Acoustic Communication in Delphinids

Delphinid communication has been shaped by the marine environment. This resulted in specific adaptations such as echolocation and a sophisticated communication system that allows animals to maintain contact over several kilometers even if no other cues are available. The communication system of delphinids is characterized by large call repertoires, recognition calls shaped by vocal learning, and a great plasticity of the vocal repertoire. Delphinids also display complex cognitive skills that influence how they use communication signals. Complex social systems provide opportunities to apply these skills. Most of our knowledge on delphinid communication comes from studies on bottlenose dolphins and killer whales. Future studies need to focus on additional species and try to assess the threat imposed by anthropogenic noise on the communication behavior of delphinids. © 2009 Elsevier Inc. All rights reserved.