Long-chain diols in rivers: distribution and potential biological sources
Lattaud, J.; Kirkels, F.; Peterse, F.; Freymond, C.V.; Eglinton, T.I.; Hefter, J.; Mollenhauer, G.; Balzano, S.; Villanueva, L.; van der Meer, M.T.J.; Hopmans, E.C.; Sinninghe Damsté, J.S.; Schouten, S. (2018). Long-chain diols in rivers: distribution and potential biological sources. Biogeosciences 15(13): 4147-4161. https://doi.org/10.5194/bg-15-4147-2018
Additional data:
In: Gattuso, J.P.; Kesselmeier, J. (Ed.) Biogeosciences. Copernicus Publications: Göttingen. ISSN 1726-4170; e-ISSN 1726-4189, more
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| Authors | | Top |
- Lattaud, J., more
- Kirkels, F.
- Peterse, F.
- Freymond, C.V.
- Eglinton, T.I.
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- Hefter, J.
- Mollenhauer, G.
- Balzano, S., more
- Villanueva, L., more
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- van der Meer, M.T.J., more
- Hopmans, E.C., more
- Sinninghe Damsté, J.S., more
- Schouten, S., more
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| Abstract |
Long-chain diols (LCDs) occur widespread in marineenvironments and also in lakes and rivers. Transportof LCDs from rivers may impact the distribution of LCDsin coastal environments, however relatively little is knownabout the distribution and biological sources of LCDs in riversystems. In this study, we investigated the distribution ofLCDs in suspended particulate matter (SPM) of three riversystems (Godavari, Danube, and Rhine) in relation with precipitation, temperature, and source catchments. The dominant long-chain diol is the C32 1,15-diol followed by the C30 1,15-diol in all studied river systems. In regions influenced by marine waters, such as delta systems, the fractional abundance of the C30 1,15-diol is substantially higher than in the river itself, suggesting different LCD producers in marine and freshwater environments. A change in the LCD distributionalong the downstream transects of the rivers studiedwas not observed. However, an effect of river flow is observed;i.e., the concentration of the C32 1,15-diol is higher in stagnant waters such as reservoirs and during seasons with river low stands. A seasonal change in the LCD distribution was observed in the Rhine, likely due to a change inthe producers. Eukaryotic diversity analysis by 18S rRNAgene sequencing of SPM from the Rhine showed extremelylow abundances of sequences (i.e., <0.32% of total reads)related to known algal LCD producers. Furthermore, incubationof the river water with 13C-labeled bicarbonate didnot result in 13C incorporation into LCDs. This indicatesthat the LCDs present are mainly of fossil origin in the fastflowing part of the Rhine. Overall, our results suggest thatthe LCD producers in rivers predominantly reside in lakes orside ponds that are part of the river system. |
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