Chemical and Isotopic Composition of the Organic Matter Sources in the Gulf of Gdansk (Southern Baltic Sea)

Maksymowska, D.; Richard, Pierre; Piekarek-Jankowska, Halina; Riera, Pascal

doi:10.1006/ecss.2000.0701

Cited by 171 publications

(94 citation statements)

References 52 publications

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“…The δ 15 N values for benthic diatoms (10.9 ± 0.1 ‰), marine phytoplankton (11.4 ± 0.3 ‰ in the bays and 9.5 ± 0.7 ‰ offshore), macroalgae (14.2 ± 1.0 ‰) and seagrass (14.1 ± 0.1 ‰) were slightly heavier than ranges found for the corresponding producers (2.5 to 9.0 ‰, 3.0 to 12.0 ‰, 5.0 to 12.0 ‰ and 4.0 to 8.0 ‰, respectively) in other coastal environments (Currin et al 1995, Newell et al 1995, Maksymowska et al 2000 and references within). Phytoplankton from the bays displayed a slightly heavier δ 15 N value than those from the offshore areas.…”

mentioning

confidence: 85%

Trophic importance of benthic microalgae to macrozoobenthos in coastal bay systems in Korea: dual stable C and N isotope analyses

Kang¹,

Kim²,

Lee³

et al. 2003

Mar. Ecol. Prog. Ser.

189

104

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mentioning

confidence: 85%

Trophic importance of benthic microalgae to macrozoobenthos in coastal bay systems in Korea: dual stable C and N isotope analyses

Kang¹,

Kim²,

Lee³

et al. 2003

Mar. Ecol. Prog. Ser.

189

104

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“…Riverine POM is habitually composed of a mixture of organic matter derived from autochthonous aquatic production and allochthonous terrestrial detritus of various origins (Maksymowska et al, 2000;Finlay and Kendall 2007;Harmelin-Vivien et al, 2010), which include vascular plants, soil-derived organic matter, freshwater algae and anthropogenic inputs. The proportions of each source vary according to the size of watershed, meteorological factors (such as the occurrence of storms) and land use.…”

Section: Sources Of Pom Transferred To the Nw Mediterranean Seamentioning

confidence: 99%

Biogeochemical characterization of the riverine particulate organic matter transferred to the NW Mediterranean Sea

et al. 2014

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Abstract.A large amount of terrestrial organic matter is annually delivered by rivers to the continental shelf, where this material is either degraded, buried or transferred to the deep sea by hydrodynamic processes such as storms. The relative amount of terrestrial organic matter in the marine sediments is often determined by analysing the stable isotopes (δ 13 C and δ 15 N) and the C / N ratio of organic matter because the various particulate organic matter (POM) sources have distinct isotopic compositions. With the objective to refine and better interpret POM sources in the marine environment, we have characterized monthly terrestrial POM delivered by eight rivers discharging to the NW Mediterranean Sea: the Rhône, Hérault, Orb, Aude, Têt, Fluvià, Ter and Tordera rivers. These rivers were simultaneously sampled from November 2008 to December 2009 and the concentrations of total suspended matter (TSM), particulate organic carbon (POC) and nitrogen (PN), as well as their stable isotopic ratios (δ 13 C and δ 15 N) were determined.During the survey, three rainstorm events with winds coming from the E-NE and the S-SE impacted the NW Mediterranean. Depending on the direction of incoming winds, the fluvial response (amount of water discharge and TSM) was different. Rivers draining the Alps (Rhône River) and Central Massif (Hérault, Orb, and Aude rivers) were mostly impacted by rainstorms associated with winds coming from the S-SE, while rivers draining the Pyrenees (Têt, Fluvià, and Ter rivers) and the Montseny Massif (Tordera River) were impacted by rainstorms associated with winds coming from the E-NE. In addition, the spatial evolution of water discharges shows a different hydrological regime of the Rhône River, with relatively constant and high water stages and TSM concentrations when compared to coastal rivers, characterized by long periods of low water stages. TSM concentrations are positively correlated to water discharges (high water flows resuspended riverbed sediments) but show an inverse relationship with POC and PN relative contents (mostly due to dilution and by low availability of light in river waters during flood events). TSM in most of the coastal rivers have on average 2.5-3 times higher POC and PN mean contents than the Rhône River (8.5 and 1.5 %, respectively, for coastal rivers compared to 3.6 and 0.5 %, respectively, for the Rhône River). This discrepancy may be caused by the long drought periods in small coastal Mediterranean watersheds that enhance the eutrophication in studied coastal rivers. The δ 13 C ratios of organic matter also reflect this discrepancy between high and low water stages with values ranging from −33.2 to −24.5 ‰. The enriched 13 C values (−26.3 ± 0.4 ‰ for the Rhône River and −26.9 ± 1.2 ‰ for coastal rivers), measured during high water stages, express mostly a mixture of terrestrial source (plant remains and soils) whereas

