Revaluating ocean warming impacts on global phytoplankton

Global satellite observations document expansions of the low-chlorophyll central ocean gyres and an overall inverse relationship between anomalies in sea surface temperature and phytoplankton chlorophyll concentrations. These findings can provide an invaluable glimpse into potential future ocean cha...

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Bibliographic Details
Published in:Nature climate change 2016-03, Vol.6 (3), p.323-330
Main Authors: Behrenfeld, Michael J., O’Malley, Robert T., Boss, Emmanuel S., Westberry, Toby K., Graff, Jason R., Halsey, Kimberly H., Milligan, Allen J., Siegel, David A., Brown, Matthew B.
Format: Article
Language:English
Subjects:
631/158/2165/2457
631/158/2446/2447
704/106/829/826
Carbon dioxide
Chlorophyll
Climate Change
Climate Change/Climate Change Impacts
Environment
Environmental Law/Policy/Ecojustice
Gyres
Ocean warming
Photosynthesis
Physiological responses
Phytoplankton
Pigmentation
Sea surface temperature
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Summary:Global satellite observations document expansions of the low-chlorophyll central ocean gyres and an overall inverse relationship between anomalies in sea surface temperature and phytoplankton chlorophyll concentrations. These findings can provide an invaluable glimpse into potential future ocean changes, but only if the story they tell is accurately interpreted. Chlorophyll is not simply a measure of phytoplankton biomass, but also registers changes in intracellular pigmentation arising from light-driven (photoacclimation) and nutrient-driven physiological responses. Here, we show that the photoacclimation response is an important component of temporal chlorophyll variability across the global ocean. This attribution implies that contemporary relationships between chlorophyll changes and ocean warming are not indicative of proportional changes in productivity, as light-driven decreases in chlorophyll can be associated with constant or even increased photosynthesis. Extension of these results to future change, however, requires further evaluation of how the multifaceted stressors of a warmer, higher-CO 2 world will impact plankton communities. Satellite measurements of chlorophyll are used to infer phytoplankton biomass changes and the relationship to sea surface temperature. This study shows that chlorophyll changes can be light-driven so the temperature–biomass relationship may not hold in the future.
ISSN:1758-678X
1758-6798
DOI:10.1038/nclimate2838