Evidence of spatial and temporal changes in sources of organic matter in estuarine sediments: stable isotope and fatty acid analyses

Bergamino, Leandro; Dalu, Tatenda; Richoux, Nicole B.

doi:10.1007/s10750-014-1853-1

Cited by 38 publications

(22 citation statements)

References 59 publications

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“…This organic matter was likely produced by the high photosynthesis of diatom algae, because the highest values of GPP and NPP, as well as chlorophyll : POC ratio and diatom FA percentage in POC were characteristics of section 1. Indeed, average δ 15 N value in section 1 was close to that of diatom–reach POM in upper estuary of Kowie River (Bergamino et al ). Downstream the Yenisei River δ 15 N values decreased significantly, indicating an increase of contribution of autochthonous organic matter.…”

Section: Discussionmentioning

confidence: 64%

Differences in organic matter and bacterioplankton between sections of the largest Arctic river: Mosaic or continuum?

Gladyshev

Kolmakova

Толомеев

et al. 2015

Limnology & Oceanography

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We studied biogeochemical characteristics, including organic carbon and nitrogen contents, fatty acid (FA) composition, stable isotope ratios, and primary production in conjunction with species composition of bacterioplankton, using next generation sequencing, in the Yenisei River along a distance ∼1800 km. Basing on FA composition of particulate organic matter (POM) and on other indicators of sources of POM, the river was subdivided into four sections. The upper section 1, situated in mountain region, was the net source of high‐quality autochthonous organic matter, produced primarily by diatoms and partly consumed by specialized bacteria species. Section 2 in plain taiga was net sink of high quality allochthonous and autochthonous organic matter, produced by cyanobacteria and green algae. Section 3 was net sink of organic matter, primarily allochthonous, consumed by the specialized species of bacteria. The lowest section 4, situated in tundra, was primarily the conduit of recalcitrant terrestrial organic matter, but also the net source of autochthonous organic matter, produced by diatoms. Biogeochemical traits of sections of the Yenisei River evidently shaped dominant species composition of bacterioplankton of these sections. Regarding the biogeochemical and microbiological data, we concluded that the Yenisei River ecosystem complexly combines features of river mosaic, river continuum, and “neutral pipe.”

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Section: Discussionmentioning

confidence: 64%

Differences in organic matter and bacterioplankton between sections of the largest Arctic river: Mosaic or continuum?

Gladyshev

Kolmakova

Толомеев

et al. 2015

Limnology & Oceanography

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“…High ratios of DHA/EPA and 16:1ω7/16:0 are commonly used as indicators of preferential feeding on dinoflagellates or diatoms, respectively (Dunstan et al 1993, Kharlamenko et al 2001. Because diatoms often lack C 18 polyunsaturated FA (C 18 -PUFA), the presence of these FAs in consumers indicates other food sources, such as vascular plants for which 18:2ω6, 18:3ω3 and 24:0 are considered indicator FAs (Bergamino et al 2014, Wang et al 2014. Here, these FAs could, for instance, relate to the detritus of salt-marsh vegetation or to allochtonous terrestrial matter.…”

Section: Fatty Acidsmentioning

confidence: 99%

Trophodynamics of estuarine intertidal harpacticoid copepods based on stable isotope composition and fatty acid profiles

Cnudde

Moens

Werbrouck

et al. 2015

Mar. Ecol. Prog. Ser.

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“…The adsorption and complexation of FAs to soil and their persistence for long periods of time in the sediment make them unique tracers (Bianchi and Canuel 2011;Bergamino et al 2014).…”

Section: Isotopic Signatures Of Fatty Acids In Soils and Sedimentmentioning

confidence: 99%

Methodological perspectives on the application of compound-specific stable isotope fingerprinting for sediment source apportionment

et al. 2017

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Compound-specific stable isotope (CSSI) fingerprinting of sediment sources is a recently introduced tool to overcome some limitations of conventional approaches for sediment source apportionment. The technique uses the C-13 CSSI signature of plant-derived fatty acids (delta C-13-fatty acids) associated with soil minerals as a tracer. This paper provides methodological perspectives to advance the use of CSSI fingerprinting in combination with stable isotope mixing models (SIMMs) to apportion the relative contributions of different sediment sources (i.e. land uses) to sediments. CSSI fingerprinting allows quantitative estimation of the relative contribution of sediment sources within a catchment at a spatio-temporal resolution, taking into account the following approaches. First, application of CSSI fingerprinting techniques to complex catchments presents particular challenges and calls for well-designed sampling strategies and data handling. Hereby, it is essential to balance the effort required for representative sample collection and analyses against the need to accurately quantify the variability within the system. Second, robustness of the CSSI approach depends on the specificity and conservativeness of the delta C-13-FA fingerprint. Therefore, saturated long-chain (> 20 carbon atoms) FAs, which are biosynthesised exclusively by higher plants and are more stable than the more commonly used short-chain FAs, should be used. Third, given that FA concentrations can vary largely between sources, concentration-dependent SIMMs that are also able to incorporate delta C-13-FA variability should be standard operation procedures to correctly assess the contribution of sediment sources via SIMMs. This paper reflects on the use of delta C-13-FAs in erosion studies and provides recommendations for its application. We strongly advise the use of saturated long-chain (> 20 carbon atoms) FAs as tracers and concentration-dependent Bayesian SIMMs. We anticipate progress in CSSI sediment fingerprinting from two current developments: (i) development of hierarchical Bayesian SIMMs to better address catchment complexity and (ii) incorporation of dual isotope approaches (delta C-13- and delta H-2-FA) to improve estimates of sediment sources

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Evidence of spatial and temporal changes in sources of organic matter in estuarine sediments: stable isotope and fatty acid analyses

Cited by 38 publications

References 59 publications

Differences in organic matter and bacterioplankton between sections of the largest Arctic river: Mosaic or continuum?

Differences in organic matter and bacterioplankton between sections of the largest Arctic river: Mosaic or continuum?

Trophodynamics of estuarine intertidal harpacticoid copepods based on stable isotope composition and fatty acid profiles

Methodological perspectives on the application of compound-specific stable isotope fingerprinting for sediment source apportionment

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