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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Memorandum of Understanding on the Conservation of Migratory Sharks ： ウィキペディア英語版 Memorandum of Understanding on the Conservation of Migratory Sharks The Memorandum of Understanding on the Conservation of Migratory Sharks is an international instrument for the conservation of migratory species of sharks. It was founded under the auspices of the Convention on the Conservation of Migratory Species of Wild Animals (CMS; also known as the Bonn Convention). ==Background== Many sharks are apex predators and keystone species, meaning that they are at the top of their food chain and play a crucial role in maintaining the health of marine environments. Sharks whose members cyclically and predictably move large distances are considered migratory and many pelagic (open ocean) shark species fall into this category. The IUCN considers one third of all shark species as threatened or near threatened. For migratory sharks the situation is worse, with almost 50% being considered as threatened and 27% being considered as near threatened.〔("Review of Migratory Chondrichthyan Fishes" ), ''CMS Technical Series No.15'', 2007 〕 Relatively little is known about the behavior of migratory sharks; researchers have been surprised by data on their migrations. Knowledge of 47% of sharks is too limited to determine a conservation status. Before the Migratory Shark MoU was developed, there were no international standards for the management of migratory sharks. Sharks that migrate can travel great distances in the world's oceans, with the whale shark being recorded on journeys of up to long. These extensive migrations frequently and inevitably involve the crossing of national boundaries and through international waters; as the national regulations of coastal nations only apply to 200 nautical miles (370 km) of their coastlines, large parts of these journeys are consequently unregulated. The Migratory Shark MoU was the first global instrument published by the CMS,〔(【引用サイトリンク】title=Convention on Migratory Species )〕 and the first one ever regarding sharks. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Memorandum of Understanding on the Conservation of Migratory Sharks」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.