Study on the photosynthetic performances of Enteromorpha prolifera collected from the surface and bottom of the sea of Qingdao sea area |
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Authors: | APeng Lin Chao Wang HongJin Qiao GuangHua Pan GuangCe Wang LiYun Song ZhiYuan Wang Song Sun BaiCheng Zhou |
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Institution: | (1) Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China;(2) Graduate School, Chinese Academy of Sciences, Beijing, 100039, China;(3) College of Marine Science and Engineering, Tianjin University of Science & Technology, Tianjin, 300457, China |
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Abstract: | In this work, the photosynthetic performances of Enteromorpha prolifera thalli collected from the surface and bottom of the sea of Qingdao sea area were studied with chlorophyll fluorescence and
oxygraph technology. The samples with the highest photosynthetic activity among their kinds, the floating thalli from the
sea surface of the south of the Qingdao Olympic Sailing Center and the sedimentary thalli from the mud surface of the bottom
Tuandao bay, were chosen as representatives of surface thalli and bottom thalli, respectively. The results showed that the
maximal PSII quantum yield of the floating thalli was significantly lower than the normal level although their photosynthetic
activities were relatively high; the photosynthetic potential of the thalli form the mud surface was extremely low. Thus,
it is indicated that the floating thalli are seriously stressed by their environment and the thalli from the mud surface are
already dead or are dying. On the other hand, the results of the laboratory cultivation showed that the sedimentary thalli
cannot regain normal photosynthetic activity even under normal illumination conditions. Thus, the thalli from the mud surface
cannot become reproductive source of the alga even if they can reach sea surface again. Therefore, a preliminary conclusion
can be reached that, up to mid-July 2008, the environmental conditions of the Qingdao sea area are not suitable for the growth
of the alga E. prolifera and for this reason the biomass of E. prolifera, in the area, could be declining.
Supported by National Natural Science Foundation of China (Grant No. 30830015), Key Projects in the National Science & Technology
Pillar Program in the Eleventh Five-year Plan Period (Grant No. 2006BAD09A04) and National High Technology Research and Development
Program of China (Grant Nos. 2006AA10A402, 2007AA09Z406, 2006AA05Z112, 2006AA10A413) |
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Keywords: | green tide Enteromorpha prolifera photosynthesis chlorophyll fluorescence oxygraph |
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