Cited by 198Marine and coastal plant biologyMarine and coastal ecosystemsOcean Acidification Effects and Responses

Photosynthesis of marine macroalgae and seagrasses in globally changing CO2 environments

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Beer, S, Koch, E·1996·Marine Ecology Progress Series

Abstract

Photosynthetic rates of many marine macroalgae are saturated by the present day inorganic carbon (Ci) composition of seawater, while those of seagrasses (or marine angiosperms) are CO1limited.In this study we attempted to simulate the Ci conditions of near-shore seawater during the time that seagrasses colonised the sea (in the Cretaceous), and compare the photosynthetic performance of representatives of the 2 plant groups under those versus present day conditions.The results show that the seagrasses have an affinity for Ci at least as high as the algae under the low pH and high C02/HC03' concentration ratios simulating near-shore areas of the Cretaceous seas, indicating that their photosynthetic capacity then matched that of macroalgae.However, in the high pH and high COz/HCO?-ratlos of today, their a f f ~n ~t y for Ci is lower than that of the macroalgae, and it is suggested that this deficiency renders them a lower ability for Ci utilisation.This situat~on may possibly be reversed again as global CO2 levels of the atmosphere and, consequently, of near-shore marine habitats increase in the future.

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  • Differential sensitivity to photosynthetic carbon between seagrass species could be due to species variation in DIC utilization mechanisms and extent of carbon-limitation.

    “Differential sensitivity to photosynthetic carbon between seagrass species could be due to species variation in DIC utilization mechanisms [38, 64] and extent of carbon-limitation [9, 64].”

    From Light Levels Affect Carbon Utilisation in Tropical Seagrass under Ocean Acidification (2016) · cites this paper as [9]

    The Results (page unavailable) report that both tested seagrass species were carbon-limited in ambient seawater, and the Discussion links seagrass carbon limitation to bicarbonate-utilization mechanisms. The paper makes these comparisons chiefly between seagrasses and macroalgae; it does not establish that differences in mechanisms or degree of limitation explain differential sensitivity between seagrass species. (LLM, conf=0.86)

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  • Uncalcified algal taxa have been considered unresponsive to CO2 enrichment due to the presence of efficient carbon concentrating mechanisms (CCMs) and carbon saturated photosynthetic rates.

    “Uncalci fi ed algal taxa have been considered unresponsive to CO2 enrichment due to the presence of ef fi cient carbon concentrating mechanisms (CCMs) and carbon saturated photosynthetic rates (Beer & Koch 1996).”
  • Seagrass productivity may be limited by present day seawater dissolved inorganic carbon composition.

    “Seagrass productivity may also be limited by the present day seawater composition of dissolved inorganic carbon (DIC) [9, 10].”

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Authors
Beer, S., & Koch, E.
Affiliations
University of Connecticut (US)
Venue
Marine Ecology Progress Series
Published
1996
Volume
141
Pages
199-204
ISSN
  • 0171-8630 (ISSN-L)
  • 1616-1599
OpenAlex
W2068802741
Cited by
198
References
4
Citations by year
2026: 4 · 2025: 2 · 2024: 5 · 2023: 7 · 2022: 10 · 2021: 7 · 2020: 11 · 2019: 5 · 2018: 12 · 2017: 15 · 2016: 9 · 2015: 10 · 2014: 8 · 2013: 10 · 2012: 9
FWCI
5.40
Type
journal article
Language
en
Open access
Locations
Marine Ecology Progress Series (publishedVersion)
Funders
University of Connecticut
Topics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal plant biology
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Ocean Acidification Effects and Responses
Keywords
photosynthesis, seaweed, seagrass, inorganic carbon, seawater pH, ocean acidification, photosynthetic capacity, marine angiosperms

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