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Temporal variability in physicochemical properties, phytoplankton standing crop and primary production for 7 years (2002–2008) in the neritic area of Sagami Bay, Japan

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Abstract

Seasonal and interannual variations in physicochemical properties (i.e., temperature, salinity, dissolved oxygen and dissolved inorganic nutrients), chlorophyll a (Chl-a), particulate carbon and nitrogen (PC and PN, respectively), and primary production were investigated in the neritic area of Sagami Bay, Kanagawa, Japan, from January 2002 to December 2008. These abiotic/biotic variables, except for NH4 +–N, repeated similar seasonal variations for all 7 years. On the basis of the analysis of data obtained on 167 sampling dates, depth-integrated primary production in this water can be easily estimated from Chl-a at the surface using the regression equations obtained in the present study. Intermittently high values of dissolved inorganic nutrients, Chl-a, PC, PN and primary productivity at the surface during the summer stratified period were induced by high freshwater discharge from the rivers after rainfalls and by the expansion of nutrient-rich Tokyo Bay Water. Temperature, salinity and dissolved inorganic nutrients showed drastic variations within a scale of a few days and/or weeks, and these variations were related to sea levels that represent the intrusion of the Kuroshio Water, Intermediate Oyashio Water or deep water from the continental slope. However, there was no consistent trend in the variations in Chl-a, PC, PN and primary production due to the complex effects of these waters.

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Acknowledgments

We thank Mr. Kazuharu Yuasa, captain/owner of the fishing boat “Genshun-maru” for his continuous helpful assistance in fieldwork. We thank Mr. Yoshiaki Yamada, Kanagawa Prefectural Fisheries Technology Center, Mr. Junji Kinoshita, Kanagawa Prefectural Fisheries Technology Center (now: Kanagawa Prefectural Government), and Dr. Takashige Sugimoto, Tokai University, for helpful assistance and valuable comments. Thanks are also due to all members who participated in “Project SHONAM” for helping with fieldwork and analyzing samples. This research was financially supported in part by the Ministry of Education, Culture, Sports Science and Technology of Japan through the “Open Research Center Project” of Nihon University.

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  1. Akihiro Shiomoto

    Present address: Department of Aquatic Bioscience, Faculty of Bioindustry, Tokyo University of Agriculture, Abashiri, Hokkaido, 099-2493, Japan

Authors and Affiliations

  1. Department of Marine Science and Resources, College of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa, 252-0880, Japan

    Koichi Ara & Juro Hiromi

  2. Research Division in Biological Environment Studies, Graduate School of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa, 252-0880, Japan

    Koichi Ara, Koh Yamaki, Keisuke Wada, Satoshi Fukuyama, Takeshi Okutsu, Sadao Nagasaka & Juro Hiromi

  3. Department of Bioenvironmental and Agricultural Engineering, College of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa, 252-0880, Japan

    Sadao Nagasaka

  4. National Research Institute of Fisheries Science, Fisheries Research Agency, Kanazawa-ku, Yokohama, Kanagawa, 236-8648, Japan

    Akihiro Shiomoto

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Ara, K., Yamaki, K., Wada, K. et al. Temporal variability in physicochemical properties, phytoplankton standing crop and primary production for 7 years (2002–2008) in the neritic area of Sagami Bay, Japan. J Oceanogr 67, 87–111 (2011). https://doi.org/10.1007/s10872-011-0010-y

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