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

Light and nutrient limitation on phytoplankton production in the strait of an enclosed coastal sea (Bisan Strait, eastern Seto Inland Sea, Japan)

“…Conversely, our estimated rate is substantially lower than production in adjacent areas, such as the Harima Sound (294 g C m −2 y −1 ) and Osaka Bay (335-825 g C m −2 y −1 ) in the eastern Seto Inland Sea (Tada et al, 1998;Yamaguchi and Imai, 1996), as well as the mean of the entire Inland Sea (218 g C m −2 y −1 , Tada et al, 1998). Our results thus support the previous theory that phytoplankton production in the Bisan Strait is lower than in adjacent areas, and is one of the lowest levels in the Inland Sea (Hashimoto and Takeoka, 1998;Hashimoto et al, 1997;Tada et al, 1998). Our study may also suggest that phytoplankton production is relatively lower in narrow straits than in broad sea areas in this inland sea.…”

“…6). Such temporal variation in phytoplankton production in the Bisan Strait agrees with the results of a previous seasonal study (Tada et al, 1998) and numerical modeling (Hashimoto and Takeoka, 1998). It is thus probable that the low annual phytoplankton production in the Bisan Strait, in comparison with adjacent areas, is related to the lack of maximal production in autumn.…”

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

“…In addition, such measurements are important for the management of fishery resources. The Seto Inland Sea is the largest semienclosed coastal sea in Japan and is known as a treasury of fishery resources (Hashimoto and Takeoka 1998). There are a number of sand banks in the Seto Inland Sea, making patchy shallow zones less than 10 m deep (Yoshino et al 2006).…”

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

“…Based on the kinetics of phytoplankton growth, Pc(z, t) can be regarded as a function of growth-limiting factors, light intensity, and nutrients such as DIN and DIP concentrations (e.g., Hashimoto & Takeoka, 1998;Maar et al, 2016); however, as mentioned later, PP stn in Hiroshima Bay was reproduced well by Pc(z, t), a function of light intensity (Equation ( 4)), as reported by Eilers & Peeters (1988) and Wetsteyn & Kromkamp (1994):…”

“…Most existing mathematical models for estimating primary production by phytoplankton require information on physicochemical and biological parameters, such as light intensity and chlorophyll a concentrations (e.g., Hashimoto & Takeoka, 1998;Maar et al, 2016). Unfortunately, some of the required parameters, such as the light-reachable depth, are not included in the CWQS, and transparency measured with a Secchi disk is used for apparent turbidity.…”