2005/01/31 第059回 - Dr. Hugo Coops

第59回汽水域懇談会

2月2日(水曜日)夕方より第59回汽水域懇談会を行います。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。

 

『ECOSYSTEM ANALYSIS AND RESTORATION POTENTIAL OF BRACKISH LAKES: SHINJI AND NAKAUMI (JAPAN)』

話題提供:Hugo Coops 博士 島根大学汽水域研究センター
Visiting Professor

Hugo Coops 博士は、オランダ the Institute of Inland Water Management and Waste Water Treatment (RIZA) の senior aquatic ecologist で、今年1月より1年間の予定で Visiting Professor として島根大学汽水域研究センターに勤務されます。
博士は水生植物とそれらを取り巻くエコシステムとの相互作用などを主に研究されており、オランダでは、国レベルでの水資源管理や湖水・水辺の環境・生態系の修復などに携わってこられました。
今回の懇談会では、宍道湖・中海の環境修復のあり方などについて興味深い話が聞けるものと思います。

日時:2月2日(水曜日)午後5時より1時間程度
場所:島根大学汽水域研究センター2階演習室(201)

皆様のご来聴をお待ちしております。

概要:
This presentation will outline the approach that I intend to follow during my stay at the Center in 2005. The particular interest of this study lies in the restoration or rehabilitation of brackish lakes, an issue attracting interest in many places; exemplified by the efforts to restore transitional water bodies in the EU, as well as the issue of changed freshwater inputs to estuaries in the Mediterranean countries, North America and Australia.
Lakes Shinji and Nakaumi form a very interesting study area as they represent a gradient of a freshwater river (River Hii and other tributaries), a moderately brackish lake (Shinji), and a saline lagoon (Nakaumi). Although the water system has been modified in various ways and is currently under a high eutrophication pressure, it still has unique estuarine features supporting a profitable fisheries and is regarded of high value for the local and regional societies.
Ecosystems of freshwater shallow lakes have been investigated throroughly in the past decades. Current understanding of foodweb interactions has led to management practices incorporating both external nutrient control as well as internal measures, including manipulation of foodwebs. However, brackish lakes are much less well understood; they probably respond differently to nutrient supply and control than their freshwater counterparts.
The main issue I want to address is the potential for ecological restoration of the Shinji-Nakaumi lake system. This will include:
- Reference state
- Towards a conceptual model of lake ecosystems
- Use of monitoring data for hypothesis generation
- Focus on keystone organisms: experiments
- Littoral; pelagial interactions
- Restoration targets and scenarios
- Valuation of ecosystem attributes