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General Session 3: Biological oceanography & global change |
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Elemental composition of diatoms: Implications for Redfield or non-Redfield uptake?
GS3-14-S
Zhengjie Hou* , State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China
Presenter Email: houzhengjie@stu.xmu.edu.cn
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| Abstract The Redfield ratio (106C:16N:P) links three major biogeochemical cycles through the activities of marine phytoplankton and largely shaping our understanding of marine biogeochemistry of nutrients. However, growing evidence points forward that phytoplankton elementary stoichiometry diverges from the canonical Redfield ratio. In order to figure out whether the elemental composition of diatoms consist with the Redfield ratio, we calculated the C:N:P:Si ratios of two diatoms Phaeodactylum tricornutum and Thalassiosira weissflogii under no nutrient limitation. Results show average C:N ratio of Phaeodactylum sp. and Thalassiosira sp. to be 6.0 and 6.8, which is close to the canonical C:N ratio of 6.6. However, average C:P ratio (51.9 and 43.8) and average N:P ratio (8.7 and 6.5) of two diatoms are both lower than Redfield ratio of C:P (106) and N:P (16) respectively, confirming the non-Redfield ratio of diatoms. With Si:C ratio and Si:N ratio of Phaeodactylum sp. being 0.01 and 0.05 and Thalassiosira sp. being 0.04 and 0.28, we can see that Thalassiosira sp. has lager percent of silicon component than Phaeodactylum sp., which also indicates the interspecific variability of two diatoms. |
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