A camera attached to a helium balloon provides an incredible vantage point to observe the dolphins. Their appearance is much like the Boto and Bolivian River Dolphins with a … are also less active, have smaller eyes and poor vision due to the fact The pitch of calls was also unique, falling in between the high-frequency clicks and whistles of toothed whales and dolphins, and the low-frequency calls of baleen species. leaves fresh water in the winter and moves to the coastal waters along In addition, the acoustic communication behaviour of other genera of river dolphins need to be studied. [5][6][7], This species is most closely related to the Amazon river dolphin (Inia geoffrensis), from which it is believed to have split about 2.08 million years (Ma) ago, on the basis of mitochondrial DNA sequence comparisons. They have a longer snout- sometimes up to 2 feet long! “There are a lot of obstacles like flooded forests and vegetation in their habitat, so this signal could have evolved to avoid echoes from vegetation and improve the communication range of mothers and their calves,” she says. Your email address will not be published. Instituto Araguaia has tested several methods to study these dolphins since the species was first described in January 2014, by INPA and University of Dundee. Sounds were categorised according to duration and the presence of non-linear phenomena such as subharmonics or biphonation. their way and to find their food. A rare river dolphin thought to be solitary and mostly silent has been revealed to make hundreds of sounds, raising questions about the evolution of communication in marine mammals. Instituto Araguaia has tested several methods to study these dolphins since the species was first described in January 2014, by INPA and University of Dundee. This truly fascinating species of mammal only received recognition as a separate species from the Amazon River Dolphin in 2014. [7][non-primary source needed] As a consequence, strong linear erosion has produced thousand of gullies just in the upper Araguaia basin, and the river mainstem suffered strong sedimentation and fluvial metamorphism (changes in its channel pattern). [6] From 1972 to 1974 this region was the scene of a conflict between left-wing guerrilla movements and forces supporting the then military dictatorship. This also made the magnificent creature the first new species of river dolphin recognized since 1918. “We found that they do interact socially and are making more sounds than previously thought,” she says. Underwater recordings were taken at the same time as video footage, resulting in 15.7 hours of acoustic material. These acoustic complexities are thought to carry information on group identity and maintaining social cohesion, and even an individual’s identity or emotional state. Other important tributaries include the Bonito, Garcas, Tapirape and the Formoso or Cristalino on the west, and the Pitombas, Claro, Vermelho, Tucupa and Chavante on the east.[5]. The truly remarkable Araguaian River Dolphin represents a newly discovered species of river dolphin. Information such as sex, age and natural marks on the dorsal and ventral parts of the body were recorded, as well as specific behaviours. The additional knowledge and images generated by this project will greatly strengthen our ability to do so. [8][non-primary source needed], Deforestation and Impacts on the Araguaia, South Amazon Ecotones Ecological Corridor, Food and Agriculture Organization of the United Nations, https://en.wikipedia.org/w/index.php?title=Araguaia_River&oldid=970703864, Wikipedia articles incorporating a citation from the 1911 Encyclopaedia Britannica with Wikisource reference, Wikipedia articles incorporating text from the 1911 Encyclopædia Britannica, Articles containing Portuguese-language text, Articles to be expanded from November 2011, Wikipedia articles needing factual verification from July 2020, Creative Commons Attribution-ShareAlike License, This page was last edited on 1 August 2020, at 22:17. Shooting is common, but around protected areas like Cantão, where the sound of a gun might attract park rangers, some fishermen have taken to putting out poisoned bait for dolphins. All whistles and pulsed calls were selected for further examination using a program called ARTwarp. "Araguaia" means "River of the macaws" in the native Tupi language. [8], "Brazil dolphin is first new river species since 1918", "A New Species of River Dolphin from Brazil or: How Little Do We Know Our Biodiversity", "List of Marine Mammal Species & Subspecies", "Animal Info - Boto (Amazon river dolphin)", https://en.wikipedia.org/w/index.php?title=Araguaian_river_dolphin&oldid=963483751, Creative Commons Attribution-ShareAlike License, This page was last edited on 20 June 2020, at 01:20.
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