News Finding: Noise levels in the world's oceans are on the rise and this new study found that dolphins are simplifying their calls to be heard over noise from recreational boats and other vessels in nearby shipping lanes 
Paper Finding: In addition to modifying the shape, dolphin whistles were also higher frequency during increased broadband and 2.5 kHz TOL ambient noise immediately prior to the call.
News Context: Noise levels in the world's oceans are on the rise and this new study found that dolphins are simplifying their calls to be heard over noise from recreational boats and other vessels in nearby shipping lanes 
Paper Context: The ambient noise environment could also affect vocal learning, as young animals exposed to elevated noise may hear adjusted calls from conspecifics . In addition to modifying the shape, dolphin whistles were also higher frequency during increased broadband and 2.5 kHz TOL ambient noise immediately prior to the call. Increased low-frequency ambient noise may be causing dolphins to change their vocalization behaviour to avoid or compensate for masking.