Graduate Thesis Or Dissertation
 

An investigation of the acoustic signature of the Dungeness crab (Cancer magister)

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  • The acoustic signals produced by the Dungeness crab (Cancer magister) were investigated. The signals were examined for duration times and frequency content. The signals were converted from analog to digital form, and the autocorrelation functions and the power density spectrums were determined. The signals produced by Dungeness and Japanese red rock crabs were found to last from 2. 8 to 30. 0 milliseconds. The frequencies contained in these signals ranged from 800 to 15000 hertz, the passband of the filter used in the signal recording process. The autocorrelation functions were found to possess either a decaying sinusoidal wave shape or a sinusoidal wave shape displaying a nodal and anti-nodal characteristic. Nodal and anti-nodal behavior was found in 65% of the male. Dungeness crab signals, and in 25% of the female Dungeness crab signals. The time period between nodes in the autocorrelation functions of signals produced by Dungeness crabs was generally found to be less than two milliseconds. The time period between nodes in autocorrelation functions of signals produced by a related species, the Japanese red rock crab, was generally found to be four milliseconds. The power contained in a signal was found to be concentrated in a narrow band of frequencies in a majority of the signals. The frequency containing the maximum power of the signal was found to be between 4000 hertz and 6000 hertz in 69% of the large Dungeness male signals. The Dungeness female signals contained maximum power frequencies in this range in only 35% of the signals, with a significant percentage, 30%, of the maximum power frequencies occurring below 2000 hertz.
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