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Shift towards larger diatoms in a natural phytoplankton assemblage under combined high-CO2 and warming conditions

Citation

Sett, S and Schulz, KG and Bach, LT and Riebesell, U, Shift towards larger diatoms in a natural phytoplankton assemblage under combined high-CO2 and warming conditions, Journal of Plankton Research, 40, (4) pp. 391-406. ISSN 0142-7873 (2018) [Refereed Article]


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Copyright Statement

The Author(s) 2018. Published by Oxford University Press. This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

DOI: doi:10.1093/plankt/fby018

Abstract

An indoor mesocosm experiment was carried out to investigate the combined effects of ocean acidification and warming on the species composition and biogeochemical element cycling during a winter/spring bloom with a natural phytoplankton assemblage from the Kiel fjord, Germany. The experimental setup consisted of a "Control" (ambient temperature of ~4.8 C and ~535 25 μatm pCO2), a "High-CO2" treatment (ambient temperature and initially 1020 45 μatm pCO2) and a "Greenhouse" treatment (~8.5 C and initially 990 60 μatm pCO2). Nutrient replete conditions prevailed at the beginning of the experiment and light was provided at in situ levels upon reaching pCO2 target levels. A diatom-dominated bloom developed in all treatments with Skeletonema costatum as the dominant species but with an increased abundance and biomass contribution of larger diatom species in the Greenhouse treatment. Conditions in the Greenhouse treatment accelerated bloom development with faster utilization of inorganic nutrients and an earlier peak in phytoplankton biomass compared to the Control and High CO2 but no difference in maximum concentration of particulate organic matter (POM) between treatments. Loss of POM in the Greenhouse treatment, however, was twice as high as in the Control and High CO2 treatment at the end of the experiment, most likely due to an increased proportion of larger diatom species in that treatment. We hypothesize that the combination of warming and acidification can induce shifts in diatom species composition with potential feedbacks on biogeochemical element cycling.

Item Details

Item Type:Refereed Article
Keywords:ocean acidification, ocean warming, phytoplankton
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:133674
Year Published:2018
Web of Science® Times Cited:14
Deposited By:Ecology and Biodiversity
Deposited On:2019-07-05
Last Modified:2019-08-20
Downloads:11 View Download Statistics

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