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Oxygen-Deficient Waters along the Japanese Coast and Their Effects upon the Estuarine Ecosystem

Aichi Fisheries Research Institute, 97, Wakamiya, Miya-cho, Gamagori, 443, Japan

View larger version (49K): [in a new window]   Fig. 1. Sea areas of Japan where development of oxygen-deficient water masses occurs

View larger version (49K): [in a new window]   Fig. 2. Nutrient load input to major bays (Tokyo, Osaka, Ise, and Mikawa) where dissolved oxygen–deficient water masses are known to develop

View larger version (69K): [in a new window]   Fig. 3. Breakdown by source of nutrient loads to major bays (Tokyo, Osaka, Ise, and Mikawa) where dissolved oxygen–deficient water masses occur

View larger version (30K): [in a new window]   Fig. 4. Geographical image of Mikawa Bay

View larger version (67K): [in a new window]   Fig. 5. Vertical distribution of residual currents in Mikawa Bay in summer calculated by a hydrodynamic model

View larger version (59K): [in a new window]   Fig. 6. Vertical distribution of dissolved oxygen concentration in Mikawa Bay in summer

View larger version (55K): [in a new window]   Fig. 7. Example of the distribution of dissolved oxygen–deficient water masses in Mikawa Bay. Four legends denote the level of dissolved oxygen saturation percentage

View larger version (48K): [in a new window]   Fig. 8. Correspondence of the development of oxygen-deficient water masses and catch by small trawl fisheries in Mikawa Bay in the summer of 1986

View larger version (13K): [in a new window]   Fig. 9. Transition of transparency and nitrogen load in Mikawa Bay

View larger version (27K): [in a new window]   Fig. 10. Transition of the total number of days red tides were observed and the areal proportion of oxygen-deficient water with less than 30% saturation in Mikawa Bay

View larger version (15K): [in a new window]   Fig. 11. Transition of the total number of days red tides were observed and the area of reclaimed land in Mikawa Bay

View larger version (39K): [in a new window]   Fig. 12. Time-series changes of water temperature, salinity, and degree of dissolved oxygen concentration immediately above the bottom sediment in shallow areas of Mikawa Bay and changes in the benthic community (bacteria, benthic micro algae, meiobenthos, and macrobenthos) from June to the end of July in 1996

View larger version (49K): [in a new window]   Fig. 13. Circulation of nitrogen in shallow areas of Mikawa Bay on 1 June 1996

View larger version (49K): [in a new window]   Fig. 14. Circulation of nitrogen in shallow areas in Mikawa Bay on 29 July 1996

View larger version (54K): [in a new window]   Fig. 15. Change of the nitrogen budget between seawater and sediment from 1 June to 29 July 1996