The Impact of Sewage Discharge on the Macroalgae Community in the Yellow Sea Coastal Area Around Qingdao,China |
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Authors: | Dongyan Liu Jie Bai Shuqun Song Jing Zhang Ping Sun Ying Li Gang Han |
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Institution: | (1) College of Marine Life Science, Ocean University of China, 5 Yushan Road, Qingdao, 266003, China;(2) School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW, 2522, Australia;(3) College of Environmental Science and Engineering, Ocean University of China, 5 Yushan Road, Qingdao, 266003, China;(4) State Key Lab of Estuarine and Coastal Research, East China Normal University, 3663 Zhongshan Road North, Shanghai, 200062, China;(5) Institute of Oceanology, The Chinese Academic of Science, Qingdao, 266071, China |
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Abstract: | The dynamics of macroalgal communities and the impact of sewage on their growth were studied in the tidal zone around Zhanqiao
Pier of the Qingdao coastal area, in the northwest of the Yellow Sea, China, from September 2001 to September 2003. The tidal
zone of the study area is divided into western and eastern sections by the Zhanqiao Pier. Inorganic nitrogen and phosphorus
in seawater showed higher concentrations on the eastern side of Zhanqiao Pier than on the western side, because a sewer drains
into the eastern side. The macroalgal communities on each side of the Pier showed an obvious difference due to the effect
of this sewage discharge. A total of 47 macroalgal species including 10 greens, 11 browns and 26 reds was identified in this
study. The species composition and biomass indicated higher values in the nutrient-rich area on the eastern side of Zhanqiao
Pier compared with the nutrient-poor area on the western side of Zhanqiao Pier. Some ephemeral and filamentous species dominated
seasonally on the eastern side of Zhanqiao Pier, in contrast to the western side where slow-growing species dominated throughout
the year. Nutrient gradients and temperature were considered the main factors affecting the distribution of macroalgae communities
in time and space. The results are consistent with the common observation that nutrient-poor areas are dominated by slow-growing
rather than ephemeral algal species. Moreover, the species diversity in the whole study area had declined when compared to
previous records. |
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Keywords: | Macroalgae Sewage Intertidal Zhanqiao pier bay Yellow sea China |
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