The abstract is read at the publisher; the summary is JClub's.
Bryde’s whales (Balaenoptera edeni edeni) in Weizhou Island waters produced 729 pulsed low-frequency signals with 20~56 pulses per second, forming three distinct call types.
- Why it matters: Acoustic characterization for this regularly observed coastal group is limited, and local vessel noise effects are poorly quantified, leaving uncertainty about detection and masking risk.
- What they did: From 16 low-disturbance sailboat surveys (11–31 January 2024) with concurrent visual observations, the team measured 729 low-frequency signals and used linear mixed-effects models plus clustering of six standardized parameters.
- The result: Signal duration was negatively correlated with maximum and center frequency, and clustering (adjusted Rand index 0.87; minimum BIC at three components) resolved three co-occurring call types; speedboat passage increased noise by 12.5 dB (20 Hz~20 kHz) and 8.0 dB (400~1100 Hz), reducing the detection margin from 10 dB to about 2 dB.
The findingWhy it mattersWhat they didThe result
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