Biogeneration of chromophoric dissolved organic matter by bacteria and krill in the Southern Ocean

Ortega-Retuerta, E.; Frazer, Thomas K.; Duarte, Carlos M.; Ruíz‐Halpern, Sergio; Tovar-Sánchez, Antonio; Arrieta, Jesús M.; Reche, Isabel

doi:10.4319/lo.2009.54.6.1941

Cited by 89 publications

(70 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The microbial production of CDOM has also been observed during microbial culture experiments Biers et al, 2007;Ortega-Retuerta et al, 2009). On the other hand, various biological sources, i.e., zooplankton Ortega-Retuerta et al, 2009), cyanobacteria Trichodesmium spp. , and dinoflagellates (Vernet and Whitehead, 1996) have been considered as sources of CDOM.…”

Section: Factors Controlling the Cdom Level At The Subarctic And The mentioning

confidence: 79%

“…At the BATS site in the Sargasso Sea, the seasonal cycle of CDOM level has been considered the result of photobleaching, winter convective mixing, and production during heterotrophic recycling of organic carbon rather than primary production (Nelson et al, 1998;. The microbial production of CDOM has also been observed during microbial culture experiments Biers et al, 2007;Ortega-Retuerta et al, 2009). On the other hand, various biological sources, i.e., zooplankton Ortega-Retuerta et al, 2009), cyanobacteria Trichodesmium spp.…”

Section: Factors Controlling the Cdom Level At The Subarctic And The mentioning

confidence: 86%

“…However, the major fraction of CDOM in the open ocean has been 7208 Y. Yamashita et al: Photobleaching as a factor controlling spectral characteristics of CDOM considered to be produced autochthonously through various biological processes Steinberg et al 2004;Ortega-Retuerta et al, 2009;Shank et al, 2010), and the primary local source of CDOM has been assigned to microbial activity Yamashita and Tanoue, 2004). From the global distribution of CDOM, microbially produced CDOM has been considered biologically refractory components with the time scale of the thermohaline circulation (Nelson et al, 2007(Nelson et al, , 2010Yamashita and Tanoue, 2008;Swan et al, 2009), and thus, CDOM has been suggested as a tracer of deep ocean biogeochemical processes and circulation (Nelson et al, 2007(Nelson et al, , 2010.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photobleaching as a factor controlling spectral characteristics of chromophoric dissolved organic matter in open ocean

et al. 2013

View full text Add to dashboard Cite

Abstract. Chromophoric dissolved organic matter (CDOM) ubiquitously occurs in marine environments and plays a significant role in the marine biogeochemical cycles. Basin scale distributions of CDOM have recently been surveyed in the global ocean and indicate that quantity and quality of oceanic CDOM are mainly controlled by in situ production and photobleaching. However, factors controlling the spectral parameters of CDOM in the UV region, i.e., spectral slope of CDOM determined at 275-295 nm (S 275−295 ) and the ratio of two spectral slope parameters (S R ); the ratio of S 275−295 to S 350−400 , have not been well documented. To evaluate the factor controlling the spectral characteristics of CDOM in the UV region in the open ocean, we determined the quantitative and qualitative characteristics of CDOM in the subarctic and subtropical surface waters (5-300 m) of the western North Pacific. Absorption coefficients at 320 nm in the subarctic region were higher than those in the subtropical region throughout surface waters, suggesting that magnitudes of photobleaching were different between the two regions. The values of S 275−295 and S R were also higher in the subtropical region than the subarctic region. The dark microbial incubation showed biodegradation of DOM little affected S 275−295 , but slightly decreased S R . On the other hand, increases in S 275−295 and relative stableness of S R were observed during photo-irradiation incubations respectively. These experimental results indicated that photobleaching of CDOM mainly induced qualitative differences in CDOM at UV region between the subarctic and subtropical surface waters. The results of this study imply that S 275−295 can be used as a tracer of photochemical history of CDOM in the open ocean.

show abstract

Section: Factors Controlling the Cdom Level At The Subarctic And The mentioning

confidence: 79%

Section: Factors Controlling the Cdom Level At The Subarctic And The mentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photobleaching as a factor controlling spectral characteristics of chromophoric dissolved organic matter in open ocean

