Atividade bioacústica em ninhos de Eretmochelys imbricata (LINNAEUS, 1766) na Barreira do Inferno - RN
Chelonians communicate mainly through smell and sight, but recent projects have shown a promising potential in the use of acoustic communication for this group, especially in regard to parental care. The research is an investigative analysis on the embryonic and hatchlings sound production in tur...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/27257 |
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| Resumo: | Chelonians communicate mainly through smell and sight, but recent projects have
shown a promising potential in the use of acoustic communication for this group,
especially in regard to parental care. The research is an investigative analysis on the
embryonic and hatchlings sound production in turtles (Eretmochelys imbricata), at
Barreira do Inferno, Parnamirim - RN. For data collection, a TASCAM DR-40 recorder
set to a sampling rate of 96kHz was used. We have analyzed 122 recordings with
presence of eggs or eggs and hatchlings. In addition to the nests, hatchlings were
recorded after nest emergence. Spectrographic analyses were performed on RAVEN
Pro 1.5 software (Cornell Laboratory of Ornithology, Ithaca, NY). A specific window was
used to compose each sound type spectrograms, namely Hamming, with FFT 256 for
types 1 and 2 and 512 for types 3 and 4. Four acoustic patterns were performed for
Eretmochelysimbricata nests and hatchlings in a total of 575 signs. The type 1 signal (N
= 86) has an average duration of 0.0015 s, present up to 64 pulses and an average
peak frequency of 759 Hz. Type 2 (N = 330) is a single pulse, which can appear in
series of up to 25, with an average of 0.001s of duration of each pulse. The average
peak frequency of Sound type 2 is 3055 Hz. The type 3 sound (N = 110) is tonal, formed
by a single band, with frequency modulation and average duration of 0.01 s, the longest
signals found. Type 4 (N = 49), have 2 to 5 harmonics and can have up to 6 inflection
points, with a duration average of 0.07 s. Type 2 appeared on all contexts analyzed.
Tonal sounds like types 3 and 4 were used with more frequency by hatchlings. Acoustic
signals were detected from day 51 postnesting until nest emergence. The results
showed that most emissions are produced overnight. It should be taken into account
that the amount of recordings made in different contexts was not the same. The work is
carried out in partnership with the TAMAR project and presents promising results on the
acoustic communication of hatchlings and embryos of Eretmochelys imbricata. |
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