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Title: Upwelled plankton community modulates surface bloom succession and nutrient availability in a natural plankton assemblage
Authors: Paul, Allanah Joy
Bach, Lennart T.
Arístegui Ruiz, Javier 
von der Esch, Elisabeth
Hernández Hernández, Nauzet 
Piiparinen, Jonna
Ramajo, Laura
Spilling, Kristian
Riebesell, Ulf
UNESCO Clasification: 251001 Oceanografía biológica
Issue Date: 2022
Journal: Biogeosciences 
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.
ISSN: 1726-4170
DOI: 10.5194/bg-19-5911-2022
Source: Biogeosciences [ISSN 1726-4170], v. 19 (24), p. 5911-5926, (Diciembre 2022)
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