Kuvert's Whale Whale, part of a massive breakthrough in 1996 in the Greek Cypriot Bay.
Credit: Alexandros Francis / Splashdowndirect / Shutterstock
The marine sonar is associated with massive whale penetration that has been otherwise healthy for almost two decades, but the precise mechanisms for influencing whales have been rejected by scientists. Now, the researchers explained the key details of how this non-smoker signal causes behavior in some death-ending whales.
Previously, autopsies of marshmallow whales from incidents of multiple incidents uncovered nitrogen bubbles in their tissues on the body, a sign of decompression sickness or "bends". This dangerous condition also affects divers when they grow too fast from deep water; it can cause pain, paralysis, and even death.
Whales are adapted for diving into the deep sea, and buns are recorders for the longest and deepest dives. But the new research explains how the sonar in certain frequencies disorientates and scares some whale whales so much that the experience prevails an important adaptation for deep diving: a slower heartbeat. Extreme fear accelerates the whale's heart, which can lead to decompression of the disease; the intense pain of this condition prevents the whales from getting stuck on the beaches and eventually dying, the scientists reported in a new study. [Whale Photos: Giants of the Deep]
Massive hooks of Kuwait kivu (Ziphius cavirostris) were almost unheard of before 1960, but this changed with the introduction of a mid-frequency active sonar (MFAS) in naval exercises in the open ocean. This kind of sonar, developed in the 1950s for the detection of a submarine, ranges from 4.5 to 5.5 kHz, according to the study. After the emergence of this sonar, the massive observation events soon rose for boots, with 121 such threads between 1960 and 2004, the researchers write.
The scientists first noticed the connection between the mass intake of whales and naval exercises using a sonar in the late 1980s, study author Jara Bernaldo de Chiros, a researcher at the Institute of Health and Food Safety at the University of Las Palmas de Gran Canaria in Spain , for Live Science in email.
That connection has intensified after similar offensive events in Greece in 1996 and in the Bahamas in 2000, De Quíros added. And in September 2002, when 14 whipped kites captured in the Canary Islands during a naval exercise by NATO, veterinary pathologists discovered lesions in animals that were "in line with decompression disease," De Kirous said.
Fight or flight
In 2017, biologists studying the kibbles gathered at the workshop to analyze the compilation findings of the past decades, seeing the massive appliances that were associated with nearby naval exercises using a sonar.
Between 2002 and 2014, six mass groups were held in Greece, the Canary Islands and Almeria in southeastern Spain, but dead whales did not appear to be malnourished or ill. However, they showed "abundant gas bubbles" through their veins, blood clots in multiple organs and "different weight" microscopic bleeds in the body tissues.
In kittens, a "fight or flight response" can be felt that exceeds the key diving adaptation: reducing the pulse, which reduces oxygen consumption and prevents nitrogen accumulation. The result was haemorrhages and "mass formation of bubbles in their tissues," explained de Quiros.
These symptoms of a decompression disease probably hit the whales after they were tormented by sound explosions, according to the study.
"The timing and spatial association with naval exercises using the sonar is very clear," De Quíros said in an e-mail. Moreover, behavioral studies have shown that whales that never meet sonar (or who are exposed to it only occasionally) usually show a stronger response than animals living near military ambitions, she added.
In 2004, Spain banned the sonar in the waters of the Canary Islands, the massive massive massif. Once the ban was passed, massive mergers did not take place, "proving the effectiveness of this mitigation," De Quíros said.
Based on their findings, the authors of the study recommend more widespread bans on military exercises using a syllable through the Mediterranean Sea, where atypical massive whale whales occur. Further research will determine the long-term impact of massive groups of populations of whale whales, authors write in the study.
The findings were published online today (January 30) in the journal Proceedings of the Royal Society B.
Originally published on Science Live.