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Seasonal variability in carbon demand and flux by mesozooplankton communities at subarctic and subtropical sites in the western North Pacific Ocean

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Abstract

We investigated seasonal changes in carbon demand and flux by mesozooplankton communities at subtropical (S1) and subarctic sites (K2) in the western North Pacific Ocean to compare the impact of mesozooplankton communities on the carbon budget in surface and mesopelagic layers. Fecal pellet fluxes were one order higher at K2 than at S1, and seemed to be enhanced by copepod and euphausiid egestion under high chlorophyll a concentrations. The decrease in pellet volume and the lack of any substantial change in shape composition during sink suggest a decline in fecal pellet flux due to coprorhexy and coprophagy. While respiratory and excretory carbon by diel migrants at depth (i.e., active carbon flux) was similar between the two sites, the actively transported carbon exceeded sinking fecal pellets at S1. Mesozooplankton carbon demand in surface and mesopelagic layers was higher at K2 than S1, and an excess of demand to primary production and sinking POC flux was found during some seasons at K2. We propose that this demand was met by supplementary carbon sources such as feeding on protozoans and fecal pellets at the surface and carnivory of migrants at mesopelagic depths.

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Acknowledgments

We are grateful to Drs. C. B. Miller and S. S. Villamor for English editing and the two anonymous reviewers and a handling editor for valuable comments and suggestions. We thank the captain and crew of the R/V Mirai, and the staff of Marine Works Japan Ltd for their help with sampling in the field and with sample analyses. This study was supported in part by grants from the Japan Society for the Promotion of Science (21710012, 23310020, 25340011) and the Ministry of Education, Culture, Sports, Science and Technology of Japan (SKED: The Study of Kuroshio Ecosystem Dynamics for Sustainable Fisheries).

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Authors and Affiliations

  1. Aquatic Sciences, Faculty of Fisheries, Kagoshima University, 4-50-20 Shimoarata, Kagoshima, 890-0056, Japan

    T. Kobari, K. Tanabe, H. Nagafuku & A. Niibo

  2. Aquatic Sciences, Graduate School of Fisheries, Kagoshima University, 4-50-20 Shimoarata, Kagoshima, 890-0056, Japan

    R. Nakamura & K. Unno

  3. Research and Development Center for Global Change (RCGC), Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, 237-0061, Japan

    M. Kitamura

  4. Public Relations Department, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, 237-0061, Japan

    H. Kawakami

  5. Department of Environmental Geochemical Cycle Research, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, 237-0061, Japan

    K. Matsumoto & M. C. Honda

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  1. T. Kobari
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Kobari, T., Nakamura, R., Unno, K. et al. Seasonal variability in carbon demand and flux by mesozooplankton communities at subarctic and subtropical sites in the western North Pacific Ocean. J Oceanogr 72, 403–418 (2016). https://doi.org/10.1007/s10872-015-0348-7

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