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Ocean acidification-induced restructuring of the plankton food web can influence the degradation of sinking particles

Citation

Stange, P and Taucher, J and Bach, LT and Alguero-Muniz, M and Horn, HG and Krebs, L and Boxhammer, T and Nauendorf, AK and Riebesell, U, Ocean acidification-induced restructuring of the plankton food web can influence the degradation of sinking particles, Frontiers in Marine Science, 5 Article 140. ISSN 2296-7745 (2018) [Refereed Article]


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Copyright Statement

Copyright 2018 Stange, Taucher, Bach, Alguero-Muniz, Horn, Krebs, Boxhammer, Nauendorf and Riebesell. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.3389/fmars.2018.00140

Abstract

Ocean acidification (OA) is expected to alter plankton community structure in the future ocean. This, in turn, could change the composition of sinking organic matter and the efficiency of the biological carbon pump. So far, most OA experiments involving entire plankton communities have been conducted in meso- to eutrophic environments. However, recent studies suggest that OA effects may be more pronounced during prolonged periods of nutrient limitation. In this study, we investigated how OA-induced changes in low-nutrient adapted plankton communities of the subtropical North Atlantic Ocean may affect particulate organic matter (POM) standing stocks, POM fluxes, and POM stoichiometry. More specifically, we compared the elemental composition of POM suspended in the water column to the corresponding sinking material collected in sediment traps. Three weeks into the experiment, we simulated a natural upwelling event by adding nutrient-rich deep-water to all mesocosms, which induced a diatom-dominated phytoplankton bloom. Our results show that POM was more efficiently retained in the water column in the highest CO2 treatment levels (>800 μatm pCO2) subsequent to this bloom. We further observed significantly lower C:N and C:P ratios in post-bloom sedimented POM in the highest CO2 treatments, suggesting that degradation processes were less pronounced. This trend is most likely explained by differences in micro- and mesozooplankton abundance during the bloom and post-bloom phase. Overall, this study shows that OA can indirectly alter POM fluxes and stoichiometry in subtropical environments through changes in plankton community structure.

Item Details

Item Type:Refereed Article
Keywords:biological carbon pump, export, ocean acidification, plankton
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological Oceanography
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
UTAS Author:Bach, LT (Dr Lennart Bach)
ID Code:133669
Year Published:2018
Web of Science® Times Cited:6
Deposited By:Ecology and Biodiversity
Deposited On:2019-07-05
Last Modified:2019-08-05
Downloads:2 View Download Statistics

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