EFFECTS OF INCREASED TEMPERATURE AND CO 2 ON PHOTOSYNTHESIS, GROWTH, AND ELEMENTAL RATIOS IN MARINE SYNECHOCOCCUS AND PROCHLOROCOCCUS (CYANOBACTERIA) 1
Abstract
Little is known about the combined impacts of future CO 2 and temperature increases on the growth and physiology of marine picocyanobacteria. We incubated Synechococcus and Prochlorococcus under present‐day (380 ppm) or predicted year‐2100 CO 2 levels (750 ppm), and under normal versus elevated temperatures (+4°C) in semicontinuous cultures. Increased temperature stimulated the cell division rates of Synechococcus but not Prochlorococcus . Doubled CO 2 combined with elevated temperature increased maximum chl a –normalized photosynthetic rates of Synechococcus four times relative to controls. Temperature also altered other photosynthetic parameters (α, Φ max , E k , and ) in Synechococcus , but these changes were not observed for Prochlorococcus . Both increased CO 2 and temperature raised the phycobilin and chl a content of Synechococcus , while only elevated temperature increased divinyl chl a in Prochlorococcus . Cellular carbon (C) and nitrogen (N) quotas, but not phosphorus (P) quotas, increased with elevated CO 2 in Synechococcus, leading to ∼20% higher C:P and N:P ratios. In contrast, Prochlorococcus elemental composition remained unaffected by CO 2 , but cell volume and elemental quotas doubled with increasing temperature while maintaining constant stoichiometry. Synechococcus showed a much greater response to CO 2 and temperature increases for most parameters measured, compared with Prochlorococcus . Our results suggest that global change could influence the dominance of Synechococcus and Prochlorococcus ecotypes, with likely effects on oligotrophic food‐web structure. However, individual picocyanobacteria strains may respond quite differently to future CO 2 and temperature increases, and caution is needed when generalizing their responses to global change in the ocean.
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In the presence of elevated CO2 concentrations, some species of cyanobacteria and microalgae experience an increase in growth rate, photosynthetic activity, and nitrogen fixation.
“In the presence of elevated CO 2 concentrations, some species of cyanobacteria and microalgae experience an increase in growth rate, photosynthetic activity, and nitrogen fixation [120-125].”
From Strategizing carbon-neutral mines: A case for pilot projects (2014) · cites this paper as [125]
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- Authors
- Fu, F., Warner, M. E., Zhang, Y., Feng, Y., & Hutchins, D. A.
- Affiliations
- University of Southern California (US)
- University of Delaware (US)
- Corresponding author
- Hutchins, David A.
- Venue
- Journal of Phycology
- Publisher
- Wiley
- Published
- 2007-05-16
- Volume
- 43
- Issue
- 3
- Pages
- 485-496
- ISSN
- 0022-3646 (ISSN-L)
- 1529-8817
- OpenAlex
- W1978886837
- Cited by
- 418
- References
- 58
- Citations by year
- 2026: 12 · 2025: 14 · 2024: 15 · 2023: 12 · 2022: 22 · 2021: 22 · 2020: 17 · 2019: 25 · 2018: 25 · 2017: 34 · 2016: 31 · 2015: 28 · 2014: 33 · 2013: 24 · 2012: 31
- FWCI
- 12.05
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Phycology (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
- Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
- Keywords
- Synechococcus, Prochlorococcus, picocyanobacteria, elevated CO2, high temperature, photosynthesis, cell division rate, elemental stoichiometry, C:N:P ratios, phycobilins, global change, ocean warming, ocean acidification
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