News Finding: For the algorithms in the data loggers to recognize the caller's species, however, the sound source had to be closer to the devices, an issue that would affect researchers working in areas with more than one echolocating species.
Paper Finding: 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).
News Context: The maximum distance a data logger captured the sounds was 566 meters (1,857 feet), though the average EDR among the data loggers was just under 200 meters (656 feet) for both real and artificial porpoise click signals. For the algorithms in the data loggers to recognize the caller's species, however, the sound source had to be closer to the devices, an issue that would affect researchers working in areas with more than one echolocating species. In this case, the algorithms' EDR for clicks correctly classified as porpoise sounds was just 72 meters (236 feet).
Paper Context: Increased noise in the 40 Hz, 400 Hz and 10 kHz TOLs also had significant effects on dolphin whistle characteristics (table 1) . 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.