Certain marine mammal organisms. For example, most toothed whales have an echolocation function. Dolphins can emit short calls that last tens of microseconds and have a frequency greater than 100 kilohertz. The appearance of this sound is related to special air chambers located in the nasal passages. The frontal crest on the dolphin's head acts as an acoustic lens, transforming received sound waves into a narrow sound beam. The dolphin determines the direction and distance of the object based on the reflection of its own call from the object in the water. . The frequency of repeated calls made by dolphins increases as the distance to the target decreases, so this sound detection can be used to detect the mystery of sounds.
The role of vocalizations in life marine
Under the sea, there are often all kinds of wonderful sounds. In addition to the roar of the waves, the sound ofcrashing gues and noise caused by underwater earthquakes and volcanic activities, whenever the wind and clouds change, the weather is abnormal or a storm approaches, waves of moaning Rhythmic sounds can also be heard on many islands. The moaning came from the depths of the ocean, like rolling thunder, up and down, in an orderly manner. Some say it is like the howling of sea pigs, while others say it is the sound of an alarm that is dipped in the sea to detect currents.
The famous American biologist Dr. Roger Payne and his wife Katie were conducting an investigation in the waters of the Bermuda Islands in the Atlantic Ocean aboard a small boat. When night fell, I suddenly heard bursts of beautiful singing coming from the depths of the ocean through the hydrophone. They had a distinct rhythm, cadences, repetitionsalternating ions, and were very regular, lasting up to 30 minutes. This particular song sparked the interest and enthusiasm of the Paynes and many biologists for exploration. In order to uncover this mystery, they dove into the depths of the ocean one after the other.
After much exploration, it was discovered that it was the humpback whale that was singing. Every time it swims to its breeding site in tropical waters in winter, it happily sings this moving love song. The singers are all male, and these songs change every year. Humpback whales living in different sea areas sing different songs, but the structure and changing rules of musical scores are the same, showing that the "composition" ability of humpback whales is hereditary.
In fact, many marine fish have the ability to make sounds, which is also necessaryre to the survival of fish. The drum fish makes a drumming sound to scare away enemies; the toad fish makes a distant flute sound to find a mate. Among the sounds made by fish are gurgling, buzzing, coughing, whistling, screaming, gnashing of teeth, scratching, drumming, etc. According to the analyzes of some scientists, fish noises are often caused by the vibration of the swim bladder and the friction of various parts of the bones. The purpose of these sounds is primarily to warn others of their kind that danger is approaching. Of course, people still don't know much about the meaning of fish pronunciation, and it is impossible to fully judge whether their pronunciation conveys a certain message, but the use of fish pronunciation in naval battles has been known for a long time.
In addition to the simple sounds ofe mechanical friction, there is another type of sound emitted by fish. The sound associated with its behavioral characteristics is called “biological sound”. There are more types of fish capable of emitting “biological sounds” in tropical seas than in high-latitude seas. Their functions vary: when some species are stimulated or attacked, they emit obvious warning sounds, frightening sounds, or escape sounds; Some nesting fish often use their fins to make squeaking sounds to scare off enemies. Some species make sounds while protecting their eggs; Several species of trevally on the Atlantic coast of the United States make the loudest sounds from 9:00 p.m. in the evening until 2:00 p.m. the next day, which is also the peak feeding time. Therefore, their vocalizations appear to be linked to maintaining contact between individuals in the baitfish school. Of noMany species often make sounds in conjunction with their breeding and mating behaviors, and in most cases, male fish make louder noises than female fish, such as several species of cod, seahorses, and gobies. .