Study On The Spatial And Temporal Distribution Of Phytoplankton Pigments In Typical Eutrophic Sea Areas Of Hainan Island

In this research, the composition and distribution characteristic of phytoplanktonpigments in5typical eutrophic bays of Hainan Island(Haiko Bay, Yangpu-xinyingBay, Chengmai Bay, Lingshui-xincun Bay, Dadong Bay) were investigated, also thephytoplankton pigments in Haiko Bay and Lingshui-xincun Bay were investigatedfrom December2010to May2011.The purposes of this study were to offer somebasic datas for further exactly evaluating the eutrophication of Hainan Island based onphytoplankton pigments indicators.18kinds of phytoplankton pigments were identified in this investigation ofHainan Island. The major pigments were chlorophyll a, chlorophyll b, chlorophyll c2,chlorophyll c3, DV chlorophyll a, peridinin, fucoxanthin,19-butanoyloxyfucoxanthin,19-hexanoyloxyfucoxanthin, alloxanthin, β-carotene, diadinoxanthin, fucoxanthin,diatoxanthin, fucoxanthin, lutein, neoxanthin, peridinin, prasinoxanthin,prasinoxanthin, zeaxnathin. Chlorophyll a and fucoxanthin were the most abundantof all pigments.In December2010, the composition and distribution characteristic ofphytoplankton pigments in5typical eutrophic bays of Hainan Island showed, the highconcentration of chlorophyll a was located in Yangpu-xinying Bay，the averageconcentration was0.564μg/L, the concentration range was0.219-1.350μg/L. Itshowed that water in this area was influenced by land-based pollution from humanactivities and water pollution from seafood breeding, to a certain extent, alsoshowed physiological status,and had high phytoplankton biomass. The highconcentration of fucoxanthin was located in Lingshui-xincun Bay，the averageconcentration was0.962μg/L, the concentration range was0.275-1.555μg/L. The highconcentration of chlorophyll c2were located in Lingshui-xincun Bay and DadongBay，the average concentration were0.316and0.179μg/L, the concentration rangewere0.087-0.563μg/L and0.064-0.478μg/L. The high concentration of chlorophyll c3were located in Lingshui-xincun Bay and Dadong Bay，the average concentrationwere0.242and0.178μg/L, the concentration range were0.088-0.405μg/L and 0.106-0.285μg/L. The high concentration of diadinoxanthin was located inLingshui-xincun Bay，the average concentration was0.071μg/L, the concentrationrange was0.026-0.108μg/L. The high concentration of zeaxanthin was located inDadong Bay, the average concentration was0.069μg/L, the concentration range was0.026-0.108μg/L. The high concentration of alloxanthin was located inYangpu-xinying Bay, the average concentration was0.059μg/L, the concentrationrange was0.036-0.114μg/L. The high concentration of19’-hexfucoxanthin waslocated in Dadong Bay, the average concentration was0.065μg/L, the concentrationrange was0.045-0.100μg/L. Prasinoxanthin, neoxanthin, peridinin, violaxanthin,19’-butfucoxanthin were low content in the whole investigation areas, the averageconcentration of the most high concentration were0.043,0.026,0.026,0.016,0.011μg/L。From December2010to May2011, the main pigments were detected with highcontents in Haikou Bay in March and April2011. Thus, the environmentalcharacteristics is suitable for the growth of phytoplankton at this time of year,probably with the increase of phytoplankton biomass and species. Different pigmentsreached the highest value in different months. In March, the main pigments with highcontents were19’-butfucoxanthin, alloxanthin, chlorophyll c2, diadinoxanthin,fucoxanthin. In April, the main pigments with high contents were chlorophyll a,neoxanthin, peridinin, violaxanthin. In May, the main pigments with high contentswas zeaxanthin. The implication was that the dominant species of phytoplankton maychange. The main pigments were detected with high contents in Haikou Bay inDecember2010and February2011.