テッポウエビ類の発音計数による浅海域生物生息環境計測器の開発に関する研究

概要

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It has already been revealed that by merely measuring the number of pulse sounds emitted by snapping shrimps together with water temperature, it was possible to monitor the living organism's habitation condition in a shallow sea bottom. The measurement itself was very simple : just hold a hydrophone two minutes over the bottom of the sea and record the underwater sound. However, since a lot of work was required to remove noise before counting the pulse, to complete a measurement in the field was very difficult. The objective of the study is to develop a measuring device with which anyone can use this method in the field. To accomplish the objective, we develop a procedure to adjust a recording level based on the on site calibration, and develop equations to evaluate a normalized pulse count and its reliable range. Based on these results, we develop a pulse measuring software for a mobile computer which is equipped with a hydrophone on its sound input port. The new system enables us to measure the pulse number simply and quickly.
2004-12-15