The Arctic picoeukaryote <i>Micromonas pusilla</i> benefits synergistically from warming and ocean acidification
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Published:2018-07-18
Issue:14
Volume:15
Page:4353-4365
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ISSN:1726-4189
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Container-title:Biogeosciences
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language:en
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Short-container-title:Biogeosciences
Author:
Hoppe Clara Jule MarieORCID, Flintrop Clara M.ORCID, Rost BjörnORCID
Abstract
Abstract. In the Arctic Ocean, climate change effects such as warming and ocean
acidification (OA) are manifesting faster than in other regions. Yet, we are
lacking a mechanistic understanding of the interactive effects of these
drivers on Arctic primary producers. In the current study, one of the most
abundant species of the Arctic Ocean, the prasinophyte Micromonas pusilla, was exposed to a range of different pCO2 levels at two
temperatures representing realistic current and future scenarios for
nutrient-replete conditions. We observed that warming and OA synergistically
increased growth rates at intermediate to high pCO2 levels.
Furthermore, elevated temperatures shifted the pCO2 optimum of
biomass production to higher levels. Based on changes in cellular composition
and photophysiology, we hypothesise that the observed synergies can be
explained by beneficial effects of warming on carbon fixation in combination
with facilitated carbon acquisition under OA. Our findings help to understand
the higher abundances of picoeukaryotes such as M. pusilla under OA,
as has been observed in many mesocosm studies.
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
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