Analysis of primary production in the Seto Inland Sea, Japan, using a simple ecosystem model

1998 ◽  
Vol 54 (2) ◽  
pp. 123-132 ◽  
Author(s):  
Toshiya Hashimoto ◽  
Hidetaka Takeoka
Keyword(s):  
Primary Production ◽  
Ecosystem Model ◽  
Seto Inland Sea ◽  
The Seto Inland Sea

CLIMATE CHANGE IMPACTS ON PRIMARY PRODUCTION AND WATER QUALITY IN THE SETO INLAND SEA UNDER RCP8.5 SCENARIO

2020 ◽  
Vol 76 (2) ◽  
pp. I_1147-I_1152
Author(s):  
Hironori HIGASHI ◽  
Akiko YOKOYAMA ◽  
Satoshi NAKADA ◽  
Hiroshi YOSHINARI ◽  
Hiroshi KOSHIKAWA
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Primary Production ◽  
Climate Change Impacts ◽  
Seto Inland Sea ◽  
The Seto Inland Sea

Photosynthetic property and primary production of phytoplankton in sublittoral sand bank area in the Seto Inland Sea, Japan

2008 ◽  
Vol 23 (6) ◽  
pp. 1025-1032 ◽  
Author(s):  
Motomi Genkai-Kato ◽  
Miyuki Onishi ◽  
Hideyuki Doi ◽  
Kentaro Nozaki ◽  
Kenji Yoshino ◽  
...  
Keyword(s):  
Primary Production ◽  
Seto Inland Sea ◽  
The Seto Inland Sea ◽  
Sand Bank

scholarly journals Historical changes in primary production in the Seto Inland Sea, Japan, after implementing regulations to control the pollutant loads

Water Policy ◽  
2018 ◽  
Vol 20 (4) ◽  
pp. 855-870 ◽  
Author(s):  
Satoshi Nakai ◽  
Youhei Soga ◽  
Satoshi Sekito ◽  
Akira Umehara ◽  
Tetsuji Okuda ◽  
...  
Keyword(s):  
Water Pollution ◽  
Environmental Management ◽  
Primary Production ◽  
Seto Inland Sea ◽  
Load Control ◽  
Red Tides ◽  
Pollutant Load ◽  
Nutrient Loadings ◽  
Management Measures ◽  
The Seto Inland Sea

Abstract A total pollutant load control system (TPLCS) was implemented in the Seto Inland Sea in 1979 to reduce the water pollution and the frequency of red tides. We estimated primary production from 1981 to 2010 to determine the effects of reducing the nutrient loadings from the surrounding land. While primary production has decreased overall in the Seto Inland Sea in response to the TPLCS and the associated reductions in the total nitrogen (T-N) and phosphorus (T-P) loads from land since 1981, the reductions were limited to 4 of its 11 subareas. Primary production has increased in the Harima Nada but has been stable in the Bingo Nada subarea, reflecting the fact that the T-N and T-P stocks have not decreased in these subareas over the study years. The inconsistent responses of the 11 subareas suggest that the characteristics of each subarea should be considered when environmental management measures are established and implemented in the Seto Inland Sea. The controls on the nutrient loadings according to the TPLCS should be modified to permit better management of this semi-enclosed sea.

EVALUATION OF MOUNTAIN AREA AS NON-POINT SOURCE OF NITROGEN FOR SETO INLAND SEA: THE NORTHERN SHIKOKU REGION, JAPAN

2017 ◽  
Author(s):  
Shohei Morisawa ◽  
Shohei Morisawa ◽  
Yukio Komai ◽  
Yukio Komai ◽  
Takao Kunimatsu ◽  
...  
Keyword(s):  
Average Concentration ◽  
Point Sources ◽  
Seto Inland Sea ◽  
Mountain Streams ◽  
Unit Load ◽  
Mountain Areas ◽  
Mountain Area ◽  
The Seto Inland Sea ◽  
Unit Load Method ◽  
Important Position

The northern Shikoku region is located in the Western part of Japan and faces towards the Seto Inland Sea. The forest area, which is one of the non-point sources in the Seto Inland Sea watershed, occupies 75% of the land use in the watershed of the northern Shikoku region. The amount of loadings of nutrients and COD in the Seto Inland Sea has been estimated by the unit load method but actually the data has not been investigated. It is however, necessary to know the real concentration of nitrogen in mountain streams to evaluate the role which is the mountain area plays as non-point sources. Therefore, more water samples of mountain streams in the watershed need to be taken and the concentrations of nitrogen analyzed. The mountain streams in the northern Shikoku area were investigated from April, 2015 to November, 2015. The number of sampling sites was 283, in addition to the past data by Kunimatsu et al. The average concentration of nitrate nitrogen in Ehime, Kagawa, and Tokushima was 0.61mg/L, 0.78mg/L and 0.34mg/L, respectively. The environmental standard range for nitrogen in the Seto Inland Sea is from between less than 0.2mg/L and less than 1mg/L. Therefore, the average concentration of nitrogen in these regions was over category II, and those of mountain streams in Kagawa Prefecture exceeded category III. About 20% of mountain streams were more than 1mg/L. It has become clear that mountain areas occupy an important position as non-point sources for the Seto Inland Sea.

scholarly journals Temporal distribution of primary and secondary production estimated from water quality data in the Seto Inland Sea, Japan

2021 ◽  
Vol 124 ◽  
pp. 107405
Author(s):  
Wataru Nishijima ◽  
Akira Umehara ◽  
Keigo Yamamoto ◽  
Satoshi Asaoka ◽  
Naoki Fujii ◽  
...  
Keyword(s):  
Water Quality ◽  
Secondary Production ◽  
Temporal Distribution ◽  
Seto Inland Sea ◽  
Quality Data ◽  
Water Quality Data ◽  
The Seto Inland Sea
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