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Volume 8, issue 4
Biogeosciences, 8, 853–873, 2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 8, 853–873, 2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 08 Apr 2011

Research article | 08 Apr 2011

Modelling planktic foraminifer growth and distribution using an ecophysiological multi-species approach

F. Lombard1,3,*, L. Labeyrie1, E. Michel1, L. Bopp1, E. Cortijo1, S. Retailleau2, H. Howa2, and F. Jorissen2 F. Lombard et al.
  • 1LSCE/IPSL, laboratoire CEA/CNRS/UVSQ, LSCE-Vallée, Bât. 12, avenue de la Terrasse, 91198 Gif-sur-Yvette CEDEX, France
  • 2Laboratory of Recent and Fossil Bio-Indicators (BIAF), Angers University, UPRES EA 2644, 2 Boulevard Lavoisier, 49045 Angers Cedex, France
  • 3Technical University of Denmark, National Institute for Aquatic Resources, Oceanography Section, Kavalergården 6, 2920 Charlottenlund, Denmark
  • *now at: Université de la Méditerranée, CNRS, Laboratoire d'Océanographie Physique et Biogéochimique, LOPB – UMR 6535 Campus de Luminy, Case 901, 13288 MARSEILLE Cedex 9, France

Abstract. We present an eco-physiological model reproducing the growth of eight foraminifer species (Neogloboquadrina pachyderma, Neogloboquadrina incompta, Neogloboquadrina dutertrei, Globigerina bulloides, Globigerinoides ruber, Globigerinoides sacculifer, Globigerinella siphonifera and Orbulina universa). By using the main physiological rates of foraminifers (nutrition, respiration, symbiotic photosynthesis), this model estimates their growth as a function of temperature, light availability, and food concentration. Model parameters are directly derived or calibrated from experimental observations and only the influence of food concentration (estimated via Chlorophyll-a concentration) was calibrated against field observations. Growth rates estimated from the model show positive correlation with observed abundance from plankton net data suggesting close coupling between individual growth and population abundance. This observation was used to directly estimate potential abundance from the model-derived growth. Using satellite data, the model simulate the dominant foraminifer species with a 70.5% efficiency when compared to a data set of 576 field observations worldwide. Using outputs of a biogeochemical model of the global ocean (PISCES) instead of satellite images as forcing variables gives also good results, but with lower efficiency (58.9%). Compared to core tops observations, the model also correctly reproduces the relative worldwide abundance and the diversity of the eight species when using either satellite data either PISCES results. This model allows prediction of the season and water depth at which each species has its maximum abundance potential. This offers promising perspectives for both an improved quantification of paleoceanographic reconstructions and for a better understanding of the foraminiferal role in the marine carbon cycle.

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