珊瑚の粘液は,リーフの生態系におけるエネルギー伝達器と粒子捕捉器として機能します
Christian Wild1, Markus Huettel, Anke Klueter
1Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany. cwild@mpi-bremen.de
Nature
|March 6, 2004
まとめ
ゾオキサンテリアを宿すサンゴによって生成されるサンゴ粘液は,有機物を捕まえて,ラグーン沈殿物にエネルギーと栄養素を供給します. このプロセスは,珊瑚礁の生態系をサポートし,栄養素の損失を最小限に抑える重要なリサイクルループを生み出します.
科学分野:
- マリン・バイオロジー マリン・バイオロジー
- サンゴ礁の生態学 サンゴ礁の生態学
- バイオジオケミストリー バイオジオケミストリー
背景:
- ゾオキサンヘラは,サンゴ礁の原産物に不可欠です.
- 珊瑚はかなりの量の炭素を放出し,ゾオキサンヘラによって粘液として吸収されます.
- 栄養循環におけるサンゴの粘液の運命と生態学的役割は完全に理解されていません.
研究 の 目的:
- 有機物質を捕獲するサンゴの粘液の役割を調査する.
- 珊瑚の粘液が,珊瑚礁の生態系内でエネルギーと栄養素をどのように運ぶかを決定する.
- リーフ・ラグーンの堆積物におけるサンゴの粘液の劣化と鉱化を評価する.
主な方法:
- グレートバリアリーフのアクロポラサンゴの量化された粘液排泄率.
- 珊瑚の粘液の溶解と分解の速度をサンゴ礁の水とラグーンの砂で測定した.
- 粘液集積物と閉じ込められた粒子の有機炭素と窒素の含有量を分析した.
- リーフ・ラグーン・システム内の粘液の移動と運命を追跡した.
主要な成果:
- アクロポラ (Acropora) のような支配的なサンゴ属は,毎日かなりの量の粘液を放出しています.
- 珊瑚の粘液は, suspended organic matter を効率的に捕らえ,その栄養分を大幅に増加させます.
- 湖の沈殿物は生物触媒のフィルターとして作用し,溶けた粘液を高い速度 (時速少なくとも7%) で分解します.
- 未溶解の粘液集積は潮流によって濃縮され,沈殿物への栄養素の迅速な供給を促進します.
結論:
- 珊瑚の粘液は重要なリンクを形成し,ゾオキサンヘラと閉じ込められた粒子からのエネルギーをベンソスに転送します.
- 珊瑚の粘液は,珊瑚礁の生態系内の重要な栄養素とエネルギーのリサイクルループを容易にします.
- この粘液主導のプロセスは,リーフコミュニティの自立性を高め,生態系の栄養素の損失を軽減します.
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