海洋生物多様性のホットスポットと熱帯礁の保全優先事項

Callum M Roberts¹, Colin J McClean, John E N Veron

¹Department of Organismic and Evolutionary Biology, Harvard University, Cambridge MA 02138, USA. cr10@york.ac.uk

Science (New York, N.Y.)

|February 16, 2002

まとめ

珊瑚礁は膨大な生物多様性を備えているが,地球規模での劣化に直面している. 多くのサンゴ礁種の生息範囲は制限されており,人間の影響や絶滅の可能性に脆弱な固有の中心地に集中しています.

科学分野:

マリン・バイオロジーマリン・バイオロジー
エコロジーエコロジーエコロジー
保護科学保護科学保護科学

背景:

サンゴ礁は,高い生物多様性で特徴づけられる重要な海洋生態系です.
これらの生態系は現在,人為的な活動と気候変動による広範な退廃を経験しています.

研究の目的:

リーフに関連した種の地理的分布を分析し,制限範囲の種の高濃度地域を特定する.
絶滅の脅威に対するこれらの種およびその在来地の脆弱性を評価する.

主な方法:

リーフ魚,サンゴ,スナイル,ロブスターなど,3235種の地域分布の分析が行われました.
エンドミズムの中心部を特定し,これらの地域内の制限範囲の種の割合を定量化しました.
これらの生物多様性のホットスポットと,人間の活動によって影響を受ける地域との重複を評価した.

主要な成果:

分析された分類種の7.2%から53.6%は,地理的に非常に制限された範囲を示しています.
海洋のわずかな部分をカバーする10の主要な寄生地の中心では,限られた範囲の種の44.8%から54.2%が住んでいます.
これらの特有病原体の多くは,人間の活動に大きく影響された地域にあり,絶滅のリスクを高めています.

結論:

珊瑚礁の限られた範囲の種は,特定の固有のセンターに集中しており,非常に脆弱です.
絶滅危惧地域は,生物多様性の重要なホットスポットであり,緊急の保全の注意が必要である.
これらのホットスポットでの有目的の保全活動は,熱帯礁の生物多様性の損失を軽減し,絶滅を防ぐことができます.

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