Swim bladder morphology in chaetodontid butterflyfishes with a discussion of its bioacoustic significance

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Description: The swim bladder evolved in bony fishes as a respiratory organ, and in teleosts its role shifted to buoyancy control. Among teleosts, the swim bladder is also an accessory auditory organ that acts as a pressure-to-displacement transducer, enhancing the sensitivity of the ear to sound pressure waves. Many fishes have evolved specializations of the swim bladder that bring it closer to the ear (otophysic connection) and enhance hearing. In butterflyfishes of the genus Chaetodon , swim bladder horns either approach or contact the lateral line canal in the supracleithrum forming a laterophysic connection (LC). Webb (1998) identified two types of LC (direct and indirect) among Chaetodon spp., which are correlated with swim bladder morphology. She hypothesized that the LC allows the lateral line system to detect propagated sound pressure waves transmitted by the swim bladder. In an effort to understand the function of the swim bladder with reference to the LC, swim bladder morphology was investigated using traditional dissection techniques, histology, and computerized x-ray tomography (CT). (Abstract shortened by UMI.)
Language: English
Format: Degree Work