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IMPACT OF UV‐B RADIATION UPON ESTUARINE MICROCOSMS
Author(s) -
Worrest Robert C.,
Thomson Bruce E.,
Dyke Henry Van
Publication year - 1981
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1981.tb05504.x
Subject(s) - microcosm , phytoplankton , environmental chemistry , biomass (ecology) , plankton , estuary , chlorophyll a , dry weight , ecosystem , chemistry , carbon fibers , environmental science , radiation , composition (language) , ecology , botany , biology , nutrient , biochemistry , materials science , physics , linguistics , philosophy , quantum mechanics , composite number , composite material , organic chemistry
— Twelve flow‐through estuarine microcosms were exposed daily to four different levels of UV‐B radiation (290–320. nm)(1.57 ± 10 2 , 6.43 ± 10 3 , 6.86 ± 10 3 and 7.61 ± 10 3 J·m ‐2 d −1 ) in addition to a natural level of visible solar radiation (380‐800. nm). The parameters studied over a four week period were phytoplankton community composition, plankton biomass (ash‐free dry weight), chlorophyll a concentration and primary productivity (radiocarbon uptake). With increased exposure to UV‐B radiation there was an obvious alteration of the community composition. Daily exposure to enhanced levels of UV‐B radiation also depressed the biomass, the chlorophyll a concentration and the radiocarbon uptake of samples from the ecosystems.