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• W2058251128 abstract "The effects of algal density, light adaptation, and interaction of light and nitrogen on nutrient uptake, growth, and biochemical composition of Ulva fasciata Delile were investigated in outdoor continuous cultures. With increasing plant densities, specific growth rates decreased exponentially from 0.36 to 0.02 doublings · day−1. In contrast, yields increased to a maximum of 4.7 g C · m−2 · day−1 at the intermediate density and then decreased. Plants grown under low (62 ly · day−1) and high (324 ly · day−1) light conditions were subsequently exposed to medium light (282 ly · day−1). Initially, plants from low light conditions had twice the chlorophyll a content and yield than plants from high light conditions. Within 1 wk, all plants showed no difference with regard to chlorophyll a and yield. Growth of U. fasciata did not saturate up to the highest light intensities used (255 ly · day−1). Nitrogen (NO3−) additions at low light did not affect growth but at high light there was increasing growth with increasing nitrogen. This interaction between light and nitrogen was apparent when growth was measured as specific growth rate (doublings · day−1), activity coefficient (mg C · g C−1 · day −1) and yield (g C · m−2 · day−1). These growth measures all significantly correlated with %C and ash content but not with %N, the C:N or C: Chl a ratios. Photosynthetic rate (g C · g Chl a−1 · day−1) showed no interaction between light and nitrogen because it corrected for increases in chlorophyll a content caused by nitrogen additions. This growth measure correlated with %N and the C: N and C: Chl a ratios as well as %C and ash content. Photosynthetic efficiency of U. fasciata was positively correlated with %N and chlorophyll a content and was affected by light intensity only at low nitrogen levels. Uptake of NO3− by U. fasciata depended mostly on the daily loadings of this nutrient, but was also inversely proportional to light intensity." @default.
• W2058251128 created "2016-06-24" @default.
• W2058251128 creator A5016356704 @default.
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• W2058251128 date "1981-07-01" @default.
• W2058251128 modified "2023-10-02" @default.
• W2058251128 title "Experimental outdoor studies with Ulva fasciata Delile. I. Interaction of light and nitrogen on nutrient uptake, growth, and biochemical composition" @default.
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• W2058251128 doi "https://doi.org/10.1016/0022-0981(81)90015-0" @default.
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