Aims of hte basic resenrches of Grent Cormorant(<i>Phalacrocorax carbo</i>), assessment of its impact and the damage control

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  • カワウの基礎研究と応用研究　　カワウに関する基礎研究と被害評価とその解決のための応用研究における課題
  • カワウ ニ カンスル キソ ケンキュウ ト ヒガイ ヒョウカ ト ソノ カイケツ ノ タメ ノ オウヨウ ケンキュウ ニ オケル カダイ

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The Great Cormorant (Phalacrocorax carbo), a high-trophic level consumer in the wetland ecosystem, nests in the colonies sometimes in urban areas. Recent expansion of its distribution and the increase of the population size are presumably attributed to the changes both of the human activities and the wetland ecosystems in Japan. The Great Cormorants occurred widely throughout Japan before 1940, then both their ranges and numbers decreased, so that by the beginning of the 1970s this species was considered as threatened. Subsequently, however, the population size has increased gradually, then during the 1990s the population underwent rapid increase in numbers and spread widely. As a consequence, they gave impacts on forests where they nest and inland fisheries. In order to assess the extent of the current impacts and to control the damage, the four meetings were held between 1998 and 2001 during the annual meeting of the Ornithological Society of Japan. The meetings were steered by cormorant researchers, in which the coexistence of people and Great Cormorants was discussed. The special issues in this volume summarise the results of these meetings.

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