Mechanism of oligotrphication elucidated in an intensive bivalve cultured bay

2014 Fiscal Year Final Research Report

• Project/Area Number: 24510003
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: Hokkaido University
• Principal Investigator: KUDO Isao 北海道大学, 水産科学研究科(研究院), 准教授 (00195455)
• Co-Investigator(Kenkyū-buntansha): ISODA Yutaka 北海道大学, 大学院水産科学研究院, 准教授 (10193393)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 貧栄養化 / 陸奥湾 / ホタテガイ養殖 / 栄養塩 / 栄養塩減少傾向 / 持続的漁業生産

Outline of Final Research Achievements

Oligotrophication, decreasing trend of nutrients was examined in Mutsu bay, a semi-enclosed bay where intensive bivalve culture was carried out. Average nutrient concentration has decreased by one-third since 1970s when scallop culture was introduced to the bay. The causes for this oligotrophication were landings of scallop and the increase in deposition of scallop feces to the sediment surface, resulting in the removal of N and P from the bay.

Free Research Field

海洋生物地球化学