Red alga Palmaria palmata—growth rate and photosynthetic performance under elevated CO2 treatment

Sebök, Stefan; Herppich, Werner B.; Hanelt, Dieter

doi:10.1007/s10811-016-0939-8

Cited by 4 publications

(2 citation statements)

References 83 publications

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“…These data concur with those from field studies at naturally high CO 2 sites where flexibility to utilize CO 2 for photosynthesis increased a species abundance in the community adjacent to the CO 2 seeps 18 . Several experimental and culture studies have also shown an increase in photosynthesis and growth in temperate macroalgae in response to elevated p CO 2 43 , 44 . Others suggest that greater CO 2 availability only advantages macroalgae that solely depend on CO 2 diffusion and lack CCMs 7 , 30 , 45 , 46 .…”

Section: Discussionmentioning

confidence: 98%

The role of irradiance and C-use strategies in tropical macroalgae photosynthetic response to ocean acidification

Zweng

Koch

Bowes

2018

Sci Rep

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Fleshy macroalgae may increase photosynthesis with greater CO2 availability under ocean acidification (OA) and outcompete calcifying macroalgae important for tropical reef accretion. Macroalgae use energy-dependent carbon concentrating mechanisms (CCMs) to take up HCO3−, the dominant inorganic carbon for marine photosynthesis, but carbon-use strategies may depend on the pCO2, pH and irradiance. We examined photosynthesis in eight tropical macroalgae across a range of irradiances (0–1200 μmol photon m−2 s−1), pH levels (7.5–8.5) and CO2 concentrations (3–43 μmol kg−1). Species-specific CCM strategies were assessed using inhibitors and δ13C isotope signatures. Our results indicate that the log of irradiance is a predictor of the photosynthetic response to elevated pCO2 (R2 > 0.95). All species utilized HCO3−, exhibited diverse C-use pathways and demonstrated facultative HCO3− use. All fleshy species had positive photosynthetic responses to OA, in contrast to a split amongst calcifiers. We suggest that shifts in photosynthetically-driven tropical macroalgal changes due to OA will most likely occur in moderate to high-irradiance environments when CCMs are ineffective at meeting the C-demands of photosynthesis. Further, facultative use of HCO3− allows greater access to CO2 for photosynthesis under OA conditions, particularly amongst fleshy macroalgae, which could contribute to enhance fleshy species dominance over calcifiers.

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Section: Discussionmentioning

confidence: 98%

The role of irradiance and C-use strategies in tropical macroalgae photosynthetic response to ocean acidification

Zweng

Koch

Bowes

2018

Sci Rep

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“…Our results show a lack of relationship between Fe concentration in the tissue of macroalgae and the associated ETRmax, which could indicate a generalized iron limitation for the growth of macroalgae in the main body of the Rea Sea. Nonetheless, ETRmax provides a measure of the capacity of the photosystems to utilize the absorbed light energy (Marshall et al, 2000) but this does not necessarily translate into plant growth (e.g., Seboek et al, 2017), and further experimental investigation manipulating Fe inputs while assessing gross primary production is necessary.…”

Section: Discussionmentioning

confidence: 99%

Iron Deficiency in Seagrasses and Macroalgae in the Red Sea Is Unrelated to Latitude and Physiological Performance

et al. 2018

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Iron can limit primary production in shallow marine systems, especially in tropical waters characterized by carbonated sediments, where iron is largely trapped in a non-available form. The Red Sea, an oligotrophic ecosystem characterized by a strong N-S latitudinal nutrient gradient, is a suitable setting to explore patterns in situ of iron limitation in macrophytes and their physiological performance under different iron regimes. We assessed the interactions between environmental gradients and physiological parameters of poorly-studied Red Sea macrophytes. Iron concentration, chlorophyll a concentration, blade thickness, and productivity of 17 species of macrophytes, including seven species of seagrasses and 10 species of macroalgae, were measured at 21 locations, spanning 10 latitude degrees, along the Saudi Arabian coast. Almost 90% of macrophyte species had iron concentrations below the levels indicative of iron sufficiency and more than 40% had critically low iron concentrations, suggesting that iron is a limiting factor of primary production throughout the Red Sea. We did not identify relationships between tissue iron concentration, chlorophyll a concentration and physiological performance of the 17 species of seagrass and macroalgae. There was also no latitudinal pattern in any of the parameters studied, indicating that the South to North oligotrophication of the Red Sea is not reflected in iron concentration, chlorophyll a concentration or productivity of Red Sea macrophytes.

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Effect of elevated carbon dioxide and nitric oxide on the physiological responses of two green algae, Asterarcys quadricellulare and Chlorella sorokiniana

et al. 2019

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Red alga Palmaria palmata—growth rate and photosynthetic performance under elevated CO2 treatment

Cited by 4 publications

References 83 publications

The role of irradiance and C-use strategies in tropical macroalgae photosynthetic response to ocean acidification

The role of irradiance and C-use strategies in tropical macroalgae photosynthetic response to ocean acidification

Iron Deficiency in Seagrasses and Macroalgae in the Red Sea Is Unrelated to Latitude and Physiological Performance

Effect of elevated carbon dioxide and nitric oxide on the physiological responses of two green algae, Asterarcys quadricellulare and Chlorella sorokiniana

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