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 #sciencenews 
Paper Finding: The dolphin whistles had a less complex contour shape during increased ambient noise in the 2.5 and 20 kHz TOLs.
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 #sciencenews 
Paper Context: Over the entire deployment period, relatively high ambient noise levels were mainly caused by vessel noise and were above 120 dB re 1 mPa 11% of the time (electronic supplementary material, figures S4 and S5). The dolphin whistles had a less complex contour shape during increased ambient noise in the 2.5 and 20 kHz TOLs. Since these frequencies are outside the mean range of the whistles, this suggests that the signaller responded by modifying the call as opposed to the received call losing components through masking.