***apologies for cross postings*** Regulators, decision makers, public affairs officers, industry representatives, other members of the international regulatory community, and others interested in underwater acoustics are invited to participate in the Discovery of Sound in the Sea (DOSITS) <http://www.dosits.org/> free, four-part webinar series described below. The webinar topics will include foundational science on sound reception and potential effects in marine mammals and fishes. Each webinar will last approximately 60 minutes and be comprised of one, focused presentation, followed by an extended period of facilitated discussion. Prior to each webinar, an outline of the webinar with links to background content on DOSITS will be made available. Participants are encouraged to review these outlines before the webinars. All webinars will be archived on the DOSITS website (Webinar Series for Regulators of Underwater Sound <https://dosits.org/decision-makers/webinar-series/webinars-2018/>). Full webinar summaries, questions asked, and their answers will be posted online after each webinar. The first two webinars of this four-part series will focus on topics related to marine mammals. The subsequent webinars will take place in fall 2018 and focus on fishes. Dr. Darlene Ketten will provide a review of sound reception in marine mammals on Tuesday, April 24, 2018, at 12:00pm ET Dr. Brandon Southall will provide a review of the potential effects of sound on marine mammals on Tuesday, May 1, 2018, at 12:00pm ET Interested individuals must register in advance for each webinar. To register please visit: http://eepurl.com/do0eqH <http://eepurl.com/do0eqH> To learn more about this webinar series or to view previous webinars or other, upcoming webinar dates and speakers, please visit the DOSITS webpage, Webinar Series for Regulators of Underwater Sound <https://dosits.org/decision-makers/webinar-series/webinars-2018/>. Associated webinars and their resources were conducted in 2015 and 2016 webinars and have been archived here <https://dosits.org/decision-makers/webinar-series/webinar-archive-2015-16/>. Questions? Please contact Holly Morin at holly_morin@uri.edu. Discovery of Sound in the Sea (DOSITS; www.dosits.org) is a comprehensive, educational website on underwater sound, designed to provide accurate scientific information at levels appropriate for all audiences, including decision-makers.