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- W2029163217 abstract "The marketability and physiological characteristics of Porphyra (nori) make it a good candidate for integrated aquaculture. Four species were grown in separate three-week greenhouse trials via tumble culture in small tanks (38L). Porphyra umbilicalis, P. linearis, P. leucosticta and P. amplissima were grown at 15, 8, 15 and 12 C, respectively. Plant growth, ammonium uptake, and pigment content were evaluated at three light levels (4%, 13%, and 58% of ambient sunlight), and two ammonium concentrations (25 and 250 ?M). The growth of Porphyra umbilicalis was higher at 250 ?M than at 25 ?M ammonium (P?0.002), while growth of the other three species were not affected by nitrogen concentration (P>0.05). With the exception of P. leucosticta, plant growth was greatest in high light (58% of ambient). Overall, average growth rates ranged from 31.8 (±2.8)%·day-1 for P. amplissima to 8.8 (±1.2)%·day-1 for P. leucosticta. Ammonium uptake rates were consistently higher in 250 than 25 ?M ammonium (P?0.05), except for P. amplissima (P>0.05). Uptake by P. umbilicalis was greatest at high light (P<0.005), but light did not affect uptake rates in the other three species (P>0.05). The phycoerythrin content of P. umbilicalis and P. leucosticta was greater at 250 ?M than 25 ?M ammonium, while it was not affected by nitrogen level in P. linearis and P. amplissima. The phycoerythrin content of all species decreased from low to high light (P<0.05); however, light affected the net phycoerythrin production only in P. leucosticta." @default.
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- W2029163217 date "2003-06-01" @default.
- W2029163217 modified "2023-09-26" @default.
- W2029163217 title "31 Effects of light and ammonium on growth, ammonium uptake and pigmentation of four porphyra (bangiales, rhodophyta) species native to the northwestern atlantic" @default.
- W2029163217 doi "https://doi.org/10.1111/j.0022-3646.2003.03906001_31.x" @default.
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