Stable carbon and nitrogen isotope ratios as tools to evaluate the nature of particulate organic matter in the Venice lagoon

Berto, Daniela; Rampazzo, Federico; Noventa, Seta; Cacciatore, Federica; Gabellini, Massimo; Aubry, Fabrizio Bernardi; Girolimetto, A.; Brusà, Rossella Boscolo

doi:10.1016/j.ecss.2013.06.021

Cited by 51 publications

(48 citation statements)

References 47 publications

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“…Moreover, uptake via roots has an indirect effect on inorganic C acquisition by the shoots (Raven et al, 2002). Values of d 13 C in macrophytes and in suspended particulate organic matter (POM) sampled in 2011-2012 in the Lagoon of Venice (Berto et al, 2013) showed overall agreement with our results for macrophytes and SOM, respectively. d 15 N values in primary producers reflect the nitrogen isotopic composition of dissolved inorganic nitrogen (DIN), mainly NO 3 À , NH 4 + and atmospheric N 2 values.…”

Section: Primary Producers and Sestonsupporting

confidence: 92%

“…Values of d 13 C measured in bivalves (and particularly in epifaunal species Mytilus galloprovincialis and Crassostrea gigas) are in general agreement with the annual mean reported for POM in the Lagoon of Venice by Berto et al (2013). The d 15 N values in bivalves were also similar to the annual mean value of the POM, although one would expect a value higher by about 3.4‰.…”

Section: Consumerssupporting

confidence: 80%

“…In summer, d 15 N in macroalgae may strongly increase due to intensive denitrification in sediments resulting in increased assimilation of nitrogen enriched in 15 N (Baeta et al, 2009). Seasonal variability in suspended POM in the Lagoon of Venice documented by Berto et al (2013) confirms the high variability of d 15 N values in plants.…”

Section: Bias In Trophic Position Related To Baseline D 15 N Variabilitysupporting

confidence: 65%

“…The d 15 N values in bivalves were also similar to the annual mean value of the POM, although one would expect a value higher by about 3.4‰. However, the large spatial variability of d 15 N values in POM reported by Berto et al (2013), precludes a meaningful comparison of mean values in POM from the whole Lagoon with the values for bivalves from a specific area. The mean d 15 N value for local SOM suggests that resuspended sediments are a major source of nutrients for filter feeders.…”

Section: Consumerssupporting

confidence: 60%

“…In any case, the sampling method would not have allowed the determination of the isotopic composition of phytoplankton alone which, in the northern part of the Lagoon of Venice makes up about one quarter of the particulate organic carbon (Sorokin et al, 2002, data from August to September 1996. It should be noted that d 15 N in suspended POM collected by Berto et al (2013) varied seasonally with the average values ranging from about 10‰ in May to about 1‰ in February. These large seasonal d 15 N variations in POM illustrate the necessity of using organisms integrating the d 15 N values over the year in order to establish an adequate baseline for trophic chain studies.…”

Section: Primary Producers and Sestonmentioning

confidence: 98%

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Mercury in the food chain of the Lagoon of Venice, Italy

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Section: Primary Producers and Sestonsupporting

confidence: 92%

Section: Consumerssupporting

confidence: 80%

Section: Bias In Trophic Position Related To Baseline D 15 N Variabilitysupporting

confidence: 65%

Section: Consumerssupporting

confidence: 60%

Section: Primary Producers and Sestonmentioning

confidence: 98%

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A study on the relationship between metabolism of Cyanobacteria and chemical oxygen demand in Dianchi Lake, China

Zhang

et al. 2019

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Recent increases in concentrations of chemical oxygen demand (COD‐Cr) in Dianchi Lake, China, is an important factor affecting its water quality. Large volumes of cyanobacteria algae have also been recorded in this lake; its growth, distribution and metabolism are believed to directly or indirectly affect water quality. The relationship between metabolism of cyanobacteria and COD‐Cr in Dianchi Lake, and the causes of this relationship, are examined in this study. Results show that the increase of COD‐Cr concentration is closely related to the metabolism of algae, and that organic substances containing nitrogen and sugars, produced by metabolism, contribute to an increase of COD‐Cr to a certain extent. The characteristics of fluorescence spectra of dissolved organic matter (DOM) in the Waihai area of Dianchi Lake are similar to those of algae culture water, and their dominant substances are protein‐like substances. Algae release organic substances into water during its growth cycle and extracellular organic substances are mainly released during its normal growth and metabolism stages. Once algae cells enter the decline stage, internal organic matter is released during the dying and decomposition stages, resulting in a distinct increase of COD‐Cr. A high concentration of organic matter is present in Dianchi Lake sediments, dominated by native organic matter predominantly derived from aquatic plants and plankton. This finding indicates a potential long‐term risk of organic pollutants being released from dead algae cells into the lake. Practitioner points There is a distinct positive correlation between COD‐Cr and Chl‐a concentration in Dianchi Lake. Organic substances containing nitrogen and sugars produced by algae metabolism contributed to COD‐Cr. The cells die and decompose organic matter content in the water substantially increases, resulting in a distinct increase of COD‐Cr. Weight >20 kDa are mainly released into the water body during the decomposition of algae cells after mortality. Organic matter content in the water substantially increases, resulting in a distinct increase of COD‐Cr.

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Predominance of phytoplankton-derived dissolved and particulate organic carbon in a highly eutrophic tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)

et al. 2017

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We investigate the carbon dynamics in Guanabara Bay, an eutrophic tropical coastal embayment surrounded by the megacity of Rio de Janeiro (southeast coast of Brazil). Nine sampling campaigns were conducted for dissolved, particulate and total organic carbon (DOC, POC and TOC), dissolved inorganic carbon (DIC), partial pressure of CO 2 (pCO 2 ), chlorophyll a (Chl a), pheo-pigments and ancillary parameters. Highest DOC, POC and Chl a concentrations were found in confined-shallow regions of the bay during the summer period with strong pCO 2 undersaturation, and DOC reached 82 mg L -1 , POC 152 mg L -1 , and Chl a 800 lg L -1 . Spatially and temporally, POC and DOC concentrations varied positively with total pigments, and negatively with DIC. Strong linear correlations between these parameters indicate that the production of TOC translates to an equivalent uptake in DIC, with 85% of the POC and about 50% of the DOC being of phytoplanktonic origin. Despite the shallow depths of the bay, surface waters were enriched in POC and DOC relative to bottom waters in periods of high thermohaline stratification. The seasonal accumulation of phytoplankton-derived TOC in the surface waters reached about 105 g C m -2 year -1 , representing between 8 and 40% of the net primary production. The calculated turnover time of organic carbon was 117 and 34 days during winter and summer, respectively. Our results indicate that eutrophication of coastal bays in the tropics can generate large stocks of planktonic biomass and detrital organic carbon which are permanently being produced and partially degraded and buried in sediments.

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Stable carbon and nitrogen isotope ratios as tools to evaluate the nature of particulate organic matter in the Venice lagoon

Cited by 51 publications

References 47 publications

Mercury in the food chain of the Lagoon of Venice, Italy

Mercury in the food chain of the Lagoon of Venice, Italy

A study on the relationship between metabolism of Cyanobacteria and chemical oxygen demand in Dianchi Lake, China

Predominance of phytoplankton-derived dissolved and particulate organic carbon in a highly eutrophic tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)

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