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Influence of Ocean Acidification on a Natural Winter-to-Summer Plankton Succession: First Insights from a Long-Term Mesocosm Study Draw Attention to Periods of Low Nutrient Concentrations

Artikel i vetenskaplig tidskrift
Författare Lennart T Bach
Jan Taucher
Tim Boxhammer
Andrea Ludwig
Samuel Dupont
Eric P Achterberg
Maria Alguero-Muniz
Leif G Anderson
Jessica Bellworthy
Jan Buedenbender
Jan Czerny
Ylva Ericson
Mario Esposito
Matthias Fischer
Mathias Haunost
Dana Hellemann
Henriette G. Horn
Thomas Hornick
Jana Meyer
Michael Sswat
Maren Zark
Ulf Riebesell
Publicerad i PLoS ONE
Volym 11
Nummer/häfte 8
Sidor Article Number: e0159068
ISSN 1932-6203
Publiceringsår 2016
Publicerad vid Institutionen för marina vetenskaper
Linnécentrum för marin evolutionsbiologi (CEMEB)
Institutionen för biologi och miljövetenskap
Sidor Article Number: e0159068
Språk en
Länkar dx.doi.org/10.1371/journal.pone.015...
Ämnesord CARBON-DIOXIDE; TECHNICAL NOTE; GULLMAR-FJORD; MARINE-PHYTOPLANKTON; ION CONCENTRATION; FLOW-CYTOMETRY; SEAWATER; WATER; CO2; PH
Ämneskategorier Geovetenskap och miljövetenskap, Biologiska vetenskaper

Sammanfattning

Every year, the oceans absorb about 30% of anthropogenic carbon dioxide (CO2) leading to a re-equilibration of the marine carbonate system and decreasing seawater pH. Today, there is increasing awareness that these changes-summarized by the term ocean acidification (OA)-could differentially affect the competitive ability of marine organisms, thereby provoking a restructuring of marine ecosystems and biogeochemical element cycles. In winter 2013, we deployed ten pelagic mesocosms in the Gullmar Fjord at the Swedish west coast in order to study the effect of OA on plankton ecology and biogeochemistry under close to natural conditions. Five of the ten mesocosms were left unperturbed and served as controls (similar to 380 mu atm pCO(2)), whereas the others were enriched with CO2-saturated water to simulate realistic end-of-the-century carbonate chemistry conditions (mu 760 mu atm pCO(2)). We ran the experiment for 113 days which allowed us to study the influence of high CO2 on an entire winter-to-summer plankton succession and to investigate the potential of some plankton organisms for evolutionary adaptation to OA in their natural environment. This paper is the first in a PLOS collection and provides a detailed overview on the experimental design, important events, and the key complexities of such a "long-term mesocosm" approach. Furthermore, we analyzed whether simulated end-of-the-century carbonate chemistry conditions could lead to a significant restructuring of the plankton community in the course of the succession. At the level of detail analyzed in this overview paper we found that CO2-induced differences in plankton community composition were non-detectable during most of the succession except for a period where a phytoplankton bloom was fueled by remineralized nutrients. These results indicate: (1) Long-term studies with pelagic ecosystems are necessary to uncover OA-sensitive stages of succession. (2) Plankton communities fueled by regenerated nutrients may be more responsive to changing carbonate chemistry than those having access to high inorganic nutrient concentrations and may deserve particular attention in future studies.

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