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Quantification of multiple environmental controls on lipid biomarkers in common marine diatoms and dinoflagellates

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Abstract

Ocean-related global changes have altered phytoplankton community structure, especially the diatom-dinoflagellate competition, which further influences ecosystem structure and functions. The pivotal ecological roles of diatoms and dinoflagellates are strongly related with their biochemical composition, but quantitative comparisons of biochemical changes between diatoms and dinoflagellates under variable environments are still limited. We investigated responses of lipid biomarkers (sterols and fatty acids (FAs)) to different temperatures (12, 18 and 24 °C), nitrogen and phosphorus concentrations and their molar ratios (N:P ratios) of 10:1, 24:1 and 63:1 in marine diatom Phaeodactylum tricornutum and dinoflagellate Prorocentrum minimum. Over these wide ranges of temperature and nutrient conditions, sterol and FA profiles were relatively stable in the two species. For carbon-normalized contents of major lipid biomarkers, warming caused non-significant changes in the diatoms but an increase (up to 153%) in the dinoflagellates. Eutrophication caused an overall decrease (up to 53%) in major lipid biomarker contents in the diatoms but an overall increase (up to 77%) in the dinoflagellates. In contrast, imbalanced N:P ratios caused an overall increase (up to 64%) in major lipid biomarker contents in the diatoms but an overall decrease (up to 53%) in the dinoflagellates. Taken together, our results showed that the contents of major sterols and polyunsaturated FAs would change non-significantly in the diatom P. tricornutum, while those in the dinoflagellate P. minimum would increase (ca. 9–48%) under future ocean warming, eutrophication and imbalanced N:P ratios. This study expands our knowledge on lipid-based indicators of phytoplankton under changing environments, which by systematically linking with several other aspects of food quality will help to understand ecological consequences of diatom-dinoflagellate community changes.

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Data availability

The datasets generated during and/or analysed during the current study are available on line at https://doi.org/10.5281/zenodo.8293788.

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Acknowledgements

We would like to thank Hailong Zhang, Gue’e Jin, Yu Zhan and Xiaoke Xin for technical support. We thank Yaoyao Wang, Peng Peng, Jiawei Gao and Xiaohan Bao for their assistance in the experiments, and Peng Jin for helpful discussions. We sincerely appreciate valuable comments from the two reviewers. This study was financially supported by Laoshan Laboratory (Grant Number LSKJ202204005) and the National Natural Science Foundation of China (Grant Number 41876118). This is MCTL (Key Laboratory of Marine Chemistry Theory and Technology) contribution #299.

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RB (Rong Bi) and MZ (Meixun Zhao) contributed to the plan of experiments. Experiment conduction and sample analysis were performed by ZC (Zhong Cao), with assistance of CZ (Chuanli Zhang), JC (Jiaxuan Cui), LL (Li Li) and YD (Yang Ding). Data analysis were performed by ZC. The first draft of the manuscript was written by ZC and RB, and MZ commented on previous versions of the manuscript. All authors have read and approved the final manuscript.

Corresponding authors

Correspondence to Rong Bi or Meixun Zhao.

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The authors have no relevant financial or non-financial interests to disclose. Rong Bi is an Associate Editor of Marine Biology.

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This article does not contain work that required ethical approval as no animals were approached.

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Responsible Editor: N. Aberle-Malzahn.

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Cao, Z., Bi, R., Zhang, C. et al. Quantification of multiple environmental controls on lipid biomarkers in common marine diatoms and dinoflagellates. Mar Biol 170, 136 (2023). https://doi.org/10.1007/s00227-023-04284-3

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  • DOI: https://doi.org/10.1007/s00227-023-04284-3

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