Effects of rising temperature on pelagic biogeochemistry in mesocosm systems: a comparative analysis of the AQUASHIFT Kiel experiments

A comparative analysis of data, obtained during four indoor-mesocosm experiments with natural spring plankton communities from the Baltic Sea, was conducted to investigate whether biogeochemical cycling is affected by an increase in water temperature of up to 6 °C above present-day conditions. In al...

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Bibliographic Details
Published in:Marine biology 2012-11, Vol.159 (11), p.2503-2518
Main Authors: Wohlers-Zöllner, Julia, Biermann, Antje, Engel, Anja, Dörge, Petra, Lewandowska, Aleksandra M., von Scheibner, Markus, Riebesell, Ulf
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Aquatic ecosystems
Bacteria
Biogeochemical cycles
Biogeochemistry
Biological and medical sciences
Biomedical and Life Sciences
Carbon
Climate system
Climate variability
Dissolved organic carbon
Food webs
Freshwater & Marine Ecology
Fundamental and applied biological sciences. Psychology
General aspects
Life Sciences
Marine
Marine & Freshwater Sciences
Marine biology
Marine plankton
Marine productivity
Microbiology
Ocean temperature
Oceanography
Organic matter
Organic phosphorus
Original Paper
Particulate organic carbon
Particulate organic phosphorus
Phytoplankton
Plankton
Sea water ecosystems
Synecology
Temperature effects
Water temperature
Zoology
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Summary:A comparative analysis of data, obtained during four indoor-mesocosm experiments with natural spring plankton communities from the Baltic Sea, was conducted to investigate whether biogeochemical cycling is affected by an increase in water temperature of up to 6 °C above present-day conditions. In all experiments, warming stimulated in particular heterotrophic bacterial processes and had an accelerating effect on the temporal development of phytoplankton blooms. This was also mirrored in the build-up and partitioning of organic matter between particulate and dissolved phases. Thus, warming increased both the magnitude and rate of dissolved organic carbon (DOC) build-up, whereas the accumulation of particulate organic carbon (POC) and phosphorus (POP) decreased with rising temperature. In concert, the observed temperature-mediated changes in biogeochemical components suggest strong shifts in the functioning of marine pelagic food webs and the ocean’s biological carbon pump, hence providing potential feedback mechanisms to Earth’s climate system.
ISSN:0025-3162
1432-1793
DOI:10.1007/s00227-012-1958-x