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PLoS One. 2017 Apr 26;12(4):e0175808. doi: 10.1371/journal.pone.0175808. eCollection 2017.

Community barcoding reveals little effect of ocean acidification on the composition of coastal plankton communities: Evidence from a long-term mesocosm study in the Gullmar Fjord, Skagerrak.

Author information

1
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Biologische Anstalt Helgoland, Germany.
2
Biodiversity and Climate Research Centre (BiK-F), Senckenberg Gesellschaft für Naturkunde, Frankfurt am Main, Germany.
3
Institute of Ecology, Evolution and Diversity, Faculty of Biological Sciences, Frankfurt am Main, Germany.
4
University Koblenz-Landau, Institute of Environmental Science, Landau in der Pfalz, Germany.
5
GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany.
6
University of Bremen, Bremen, Germany.

Abstract

The acidification of the oceans could potentially alter marine plankton communities with consequences for ecosystem functioning. While several studies have investigated effects of ocean acidification on communities using traditional methods, few have used genetic analyses. Here, we use community barcoding to assess the impact of ocean acidification on the composition of a coastal plankton community in a large scale, in situ, long-term mesocosm experiment. High-throughput sequencing resulted in the identification of a wide range of planktonic taxa (Alveolata, Cryptophyta, Haptophyceae, Fungi, Metazoa, Hydrozoa, Rhizaria, Straminipila, Chlorophyta). Analyses based on predicted operational taxonomical units as well as taxonomical compositions revealed no differences between communities in high CO2 mesocosms (~ 760 μatm) and those exposed to present-day CO2 conditions. Observed shifts in the planktonic community composition were mainly related to seasonal changes in temperature and nutrients. Furthermore, based on our investigations, the elevated CO2 did not affect the intraspecific diversity of the most common mesozooplankter, the calanoid copepod Pseudocalanus acuspes. Nevertheless, accompanying studies found temporary effects attributed to a raise in CO2. Differences in taxa composition between the CO2 treatments could, however, only be observed in a specific period of the experiment. Based on our genetic investigations, no compositional long-term shifts of the plankton communities exposed to elevated CO2 conditions were observed. Thus, we conclude that the compositions of planktonic communities, especially those in coastal areas, remain rather unaffected by increased CO2.

PMID:
28445483
PMCID:
PMC5405915
DOI:
10.1371/journal.pone.0175808
[Indexed for MEDLINE]
Free PMC Article

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