We further propose a novel hypothesis that the bubble bursts are a hunting strategy used to disperse prey associated with floating vegetation mats and other forms of drifting materials used by fishes for shelter. We discuss each of these possibilities and conclude that Amazon river dolphin bubble burst behavior is most likely related to foraging or aggressive behavior because the behavior occurred in feeding areas and appeared to be directed at the drifting boat. Most are commonly associated with play, surprise, agonistic, and foraging behaviors. recorded sounds of pink river dolphins boto (inia geoffrensis) and other interesting underwater sounds during mamori sound-project organized by francisco. It is also much lower than that of the finless porpoise, another freshwater cetacean that occupies the Yangtze River. The frequency for the baiji’s click (about 60-110 kHz) is lower than that of the bottlenose dolphin (about 110-130 kHz). Though Indus River dolphins are very vocal, they use sounds for. Dominant whistle frequencies are around 5.8 kHz, with vocalizations lasting about 1 second. A review of the literature finds similar bubble production has been reported in at least 14 other species of cetaceans (4 mysticetes and 10 odontocetes). Indus River dolphins, Platanista minor, are found only in the Indus River in Pakistan.
Bubble bursts were disproportionately more likely to be present when fish sounds were also present, but it is not known if the association was due to predation or other factors. Bubble bursts were temporally clustered with an average interval of 169 s (0.1 to 1,187 s) between bursts. INTRODUCTION There are several studies characterizing echolocation signals of Amazon river dolphin or boto, Inia geoffrensis (de Blanville, 1817) (e.g., Penner and Murchison, 1970 Norris et al., 1972 Evans, 1973 Kamminga, 1979 Wiersma, 1982 Kamminga et al., 1993 Verfuss et al., 1997 ). Bubble burst sounds had a mean peak frequency of 402 Hz and duration of 8.9 s ( n = 51). The bubble production was classified as bubble bursts due to their similarity to bubble bursts produced by other cetaceans. They hunt by emitting ultrasonic sounds, which bounces off of fish and other prey, enabling them to see an image in their mind. Dolphins were observed to periodically produce large clouds of bubbles underneath or near the survey boat (averaging 7/survey or 8/h) as it drifted through areas of actively foraging dolphins. The Ganges river dolphin can only live in freshwater and is essentially blind.
Bubble sounds produced by the Amazon river dolphin ( Inia geoffrensis) were recorded incidentally as part of a survey of fish sounds in the Pacaya–Samiria National Reserve of Peru on six dates between 4 and 24 July 2012. Abstract: Acoustic characteristics of bubble production by an odontocete were documented for the first time.
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