Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.12/2448
Título: Development of vocalization, auditory sensitivity and acoustic communication in the Lusitanian toadfish Halobatrachus didactylus
Autor: Vasconcelos, Raquel Ornelas
Ladich, Friedrich
Palavras-chave: Ontogeny
Sound spectra
Hearing
Auditory evoked potential
Acoustic communication
Halobatrachus didactylus
Data: 2008
Editora: Company of Biologists Ltd
Citação: Journal of Experimental Biology, 211, 502-509
Resumo: The ontogenetic development of acoustic communication has so far only been investigated in one fish species. In order to determine whether detectability of conspecific sounds changes during growth in a species with limited hearing abilities (generalist), we investigated the development of auditory sensitivity and agonistic vocalizations in the Lusitanian toadfish Halobatrachus didactylus. Agonistic grunts were recorded, their sound pressure levels determined, and auditory sensitivities measured in five different size groups ranging from 3 to 32·cm standard length. Hearing thresholds were obtained using the auditory evoked potentials (AEP) recording technique. Dominant frequency, sound duration and number of pulses decreased, whereas pulse period and sound level increased with increasing fish size. The best hearing was below 300·Hz in all groups. Lower hearing sensitivity was found in the smallest juveniles at 100·Hz as well as at higher frequencies (800 and 1000·Hz). Comparisons between audiograms and sound spectra within the same-sized fish revealed that smaller juveniles would be barely able to detect agonistic grunts, while these vocalizations were clearly perceived by larger fish. In the latter, the main energy of sounds was found at the most sensitive frequencies. This study demonstrates that acoustic communication in the Lusitanian toadfish might be absent in early developmental stages and seems to start when juveniles are able to generate grunts of higher sound level and lower dominant frequency.
Peer review: yes
URI: http://hdl.handle.net/10400.12/2448
ISSN: 0022-0949
Aparece nas colecções:UIE-E - Artigos em revistas internacionais

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