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“…Distinction between terrestrial and autochthonous or marine sources is facilitated by their widely different isotope ratios -typical δ 13 C for land-derived organic matter, when not under the influence of C 4 plants, are −23 ‰ to −30 ‰ and for the organic matter produced in the sea, the ranges are −19 ‰ to −22 ‰ (Smith and Epstein, 1971;Fry and Scherr, 1984;Fontugne and Jouanneau, 1987;Boutton, 1991;Riera et al, 1999;Darnaude et al, 2004). The δ 15 N for terrestrial vascular plants ranges from −5 ‰ to 18 ‰, whereas marine organic matter exhibits δ 15 N values from 3 ‰ to 12 ‰ (Owens, 1987;Wada and Hattori, 1991;Muller and Voss, 1999;Riera et al, 1999;Maksymowska et al, 2000). However, this simple characterization of terrestrial and marine organic matter may not be always valid.…”

Section: Introductionmentioning

confidence: 99%

Intra-annual variability of carbon and nitrogen stable isotopes in suspended organic matter in waters of the western continental shelf of India

et al. 2011

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Abstract. Intra-annual variations of δ 13 C and δ 15 N of watercolumn suspended particulate organic matter (SPOM) have been investigated to understand the biogeochemical cycling of C and N in the Western Continental Shelf of India (WCSI). The key issues being addressed are: how the δ 15 N of SPOM is affected by seasonally varying processes of organic matter production and respiration and how it relates to the δ 15 N of sedimentary organic matter that appears to show a decreasing trend despite an apparent intensification of seasonal oxygen deficiency over the past few decades? A secondary objective was to evaluate the sources of organic carbon. Elemental carbon and nitrogen concentrations, C/N ratios in SPOM, along with ancillary chemical and biological variables including phytoplankton pigment abundance were also determined on a seasonal basis (from March 2007 to September 2008), with the partial exception of the southwest (SW) monsoon period. The results reveal significant shifts in isotopic signatures, especially δ 15 N, of SPOM before and after the onset of SW monsoon. Very low δ 15 N values, reaching a minimum of −4.17 ‰, are found during the pre-monsoon period. Our results provide the first direct evidence for the addition of substantial amounts of isotopically light nitrogen by the diazotrophs, especially Trichodesmium, in the region. The δ 15 N of SPOM is generally lower than the mean value (7.38 ‰) for surficial sediments, presumably because of diagenetic enrichment. The results support the view that sedimentary δ 15 N may not necessarily reflect denitrification intensity in the overlying waters due to diverse sources of nitrogen and variability of its isotopic composition. The observed intra-annual variability of δ 13 C of SPOM during the pre-monsoon and post-monsoon periods is generally small. Phytoplankton production and probably species composition could drive some of the observed changes. The largest changes (depletion of Correspondence to: M. V. Maya (mmayae11@gmail.com) δ 13 C and increase in C/N) appear to occur during the preand post-monsoon seasons, presumably through episodic deposition of terrestrial organic matter from the atmosphere. During the SW monsoon, when a large input of terrestrial organic matter is expected through runoff from land, the C/N ratio remains low, but significant difference is observed between δ 13 C data in 2007 and 2008. Inputs of soil organic matter that may have elemental and isotopic signatures different from those of the conventional (C 3 plant derived) organic matter could explain the constancy of the C/N ratio.

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Chemical and Isotopic Composition of the Organic Matter Sources in the Gulf of Gdansk (Southern Baltic Sea)

Cited by 171 publications

References 52 publications

Trophic importance of benthic microalgae to macrozoobenthos in coastal bay systems in Korea: dual stable C and N isotope analyses

Trophic importance of benthic microalgae to macrozoobenthos in coastal bay systems in Korea: dual stable C and N isotope analyses

Biogeochemical characterization of the riverine particulate organic matter transferred to the NW Mediterranean Sea

Intra-annual variability of carbon and nitrogen stable isotopes in suspended organic matter in waters of the western continental shelf of India

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