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Impact of microphytobenthos on the sediment biogeochemical cycles: A modeling approach

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  • Hochard, Sébastien
  • Pinazo, Christel
  • Grenz, Christian
  • Evans, Jessica L. Burton
  • Pringault, Olivier

Abstract

In marine biogeochemical modeling, the sediment is usually represented by diagenetic models, but in shallow ecosystems these models are incomplete, because they do not take into account the benthic primary production. While microphytobenthos (MPB) is known to strongly impact mineralization pathways and nutrient fluxes, MPB is rarely integrated as an explicit variable. To investigate the impact of microphytobenthos on early diagenesis in sediment, we built a fine-scale dynamic model, based on the diagenetic model OMEXDIA and including MPB and associated processes. The model outputs were similar to a data set of MPB-colonized sediment sampled in Florida Bay, suggesting that the model can recreate a realistic situation. The model showed that MPB activities induced a strong diurnal rhythm on concentration profiles, fluxes, and mineralization processes. When MPB was present at the sediment surface, the total mineralization was strongly enhanced thanks to the supply of labile organic matter. In contrast, coupled nitrification–denitrification was inhibited by a factor of 3.8. This inhibition can be explained by the competition for nitrate and ammonium between MPB and bacteria. Nitrogen uptake of MPB represented 96% of the daily supply of dissolved inorganic nitrogen. This was more than 50 times greater than N consumption by denitrification. With MPB, sediment nitrogen flux to the water column was reduced by a factor of 70, suggesting that sediment colonized by MPB represents a minor source of nutrients for phytoplankton and bacterioplankton. Results showed that current diagenetic models are not well-suited for shallow ecosystems with significant MPB primary production.

Suggested Citation

  • Hochard, Sébastien & Pinazo, Christel & Grenz, Christian & Evans, Jessica L. Burton & Pringault, Olivier, 2010. "Impact of microphytobenthos on the sediment biogeochemical cycles: A modeling approach," Ecological Modelling, Elsevier, vol. 221(13), pages 1687-1701.
    • Handle: RePEc:eee:ecomod:v:221:y:2010:i:13:p:1687-1701
    DOI: 10.1016/j.ecolmodel.2010.04.002
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    References listed on IDEAS

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    1. Guarini, Jean-Marc & Sari, Nadir & Moritz, Charlotte, 2008. "Modelling the dynamics of the microalgal biomass in semi-enclosed shallow-water ecosystems," Ecological Modelling, Elsevier, vol. 211(3), pages 267-278.
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    1. Hochard, Sébastien & Pinazo, Christel & Rochelle-Newall, Emma & Pringault, Olivier, 2012. "Benthic pelagic coupling in a shallow oligotrophic ecosystem: Importance of microphytobenthos and physical forcing," Ecological Modelling, Elsevier, vol. 247(C), pages 307-318.
    2. das Neves, Patricia Bittencourt Tavares & Blanco, Claudio José Cavalcante & Montenegro Duarte, André Augusto Azevedo & das Neves, Filipe Bittencourt Souza & das Neves, Isabela Bittencourt Souza & de P, 2021. "Amazon rainforest deforestation influenced by clandestine and regular roadway network," Land Use Policy, Elsevier, vol. 108(C).
    3. Ertürk, Ali & Sakurova, Ilona & Zilius, Mindaugas & Zemlys, Petras & Umgiesser, Georg & Kaynaroglu, Burak & Pilkaitytė, Renata & Razinkovas-Baziukas, Artūras, 2023. "Development of a pelagic biogeochemical model with enhanced computational performance by optimizing ecological complexity and spatial resolution," Ecological Modelling, Elsevier, vol. 486(C).
    4. Serôdio, João & Bastos, Alexandra & Morelle, Jérôme & Frankenbach, Silja, 2023. "Light niche construction: Motility of sediment-inhabiting diatoms determines the experienced light environment," Ecological Modelling, Elsevier, vol. 481(C).

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