steps stepsa break or irregular change in frequency of a whistle. Related Articles: DOSITS VideosAirgun TechnologyPygmy Blue WhaleHow is sound used to estimate marine mammal abundance?Determine if a Sound Affects a Marine Animal Tutorial IntroductionHow did odontocete hearing evolve?Tutorial: How do you determine if a sound affects a marine animal?DOSITS Webinar Testing and Troubleshooting TipsRough-toothed dolphin Chris Knowlton2017-09-26T10:07:48-05:00