混生種群における奇異性効果仮説の検証

Zaharia A Selman^1,2, Eric K Frazier^1,2, Colton B Adams^1,3,4

¹Department of Psychology, University of Tennessee, Knoxville, Tennessee, United States of America.

PloS one

|January 30, 2026

まとめ

捕食者の発見後、混生種群における表現型的に稀な鳥は鳴き声を上げるのが遅かった。これは奇異性効果仮説を支持し、稀な個体は捕食を避けるためにシグナル伝達を遅らせることを示唆している。

科学分野:

行動生態学
鳥類学
捕食者-被食者関係

背景:

集団生活は利点をもたらすが、稀な個体にとってはリスクとなる可能性がある。
奇異性効果仮説は、稀な個体が捕食者に標的にされる可能性があり、行動を変化させる可能性があることを示唆している。
混生種群における稀少性が捕食回避行動に及ぼす影響に関する経験的データは限られている。

主な方法:

捕食者モデルを含む2つの公表された野外実験からのデータの分析。
カロライナヒガラ、ツツイロコガラ、およびシロハラシジュウカラの鳴き声の潜時の測定。
単独の稀な個体がいる群と複数の同種個体がいる群での鳴き声の潜時の比較。

結論:

混生種群における表現型的に稀な鳥は、捕食リスクを低減するために発声を遅らせる可能性があることが示唆された。
奇異性効果仮説は支持されたが、サンプルサイズが小さいことは注意を要する。
稀少性は、鳥類のコミュニティにおける複雑な社会的文脈内での捕食回避行動に影響を与える。

キーワード:

奇異性効果混生種群捕食回避鳴き声の遅延鳥類行動生態学

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