La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Cell Size-Dependent Effects of Solar UV Radiation on Primary Production in Coastal Waters of the South China Sea
Auteurs :	Gang Li, Auteur ; Kunshan Gao, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (36(4) JUL 2013)
Article en page(s) :	728-736
Résumé :	In order to examine the effects of solar ultraviolet radiation (UVR, 280-400 nm) on photosynthesis of differently cell-sized phytoplankton, natural phytoplankton assemblages from the coastal waters of the South China Sea were separated into three groups (> 20, 5-20, and 20 mu m) efficiently utilized UV-A for photosynthetic carbon fixation, with assimilation number of up to 1.01 mu g C (mu g chl a)(-1) h(-1) under 21.4 W m(-2) UV-A alone (about half of noontime irradiance at the surface), about 40 % higher than nanoplankton (5-20 mu m). UV-B (280-315 nm) of 0.95 W m(-2) reduced the carbon fixation by approximately 20 and 57 % in microplankton and nanoplankton assemblages, respectively. In contrast, smaller picoplankton (

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