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Publication . Article . Preprint . 2019

Impacts of reduced inorganic N:P ratio on three distinct plankton communities in the Humboldt upwelling system

Kristian Spilling; Maria Teresa Camarena-Gomez; Tobias Lipsewers; Alícia Martinez-Varela; Francisco Díaz-Rosas; Eeva Eronen-Rasimus; Nelson R.F.A. Silva; +2 Authors
Open Access
Published: 14 Feb 2019
Publisher: Springer Nature

The ratio of inorganic nitrogen to phosphorus (NP) is projected to decrease in the Eastern Boundary Upwelling Systems (EBUS) due to warming of the surface waters. In an enclosure experiment, we employed two levels of inorganic NP ratios (10 and 5) for three distinct plankton communities collected along the coast of central Chile (33°S). The primary effect of the NP treatment was related to different concentrations of NO3, which directly influenced the biomass of phytoplankton. In addition, low inorganic NP ratio reduced the seston NP and Chl a-C ratios, and there were some effects on the plankton community composition, e.g., benefitting Synechococcus spp. in some communities. One of the communities was clearly top-down controlled and trophic transfer to grazers was up to 5.8% during the 12 day experiment. Overall, the initial, natural plankton community composition was more important for seston stoichiometry and trophic transfer than the manipulation of the inorganic NP ratio, highlighting the importance of plankton community structure for marine ecosystem functioning. © 2019, The Author(s).

Financial support for this study came from the EU FP7 research infrastructure initiative ASSEMBLE (grant agreement no. 227799). Further support came from the Academy of Finland (decision no 259164) and the Walter and Andrée de Nottbeck foundation (KS and TC). The InFlux cytometer was purchased with financing by the FONDEQUIP program (grant EQM130267, CONICYT).

Peer reviewed

Subjects by Vocabulary

Microsoft Academic Graph classification: Trophic level Phytoplankton Ecology Plankton Seston Community structure Synechococcus biology.organism_classification biology Upwelling Biomass (ecology) Environmental science Ecosystem Environmental chemistry

Medical Subject Headings: fungi


Biomass, Chile, Upwelling, Engraulis ringens, Ecology, Aquatic Science, Ecology, Evolution, Behavior and Systematics, Biomass, Chile, Upwelling, Engraulis ringens, [SDV.EE.BIO]Life Sciences [q-bio]/Ecology, environment/Bioclimatology, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, HYDROGRAPHIC CONDITIONS, INTERANNUAL VARIABILITY, NATURAL ASSEMBLAGES, NITROGEN-FIXATION, NUTRIENT, ORGANIC-MATTER, PHOSPHORUS, PHYTOPLANKTON, STOICHIOMETRY, TROPICAL PACIFIC, 1181 Ecology, evolutionary biology

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Funded by
AKA| Changing phytoplankton community composition and its effect on biogeochemical fluxes in the Baltic Sea, EC| ASSEMBLE
Association of European Marine Biological Laboratories
  • Funder: European Commission (EC)
  • Project Code: 227799
  • Funding stream: FP7 | SP4 | INFRA
Related to Research communities
European Marine Science Marine Environmental Science : Association of European marine biological laboratories
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