June 6, 2012 17:58
Biologists from Australia and the United States presented recent data on social interactions in a population of bottlenose dolphins (bottlenose dolphins genus Tursiops), wrote "Kompyulenta."
The first article, which is to be published in the journal Biology Letters, is dedicated to male Tursiops. It has been established that male bottlenose dolphins are organized in groups of two or three individuals, who are guarding the female competitors from attacks — a so-called first-level union. Opponents, however, still persist in their attempts to "steal" the female, and in the battle pair or three males may be combined with other pairs and triples in the second-level unions.
Authors for six years observed dolphins in an area of 600 square kilometers at Peron Peninsula in Shark Bay, Australia. It was found that the most massive contractions cause animals to create even larger unions in the third level. This behavior, the researchers noticed that are unique to humans and dolphins, and chimpanzees, for example, says nothing of the sort.
"The explanation is very difficult because the males do not help to relatives, and their direct competitors," — said the head of Richard Connor of the University of Massachusetts. Perhaps the system is based on the belief that animals in the future relatives just help themselves.
In the second study, directed to the journal Proceedings of the National Academy of Sciences, discusses social interaction 52 females in Shark Bay. Here, biologists found the following pattern: up to the age of three more live pups female "friends" who also successfully guarded their young for three years after birth.