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The different responses of growth and photosynthesis to NH 4 + enrichments between Gracilariopsis lemaneiformis and its epiphytic alga Ulva lactuca grown at elevated atmospheric CO 2 .
Marine Pollution Bulletin 2019 July
We investigated how elevated CO2 affects the responses of Gracilariopsis lemaneiformis and Ulva lactuca to NH4 + enrichments. All algae were incubated under four nutritional conditions (zero addition, 100, 500, and 2500 μM NH4 + ), and two CO2 levels (390 ppm and 1000 ppm). The growth, photosynthesis, and soluble protein contents of both species increased under the eutrophication condition (100 μM NH4 + ). However, the growth and carotenoid contents of the two species declined when NH4 + concentration increased. Under the super eutrophication condition (2500 μM NH4 + ), all indexes measured in G. lemaneiformis were suppressed, while the growth and photosynthesis in U. lactuca changed indistinctively, both compared with the control. Moreover, under the super eutrophication condition, elevated CO2 reduced the suppression in the growth of G. lemaneiformis, but decreased the growth of U. lactuca. Nonetheless, G. lemaneiformis displayed much lower growth rates than U. lactuca under the super eutrophication and elevated CO2 condition.
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