Open Access Repository

Simulated ocean acidification reveals winners and losers in coastal phytoplankton

Downloads

Downloads per month over past year

Bach, LT ORCID: 0000-0003-0202-3671, Alvarez-Fernandez, S, Hornick, T, Stuhr, A and Riebesell, U 2017 , 'Simulated ocean acidification reveals winners and losers in coastal phytoplankton' , PLoS ONE, vol. 12, no. 11 , pp. 1-22 , doi: 10.1371/journal.pone.0188198.

[img]
Preview
PDF
133668 - Simula...pdf | Download (7MB)

| Preview

Abstract

The oceans absorb ~25% of the annual anthropogenic CO2 emissions. This causes a shift in the marine carbonate chemistry termed ocean acidification (OA). OA is expected to influence metabolic processes in phytoplankton species but it is unclear how the combination of individual physiological changes alters the structure of entire phytoplankton communities. To investigate this, we deployed ten pelagic mesocosms (volume ~50 m3) for 113 days at the west coast of Sweden and simulated OA (pCO2 = 760 μatm) in five of them while the other five served as controls (380 μatm). We found: (1) Bulk chlorophyll a concentration and 10 out of 16 investigated phytoplankton groups were significantly and mostly positively affected by elevated CO2 concentrations. However, CO2 effects on abundance or biomass were generally subtle and present only during certain succession stages. (2) Some of the CO2-affected phytoplankton groups seemed to respond directly to altered carbonate chemistry (e.g. diatoms) while others (e.g. Synechococcus) were more likely to be indirectly affected through CO2 sensitive competitors or grazers. (3) Picoeukaryotic phytoplankton (0.2–2 μm) showed the clearest and relatively strong positive CO2 responses during several succession stages. We attribute this not only to a CO2 fertilization of their photosynthetic apparatus but also to an increased nutrient competitiveness under acidified (i.e. low pH) conditions. The stimulating influence of high CO2/low pH on picoeukaryote abundance observed in this experiment is strikingly consistent with results from previous studies, suggesting that picoeukaryotes are among the winners in a future ocean.

Item Type: Article
Authors/Creators:Bach, LT and Alvarez-Fernandez, S and Hornick, T and Stuhr, A and Riebesell, U
Keywords: phytoplankton, ocean acidification
Journal or Publication Title: PLoS ONE
Publisher: Public Library of Science
ISSN: 1932-6203
DOI / ID Number: 10.1371/journal.pone.0188198
Copyright Information:

Copyright 2017 Bach et al. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page
TOP