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ロス海における氷の縁の退却によって生じた植物プランクトンの開花:密度フィールドとの空間的な一貫性
まとめ
南極の氷の縁の近くで,密度の高い植物プランクトンの花が発見され,低塩分水域で繁栄しました. 氷の融解と安定性の向上によって助長されたこの咲きは,高い生物学的シリカ濃度を示した.
科学分野:
- マリン・バイオロジーの海洋生物学
- 海洋学 海洋学とは
- 南極大陸の研究研究
背景:
- 南極大陸の氷の縁が収縮すると,ユニークな海洋環境が生まれます.
- 氷の融解は,塩分を減少させ,地表水の垂直安定性を高めます.
- 融解した氷から放出されたエポント藻は,生物学的インノキュラムとして機能することができます.
研究 の 目的:
- 退却する氷の縁の近くの植物プランクトンの開花の発生と特徴を調査する.
- 花の形成と組成に影響を与える環境要因を理解する.
- クロロフィール,炭素粒子,バイオジニックシリカの濃度を分析する.
主な方法:
- クロロフィール,炭素粒子,バイオジニックシリカの測定.
- 水の塩分と垂直安定性の分析.
- 氷の縁と塩分度の梯度に相対的に咲く範囲の空間的なマッピング.
主要な成果:
- 密度の高い植物プランクトンの花が氷の縁から250kmまで広がっていることが確認されました.
- 咲いたのは,氷の融解によって塩分が減った地域に限られていた.
- 異常に高い有機炭素とクロロフィルの比率,および生物学的シリカと炭素の比率が観察されました.
- 中程度のクロロフィル濃度にもかかわらず,高濃度の生体性シリカが存在していました.
結論:
- 塩分量が減少し,氷の縁の退却の近くに垂直的な安定性が向上すると,植物プランクトンの開花が好まれる.
- 融解する氷は,これらの咲き始めに不可欠なインオキュラムを提供することができます.
- 咲く組成は,高い生物学的シリカ含有量で特徴付けられ,特定の植物プランクトンコミュニティまたは生理学的状態を示しています.
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