Temporal and spectral patterns of fish choruses in two protected areas in southern Atlantic

Sánchez-Gendriz, Ignacio; Padovese, Linilson Rodrigues

doi:10.1016/j.ecoinf.2017.01.003

Cited by 18 publications

(9 citation statements)

References 29 publications

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“…More importantly, it contains spectral peaks that are relatively evenly distributed within the frequency domain of some fish. The frequency defined by the inverse of the time between spectral peaks is called the "pulse repetition frequency, " where the pulses are triggered by muscle contractions (Oppenheim and Schafer, 2004;McCauley, 2012;Parsons et al, 2013Parsons et al, , 2016aSánchez-Gendriz and Padovese, 2017a). In the chorus reported herein, the time between pulses is about 4.3 ms, so the inverse is 233 Hz, which is consistent with the interval of the spectral peaks.…”

Section: Discussionsupporting

confidence: 63%

A Fish Chorus on the Margin of New Jersey Atlantic Continental Shelf

Zhang

Katsnelson

2021

Front. Mar. Sci.

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We report herein an underwater biological chorus coming from the margin of the New Jersey Atlantic continental shelf that we tentatively attribute to a species of fish. The chorus occurred every night for over a month during the Shallow Water 2006 experiment and covers the frequency band 150–4,800 Hz, with maximum intensity in the band from 1450 to 2,000 Hz. Remarkable intensity peaks occurred at 500, 725, 960, 1,215, 1,465, 1,700, and 1,920 Hz, rising to as much as 20 dB above the background noise without the chorus. The chorus begins at sunset and reaches its maximum intensity within an hour, following which it weakens slightly and then gradually climbs again to a peak before sunrise, at which point it quickly weakens and disappears. Its frequency-domain characteristics and the nocturnal timing are reminiscent of sound produced by underwater animals. The intensity of the chorus weakens along the across-shelf path going shoreward, which indicates that the chorus originates from the margin of the continental shelf rather than from the coastal zone, as is generally considered. The chorus contains a single type of acoustic signal that takes the form of double-pulse bursts that last about 8.7 ms, with each pulse containing several acoustic cycles. The time interval between successive bursts varies from 1.5 to 1.9 s. Signals containing a number of bursts vary in length from tens to hundreds of seconds. Although it is impossible to determine the fish species responsible for the chorus, its characteristics, including its low frequency and intensity, its single type of short-duration sound signal, and its multiple peaks in the frequency domain, are all consistent with the general characteristics of fish sounds.

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Section: Discussionsupporting

confidence: 63%

A Fish Chorus on the Margin of New Jersey Atlantic Continental Shelf

Zhang

Katsnelson

2021

Front. Mar. Sci.

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“…Similar frequency band of choruses founded in this study have been found in fish detected in marine protected areas in southeastern sub-tropical regions of Brazil (Sánchez-Gendriz and Padovese 2016), although they are produced at different times of the day. There was no temporal competition between them, but rather a temporal overlaping observed during the early morning hours (Sánchez-Gendriz and Padovese 2017). This could indicate that fish species emitting this type of signal may have a wide distribution on the Brazilian coast, occurring in both tropical and temperate waters.…”

Section: Discussionmentioning

confidence: 85%

Soundscape of protected and unprotected tropical Atlantic coastal coral reefs

Borie

Rezende²,

Ferreira

et al. 2021

scimar

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Behavioural patterns and distributions of crustaceans, fish and mammals can be inferred from acoustic recordings of the extremely noisy marine acoustic environment. In this study, we determined the soundscape of protected and non-protected marine areas between January and April 2016. Sonobuoy (a device for sound monitoring) recordings began at sunset and lasted approximately 12 hours per day. The results show a complex soundscape dominated by biological sounds produced by crustaceans and fish. Six fish chorus-dominant frequencies between 200 and 1000 Hz occurred at a similar time each day, except for chorus I. The choruses consisted of high-energy callings after the last reef line within the protected area. However, fish choruses showed low energy levels in unprotected areas. The results show the importance of protected areas for fish populations and the usefulness of passive acoustics to monitor biodiversity of sounds of commercial fish in Brazilian tropical costal reefs.

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“…The XJSP conservation unit encompasses a marine area SW of the Santos Bay and an adjacent inland region of tropical forest. This is an area with strong human presence, close to a very busy port in Brazil (Sánchez‐gendriz & Padovese, , ).…”

Section: Resultsmentioning

confidence: 99%

Automatic detection of vessel signatures in audio recordings with spectral amplitude variation signature

2019

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Sound emissions by ships and boats can strongly impact marine life, with potential to affect communications, breeding and prey and predator relationships. Automatic detection of boat signatures in underwater audio recordings is thus an important task. Automated solutions are particularly relevant for monitoring preservation areas where the presence of watercrafts is usually regulated. The task is particularly challenging because it requires distinguishing multiple overlapping acoustic events in typically noisy audio recordings. In this paper, we introduce an algorithm for boat and ship detection which computes an acoustic signature that captures the variance in the frequency amplitudes observed over the duration of the signal. We evaluated the algorithm on a database of underwater recordings collected at two conservation areas in the State of São Paulo, Brazil, with very good results, and also compared it with an existing solution. Besides being effective, the algorithm requires limited user input and no parameter fine tuning to handle diverse situations. It thus provides a solution to automate the detection of vessels, with potential applications for monitoring marine preservation areas.

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Temporal and spectral patterns of fish choruses in two protected areas in southern Atlantic

Cited by 18 publications

References 29 publications

A Fish Chorus on the Margin of New Jersey Atlantic Continental Shelf

A Fish Chorus on the Margin of New Jersey Atlantic Continental Shelf

Soundscape of protected and unprotected tropical Atlantic coastal coral reefs

Automatic detection of vessel signatures in audio recordings with spectral amplitude variation signature

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