Abstract
Nutrient concentrations in seawater, and C, N, P, Si and chlorophyll-a content in different-sized particulates were measured in Jiaozhou Bay , and C, N, P, Si composition in different-sized fractions of phytoplankton and their ecological responses to nutrient structure of the seawater were studied. Microphytoplankton and nanophytoplankton were dominant in Jiaozhou Bay . High C (16.50–20.97 μmol L−1), N (2.46–2.99 μmol L−1), and low P (0.06–0.12 μmol L−1), Si (0.18–0.57 μmol L−1) content, and high N/P (24.7–64.6) and low Si /P (4.4–10.8) and Si /N (0.06–0.20) ratios were found in all sized groups of particulates. These values reflected the elemental compositions of different-sized fractions of phytoplankton as being an ecological response to the nutrients in the seawater. The ratios deviated significantly from the Redfield values. The nutrient composition of seawater and particulates and their relationship to chlorophyll-a showed that phytoplankton growth was possibly limited by Si . Si limitation appears favorable for controlling the ecological equilibrium of Jiaozhou Bay . Different-sized fractions of phytoplankton had different suitability to nutrient structures of the seawater. Among phytoplankton -sized groups, nanophytoplankton and microphytoplankton growths were more adaptable in eutrophic Jiaozhou Bay , and more competitive for assimilation of Si . This is consistent with their diatom -dominated composition , controlling the biomass and productivity of phytoplankton in Jiaozhou Bay .
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Shen, Z., Liu, Q., Wu, Y., Yao, Y. (2020). Ecological Responses of Phytoplankton to Nutrient Structure of Seawater in Jiaozhou Bay. In: Shen, Z. (eds) Studies of the Biogeochemistry of Typical Estuaries and Bays in China. Springer Earth System Sciences. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-58169-8_12
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