The role of acoustic signals in fish courtiship and challenges in bio-acoustic fish research.

Show simple item record Mosharo, K 2018-08-13T16:41:54Z 2018-08-13T16:41:54Z 2003
dc.description.abstract Sound production is a widespread p. enoi eno , in fishes; however, the importance of acoustic signals and ‘ heir po tential to influence reproduction has not been determined. This dissertation examines fish acoustic courtship signals to investigate whether sound has a ro e i. rep. od> _cive success. The pre-spawning sounds of several fishes were recorded a, . analyzed. The male advertisement call of two species of Belizean toadti. h, S nopus astrifer and Batrachoides gilberti, were found to significantly differ. These data, coupled with data in the literature suggest an influence of habitat characteristics on the calling behavior of toadfishes. Additionally, acoustic playback experiments were employed to investigate the role of male courtship sounds in the Malawi cichlid species, Tramitichromis intermedius. Playback results indicated that male sounds may initiate egg-laying behavior in females, but may not be behaviorally relevant v to conspecific males. A discussion of confounding factors in aquarium playback experiments is presented. Technical aspects of fish sound recording, playback, and analysis were also examined to provide information for future fish bioacoustics studies. It was determined that digital cameras are a useful method of recording fish sounds to describe metric characteristics; however, temporal parameters are more accurately captured by hydrophones, which are optimal for use in scientific description of fish sounds. Underwater speakers commonly used in fish playback experiments were tested for fidelity when producing a low-frequency pulsed fish sound. The Electro-Voice UW30 speaker was found to perform the best p. rybac. at low sound pressure levels (< 120 dB re 1 pPa) and at short distances (< 15 cm). The Clark Synthesis AQ339 speaker performed the best playback a^ ugher sound pressure levels (>120 dB re 1 pPa) and at greater distances than the UW30. Many fish sounds have been described in the literature; ho- ever, here ^ no standardization of sample size used in species descriptions. A method is presented that can be used to estimate the level of inclusiveness of sound variability in sound descriptions, and to approximate sufficient sample sizes of recordings. The courtship calls of Dascyllus albisella and Batrachoides gilberti were examined to illustrate this method and to provide a benchmark for future sound descriptions. vi en_US
dc.language.iso en en_US
dc.publisher Mich igan State University, en_US
dc.subject acoustic signal en_US
dc.subject bioacoustic en_US
dc.subject fish en_US
dc.title The role of acoustic signals in fish courtiship and challenges in bio-acoustic fish research. en_US
dc.type Thesis en_US

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