Production of bioavailable and refractory dissolved organic matter by coastal heterotrophic microbial populations

Lønborg, Christian; Álvarez-Salgado, Xosé A.; Davidson, Keith; Miller, Axel E. J.

doi:10.1016/j.ecss.2009.02.026

Cited by 68 publications

(50 citation statements)

References 28 publications

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“…This process could be monitored and pre-evaluated by EEMs. The fluorescent spectra provided visible evidence of the degradation of BDOC and production of RDOC, consistent with results from in situ profiles (Yamashita and Tanoue, 2008) and incubations (Lønborg et al, 2009(Lønborg et al, , 2010Jørgensen et al, 2014).…”

Section: Bio-transformation From Bdoc To Rdoc -Implications For the Rsupporting

confidence: 86%

Bioavailability of dissolved organic carbon linked with the regional carbon cycle in the East China Sea

Gan

Zhang

2016

Deep Sea Research Part II: Topical Studies in Oceanography

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Section: Bio-transformation From Bdoc To Rdoc -Implications For the Rsupporting

confidence: 86%

Bioavailability of dissolved organic carbon linked with the regional carbon cycle in the East China Sea

Gan

Zhang

2016

Deep Sea Research Part II: Topical Studies in Oceanography

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“…The divergence between our results and those previously published (e.g. Conan et al 2007, Lønborg et al 2009) may be due to the fact that we quantified gross production of DOM whereas others quantified net production (production minus consumption). The high proportion of autotrophic production ending up as DOC is due to 2 factors: (1) all organisms released a considerable fraction of consumed or fixed C as DOC, and (2) there is recycling of DOC within the food web because organic C leaves the food web only by respiration and export.…”

Section: How Large a Share Of Primary Production Ends Up As Doc And Hcontrasting

confidence: 57%

“…Fig. 2) were lost, and the correlations between rates should be interpreted with caution as they do not cover the time resolution of these processes (see Lønborg et al 2009). However, the use of averages for the whole experimental period results in more conservative conclusions and they should therefore be more robust.…”

Section: Methodological Aspectsmentioning

confidence: 99%

Carbon, nitrogen and phosphorus resource supply and utilisation for coastal planktonic heterotrophic bacteria in a gradient of nutrient loading

Vadstein

Andersen

Reinertsen

et al. 2012

Mar. Ecol. Prog. Ser.

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Data from 7 mesocosms with a gradient in daily nutrient loading rate (L N ) and inverse modelling were used to estimate all C, N and P flows in an idealised food web. The gradient in L N created autotrophic production (AP) of 7 to 314 µg C l −1 d −1 (mean values over 18 d). The production of dissolved organic C (DOC) decreased from 240 to 40% of AP, and was dominated by heterotrophs (80 to 58%), with heterotrophic bacteria (BAC) producing 48 ± 8% (means ± SD) by excretion or lysis. The consumption of DOC by BAC was 133 to 86% of AP, and DOC accumulated when experimental L N ≥ natural L N . C of BAC origin constituted 5.5 to 0.2% of the C consumed by copepods. The production of dissolved N and P was mainly by heterotrophs (92 ± 2% of DN, 92 ± 4% DP), but autotrophs produced 26 ± 7% of dissolved organic N (DON) and 21 ± 8% of dissolved organic P (DOP). For the production of inorganic N and P (DIN and DIP, respectively), BAC predators produced > 50% of DIN and > 70% of DIP at low or moderate L N (averages 37 ± 16% of DIN and 66 ± 14% of DIP). The contribution by BAC was low for DIN (12 ± 6%) and zero for DIP. For the re-mineralisation of N and P, the significance of BAC was as N and P rich food particles. DOP accumulated more than DOC, despite the high demand for P. Turnover time of dissolved organic matter (DOM) decreased from around 80 to 12 d with increasing L N . These data provide new insights into the role of various functional groups of organisms for the cycling of DOM, and to the differences in C, N and P cycling.

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“…Recently, it was shown that the organic material generated by microbial populations is a mixture of refractory and bioavailable DOM (Lonborg et al 2009). Even if the labile portion of DOM has a limited residence time (due to microbial degradation), the increase of CDOM absorption at the deep chlorophyll maximum could be associated to a production of semi-labile and/or refractory CDOM by phytoplankton and bacterial communities.…”

Section: Relationships Between Field Chlorophyll a And Cdom Optical Pmentioning

confidence: 99%

Sensitivity analysis of CDOM spectral slope in artificial and natural samples: an application in the central eastern Mediterranean Basin

et al. 2010

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In the past two decades, optical properties of chromophoric dissolved organic matter (CDOM) in marine environments have been extensively studied. Many of these studies report CDOM properties for the offshore environment where this complex mixture of optically active compounds is strongly diluted. Nevertheless, autochthonous and allochthonous sources have been identified and sinks related to photodegradation and bacterial activity have been demonstrated. The calculation of the spectral slope of the CDOM absorption curve has been proven to be useful and is often reported. However, a rigorous uncertainty analysis of the slope calculation is rarely reported. In this paper, we propose a method to evaluate the uncertainty of CDOM spectral slope calculated between 270 and 400 nm, using both naturally sampled and artificial solutions. We use these results to study the ultra-oligotrophic waters of the Mediterranean Sea (central eastern basin), where little is known about CDOM spatial distribution. We show that dilutions of both artificial and natural samples produce a Gaussian distribution of spectral slopes, indicating that consistent values may be determined, with a typical uncertainty of ±0.0004 nm -1 when absorption at 300 nm was greater then 0.1 m -1 (0.1 m pathlength). Comparing the distribution of spectral slopes from central eastern basin samples to a Gaussian distribution, we show differences between measurements that were significantly different. These values allow us to distinguish possible sources (algal derived CDOM), sinks (e.g. photo-bleaching) at different depths. We propose a subdivision of CDOM compounds into refractory and semilabile/refractory pools and evaluate the CDOM spectral slope of algal derived CDOM released at or near deep chlorophyll maximum.

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Production of bioavailable and refractory dissolved organic matter by coastal heterotrophic microbial populations

Cited by 68 publications

References 28 publications

Bioavailability of dissolved organic carbon linked with the regional carbon cycle in the East China Sea

Bioavailability of dissolved organic carbon linked with the regional carbon cycle in the East China Sea

Carbon, nitrogen and phosphorus resource supply and utilisation for coastal planktonic heterotrophic bacteria in a gradient of nutrient loading

Sensitivity analysis of CDOM spectral slope in artificial and natural samples: an application in the central eastern Mediterranean Basin

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