イリプロジェクト講演会

みなさま
(English text is following after Japanese text.)

3月9日（月）に、ロシア科学アカデミー動物学研究所Nick Aladin教授をお招きして、イリプロジェクト講演会を開催いたします。

Aladin教授は、アラル海周辺地域で過去40回以上の調査を実施してこられました。2003年の第10回世界湖沼会議（シカゴ）においては、アラル海の縮小にともなう湖水塩分濃度の上昇や、生態環境の悪化、周辺住民の健康被害について警鐘をならすなど、アラル海問題研究における世界的な第一人者のおひとりです。

年度末のお忙しい時期とは存じますが、多くの方にご参加いただければ幸いに存じます。

日  時：	2009年3月9日（月）14：00−16：00
場  所：	総合地球環境学研究所 講演室 アクセス
演  者：	Nick Aladin氏（ロシア科学アカデミー動物学研究所・教授）
題  目：	Aral Sea and its modern state as a cascade lakes complex of residual water bodies
言  語：	英  語

Date:	March 9, 2009   14:00-16:00
Venue:	Lecture hall, Research Institute for Humanity and Nature access
Speaker:	Prof. Nick Aladin（Full Professor in Zoology, Zoological Institute of Russian Academy of Sciences）
Title:	Aral Sea and its modern state as a cascade lakes complex of residual water bodies
Language:	English

Abstract:

■Aral Sea and its modern state as a cascade lakes complex of residual water bodies

■Aladin N.V., Plotnikov I.S（Zoological Institute of Russian Academy of Sciences, St.Petersburg, Russia）

  In the first half of the 20th century, the Aral Sea was a single terminal water body of two rivers in the arid zone. The main part of its water area was brackish with specific aboriginal brackish water ecosystems. Since 1960s, decrease of level and salinization of the Aral Sea have begun. Due to the structure of its depression the Aral Sea began to split into several residual water bodies. In 1988-1989, when level decreased by 13 m, the Aral Sea was divided into 2 polyhaline terminal lakes with marine ecosystems - the Large and Small Aral. In the fauna, only widely euryhaline species remained due to water salinization and introduction of exotic species.

  Piscifauna consisted of introduced species of marine origin. In spring 1990, level of the Small Aral increased and a water flow to the Large Aral appeared. The threat appeared of moving the Syrdarya River mouth to the Large Aral. In August 1992 a dike was built in the Berg's Strait. Salinity growth in the Small Aral stopped; the salinity began to decrease what was favourable to the fauna. Conditions of transitioinal brackishwater-marine salinity zone were formed. In April 1999, the dike was destroyed by a storm. Construction of new solid dike started in 2004 and was finished in autumn 2005. After Aral Sea division, salinization and level fall in the Large Aral became faster. The Large Aral was divided into the Western Aral, Eastern Aral and Tschebas Bay. Salinity in the eastern basin is growing faster than in the western one. In the late 1990s, the Large Aral became hyperhaline with specific fauna. Some invertebrate species inhabiting saline water bodies in the Aral Sea region moved into the Large Aral by natural way. Among them, the brine shrimp (Artemia parthenogenetica) became predominating in zooplankton.

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Mitsuko WATANABE

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