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Long-Term Changes in Nutrient Structure and Its Influences on Phytoplankton Composition in Jiaozhou Bay

  • Zhiliang ShenEmail author
Chapter
Part of the Springer Earth System Sciences book series (SPRINGEREARTH)

Abstract

Due to the influence of human activities, nutrient concentrations, nutrient ratios and phytoplankton composition have notably changed in Jiaozhou Bay, China, since the 1960s. From the 1960s to the 1990s, nutrient concentrations have increased 1.4 times for PO4–P, 4.3 times for NO3–N, 4.1 times for ammonium (NH4–N) and 3.9 times for dissolved inorganic nitrogen (DIN). The molar ratio of DIN:PO4–P increased from 15.9 ± 6.3 to 37.8 ± 22.9. SiO3–Si concentration has remained at a very low level. The high ratio of DIN:PO4–P and low ratios of SiO3–Si:PO4–P (7.6 ± 8.9) and SiO3–Si:DIN (0.19 ± 0.15) showed the nutrient structure of Jiaozhou Bay has changed from more balanced to unbalanced during the last 40 years. The possibility that DIN and/or PO4–P as limiting factors of Jiaozhou Bay phytoplankton has been lessened or eliminated and that of SiO3–Si limiting has been increased. The changes in nutrient structure may have led to the decrease in large diatoms and a shift of phytoplankton species composition.

Keywords

Nutrient Molar ratio Nutrient structure Nutrient balance Limiting Phytoplankton Long-term changes Jiaozhou Bay 

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2020

Authors and Affiliations

  1. 1.Key Laboratory of Marine Ecology and Environmental SciencesInstitute of Oceanology, Chinese Academy of SciencesQingdaoChina

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