魚の海洋無機炭素循環への貢献
R W Wilson1, F J Millero, J R Taylor
1School of Biosciences, University of Exeter, Exeter EX4 4PS, UK. r.w.wilson@ex.ac.uk
まとめ
海洋魚は,海洋カルシウム炭酸生産の重要な源であり,総生産量の3~15%を占めています. 独特の炭酸塩分泌は,海洋のアルカリ性の変化を説明し,炭素循環に影響を与えるかもしれない.
科学分野:
- マリン・バイオロジーの海洋生物学
- 海洋学 海洋学 海洋学
- バイオジオケミストリー バイオジオケミストリー
背景:
- 海洋カルシウム炭酸の生産は,伝統的にココロリトホルスやフォラミニフェラなどのプランクトン生物と関連しています.
- 上部1000メートル以内の海洋の定位可能なアルカリ性の増加は,海洋学者のための長年の論争の的パズルでした.
研究 の 目的:
- 海洋カルシウム炭酸の生産における海洋魚の役割を調査する.
- 魚類由来炭酸塩が海洋の無機炭素循環とアルカリ性への貢献を決定する.
主な方法:
- 海洋魚における炭酸塩の降水率と排泄率を定量化する.
- 炭酸塩の生産を抽出するために世界の魚バイオマスを推定する.
- 魚炭酸塩の化学組成 (例えば,マグネシウム含有量) と溶解性質を分析する.
主要な成果:
- 海洋魚は,下降した炭酸塩を腸から高い割合で産生し排泄することが判明しました.
- 魚類由来炭酸塩は,海洋炭酸塩の総生産に推定3~15%の貢献をしている.
- 魚炭酸はマグネシウムの含有量と溶解性が高く,深度が進むにつれて溶解が速くなり,測定可能なアルカリ性の増加の25%までを説明する可能性がある.
結論:
- 海洋魚は,海洋カルシウム炭酸の生産に以前は認識されていなかった,重要な貢献者を代表しています.
- 魚の炭酸塩溶解は,海洋のアルカリ度予算に決定的な役割を果たし,長年の海洋学上の謎を解く可能性があります.
- 海洋の二酸化炭素の将来の増加は,魚の炭酸塩の生産量の増加につながり,さらに無機炭素循環に影響を与える可能性があります.
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