Table 2 Summary of the study effort for each species and each basin. For the Mediterranean, we analyzed 22.47 h of recordings from 38 sightings and we extracted 1293 whistles, 58.54% of which met good quality criteria and were analyzed. For the Atlantic Ocean, we collected 17.25 h of recordings during 63 sightings and 45.70% of 3177 signals were analyzed

From: Dolphin whistles can be useful tools in identifying units of conservation