アミノ酸と警報信号に対するオスファラジウム (Ruditapes decussatus) の電気生理学的反応

Ana Rato^1,2, Joana Costa³, Diana Gonçalves⁴

¹Centre of Marine Sciences (CCMAR), University of Algarve, Campus de Gambelas, Faro, 8005- 139, Portugal. ana.rato@ipma.pt.

Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology

|September 5, 2025

まとめ

カーペット貝はアミノ酸を検出しますがオスフラジウムを通して捕食者の信号は検出できません捕食者を避ける上で重要な役割を担うことを示唆しています

科学分野:

海洋生物学
化学センサーシステム
バイバルブ生理学

背景:

化学的感知は生物の生存に不可欠で餌と捕食者の回避に影響を与えます
双弁動物における化学感知メカニズムはまだ十分に理解されていない.
オスフラジウムは双弁動物における重要な化学感知器官です

研究の目的:

カーペット・シェル・クラゲの化学感知能力を調べるため
オスファラジウムが様々な化学刺激に敏感であるかを評価する
魚介類の行動や捕食者回避における化学的感覚の役割を理解するためです

主な方法:

電気オスフラジオグラム (EOG) 技術を用いた電気生理学的記録
アミノ酸,胆酸,肉食動物 (緑のカニ) と同種/異種双弁動物に対する反応の検査
化学刺激に対するクラゲの反応を観察する行動分析

主要な成果:

オスファラジウムクラゲは,ほとんどのタンパク質生成Lアミノ酸に対して,濃度依存のトニック阻害反応を示した.
酸性アミノ酸,L-アルギニン,または胆汁酸に対する反応は観察されなかった.
強い反応は,傷ついた同種および異種双弁から誘発されましたが,緑のカニからの捕食者からの誘発ではありませんでした.
損傷した同種のシグナルに曝されたクラゲの活動が低下した.

結論:

Ruditapes decussatusのオスファラジウムは特定のアミノ酸や傷ついた双弁から来る警報信号に敏感です
捕食者の検出は捕食者が放出する化学物質ではなく異なる感覚の仕方や特定の警報信号に依存します
電気オスフラジオグラムは,双弁化学感知を研究するための貴重なツールです.
警報信号の特殊な化学的性質を特定するためにさらなる研究が必要である.

キーワード:

アラーム・シグナルアミノ酸ビバルブ電気生理学オスフラジウム捕食者が放出するカイロモン

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