02158nas a2200217   4500008004100000022001400041245008400055210006900139260001600208520148700224653001701711653001401728653000901742653001701751100002301768700002501791700002701816700002101843700002001864856005601884       2019                        eng d  a0720-213X00aSound production mechanism in the Brazilian spiny lobsters (Family Palinuridae)0 aSound production mechanism in the Brazilian spiny lobsters Famil  cApr-08-20213 a<p>Strident lobsters of the Palinuridae family emit sounds in the presence of predators that can be used in the acoustic monitoring of such species. This study aims to identify sound emission and describe the structures of sound mechanism in red (Panulirus meripurpuratus) and green (Panulirus laevicauda) Brazilian spiny lobsters. The lobsters were collected in the environment, and recordings were performed in laboratory tanks with submerged hydrophones. The animals were stimulated to emit sound by the presence of an artificial octopus in the tank. The sounds emitted by the lobsters were analyzed by means of the waveform, and the structures involved (plectrum and file) were observed using scanning electron microscopy (SEM). Both species emitted a rasp sound composed of several pulses, with a rate varying from 125 to 265 pulses per second. The SEM showed that the file is similar between the species and it is covered by microscopic plates (shingles) measuring between 12.6 and 12.9 &mu;m of medial&ndash;lateral width and 6.2 &mu;m and 7.1 &mu;m of anteroposterior length. This analysis also revealed for the first time the presence of pores (&lt;&thinsp;1 &mu;m in diameter) with vestiges of cuticular setae in-between the shingles, which could be involved in the mechanosensory control of sound production in lobsters. The results of this study corroborate the morphological pattern of sound emission structure described for other lobsters of the genus Panulirus.</p>
10abioacoustics10aPanulirus10aRasp10astridulation1 aHamilton, Santiago1 aSilva, José, Filipe1 aPereira-Neves, Antonio1 aTravassos, Paulo1 aPeixoto, Silvio  uhttp://link.springer.com/10.1007/s00435-019-00461-503068nas a2200217   4500008004100000022001300041245008700054210006900141260001600210300001200226490000800238520221800246100002502464700002302489700002502512700001902537700002102556700002002577700002002597856023302617       2019                        eng d  a0044848600aAcoustic characterization of feeding activity of Litopenaeus vannamei in captivity0 aAcoustic characterization of feeding activity of Litopenaeus van  cJan-02-2019  a76 - 810 v5013 a<p>The aim of the present study was to evaluate the acoustic activity of Litopenaeus vannamei of different size classes during feeding in captivity, as well as describe the sound generation mechanism and main associated acoustic variables. The structure responsible for sound emission was identified based on simultaneous audio and video recordings during the consumption of feed pellets. Eighteen animals divided into three size classes (small: 13.03 &plusmn; 1.87 g; medium: 22.09 &plusmn; 2.20; large: 35.31 &plusmn; 3.20 g) were used for the acoustic characterization of feeding activity. The animals were fed three pellets (48 &plusmn; 4 mg) individually and offered in sequence. The recording of each pellet offered lasted 10 min, beginning with the point at which the animal took the pellet. The number of sound pulses (&ldquo;clicking&rdquo; sound) per pellet ingested was counted and related to food intake. L. vannamei emits sound during the feeding process, which is associated with the closing of the mandibles during the shredding of the food. The average values for the acoustic variables were a minimum frequency of 3.47 &plusmn; 0.32 kHz, maximum frequency of 37.75 &plusmn; 2.44 kHz, frequency peak of 11.1 &plusmn; 3.39 kHz, maximum energy of 83.55 &plusmn; 3.39 dB and sound duration of 4.7 &plusmn; 0.2 ms. No statistically significant differences in the acoustic variables were found among the different size classes or in the sequence of the pellets offered. The number of clicks per pellet ranged from 121 to 154 for all size classes. However, the number of clicks generated in the large class was significantly higher during the first minute after the capture of the pellets, dropping significantly after five minutes in comparison to the other size classes. The findings demonstrate that L. vannamei is acoustically active and the sounds generated can be used as an indication of feeding activity in captivity. The click rate per pellet or particular period of time, combined with the maximum energy generated at a specific frequency (frequency peak) can be used as an indication of the quantity of feed consumed by the animals.</p>
1 aSilva, José, Filipe1 aHamilton, Santiago1 aRocha, João, Victor1 aBorie, Alfredo1 aTravassos, Paulo1 aSoares, Roberta1 aPeixoto, Silvio  uhttps://linkinghub.elsevier.com/retrieve/pii/S0044848618320398https://api.elsevier.com/content/article/PII:S0044848618320398?httpAccept=text/xmlhttps://api.elsevier.com/content/article/PII:S0044848618320398?httpAccept=text/plain