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Étude des interactions Diatomées/copépodes sur l’export de carbone, dans un contexte de changement climatique. : Apports expérimentaux et étude in situ

Abstract : The biological carbon pump transfers CO2 from the atmosphere to the deep ocean as particulate organic matter. By forming aggregates, diatoms contribute strongly to the particle flux. Copepods, in terms of abundance and diversity, dominate zooplankton assemblages, are the main consumers of diatoms and play and key role in the carbon export via faecal pellets egestion. Nutrient limitations mainly occur at the end of phytoplankton blooms, but are also an expected consequence of global warming. The aim of the thesis is to evaluate the role of copepod/diatom interactions on carbon export in a context of climate change. The results obtained show that nutrient limitations affecting diatoms biochemical composition, that influences copepods feeding activity and the export efficiency of faecal pellets. I have also shown that the functional traits of copepods can influence both the aggregates formation and their dynamics. Finally, using data from an oceanographic campaign carried out during the Arctic phytoplankton spring bloom, I observed that silicon limitation after sea ice retreat contributes to the aggregates formation. Copepods, at the end of the bloom migrate under the mixing layer where the aggregates are most abundant, which may suggest that the aggregates could be used as a food.
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https://hal.archives-ouvertes.fr/tel-03114056
Contributor : Jordan Toullec Connect in order to contact the contributor
Submitted on : Monday, January 18, 2021 - 5:18:32 PM
Last modification on : Tuesday, December 6, 2022 - 12:42:13 PM
Long-term archiving on: : Monday, April 19, 2021 - 7:34:53 PM

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Jordan Toullec. Étude des interactions Diatomées/copépodes sur l’export de carbone, dans un contexte de changement climatique. : Apports expérimentaux et étude in situ. Océanographie. Université de Bretagne Occidentale, 2020. Français. ⟨NNT : ⟩. ⟨tel-03114056⟩

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