Spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central Amazon basin
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Abstract
In this study, we investigated the seasonal and spatial pattern of sedimentary organic matter (SOM) in five floodplain lakes of the central Amazon basin (Cabaliana, Janauaca, Canaçari, Mirituba and Curuai) which have different morphologies, hydrodynamics and vegetation coverages. Surface sediments were collected in four hydrological seasons: low water (LW), rising water (RW), high water (HW) and falling water (FW) in 2009 and 2010. We investigated commonly used bulk geochemical tracers such as the C : N ratio and the stable isotopic composition of organic carbon ( δ 13 C org ). These results were compared with lignin phenol parameters as an indicator of vascular plant detritus and branched glycerol dialkyl glycerol tetraethers (brGDGTs) to trace the input of soil organic matter (OM) from land to the aquatic settings. We also applied the crenarchaeol as an indicator of aquatic (rivers and lakes) OM. Our data showed that during the RW and FW seasons, the surface sediments were enriched in lignin and brGDGTs in comparison to other seasons. Our study also indicated that floodplain lake sediments primarily consisted of allochthonous, C 3 plant-derived OM. However, a downstream increase in C 4 macrophyte-derived OM contribution was observed along the gradient of increasing open waters – i.e., from upstream to downstream. Accordingly, we attribute the temporal and spatial difference in SOM composition to the hydrological dynamics between the floodplain lakes and the surrounding flooded forests.
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In forested Amazonian floodplain lakes, local allochthonous inputs are high, comprising most of the suspended organic matter and nutrient inputs.
“In forested Amazonian floodplain lakes, local allochthonous inputs are high, comprising most of the suspended organic matter and nutrient inputs (Ertel et al., 1986; Hedges et al., 1986; Sobrinho et al., 2016).”
From Threshold responses of floating meadow fish communities to floodplain forest cover in the lower Amazon River (2025) · cites this paper as Sobrinho et al., 2016
The Conclusion (section 6; page not provided) identifies vegetation in the lakes’ local catchments as the most important source of sedimentary organic matter. It does not establish that local inputs comprise most suspended organic matter or nutrient inputs; the Introduction (section 1; page not provided) says only that floods intensify nutrient exchange. (LLM, conf=0.88)
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Cites
A RAPID METHOD OF TOTAL LIPID EXTRACTION AND PURIFICATION
Bligh, E. G., & Dyer, W. J. (1959) · Canadian Journal of Biochemistry and Physiology · doi:10.1139/o59-099 · Cited by 54,751 · see citing works
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- Harvey, H. R.: Sources and Cycling of Organic Matter in the Marine Water Column, in: Marine Organic Matter: Biomarkers, Isotopes and DNA, edited by: Volkman, J. K., Springer, New York, USA, 2006.
- Junk, W. J.: The Central Amazon Floodplain: Ecology of a Pulsing System, Ecological Studies, Springer, Berlin, Germany, p. 529, 1997.
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Grinstead, S., Arantes, C. C., Winemiller, K. O., Kelso‐Winemiller, L. C., de Oliveira, J. A., Petrere, M., & Freitas, C. E. C. (2025) · Conservation Biology · doi:10.1111/cobi.70110
- Authors
- Sobrinho, R. L., Bernardes, M. C., Abril, G., Kim, J.-H., Zell, C. I., Mortillaro, J.-M., Meziane, T., Moreira-Turcq, P., & Sinninghe Damsté, J. S.
- Affiliations
- Universidade Federal Fluminense (BR)
- Centre National de la Recherche Scientifique (FR)
- Royal Netherlands Institute for Sea Research (NL)
- Venue
- Biogeosciences
- Publisher
- Copernicus GmbH
- Published
- 2016-01-22
- Volume
- 13
- Issue
- 2
- Pages
- 467-482
- ISSN
- 1726-4170 (ISSN-L)
- 1726-4189
- OpenAlex
- W2120473657
- Cited by
- 22
- References
- 1
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 1 · 2023: 3 · 2022: 3 · 2020: 1 · 2019: 2 · 2018: 1 · 2017: 1 · 2016: 4 · 2015: 1
- FWCI
- 2.33
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Biogeosciences (publishedVersion, cc-by)
- NIOZ Publications (Royal Netherlands Institute for Sea Research) (publishedVersion, other-oa)
- Flanders Marine Institute (Flanders Marine Institute) (submittedVersion, other-oa)
- HAL (submittedVersion, other-oa)
- HAL (submittedVersion, cc-by)
- Agritrop (Cirad) (submittedVersion, cc-by)
- Agritrop (Cirad) (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Utrecht University Repository (Utrecht University) (submittedVersion, other-oa)
- Oskar-Bordeaux (Universite de Bordeaux) (submittedVersion, cc-by)
- Funders
- European Commission (2007–2013, FP7 2007-2013, 226600, FP7/2007)
- Agence Nationale de la Recherche
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (573.601/2008–9)
- FP7 Ideas: European Research Council (226600)
- Topics
- Physical Sciences › Environmental Science › Ecology › Isotope Analysis in Ecology
- Physical Sciences › Environmental Science › Ecology › Peatlands and Wetlands Ecology
- Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
- Keywords
- sediment organic matter, floodplain lakes, Amazon basin, seasonal variation, spatial variability, lignin phenols, brGDGTs, crenarchaeol, stable carbon isotopes, C/N ratio, allochthonous organic matter, C3 and C4 plants, aquatic plants, flooded forest, hydrological dynamics, surface sediments
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