Dynamics of particulate organic matter d15N and d13C during spring phytoplankton blooms in a macrotidal ecosystem (Bay of Seine, France)

Savoye, Nicolas; Aminot, Alain; Tréguer, Paul; Fontugne, Michel; Naulet, N.; Kérouel, Roger

doi:10.3354/meps255027

Cited by 145 publications

(117 citation statements)

References 86 publications

(66 reference statements)

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“…POM samples can be characterized or determined for the source of the major contributor(s). The C : N ratio generally ranges between 6 and 10 for phytoplankton, whereas the ratios are between 3 and 6 for zooplankton and bacteria (Savoye et al, 2003; references therein). For terrestrial organic matter, the C : N ratios are normally over 12 (Savoye et al, 2003;references therein).…”

Section: Pom Characterizationmentioning

confidence: 99%

“…The C : N ratio generally ranges between 6 and 10 for phytoplankton, whereas the ratios are between 3 and 6 for zooplankton and bacteria (Savoye et al, 2003; references therein). For terrestrial organic matter, the C : N ratios are normally over 12 (Savoye et al, 2003;references therein). Therefore, it is useful to classify phytoplankton from heterotrophs and terrestrial materials (Lobbes et al, 2000;Savoye et al, 2003;Lee and Whitledge, 2005).…”

Section: Pom Characterizationmentioning

confidence: 99%

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The effects of different environmental factors on the biochemical composition of particulate organic matter in Gwangyang Bay, South Korea

Lee

Kang

et al. 2017

Biogeosciences

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Abstract. The biochemical composition of particulate organic matter (POM) produced through phytoplankton photosynthesis is important in determining food quality for planktonic consumers as well as the physiological conditions of phytoplankton. Major environmental factors controlling the biochemical composition were seasonally investigated in Gwangyang Bay, South Korea, which has only natural conditions (e.g., no artificial dams). Water samples for the biochemical compositions were obtained from three different light depths (100, 30, and 1 %) mainly at three sites in Gwangyang Bay from April 2012 to April 2013. Different biochemical classes (carbohydrates, CHO; proteins, PRT; and lipids, LIP) were extracted, and then the concentrations were determined by the optical density measured with a spectrophotometer. The highest and lowest PRT compositions among the three biochemical classes were found in April 2012 (58.0 %) and August 2012 (21.2 %), whereas the highest and lowest LIP compositions were found in August 2012 (49.0 %) and April 2012 (24.8 %), respectively. The CHO composition was recorded as high in January 2013 and remained above 25 % during the study period. The calorific contents of the food material (FM) ranged from 1.0 to 6.1 Kcal m −3 (annual average ± SD = 2.8 ± 1.1 Kcal m −3 ). Based on a Pearson's correlation coefficient analysis, a major governing factor in the biochemical composition of POM was dissolved inorganic nitrogen loading from the river input in Gwangyang Bay. In conclusion, a relatively larger amount of FM and the higher calorific contents of POM found in this study compared to other regions reflected good nutritive conditions for sustaining productive shellfish and fish populations in Gwangyang Bay. Continuous observations are needed to monitor the marine ecosystem response to potential environmental perturbations in Gwangyang Bay.

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Section: Pom Characterizationmentioning

confidence: 99%

Section: Pom Characterizationmentioning

confidence: 99%

The effects of different environmental factors on the biochemical composition of particulate organic matter in Gwangyang Bay, South Korea

Lee

Kang

et al. 2017

Biogeosciences

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“…This results are easily predictable because coastal and shelf and estuarine areas exhibit high biological activity due to the nutrient input near the river mouths and organic matter recycling in the water column [16]. This heterotrophic activity resulting in high degradation rates at the sediment surface and in the water column produces high dissolved CO 2 concentrations [17].…”

