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<p>Hydroelectric dams impose several sensorial challenges to fluvial cetaceans such as river dolphins, but echolocation behavioral patterns of these animals remain understudied. We compared echolocation patterns of dolphins of the recently proposed <i>Inia araguaiaensis</i> between one area under the influence of a dam (Tocantins River) and another area with a free-flowing river (Araguaia River). We used the F-POD (a Passive Acoustic Monitoring device) to measure the acoustic presence of dolphins (Minutes of Positive Detection, DPM), the time between consecutive echolocation clicks (Inter-Click Interval, ICI) - used as a proxy for sonar focal distance - and the Click Frequency (CF). DPM was higher in the Tocantins (19.5 DPM/ hour) than in the Araguaia (14.6 DPM/hour), the ICI was lower (faster clicks) in the Tocantins (2.6 ms vs. 8.6 ms, <i>p</i> &lt; 0.001), and the CF of signals was higher in the Tocantins (102&#xa0;kHz vs. 93&#xa0;kHz, <i>p</i> &lt; 0.001). Together, these results point to behavioral differences between echolocation patterns of Tocantins and Araguaia populations. Moreover, these results seem to indicate that dolphins of the Tocantins River adapt their echolocation behavioral patterns to a dammed environment with higher acoustic activity through the production of signals for greater precision.</p>

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Sneaking around: is a dammed environment capable of influencing echolocation behavioral patterns of river dolphins?

  • 期刊论文

  • 发表日期：

    2025年12月20日

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  • Priscila S. R. Lima,
  • Cristiane G. de Moraes,
  • Rodrigo A. Carvalho

摘要

Hydroelectric dams impose several sensorial challenges to fluvial cetaceans such as river dolphins, but echolocation behavioral patterns of these animals remain understudied. We compared echolocation patterns of dolphins of the recently proposed Inia araguaiaensis between one area under the influence of a dam (Tocantins River) and another area with a free-flowing river (Araguaia River). We used the F-POD (a Passive Acoustic Monitoring device) to measure the acoustic presence of dolphins (Minutes of Positive Detection, DPM), the time between consecutive echolocation clicks (Inter-Click Interval, ICI) - used as a proxy for sonar focal distance - and the Click Frequency (CF). DPM was higher in the Tocantins (19.5 DPM/ hour) than in the Araguaia (14.6 DPM/hour), the ICI was lower (faster clicks) in the Tocantins (2.6 ms vs. 8.6 ms, p < 0.001), and the CF of signals was higher in the Tocantins (102 kHz vs. 93 kHz, p < 0.001). Together, these results point to behavioral differences between echolocation patterns of Tocantins and Araguaia populations. Moreover, these results seem to indicate that dolphins of the Tocantins River adapt their echolocation behavioral patterns to a dammed environment with higher acoustic activity through the production of signals for greater precision.