Results 21 to 30 of about 117,768 (256)
Songbirds tune their vocal tract to the fundamental frequency of their song [PDF]
Proceedings of the National Academy of Sciences, 2006 In human speech, the sound generated by the larynx is modified by articulatory movements of the upper vocal tract, which acts as a variable resonant filter concentrating energy near particular frequencies, or formants, essential in speech recognition. Despite its potential importance in vocal communication, little is known about the presence of tunable
Riede, T +3 more
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High source levels and small active space of high-pitched song in bowhead whales (Balaena mysticetus). [PDF]
PLoS ONE, 2012 The low-frequency, powerful vocalizations of blue and fin whales may potentially be detected by conspecifics across entire ocean basins. In contrast, humpback and bowhead whales produce equally powerful, but more complex broadband vocalizations composed ...
Outi M Tervo +6 more
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Territorial black-capped chickadee males respond faster to high- than to low-frequency songs in experimentally elevated noise conditions [PDF]
PeerJ, 2017 Low-frequency urban noise can interfere with avian communication through masking. Some species are able to shift the frequency of their vocalizations upwards in noisy conditions, which may reduce the effects of masking.
Stefanie E. LaZerte +2 more
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Frontiers in Ecology and Evolution, 2021 Male crickets and their close relatives bush-crickets (Gryllidae and Tettigoniidae, respectively; Orthoptera and Ensifera) attract distant females by producing loud calling songs.
Thorin Jonsson +3 more
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Fin Whale Song Patterns Shift Over Time in the Central North Pacific
Frontiers in Marine Science, 2020 Male fin whales sing by producing 20 Hz pulses in regular patterns of inter-note intervals. While singing, fin whales may also alternate the frequency ranges of their notes.
Tyler A. Helble +5 more
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Natura Sloveniae, 2003 In September 2000, display song of parti-coloured bat Vespertilio murinus Linnaeus, 1758, was recorded for the first time in Slovenia. Bats emitted the song at four localities near Goteniška gora Mountain in southern Slovenia while flying above the ...
Maja Zagmajster
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PLoS ONE, 2021 Changes in the acoustic signalling of animals occupying urban ecosystems is often associated with the masking effects of noise pollution, but the way in which they respond to noise pollution is not straightforward.
Krzysztof Deoniziak, Tomasz S Osiejuk
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Time-frequency segmentation of bird song in noisy acoustic environments [PDF]
2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2011 Recent work in machine learning considers the problem of identifying bird species from an audio recording. Most methods require segmentation to isolate each syllable of bird call in input audio. Energy-based time-domain segmentation has been successfully applied to low-noise, single-bird recordings.
Lawrence Neal +3 more
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Low-frequency songs lose their potency in noisy urban conditions [PDF]
Proceedings of the National Academy of Sciences, 2011 Many animal species communicate with their mates through acoustic signals, but this communication seems to become a struggle in urbanized areas because of increasing anthropogenic noise levels. Several bird species have been reported to increase song frequency by which they reduce the masking impact of spectrally overlapping noise. However,
Halfwerk, W. +6 more
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Scientific Reports, 2020 Senescence is widespread in nature, often resulting in diminishing survival or reproduction with age, but its role in age-dependent variation in sexual traits is often poorly understood. One reason is that few studies of sexual traits consider non-linear
Mathew L. Berg +6 more
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