Section: Resultsmentioning

confidence: 99%

Carbon 14 transfer from seawater to the atmosphere through degassing processes in the Bay of Seine (North-West of France)

et al. 2005

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Abstract. COGEMA La Hague nuclear reprocessing plant is located in the North West of Cotentin peninsula near Cherbourg (France). This nuclear plant releases radioelements in atmosphere and in the English Channel. About 8.5 TBq.year -1 of radiocarbon are released as the liquid wastes through a pipe a few kilometres off sea shore, West of the reprocessing plant. Recent studies in the peninsula show anomalous higher radiocarbon contents in vegetation near the coast that have suggested a supplementary marine contribution through the degassing of the

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“…C:N ratios of POM for the 2 sites (5.26 to 6.97) indicated that phytoplankton was the main component of this compartment (Savoye et al 2003). Carbon biomass of POM in ambient water was mainly attributed to particles < 20 µm, and particularly to picophytoplankton (< 2 µm).…”

Section: Spatio-temporal Variations In Food Sourcesmentioning

confidence: 91%

“…This increase in δ 15 N occurred concurrent with increased levels of POC and PON in the water column, indicating enrichment during this period. In temperate areas, blooms are characterized by the progressive nitrogen enrichment of phytoplankton (thus increasing its δ 15 N value) as the nutrient concentration decreases in the water column (Savoye et al 2003, Raimbault et al 2008. At the same time, the POM accumulates heavy nitrogen from zooplankton fecal pellets.…”

Section: Spatio-temporal Variations In Food Sourcesmentioning

confidence: 99%

Trophic relationships between the farmed pearl oyster Pinctada margaritifera and its epibionts revealed by stable isotopes and feeding experiments

Lacoste¹,

Raimbault²,

Harmelin-Vivien³

et al. 2016

Aquacult. Environ. Interact.

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Bivalve cultures support a host of epibionts, mainly suspension feeders, which can compete for food resources with the cultivated bivalves. However, the magnitude of interspecific competition for food in bivalve aquaculture settings remains inconclusive, especially in tropical areas. We investigated the interactions for food between the farmed pearl oyster Pinctada margaritifera and its epibionts, using stable isotope analysis and feeding experiments. Inter-and intraspecific variations of δ 13 C and δ 15 N stable isotope ratios (SIRs) were determined for oysters in the presence or absence of epibionts. The diet of the most abundant epibionts, Herdmania momus and Didemnum sp., was specified using isotope measurements and flow cytometry during feeding experiments, to determine the main phytoplankton groups consumed by these ascidians in natural conditions. The absence of intraspecific variation in SIRs among oysters with or without epibionts suggested that the diet of P. margaritifera was not affected by the presence of epibionts, indicating a reduced diet overlap and no food limitation. The δ 13 C signature of ascidians (−21 ‰) was lower than that of oysters (−18 ‰), indicating a difference in organic matter sources ingested by these filter feeders despite receiving the same food mixture. While the main carbon source of oysters came from large particulate organic matter (POM) > 20 µm, our results showed that the diet of ascidians mainly came from smaller particles (POM < 20 µm) and reflects the composition of ambient water (mainly picophytoplankton < 2 µm), which confirmed their lack of food selectivity. In the studied conditions, food competition between oysters and epibionts, specifically ascidians, was not a limiting factor, in spite of a diet overlap for nanophytoplankton.

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Dynamics of particulate organic matter d15N and d13C during spring phytoplankton blooms in a macrotidal ecosystem (Bay of Seine, France)

Cited by 145 publications

References 86 publications

The effects of different environmental factors on the biochemical composition of particulate organic matter in Gwangyang Bay, South Korea

The effects of different environmental factors on the biochemical composition of particulate organic matter in Gwangyang Bay, South Korea

Carbon 14 transfer from seawater to the atmosphere through degassing processes in the Bay of Seine (North-West of France)

Trophic relationships between the farmed pearl oyster Pinctada margaritifera and its epibionts revealed by stable isotopes and feeding experiments

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