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Vertical shift in ciliate body-size spectrum and its environmental drivers in western Arctic pelagic ecosystems

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Abstract

As an inherent functional trait, body-size spectrum is widely used as an informative indicator to summarize community structures in taxon-free space. The vertical shift in the body-size spectrum of pelagic ciliates and its environmental drivers were explored at eight depth layers from the water surface to a depth of 100 m in western Arctic pelagic ecosystems. A total of 85 samples were collected at 23 sampling stations during the summer sea-ice reduction period from August 5 to August 24, 2016. Based on equivalent spherical diameter (ESD), six body-size ranks were identified, of which ranks S2 (15–25 μm), S3 (26–38 μm), S4 (39–60 μm), and S6 (79–91 μm) were the top four levels in frequency of occurrence and ranks S2 and S3 were the dominant levels in abundance. The body-size spectrum of the ciliates showed a clear vertical shift, with a significant succession among the dominant body-size units from the water surface to deeper layers in the water column. Multivariate analysis demonstrated a significant vertical variation in the body-size spectrum of the ciliates among the eight depths, which was significantly correlated with nutrients (phosphate and nitrite + nitrate) and chlorophyll a (Chl a), alone or in combination with dissolved oxygen. Four body-size diversity/distinctness indices were significantly correlated with the levels of phosphate, nitrite + nitrate, ammonium, and Chl a. Our results demonstrated that the body-size spectrum of pelagic ciliates can be shifted by environmental drivers (mainly nutrients and Chl a); thus, we suggest that it may be used to indicate water quality status on a vertical scale in the water column in deep seas.

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Acknowledgements

This work was supported by the K-AOOS Program (KOPRI; grant number PM17040) funded by the Ministry of Oceans and Fisheries, Korea.

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  1. Division of Polar Ocean Science, Korea Polar Research Institute, Incheon, 406-840, Republic of Korea

    Guangjian Xu, EunJin Yang, Youngju Lee & Sung-Ho Kang

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  1. Guangjian Xu
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Correspondence to EunJin Yang.

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Xu, G., Yang, E., Lee, Y. et al. Vertical shift in ciliate body-size spectrum and its environmental drivers in western Arctic pelagic ecosystems. Environ Sci Pollut Res 25, 19082–19091 (2018). https://doi.org/10.1007/s11356-018-2094-z

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