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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| Authors: | Koichi Ara Koh Yamaki Keisuke Wada Satoshi Fukuyama Takeshi Okutsu Sadao Nagasaka Akihiro Shiomoto Juro Hiromi |
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| Institution: | (1) Department of Marine Science and Resources, College of Bioresource Sciences, Nihon University, Fujisawa Kanagawa, 252-0880, Japan;(2) Research Division in Biological Environment Studies, Graduate School of Bioresource Sciences, Nihon University, Fujisawa Kanagawa, 252-0880, Japan;(3) Department of Bioenvironmental and Agricultural Engineering, College of Bioresource Sciences, Nihon University, Fujisawa Kanagawa, 252-0880, Japan;(4) National Research Institute of Fisheries Science, Fisheries Research Agency, Kanazawa-ku, Yokohama Kanagawa, 236-8648, Japan;(5) Present address: Department of Aquatic Bioscience, Faculty of Bioindustry, Tokyo University of Agriculture, Abashiri Hokkaido, 099-2493, 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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