. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PISCINE NEUROBIOLOGY AND BEHAVIOR 243 duration, call duration, and number of pulses in a call (4. 5). Most importantly, these calls are associated with a stereotypical court- ship behavior (the "courtship dip") in which a male rises in the water column and rapidly swims downward while producing the loud call. It makes sense that, if these acoustic signals evolved to attract conspecific females from a distance, the sound patterns would be easily identifiable and consistent. Abudefduf sordidus is found on coral reefs

- Image ID: RHKM53
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PISCINE NEUROBIOLOGY AND BEHAVIOR 243 duration, call duration, and number of pulses in a call (4. 5). Most importantly, these calls are associated with a stereotypical court- ship behavior (the "courtship dip") in which a male rises in the water column and rapidly swims downward while producing the loud call. It makes sense that, if these acoustic signals evolved to attract conspecific females from a distance, the sound patterns would be easily identifiable and consistent. Abudefduf sordidus is found on coral reefs
Library Book Collection / Alamy Stock Photo
Image ID: RHKM53
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PISCINE NEUROBIOLOGY AND BEHAVIOR 243 duration, call duration, and number of pulses in a call (4. 5). Most importantly, these calls are associated with a stereotypical court- ship behavior (the "courtship dip") in which a male rises in the water column and rapidly swims downward while producing the loud call. It makes sense that, if these acoustic signals evolved to attract conspecific females from a distance, the sound patterns would be easily identifiable and consistent. Abudefduf sordidus is found on coral reefs throughout the Indo- west Pacific to Hawaii. This study was conducted at Johnston Atoll, using a specialized underwater video and hydrophone as- sembly (see methods in ref. 4). The hydrophone had a frequency range of 10 to 3000 Hz and sensitivity at 10 psi of -162 dBv/ /iPa ± 2 dB (model FishFone, BioAcoustics Inc. Woods Hole. Massachusetts). In general, about 40% of the total recording time on videotape was lost due to scuba bubble noise obscuring the signal sufficiently to affect the accuracy of measurements. Signals were digitized at 44 kHz (Canary Software. Cornell University. Ithaca. New York). Sonograms were produced using the following parameters: filter bandwidth 389.7 Hz. frame length 512 pts. FFT size 2048 pts, time grid resolution 5.805 ms, 50% overlap, fre- quency grid resolution 21.53 Hz, window function Hamming, amplitude logarithmic. The courtship and spawning behavior of four males was re- corded between March 1995 and June 1998 (total 3.5 h of record- ing), resulting in a data set of clear recordings of 53 CAS and four aggressive "pops" by three males. Of these, 40 recordings were from one male. The adult males and female fish in this study ranged in size from about 13 cm standard length, SL (160 g weight and age 7 years) to 15 cm SL (225 g weight and age 9 years) and produced more than 400,000 embryos in a nest (6. 7). The acoustic recordings from

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