EFFECT OF HABITAT IMPROVEMENT BY THREE TYPES OF PORT STRUCTURES SYMBIOTIC WITH NATURAL ENVIRONMENT

Abstract

 Three types of port structures that promoted symbiotic relationships with organisms were experimentally constructed at Sakai-semboku Port, which is located in the estuary part of Yamato River in 2009. Field measurements of water quality, seaweeds and creatures have been carried out for six years after the construction. Results of water quality measurements showed that hypoxic water reached up to 2 m below the sea surface from August to September. The biological measurement showed recruitment of Caloglossa ogasawaraensis, Corbicula japonica, Anguilla, Plecoglossus altivelis and so on, from the first year, though the water quality condition was highly eutrophic. In addition, they persisted for six years.