第136回汽水域懇談会 -高田 裕行 博士- のお知らせ【07/06開催】

2018年6月29日

<img title="180706seminar136TOP.jpg" src="/_files/00274036/180706seminar136TOP.jpg" alt="180706seminar136TOP.jpg" />

 第136回の懇談会は高田 裕行 博士(釜山大学海洋学科・博士研究員 / エスチュアリー研究センター 協力研究員)の話題提供で行います。皆様お誘い合わせの上、ご参加下さいますようお願い申し上げます。
 尚、本講演は主に英語で行われます。


第136回汽水域懇談会

題目 : Dispersal potential of neritic benthic foraminifera in Maizuru Bay and Aso-kai lagoon: implications for the study of the East Asian winter monsoon
「若狭湾沿岸域(舞鶴湾・阿蘇海)における底生有孔虫の分散と過去の東アジア冬季モンスーン変動に対する考察」
話題提供者 : 高田 裕行 博士 (釜山大学海洋学科・博士研究員 / エスチュアリー研究センター 協力研究員)
日時 : 2018年7月6日(金) 17:00–18:00
場所 : 島根大学 研究・学術情報機構 エスチュアリー研究センター 2階セミナー室(201号室)

【発表の概要】
 The East Asian monsoon, the climate system that encompasses the Japanese islands, has two phases: the summer and winter monsoon. We have studied the influence of the East Asian winter monsoon on coastal environments in Aso-kai lagoon, central Japan, based on both stable oxygen isotope ratios of bivalves and the faunal composition of benthic foraminifera. We focus on occurrences of modern bivalves and benthic foraminifera in Maizuru Bay, a nearby analogue to ancient Aso-kai lagoon.
 We have studied benthic foraminifera in Maizuru Bay since 2016, in order to understand how variation in the East Asian winter monsoon could affect species dispersal. Some of the common species of benthic foraminifera show complicated distributions with high temporal variation. Previous studies have described these species as opportunistic species. Benthic foraminifera in bay environments commonly show lateral variation toward the inner portion of the bay, with decreasing species richness due to more frequent fluctuations in salinity and/or dissolved oxygen content in hypolimnetic waters. In contrast, the lateral variation of species diversity does not have a marked trend in Maizuru Bay. These features imply that the benthic foraminiferal fauna in Maizuru Bay may be largely maintained by the dispersal of juveniles during intense mixing of the coastal waters in the winter. We will discuss the relationship between benthic foraminifera species distribution and the intensity of the East Asian winter monsoon.


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