Abstract
This study analyzes the community structure, the quantity changes of the algae and the effect of important environmental factors and estimates the total biomass of the attached green algae in the survey areas. The study uses data from surveys of the attached green algae on the Porphyra yezoensis aquaculture rafts and data regarding the environmental factors from October 2010 to April 2011 in the Subei Shoal. The attached green algae on the rafts included Ulva prolifera, Capsosiphon groenlandicus, U. linza, U. intestinalis, U. clathrata, and U. compressa. The biomass changes of the attached green algae exhibited an inverted parabola: the biomass was the highest (14 898 t) in April, and was the second highest (2 034 t) in November; it was lowest in February (only 729 t) and increased sharply from March to April. The species diversity differed significantly among the seasons. In September and October, when the P. yezoensis aquaculture rafts were initially set up, the attached green algae had a high biodiversity, while from December to the next February, a variety of green algae species coexisted on the rafts, although the biomass was low, and from March to April, as the biomass increased sharply, the species diversity dropped to the minimum. During this time, C. groenlandicus was apparently dominant with the maximum biomass proportion up to 80%, while the U. prolifera proportion increased exponentially to 20% to 40%. The water temperature had a direct regulating effect on the biomass and the species succession of the attached green algae. The estimation of the community dynamics and the biomass of the green algae provided the evidence needed to track the origin of the large-scale green tide in the southern Yellow Sea.
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Foundation item: The National Basic Research Program (973 Program) of China under contract No. 2010CB428703; the National Natural Science Foundation of China under contract No. 41306171; the National Research Foundation-Shandong Province United Fund under contract No. U1406403; the Qingdao Public Domain to Support Science and Technology Project under contract No. 13–4–1–68–hy; the Marine and Basic Research Funds of the First Institute of Oceanography, SOA under contract No. 2015G09; MOST International S&T Cooperation Program under contract No. 2010DFA24340.
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Li, Y., Xiao, J., Ding, L. et al. Community structure and controlled factor of attached green algae on the Porphyra yezoensis aquaculture rafts in the Subei Shoal, China. Acta Oceanol. Sin. 34, 93–99 (2015). https://doi.org/10.1007/s13131-015-0677-9
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DOI: https://doi.org/10.1007/s13131-015-0677-9