2005—2006年大亚湾大鹏澳养殖区甲藻孢囊通量的沉积捕捉器研究

doi:10.11978/j.issn.1009-5470.2011.01.113

Abstract

Abstract:

A sediment trap study was conducted in shellfish culture area and caged fish area in Dapeng-Ao area of the Daya Bay in the South China Sea from March 2005 to April 2006. Cyst flux, water temperature, salinity and nutrient concentrations were investigated during the survey in order to understand the characteristics of cyst formation and the effects of environmental factors on encystment in subtropic sea areas. Twenty-seven cyst types were identified during one-year trap study. Cysts of autotrophic dinoflagellates dominated the cyst assemblages, and Scrippsiella trochoidea was the preponderant cyst type. The cyst composition revealed that the pollution of Dapeng-Ao was mainly caused by aquacultural and domestic pollution. Cyst fluxes showed no seasonal patterns, with the annual average of 1.07×105cysts•m?2 d?1. Both high temperature and low temperature stimulated the cyst formation. Furthermore, low nitrogen level accelerated encystment. A winter peak of cyst flux of Alexandrium was first observed in this sea region during our study, with the maximum of 4.26×105 cysts•(m2•d)?1. The results suggest that cooling water discharged by the Daya Bay Nuclear Power Station and consequential increasing of winter water temperature, might have some impacts on the nearby environment.

Key words: Dinoflagellate, cyst flux, sediment trap, Daya Bay, Alexandrium

WANG Zhao-hui,CAO Yu,ZHANG Yu-juan. The fluxes of dinoflagellate cyst from sediment traps deployed in Dapeng-Ao area of Daya Bay from 2005 to 2006[J].Journal of Tropical Oceanography, 2011, 30(1): 113-118.

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The fluxes of dinoflagellate cyst from sediment traps deployed in Dapeng-Ao area of Daya Bay from 2005 to 2006

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