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The Korean Society of Phycology (한국조류학회(藻類))
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Photosynthetic carbon fixation by tropical coral reef phytoplankton assemblages: a UVR perspective

  • Li, Gang (State Key Laboratory of Marine Environmental Science, Xiamen University) ;
  • Che, Zhiwei (Sanya Marine Environment Monitoring Station, SOA) ;
  • Gao, Kunshan (State Key Laboratory of Marine Environmental Science, Xiamen University)
  • Received : 2013.05.01
  • Accepted : 2013.08.05
  • Published : 2013.09.15
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Abstract

Photosynthetic carbon fixation regulates air-sea $CO_2$ fluxes in the waters of coral reefs. However, little has been documented on the effects of solar UV radiation (UVR, 280-400 nm) upon photosynthetic behaviors of phytoplankton dwelling in these ecosystems. In order to evaluate the aforesaid, surface dwelling tropical coral reef phytoplankton assemblages collected from the South China Sea were exposed to solar radiation (i.e., photosynthetically active radiation [PAR] + UV radiation A [UVA] + UV radiation B [UVB], 280-700 nm; PAR + UVA, 320-700 nm; and PAR, 400-700 nm) under static or simulated-mixing conditions. Under the static condition, UVA and UVB significantly reduced the carbon fixation with the maximum of 22.4 and 15.3%, respectively; while lower UVR-related photosynthetic inhibition was observed in case of phytoplankton samples being subjected to mixing. At a moderate level of mixing (i.e., circulation time 80 min), the UVA and UVB caused inhibition were lowered by 52.1 and 79.6%, respectively. Based on this it could be stated that vertical mixing induced by winds and/or tides in the natural environments could reduce the inhibitory effect of solar UVR on phytoplankton productivity in the coral reefs water.

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References

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