Fin whale (Balaenoptera physalus) song pattern in the southern Chukchi Sea

Furumaki, Shiho; Tsujii, Koki; Mitani, Yoko

doi:10.1007/s00300-021-02855-y

Cited by 9 publications

(10 citation statements)

References 26 publications

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“…Atlantic – 0.5 s/year – + 5.5 s Watkins et al 5 N.W. Atlantic – – – + 6 s Furumaki et al 46 Chukchi Sea – 0.5 s/year – + 1 s Širović et al 24 Gulf of California – 1 s/year – + 8 s Wood and Širović 20 W. Antarctic − 0.2 Hz/year 0.1 s/year – – Ours Mediterranean – 0.1 s/year –0.1 Hz/month – …”

Section: Discussionmentioning

confidence: 98%

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Temporal evolution of the Mediterranean fin whale song

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Marxer

Paris

et al. 2022

Sci Rep

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We present an analysis of fin whale (Balaenoptera physalus) songs on passive acoustic recordings from the Pelagos Sanctuary (Western Mediterranean Basin). The recordings were gathered between 2008 and 2018 using 2 different hydrophone stations. We show how 20 Hz fin whale pulses can be automatically detected using a low complexity convolutional neural network (CNN) despite data variability (different recording devices exposed to diverse noises). The pulses were further classified into the two categories described in past studies and inter pulse intervals (IPI) were measured. The results confirm previous observations on the local relationship between pulse type and IPI with substantially more data. Furthermore we show inter-annual shifts in IPI and an intra-annual trend in pulse center frequency. This study provides new elements of comparison for the understanding of long term fin whale song trends worldwide.

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Section: Discussionmentioning

confidence: 98%

“…These are called doublet patterns, as opposed to singlets where only one IPI occurs. In doublets there is sometimes a strong relationship between IPI and pulse type: there is one IPI from A to B, and another one from B to A 10,11,[21][22][23] . On the other hand, singlets also follow their own stereotypical IPI.…”

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confidence: 99%

Temporal evolution of the Mediterranean fin whale song

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Marxer

Paris

et al. 2022

Sci Rep

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“…The decrease in song frequency by 3 Hz over 15 years, which averages a change of -0.2 Hz/year, agrees with previous reports of declining fin whale song frequency from the North Pacific and measured by the frequency of the 20 Hz pulse [ 31 , 35 ]. Other studies have also reported lengthening IPI in song over time, from +0.58 s/year [ 35 ] to +1 s/year [ 36 ] while the IPI of song in WAP appears to change at a rate of +0.13 s/year. These changes tend to occur in small enough increments that the song is recognizable from year to year.…”

Section: Discussionmentioning

confidence: 96%

“…Across ocean basins, a downward shift in song frequency has been observed in populations of blue whales [ 30 – 33 ], bowhead whales ( Balaena mysticetus ) [ 34 ], and fin whales [ 31 , 35 ]. In fin whales, inter-pulse interval (IPI) values have been observed to lengthen over time [ 16 , 35 , 36 ] and evidence of sudden changes in song IPI have been found as well [ 16 , 37 ]. In order to use song as a population indicator, it is important to understand the song changes to understand when a new song is indicative of a change in song preference or the presence of a new population.…”

Section: Introductionmentioning

confidence: 99%

“…While the frequency of these overtones differs among populations, it appears to be relatively consistent over time [ 20 , 28 , 39 – 41 ]. The 20 Hz pulses occur at regular intervals, measured by the inter-pulse interval (IPI); the spacing of the pulses is regionally specific [ 16 , 19 – 21 , 24 , 28 , 29 , 36 , 37 , 42 ]. The combination of overtone frequency, IPI value, and pattern make a song type which can be used to aid in differentiating among populations of fin whales, even those that occur in close proximity [ 16 , 20 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of fin whale song off the Western Antarctic Peninsula

Wood

Širović²

2022

PLoS ONE

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Song is produced by a variety of terrestrial and marine animals and is particularly common among baleen whales. Fin whale (Balaenoptera physalus) song is comprised of relatively simple 20 Hz pulses produced at regular intervals. The timing of these intervals, in addition to the presence and frequency of overtones, appears to be unique to each population. The purpose of this study was to characterize Western Antarctic Peninsula fin whale song and describe temporal pattern variations in song type and occurrence. Recordings were collected in the area from 2001–2004 and again 2014–2016. One song type was identified with a primary inter-pulse interval (IPI) of approximately 14 s and secondary IPI of 12.5 s. This song occurred in three pattern variants: singlet, doublet, and long triplet. The interval between pulses increased by 1.5 s between recording periods while the frequency of the overtones decreased from 89 Hz to 86 Hz. Song was never recorded in August and while it was recorded at other times in some years, it was consistently present in recordings from April through June across all years. While multiple pattern variants were present each year, singlets were generally the most prevalent variant. Doublets and triplets occurred from February through June, with highest levels of variants in February. In later years the triplet variant presence increased and in 2016 it comprised 53% of recorded song bouts. Further research is needed to understand the reasons why song changes over time and to examine the feasibility of using song to delineate and identify populations.

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