Seasonal dynamics and stoichiometry of the planktonic community in the NW Mediterranean Sea: a 3D modeling approach

Alekseenko, Elena; Raybaud, Virginie; Espinasse, Boris; Carlotti, François; Quéguiner, Bernard; Thouvenin, Bénédicte; Garreau, Pierre; Baklouti, Mélika

doi:10.1007/s10236-013-0669-2

Cited by 29 publications

(61 citation statements)

References 87 publications

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“…The latter is represented in terms of abundance and C, N and P concentration. This differs from the model described in Alekseenko et al (2014), in which mesozooplankton is only represented through an abundance and a C concentration. Three nutrients are considered, namely nitrate (NO − 3 ), ammonium (NH + 4 ) and phosphate (DIP).…”

Section: The Biogeochemical Modelmentioning

confidence: 88%

“…1. Except for the new parameters associated with the new features of the model as compared to the original one (Alekseenko et al, 2014), the parameters in common between the two model versions are identical.…”

Section: The Biogeochemical Modelmentioning

confidence: 94%

“…The biogeochemical model used in this study is based on the Eco3M-MED model used for the Mediterranean Sea (Alekseenko et al, 2014). The only modification made on this previous version lies in the addition of diazotrophs and N 2 fixation process to adapt the model to the VAHINE experiment.…”

Section: The Biogeochemical Modelmentioning

confidence: 99%

“…The initial detrital particulate matter was derived by subtracting the total living particulate matter considered in the model form the total particulate matter measured in situ. Due to the lack of data for nano-and microzooplankton, we initiated HNF and CIL abundances using BAC / HNF and CIL / HNF abundance ratios from the literature, as this was made with the Eco3M-MED model for the Mediterranean (Alekseenko et al, 2014). Several ratios were tested in the range of those reported by Tanaka and Rassoulzadegan (2002) and Christaki et al (2011), and the ones providing the best model outputs were used (Table 1).…”

Section: Initial Conditionsmentioning

confidence: 99%

“…The initial values of C, N and P and chlorophyll concentrations for the planktonic compartments were derived from the initial cellular abundance data and from arbitrarily fixed intracellular contents (Table 1). These intracellular contents were thus taken from the Eco3M-MED model (Alekseenko et al, 2014).…”

Section: Initial Conditionsmentioning

confidence: 99%

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Biogeochemical fluxes and fate of diazotroph-derived nitrogen in the food web after a phosphate enrichment: modeling of the VAHINE mesocosms experiment

2016

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Abstract. The VAHINE mesocosm experiment in the oligotrophic waters of the Nouméa lagoon (New Caledonia), where high N 2 fixation rates and abundant diazotroph organisms were observed, aimed to assess the role of the nitrogen input through N 2 fixation in carbon production and export and to study the fate of diazotroph-derived nitrogen (DDN) throughout the planktonic food web. A 1-D vertical biogeochemical mechanistic model was used in addition to the in situ experiment to enrich our understanding of the dynamics of the planktonic ecosystem and the main biogeochemical carbon (C), nitrogen (N) and phosphate (P) fluxes. The mesocosms were intentionally enriched with ∼ 0.8 µmol L −1 of inorganic P to trigger the development of diazotrophs and amplify biogeochemical fluxes. Two simulations were run, one with and the other without the phosphate enrichment. In the P-enriched simulation, N 2 fixation, primary production (PP) and C export increased by 201, 208 and 87 %, respectively, consistent with the trends observed in the mesocosms (+124, +141 and +261 % for N 2 fixation, PP and C export, respectively). In total, 5-10 days were necessary to obtain an increase in primary and export productions after the dissolved inorganic phosphate (DIP) enrichment, thereby suggesting that classical methods (short-term microcosms experiments) used to quantify nutrient limitations of primary production may not be relevant. The model enabled us to monitor the fate of fixed N 2 by providing the proportion of DDN in each compartment (inorganic and organic) of the model over time. At the end of the simulation (25 days), 43 % of the DDN was found in the non-diazotroph organisms, 33 % in diazotrophs, 16 % in the dissolved organic nitrogen pool, 3 % in the particulate detrital organic pool and 5 % in traps, indicating that N 2 fixation was of benefit to non-diazotrophic organisms and contributed to C export.

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Section: The Biogeochemical Modelmentioning

confidence: 88%

Section: The Biogeochemical Modelmentioning

confidence: 94%

Section: The Biogeochemical Modelmentioning

confidence: 99%

Section: Initial Conditionsmentioning

confidence: 99%

Section: Initial Conditionsmentioning

confidence: 99%

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Biogeochemical fluxes and fate of diazotroph-derived nitrogen in the food web after a phosphate enrichment: modeling of the VAHINE mesocosms experiment

2016

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Structure of planktonic food web in the Gulf of Gabès (Southeastern Mediterranean): potential importance of heterotrophic and mixotrophic microzooplankton

et al. 2023

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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An end-to-end model to evaluate the sensitivity of ecosystem indicators to track fishing impacts

Halouani

Loc’h

Shin

et al. 2019

Ecological Indicators

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Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site. ecosystem effects of fishing when the fishing strategy changes. A focus on size-based indicators showed that Large Fish Indicators (40 cm) derived from demersal or all surveyed species were the most suitable to reflect a change in the status of the Gulf of Gabes ecosystem due to fishing pressure.

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Seasonal dynamics and stoichiometry of the planktonic community in the NW Mediterranean Sea: a 3D modeling approach

Cited by 29 publications

References 87 publications

Biogeochemical fluxes and fate of diazotroph-derived nitrogen in the food web after a phosphate enrichment: modeling of the VAHINE mesocosms experiment

Biogeochemical fluxes and fate of diazotroph-derived nitrogen in the food web after a phosphate enrichment: modeling of the VAHINE mesocosms experiment

Structure of planktonic food web in the Gulf of Gabès (Southeastern Mediterranean): potential importance of heterotrophic and mixotrophic microzooplankton

An end-to-end model to evaluate the sensitivity of ecosystem indicators to track fishing impacts

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