Scientists recently performed a groundbreaking test on a baleen whale to assess its hearing abilities. This controversial step is bringing scientists closer to understanding how the largest and most intelligent creatures on Earth perceive the world.
In 2023, researchers captured two young minke whales off the coast of Norway, attached electrodes to their skin using suction cups, and measured their brain waves while playing tones at various frequencies. The young whales were both over 12 feet long and weighed around one ton each.
The findings of the research, published in Science on Thursday, surprised whale researchers by suggesting that whales have the ability to hear much higher frequencies than previously thought, exceeding the hearing capabilities of most mammals, including humans.
Dorian Hauser, the study’s lead author and director of conservation biology at the National Marine Mammal Foundation, described the discovery as “a little shocking.” He explained that whales have ultrasonic hearing, likely to detect killer whales, their primary predators, as they hunt prey using echolocation signals in a similar frequency range.
The startling revelation comes at a time of increasing concern over the impact of ocean noise from sources like naval sonar, oil and gas exploration, and shipping traffic, which can alter marine mammal behavior, cause hearing loss, and even lead to death. This new information may lead to revising regulations under the Marine Mammal Protection Act and restricting certain activities.
Susan Parks, a biology professor at Syracuse University, stated, “High-frequency sound from ocean activities has not typically been considered a threat to baleen whales, but this may now need to be reevaluated,” as mentioned in the study.
The research concluded a longstanding disagreement in the whale research community. Previously, baleen whales were never captured for hearing tests due to safety concerns for both the whales and researchers, given their large size.
Certain scientists and activists opposed the four-year Minke Whale Hearing Project, fearing the whales could experience stress and even mortality during brief captivity. The project faced criticism, with organizations like Whale and Dolphin Conservation advocating against it in an open letter to the Norwegian government.
The hearing abilities of the largest whale species on Earth have long been a mystery due to the limitations of studying these massive creatures in captivity. However, through innovative methods like the Minke Whale Hearing Project, researchers are making strides in understanding how these animals experience the world through sound.
Brandon Southall, a scientist involved in developing standards for ocean sound exposure, believes that the research could influence future regulations to protect marine mammals from harmful underwater noise sources. He emphasized the importance of conducting such studies carefully and professionally to guide conservation efforts.
While the Minke Whale Hearing Project is currently on hold, researchers hope to continue the exploration of these fascinating creatures’ hearing abilities should further funding become available.
Source: www.nbcnews.com
