The equipment led by the collaborator of the CRAM and investigator of L' Oceanogràfic of Valencia, Manolo Castellote, has discovered that the population of belugas that lives in Disenchantment Bay (Alaska) governs its patterns of conduct according to the state of tides. The study was made in May of 2008 and was possible thanks to device EAR (Ecologic Acoustic Recorder), facilitated by the CRAM, that also allowed the analysis of noise in habitat of the bay and to determine that the numerous cruises that circulate around the zone to visit the well-known glacier of Hubbard they do not affect the life of these cetaceans.

The detections of belugas made through recordings of EAR and other machines of bioacústica in Disenchantment Bay allowed investigators to determine for the first time a greater presence of these cetaceans during the periods of high water and very little or no in the low tide.

In order to make the study, the five devices of recording were located geographically in different positions from a very appropriate bay for tests of acoustic detection. That is because this bay receives a population of about 12 very isolated exemplary of beluga very different genetically and geographically. On the other hand, the machines of bioacústica were programmed to detect frequencies of 30 to 113 kilohercios; rank that already had been made a will previously with belugas in captivity.

The number of click of beluga per hour registered during 10 days confirmed the continuous presence of these animals in the study area during the period of anchorage of the scientific boat; nevertheless, a temporary analysis of the results misestimated any relation with the solar cycle and aimed directly at the evolution of the tides.

On the other hand, to analyze the affectation of belugas by the noise coming from boats, the equipment of Castellote located the EAR and other two devices of recording in Beluga Bay, near Hubbard, the greater glacier of North America and pole of attraction of numerous visitors.