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バルト海の塩分グラデントに沿ったスポンジHalichondria paniceaの微生物群の変化
Philipp Hoy1, Christiane Hassenrück1, Felix Mittermayer-Schmittmann2
1Leibnitz Institute for Baltic Sea Research Warnemünde (IOW), Rostock, Germany.
Frontiers in microbiology
|February 12, 2026
まとめ
バルト海の海洋スポンジの微生物群は,塩分が減少するにつれて変化し,より低いレベルでの周辺の水と多様性と類似性が増加しています. これは,ディスバイオシスの初期徴候と,その種の宿主体能力の低下を示唆する可能性があります.
科学分野:
- マリン・マイクロバイオロジー
- エコロジー エコロジー エコロジー
- シンビオスのシンビオシス
背景:
- バルト海の塩分傾きは海洋生物に影響を及ぼしますが,宿主に関連する微生物への影響は十分に理解されていません.
- 海洋スポンジは,宿主の健康と機能に不可欠な複雑なプロカリオットコミュニティを宿している.
- スポンジの微生物群が塩分量減少にどのように反応するかを調査することは,その生態学的役割を理解するために極めて重要です.
研究 の 目的:
- バルト海で塩分が下がるグラデントに沿って,海洋の海藻 (Halichondria panicea) の微生物群を分析する.
- 塩分度の変化に反応して,プロカリオートコミュニティの構成,多様性,および豊富さの変化を評価する.
- スポンジの健康とシンビオントの安定性に対する潜在的な影響を調査する.
主な方法:
- スポンジと海水の微生物群の16S rRNA遺伝子メタコード.
- 総プロカリオットスポンジ群と主要共生体 *Ca.の絶対定量化. ハリコンドリバクターシンビオティクス (Halichondribacter symbioticus) *は ddPCR を使った.
- 塩分度範囲の28.3 PSU (カッテガット) から11.4 PSU (バルト海) の *Halichondria panicea* のサンプル採取.
主要な成果:
- スポンジの微生物群は,場所特有で,周囲の水とは異なるもので, *Ca.によって支配されていました. ハリコンドリバクターシンビオティカス*
- 塩分度が低い地域 (東バルト海) では,スポンジの微生物群の多様性が高く,海水の微生物群との類似性が高まった.
- バクテリアの絶対的多数は低塩分度で増加し, *Ca. Halichondribacter symbioticus*は安定したままで,スポンジの体積は減少し,体調の低下を示唆した.
結論:
- バルト海の塩分度が低下すると, *Halichondria panicea* の微生物群が変化し,周囲の水と類似性が増し,潜在的にディスバイオシスを示す可能性があります.
- 最も低い塩分度で観察されたスポンジの適性低下は,微生物のシフトと相関しています.
- この研究は,挑戦的な環境グラデーション内のスポンジの塩分によって引き起こされる微生物群の変化に関する最初の洞察を提供します.
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