Still scientific society believed that the whistles were the main sounds made by these mammals, and did not even know about the importance of using pulse-explosive sounds. Scientists of the Research Institute of Dolphins (Bottlenose Dolphin Research Institute BDRI), based on studies conducted in the waters of Sardinia (Italy), showed that these sounds are vital to public life, and vividly reflect their behavior.
“Pulse-blasting sounds are used in the life of a bottlenose to socialize and maintain their position in the social hierarchy to warn them from physical conflict, and this is also a significant energy savings,” said one of the leading researchers BDRI. The analysis, published by the publishing house Nova Science Publishers, in the book about dolphins: anatomy, behavior and risk, represents the most complete set of these pulse-explosive sounds and whistles collected through the use of bio acoustics since 2005 in the waters of Sardinia (Italy).
According to experts, the tonal sounds of whistles (the most melodic), allow dolphins to stay in contact with each other (over all mothers and offspring) and to coordinate hunting strategies. Pulse-blasting sounds (more complex and varied than the whistles) are used “to avoid physical aggression in situations of high arousal, such as when they are competing for the same food, for example,” the scientists explain.
According to the researchers, bottlenose dolphins emit more long-pulse explosive sounds while hunting and high aggression: “These sounds can be heard better than others and over a long period”, and enable each individual to maintain their position in the hierarchy. Dolphins emit these sharp sounds in the presence of other individuals bound to the same victim. “Least dominant” animal is removed away to avoid collision.
“The surprising fact of these sounds is that they have a high level of odnonapravlennoi, unlike human sounds. One Dolphin can send the sound to another, which he sees as a competitor, and he clearly understands that this sound was addressed it to him”, says a Spanish scientist.