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常见海豚哨声对实验中频声纳的响应

Caroline Casey^1,2, Selene Fregosi¹, Julie N Oswald³

¹Southall Environmental Associates, Inc., Aptos, California, United States of America.

|April 26, 2024

概括

在暴露于中频主动声纳 (MFAS) 后,普通海豚显示出哨声频率的立即和显著变化. 这些声响通过重复暴露而持续存在,表明对海洋哺乳动物通信的潜在影响.

科学领域:

海洋哺乳动物的行为
生物声学是一种生物声学.
人类造成的海洋噪音

背景情况:

海洋海豚经常在海军作战区遇到强烈的军事声纳.
测量声纳对社交,自由活动的海豚的行为影响是很困难的.
需要基线语音行为数据来评估人为干扰效应.

研究的目的:

为了研究中频主动声纳 (MFAS) 对海豚口哨产生的影响.
分析行为反应,使用不同的时间窗口进行声学分析.
为了了解普通海豚 (Delphinus delphis) 对模拟声纳的反应.

主要方法:

通过使用漂流声浮标网络进行受控暴露实验.
模拟的海军中频主动声纳 (MFAS) 在3-4kHz.
在5秒到10分钟的时间窗口中,分析了短嘴和长嘴普通海豚的哨声产量.

主要成果:

普通海豚在MFAS暴露后5秒内表现出尖,明显的哨声频率变化.
这种口哨率响应在连续的MFAS暴露中持续存在.
检测到对MFAS的短暂,明显可测量的声学反应,表明习惯性有限.

结论:

普通海豚对中频主动声纳显示可检测的声学反应.
可变时间分析窗口对于检测对声纳的行为反应至关重要.
未来的研究应该确定基线声率,以分析海洋哺乳动物对干扰的反应.

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