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- W2021199068 abstract "Abstract The effect of ultraviolet radiation on diel changes and depth profiles of phytoplankton photosynthesis was studied in four temperate freshwater lakes. Photosynthetic oxygen production was determined by incubating lake water in light and dark bottles under various weather conditions. Half the light bottles were wrapped with sheets of vinyl chloride film to exclude light with wavelengths shorter than 400 nm. The inhibition of photosynthesis due to UV‐A (320–400 nm) was observed during most of the daytime and was very strong around noon on both sunny and cloudy days. On sunny days, when the surface waters of the highly eutrophic Lake Suwa and Senzoku Pond were dominated by dense Microcystis populations, cumulative daily production at the surface, estimated from the incubation of bottles from which UV‐A was excluded by the vinyl film, were about double the rates obtained from glass bottles in which UV‐A was present. The UV‐A inhibition was detected from the surface to ca 20 cm depth in hypereutrophic lakes and at depths greater than 50 cm in mesotrophic lakes. Analysis of the photosynthesis‐irradiance (P‐I) relationship obtained in the present study shows β, a parameter that describes photo‐inhibition, is higher in the presence of UV‐A than in its absence. This indicates that UV‐A is the major cause of photo‐inhibition of phytoplankton photosynthesis." @default.
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- W2021199068 date "1993-08-01" @default.
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- W2021199068 title "The effect of long wave ultraviolet radiation (UV‐A) on the photosynthetic activity of natural population of freshwater phytoplankton" @default.
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- W2021199068 doi "https://doi.org/10.1007/bf02348535" @default.
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