ブルーナンバブル:絶滅危惧種のイルカの口笛とパルス音の音学的な特徴
Amber Crittenden1,2, Christine Erbe2, Amelia Street1
1Marine Mammal Foundation, Hampton East, Victoria 3188, Australia.
Royal Society open science
|September 2, 2025
まとめ
この研究では 絶滅の危機に瀕しているブルルーンナイルカ (Tursiops australis) の 声の詳細が示され 独特な口笛や 脈拍の音が発せられます この発見は 集団特有の声の違いを強調し このユニークな海洋哺乳類の保全に 極めて重要です
科学分野:
- 海洋生物学
- バイオアコースティック
- 保護科学
背景:
- イルカの声の理解は 種の管理の鍵です
- ブルルーンナイルカ (Tursiops australis) は絶滅の危機に瀕しており,その音響行動に関する研究は限られている.
研究 の 目的:
- イルカの鳴き声とパルス音を 定量的に分析する
- ポート・フィリップ湾とギプスランド湖の2つの居住集団の声調を比較するために
- 他のツルシオプス種と比較して 笛のレパートリーの変化を評価する
主な方法:
- ポートフィリップ湾とギプスランド湖から2016年から2023年に収集された音響データ.
- 12,973の信号の分析: 3,401の口笛と 9,572のパルス音.
- 笛を6つのコントールクラスに,パルス音を4つのクラスに分類する.
主要な成果:
- ホイッスル: アップスイープ (41.46%) と凸 (24.64%) のコントールは最も一般的であり,基本周波数は0.4942.50 kHzであり,持続時間は0.021.86sである.
- 爆破パルス音: 吠え声 (71.74%) 最も一般的;ピーク周波数 0.09 〜 47.81 kHz;持続時間 0.01 〜 5. 29 s.
- ポート・フィリップ・ベイとギプスランド・レイクの人口の間で,より制限されたレパートリーを持つPPBの間で,有意な発声の違いが見つかりました. 他のツルシオプス種と比べると 笛の演奏も様々だった.
結論:
- この研究は,ブルルーン海豚の声の基本データを提供します.
- 特定された集団特有の音響特性は,ターゲット化された保全戦略に不可欠です.
- 声の多様性を理解することで ブルルーンンイルカと他のツルシオプス種の区別がつくようになり 保護活動にも貢献します
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