Flow control technology for enhancement and diverse use of the marine environment

Ueshima, Hideki; Tanabe, H.; Takarada, Moriyasu; Yuasa, Ichiro; Hashimoto, Eisuke; Yamasaki, Munehiro

doi:10.1016/0025-326x(91)90773-l

Cited by 2 publications

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“…In the eastern part of Osaka Bay, Japan, there exists the conspicuous circulation in the surface layer and an oceanic front found in the western end of the circulation (Ueshima et al, 1987(Ueshima et al, , 1991. These features are the key processes in the occurrence of the red tide and the anoxic water mass (Joh, 1986).…”

Section: Introductionmentioning

confidence: 99%

A tidal front in winter influenced by river discharge

Yuasa¹,

Ueshima²

1992

J Oceanogr

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Water quality of Osaka Bay is greatly influenced by freshwater discharge from rivers, to the effect of salinity playing a major role in forming the stratification. The tidal front is expected to appear in such an area even in winter considering the theory of the formation of a tidal front. From the field observation, we recognized a tidal front in winter for the first time in Osaka Bay. The critical value of a parameter log(H/U 3 ) for generation of a tidal front is obtained as a function of river discharge and cooling effect through sea surface. Differences of nutrients (NH 4 -N, PO 4 -P) concentration across the front are not clear, probably because they are utilized by phytoplankton easily. But in (NO 2 -N)+(NO 3 -N), DIN, PP and T-P, there is a discontinuity structure across the front, even if the absolute value of concentration difference is small.

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Section: Introductionmentioning

confidence: 99%

A tidal front in winter influenced by river discharge

Yuasa¹,

Ueshima²

1992

J Oceanogr

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Characterization of Microbial Community Structure in the Surface Sediment of Osaka Bay, Japan, by Phospholipid Fatty Acid Analysis

Rajendran

Matsuda

Urushigawa³

et al. 1994

Appl Environ Microbiol

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Twenty-eight sediment samples collected from Osaka Bay, Japan, were analyzed for phospholipid esterlinked fatty acids (PLFA) to determine regional differences in microbial community structure of the bay. The abundance of three major groups of C10 to Clg PLFA (saturated, branched, and monounsaturated PLFA), which accounted for 84 to 97% of the total PLFA, indicated the predominance of prokaryotes in the sediment. The distribution of six clusters obtained by similarity analysis in the bay revealed a marked regional distribution in the PLFA profiles. Total PLFA concentrations (0.56 to 2.97 ,g/g [dry weight] of the sediment) in sediments also showed marked variation among the stations, with higher concentrations of total PLFA in the central part of the bay. The biomass, calculated on the basis of total PLFA concentration, ranged from 0.25 x 108 to 1.35 x 108 cells per g (dry weight) of the sediment. The relative dominance of microbial groups in sediments was described by using the reported bacterial biomarker fatty acids. Very small amounts of the characteristic PLFA of microeukaryotes in sediments indicated the restricted distribution of microeukaryotes. By examining the distribution of clusters and groups of microorganisms in the bay, there were two characteristics of the distribution pattern: (i) the predominance of anaerobic bacteria and gram-positive prokaryotes, characterized by the high proportions of branched PLFA in the eastern and northeastern sides of the bay, where the reported concentrations of pollutants were also high, and (ii) the predominance of aerobic prokaryotes and eukaryotes, except for a few stations, in the western and southwestern sides of the bay, as evidenced by the large amounts of monounsaturated PLFA. Such significant regional differences in microbial community structure of the bay indicate shifts in microbial community structure.

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Flow control technology for enhancement and diverse use of the marine environment

Cited by 2 publications

References 0 publications

A tidal front in winter influenced by river discharge

A tidal front in winter influenced by river discharge

Characterization of Microbial Community Structure in the Surface Sediment of Osaka Bay, Japan, by Phospholipid Fatty Acid Analysis

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