater systems

2016

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Controls on the distribution of fluorescent dissolved organic matter during an under‐ice algal bloom in the western Arctic Ocean

Mendoza

Weiss

Schieber

et al. 2017

Global Biogeochemical Cycles

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In this study we used fluorescence excitation and emission matrix spectroscopy, hydrographic data, and a self‐organizing map (SOM) analysis to assess the spatial distribution of labile and refractory fluorescent dissolved organic matter (FDOM) for the Chukchi and Beaufort Seas at the time of a massive under‐ice phytoplankton bloom during early summer 2011. Biogeochemical properties were assessed through decomposition of water property classes and sample classification that employed a SOM neural network‐based analysis which classified 10 clusters from 269 samples and 17 variables. The terrestrial, humic‐like component FDOM (ArC1, 4.98 ± 1.54 Quinine Sulfate Units (QSU)) and protein‐like component FDOM (ArC3, 1.63 ± 0.88 QSU) were found to have elevated fluorescence in the Lower Polar Mixed Layer (LPML) (salinity ~29.56 ± 0.76). In the LPML water mass, the observed contribution of meteoric water fraction was 17%, relative to a 12% contribution from the sea ice melt fraction. The labile ArC3‐protein‐like component (2.01 ± 1.92 QSU) was also observed to be elevated in the Pacific Winter Waters mass, where the under‐ice algal bloom was observed (~40–50 m). We interpreted these relationships to indicate that the accumulation and variable distribution of the protein‐like component on the shelf could be influenced directly by sea ice melt, transport, and mixing processes and indirectly by the in situ algal bloom and microbial activity. ArC5, corresponding to what is commonly considered marine humic FDOM, indicated a bimodal distribution with high values in both the freshest and saltiest waters. The association of ArC5 with deep, dense salty water is consistent with this component as refractory humic‐like FDOM, whereas our evidence of a terrestrial origin challenges this classic paradigm for this component.

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Chromophoric and fluorescent dissolved organic matter in and above the oxygen minimum zone off Peru

Loginova

Thomsen

Engel

2016

J. Geophys. Res. Oceans

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As a result of nutrient upwelling, the Peruvian coastal system is one of the most productive regions in the ocean. Sluggish ventilation of intermediate waters, characteristic for the Eastern Tropical South Pacific (ETSP) and microbial degradation of a high organic matter load promotes deoxygenation at depth. Dissolved organic matter (DOM) plays a key role in microbial respiration and carbon cycling, but little is known on DOM distribution and cycling in the ETSP. DOM optical properties give important insights on DOM sources, structure and biogeochemical reactivity. Here, we present data and a conceptual view on distribution and cycling of chromophoric (CDOM) and fluorescent (FDOM) DOM in and above the oxygen minimum zone (OMZ) off Peru. Five fluorescent components were identified during PARAFAC analysis. Highest intensities of CDOM and of the amino acid‐like fluorescent component (C3) occurred above the OMZ and coincided with maximum chl a concentrations, suggesting phytoplankton productivity as major source. High intensities of a marine humic‐like fluorescent component (C1), observed in subsurface waters, indicated in situ microbial reworking of DOM. FDOM release from inner shelf sediment was determined by seawater analysis and continuous glider sensor measurement and included a humic‐like component (C2) with a signature typical for terrestrially derived humic acids. Upwelling supplied humic‐like substances to the euphotic zone. Photo‐reactions were likely involved in the production of a humic‐like fluorescent component (C5). Our data show that variable biological and physical processes need to be considered for understanding DOM cycling in a highly dynamic coastal upwelling system like the ETSP off Peru.

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The contribution of phytoplankton degradation to chromophoric dissolved organic matter (CDOM) in eutrophic shallow lakes: Field and experimental evidence

Cited by 413 publications

References 46 publications

Seasonal changes in optical properties of two contrasting tropical freshwater systems

Seasonal changes in optical properties of two contrasting tropical freshwater systems

Controls on the distribution of fluorescent dissolved organic matter during an under‐ice algal bloom in the western Arctic Ocean

Chromophoric and fluorescent dissolved organic matter in and above the oxygen minimum zone off Peru

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