Preprints
https://doi.org/10.5194/bg-2022-44
https://doi.org/10.5194/bg-2022-44
 
08 Mar 2022
08 Mar 2022
Status: this preprint is currently under review for the journal BG.

Upwelled plankton community modulates surface bloom succession and nutrient availability in a natural plankton assemblage

Allanah Joy Paul1, Lennart T. Bach2, Javier Arístegui3, Elisabeth von der Esch1, Nauzet Hernández-Hernández3, Jonna Piiparinen4, Laura Ramajo5,6,7, Kristian Spilling4,8, and Ulf Riebesell1 Allanah Joy Paul et al.
  • 1GEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, Germany
  • 2Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania, Australia
  • 3Instituto de Oceanografía y Cambio Global (IOCAG), Universidad de Las Palmas de Gran Canaria (ULPGC), Las Palmas, Spain
  • 4Marine Research Centre, Finnish Environment Institute, Helsinki, Finland
  • 5Center for Advanced Studies in Arid Zones (CEAZA), Coquimbo, Chile
  • 6Departamento de Biología Marina, Facultad de Ciencias del Mar, Universidad Católica del Norte (UCN), Coquimbo, Chile
  • 7Center for Climate and Resilience Research (CR)2, Santiago, Chile
  • 8Centre for Coastal Research, University of Agder, Kristiansand, Norway

Abstract. Upwelling of nutrient rich waters into the sunlit surface layer of the ocean supports high primary productivity in Eastern Boundary Upwelling Systems (EBUS). However, subsurface waters not only contain macronutrients (N, P, Si) but also micronutrients, organic matter, and seed microbial communities that may modify the response to macronutrient inputs via upwelling. These additional factors are often neglected when investigating upwelling impacts on surface ocean productivity. Here, we investigated how different components of upwelled water (macronutrients, organic nutrients, seed communities) drive the response of surface plankton communities to upwelling in the Peruvian coastal zone. Results from our short term (10 days) study show that the most influential drivers in upwelled deep water are 1) the ratio of inorganic nutrients (NOx : PO43-) and 2) the microbial community present that can seed heterogeneity in phytoplankton succession and modify stoichiometry of residual inorganic nutrients after phytoplankton blooms. Hence, this study suggests that phytoplankton succession after upwelling is modified by factors other than the physical supply of inorganic nutrients. This would likely affect trophic transfer and overall productivity in these highly fertile marine ecosystems.

Allanah Joy Paul et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2022-44', Anonymous Referee #3, 18 Mar 2022
  • RC2: 'Comment on bg-2022-44', Anonymous Referee #4, 24 Jun 2022

Allanah Joy Paul et al.

Allanah Joy Paul et al.

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Short summary
We investigated how different deep water chemistry and biology modulate the response of surface plankton communities to upwelling in the Peruvian coastal zone. Our results show that the most influential drivers were the ratio of inorganic nutrients (NOx : PO43-) and the microbial community present in deep water. These led to unexpected responses in the phytoplankton assemblage that could not be predicted by the amount of inorganic nutrients alone.
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