I studied the ecophysiological responses of macroalgae under ocean acidification and cultural eutrophication conditions that have been ever increasing problems in the coastal water. I examined the several characteristics such as extent of pH change, photosynthetic oxygen evolution rates, rates of NH...
I studied the ecophysiological responses of macroalgae under ocean acidification and cultural eutrophication conditions that have been ever increasing problems in the coastal water. I examined the several characteristics such as extent of pH change, photosynthetic oxygen evolution rates, rates of NH4+ uptake, relative growth rates, photosynthetic efficiencies, tissue carbon contents, tissue nitrogen contents, and C:N ratios within the tissues in three seaweed species. Ulva australis (Chlorophyta) was a dominant species in natural community, and Gracilariopsis lemaneiformis (Rhodophyta) and Saccharina japonica (Phaeophyta) were two commercially cultivated species.
The elevated CO2 and NH4+ treatments enhanced the physiological responses of Ulva australis. The initial pH levels of culture medium positively affected the extent of pH changes. NH4+ treatment exclusively influenced the rates of photosynthetic oxygen evolution and photosynthetic efficiencies with positive impacts. I found positive synergistic interactions between initial pH and NH4+ concentrations considering the rates of NH4+ uptake and relative growth. However, none of the treatments affected the C:N ratio in tissues. Based on these results, I suggest that U. australis could provide a potential mitigation solution of acidification and eutrophication states because of its capacity that extracts nutrients and dissolved inorganic carbons.
The physiological responses of cultivar species Gracilariopsis lemaneiformis and Saccharina japonica were positively related with elevated CO2 and NH4+ conditions. In the case of G. lemaneiformis, the extents of pH increase were dependent on initial pH level and NH4+ concentrations, but the NH4+ treatment only affected its photosynthetic efficiencies. The interaction between pH and NH4+ levels synergistically affected the rates of relative growth, photosynthetic oxygen evolution, and NH4+ uptake. For S. japonica, pH increase in the culture media and inhibitions of photosynthesis by acetazolamide influenced by the initial pH level only. Furthermore, only the NH4+ concentration affected the rates of relative growth for S. japonica, as well as concentrations of tissue C, tissue N, and the C:N ratio. Although at each pH or NH4+ level altered the rates of photosynthetic oxygen evolution, there were no significant interaction between those two factors. However, rates of NH4+ uptake were influenced positively by the combined effect of both pH and NH4+. In contrast, none of the culture treatments did not influence on the photosynthetic efficiencies of S. japonica. From these data, I predict that future oceanic conditions could promote biomass production of G. lemaneiformis and S. japonica. Conclusively, seaweed aquaculture beds (SABs) that include G. lemaneiformis, and S. japonica serve as a mitigation tool for combating problems associated with ocean acidification, and eutrophication.
I studied the ecophysiological responses of macroalgae under ocean acidification and cultural eutrophication conditions that have been ever increasing problems in the coastal water. I examined the several characteristics such as extent of pH change, photosynthetic oxygen evolution rates, rates of NH4+ uptake, relative growth rates, photosynthetic efficiencies, tissue carbon contents, tissue nitrogen contents, and C:N ratios within the tissues in three seaweed species. Ulva australis (Chlorophyta) was a dominant species in natural community, and Gracilariopsis lemaneiformis (Rhodophyta) and Saccharina japonica (Phaeophyta) were two commercially cultivated species.
The elevated CO2 and NH4+ treatments enhanced the physiological responses of Ulva australis. The initial pH levels of culture medium positively affected the extent of pH changes. NH4+ treatment exclusively influenced the rates of photosynthetic oxygen evolution and photosynthetic efficiencies with positive impacts. I found positive synergistic interactions between initial pH and NH4+ concentrations considering the rates of NH4+ uptake and relative growth. However, none of the treatments affected the C:N ratio in tissues. Based on these results, I suggest that U. australis could provide a potential mitigation solution of acidification and eutrophication states because of its capacity that extracts nutrients and dissolved inorganic carbons.
The physiological responses of cultivar species Gracilariopsis lemaneiformis and Saccharina japonica were positively related with elevated CO2 and NH4+ conditions. In the case of G. lemaneiformis, the extents of pH increase were dependent on initial pH level and NH4+ concentrations, but the NH4+ treatment only affected its photosynthetic efficiencies. The interaction between pH and NH4+ levels synergistically affected the rates of relative growth, photosynthetic oxygen evolution, and NH4+ uptake. For S. japonica, pH increase in the culture media and inhibitions of photosynthesis by acetazolamide influenced by the initial pH level only. Furthermore, only the NH4+ concentration affected the rates of relative growth for S. japonica, as well as concentrations of tissue C, tissue N, and the C:N ratio. Although at each pH or NH4+ level altered the rates of photosynthetic oxygen evolution, there were no significant interaction between those two factors. However, rates of NH4+ uptake were influenced positively by the combined effect of both pH and NH4+. In contrast, none of the culture treatments did not influence on the photosynthetic efficiencies of S. japonica. From these data, I predict that future oceanic conditions could promote biomass production of G. lemaneiformis and S. japonica. Conclusively, seaweed aquaculture beds (SABs) that include G. lemaneiformis, and S. japonica serve as a mitigation tool for combating problems associated with ocean acidification, and eutrophication.
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