Phytoplankton competition during the spring bloom in four Plankton Functional Type Models
International audience We investigated the mechanisms of phytoplankton competition during the spring bloom, one of the most dramatic seasonal events in lower-trophic level ecosystems, in four state-of-the-art Plankton Functional Type (PFTs) models: PISCES, NEMURO, PlankTOM5 and CCSM-BEC. In particul...
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ftccsdartic:oai:HAL:hal-00806917v1 2023-05-15T17:36:29+02:00 Phytoplankton competition during the spring bloom in four Plankton Functional Type Models Hashioka, T. Vogt, M. Yamanaka, Y. Le Quéré, C. Buitenhuis, E. T. Aita, M. N. Alvain, Séverine Bopp, L. Hirata, T. Lima, I. Sailley, S. Doney, S. C. Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS) 2012 https://hal.archives-ouvertes.fr/hal-00806917 https://doi.org/10.5194/bgd-9-18083-2012 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bgd-9-18083-2012 hal-00806917 https://hal.archives-ouvertes.fr/hal-00806917 doi:10.5194/bgd-9-18083-2012 ISSN: 1810-6277 EISSN: 1810-6285 Biogeosciences Discussions https://hal.archives-ouvertes.fr/hal-00806917 Biogeosciences Discussions, European Geosciences Union, 2012, 12 (9), pp.18083-18129. ⟨10.5194/bgd-9-18083-2012⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2012 ftccsdartic https://doi.org/10.5194/bgd-9-18083-2012 2021-11-28T01:24:42Z International audience We investigated the mechanisms of phytoplankton competition during the spring bloom, one of the most dramatic seasonal events in lower-trophic level ecosystems, in four state-of-the-art Plankton Functional Type (PFTs) models: PISCES, NEMURO, PlankTOM5 and CCSM-BEC. In particular, we investigated the relative importance of different ecophysiological processes on the determination of the community structure, focusing both on the bottom-up and the top-down controls. The models reasonably reproduced the observed global distribution and seasonal variation of phytoplankton biomass. The fraction of diatoms with respect to the total phytoplankton biomass increases with the magnitude of the spring bloom in all models. However, the governing mechanisms differ between models, despite the fact that current PFT models represent ecophysiological processes using the same types of parameterizations. The increasing trend in the percentage of diatoms with increasing bloom magnitude is mainly caused by a stronger nutrient dependence of photosynthesis for diatoms compared to nanophytoplankton (bottom-up control). The difference in the maximum photosynthesis rate plays an important role in NEMURO and PlankTOM5 and determines the absolute values of the percentage of diatoms during the bloom. In CCSM-BEC, the light dependency of photosynthesis plays an important role in the North Atlantic and the Southern Ocean. The grazing pressure by zooplankton (top-down control), however, strongly contributes to the dominance of diatoms in PISCES and CCSM-BEC. The regional differences in the percentage of diatoms in PlankTOM5 are mainly determined by top-down control. These differences in the mechanisms suggest that the response of marine ecosystems to climate change could significantly differ among models, even if the present-day ecosystem is reproduced to a similar degree of confidence. For further understanding of plankton competition and for the prediction of future change in marine ecosystems, it is important to ... Article in Journal/Newspaper North Atlantic Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Southern Ocean |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Hashioka, T. Vogt, M. Yamanaka, Y. Le Quéré, C. Buitenhuis, E. T. Aita, M. N. Alvain, Séverine Bopp, L. Hirata, T. Lima, I. Sailley, S. Doney, S. C. Phytoplankton competition during the spring bloom in four Plankton Functional Type Models |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience We investigated the mechanisms of phytoplankton competition during the spring bloom, one of the most dramatic seasonal events in lower-trophic level ecosystems, in four state-of-the-art Plankton Functional Type (PFTs) models: PISCES, NEMURO, PlankTOM5 and CCSM-BEC. In particular, we investigated the relative importance of different ecophysiological processes on the determination of the community structure, focusing both on the bottom-up and the top-down controls. The models reasonably reproduced the observed global distribution and seasonal variation of phytoplankton biomass. The fraction of diatoms with respect to the total phytoplankton biomass increases with the magnitude of the spring bloom in all models. However, the governing mechanisms differ between models, despite the fact that current PFT models represent ecophysiological processes using the same types of parameterizations. The increasing trend in the percentage of diatoms with increasing bloom magnitude is mainly caused by a stronger nutrient dependence of photosynthesis for diatoms compared to nanophytoplankton (bottom-up control). The difference in the maximum photosynthesis rate plays an important role in NEMURO and PlankTOM5 and determines the absolute values of the percentage of diatoms during the bloom. In CCSM-BEC, the light dependency of photosynthesis plays an important role in the North Atlantic and the Southern Ocean. The grazing pressure by zooplankton (top-down control), however, strongly contributes to the dominance of diatoms in PISCES and CCSM-BEC. The regional differences in the percentage of diatoms in PlankTOM5 are mainly determined by top-down control. These differences in the mechanisms suggest that the response of marine ecosystems to climate change could significantly differ among models, even if the present-day ecosystem is reproduced to a similar degree of confidence. For further understanding of plankton competition and for the prediction of future change in marine ecosystems, it is important to ... |
author2 |
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS) |
format |
Article in Journal/Newspaper |
author |
Hashioka, T. Vogt, M. Yamanaka, Y. Le Quéré, C. Buitenhuis, E. T. Aita, M. N. Alvain, Séverine Bopp, L. Hirata, T. Lima, I. Sailley, S. Doney, S. C. |
author_facet |
Hashioka, T. Vogt, M. Yamanaka, Y. Le Quéré, C. Buitenhuis, E. T. Aita, M. N. Alvain, Séverine Bopp, L. Hirata, T. Lima, I. Sailley, S. Doney, S. C. |
author_sort |
Hashioka, T. |
title |
Phytoplankton competition during the spring bloom in four Plankton Functional Type Models |
title_short |
Phytoplankton competition during the spring bloom in four Plankton Functional Type Models |
title_full |
Phytoplankton competition during the spring bloom in four Plankton Functional Type Models |
title_fullStr |
Phytoplankton competition during the spring bloom in four Plankton Functional Type Models |
title_full_unstemmed |
Phytoplankton competition during the spring bloom in four Plankton Functional Type Models |
title_sort |
phytoplankton competition during the spring bloom in four plankton functional type models |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.archives-ouvertes.fr/hal-00806917 https://doi.org/10.5194/bgd-9-18083-2012 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
ISSN: 1810-6277 EISSN: 1810-6285 Biogeosciences Discussions https://hal.archives-ouvertes.fr/hal-00806917 Biogeosciences Discussions, European Geosciences Union, 2012, 12 (9), pp.18083-18129. ⟨10.5194/bgd-9-18083-2012⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bgd-9-18083-2012 hal-00806917 https://hal.archives-ouvertes.fr/hal-00806917 doi:10.5194/bgd-9-18083-2012 |
op_doi |
https://doi.org/10.5194/bgd-9-18083-2012 |
_version_ |
1766135972606509056 |