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Within these autochthonous sources, CDOM can be produced as a by-product of DOM metabolism, mainly by bacteria. But its production by copepods, krill, and other planktonic organisms has also been demonstrated in recent studies (Steinberg et al 2004;Ortega-Retuerta et al 2009). …”

mentioning

confidence: 99%

Production of chromophoric dissolved organic matter by marine phytoplankton

Romera‐Castillo

Sarmento

Álvarez‐Salgado

et al. 2009

Limnology & Oceanography

257

View full text Add to dashboard Cite

Incubation experiments with axenic cultures of four common phytoplankton species of the genera Chaetoceros, Skeletonema, Prorocentrum, and Micromonas were performed to test for the production of fluorescent dissolved organic matter (FDOM) by marine phytoplankton. Our results prove that the four species exuded both fluorescent protein-like and marine humic-like materials in variable amounts, with more production by the diatoms Chaetoceros sp. and Skeletonema costatum and less by Prorocentrum minimum. Whereas the exudation of protein-like substances by healthy phytoplankton cells has been recognized, the in situ production of marine humic-like substances is still a matter of debate. Using axenic cultures, we demonstrate unequivocally that phytoplankton can directly contribute to the autochthonous production of colored humic-like substances in the ocean. Extrapolation of these findings to the field indicates that about 20% of the marine humic-like substances produced in the highly productive coastal upwelling system of the Ría de Vigo could originate from growing phytoplankton. Therefore, the exudation of FDOM by marine phytoplankton should be considered in future studies of the dynamics of colored DOM in marine systems.

show abstract

“…Studies have also shown that inefficiencies in the SO bio-optics algorithms is generated from green band reflectance, leading to an obvious underestimation in chlorophyll-a when using global empirical coefficients [9]. In addition, the blue band is highly affected by CDOM, whose absorption coefficient was reported to occupy 70% of the non-water components in WAP (west of the Antarctica Peninsula) [37]. The absorption spectrum of CDOM has decreasing exponential influence, showing less influence on longer bands.…”

Section: Fluorescence Approach Estimation For Chlorophyll-amentioning

confidence: 99%

Fluorescence-Based Approach to Estimate the Chlorophyll-A Concentration of a Phytoplankton Bloom in Ardley Cove (Antarctica)

Zeng

Fischer

et al. 2017

Remote Sensing

View full text Add to dashboard Cite

Abstract:A phytoplankton bloom occurred in Ardley Cove, King George Island in January 2016, during which maximum chlorophyll-a reached 9.87 mg/m 3 . Records show that blooms have previously not occurred in this area prior to 2010 and the average chlorophyll-a concentration between 1991 and 2009 was less than 2 mg/m 3 . Given the lack of in situ measurements and the poor performance of satellite algorithms in the Southern Ocean and Antarctic waters, we validate and assess several chlorophyll-a algorithms and apply an improved baseline fluorescence approach to examine this bloom event. In situ water properties including in vivo fluorescence, water leaving radiance, and solar irradiance were collected to evaluate satellite algorithms and characterize chlorophyll-a concentration, as well as dominant phytoplankton groups. The results validated the nFLH fluorescence baseline approach, resulting in a good agreement at this high latitude, high chlorophyll-a region with correlation at 59.46%. The dominant phytoplankton group within the bloom was micro-phytoplankton, occupying 79.58% of the total phytoplankton community. Increasing sea ice coverage and sea ice concentration are likely responsible for increasing phytoplankton blooms in the recent decade. Given the profound influence of climate change on sea-ice and phytoplankton dynamics in the region, it is imperative to develop accurate methods of estimating the spatial distribution and concentrations of the increasing occurrence of bloom events.

show abstract

Biogeneration of chromophoric dissolved organic matter by bacteria and krill in the Southern Ocean

Cited by 89 publications

References 35 publications

Photobleaching as a factor controlling spectral characteristics of chromophoric dissolved organic matter in open ocean

Photobleaching as a factor controlling spectral characteristics of chromophoric dissolved organic matter in open ocean

Production of chromophoric dissolved organic matter by marine phytoplankton

Fluorescence-Based Approach to Estimate the Chlorophyll-A Concentration of a Phytoplankton Bloom in Ardley Cove (Antarctica)

Contact Info

Product

Resources

About