A blue whale can communicate with another whale swimming up to hundreds of miles away. This is because it can travel a large distance.
The scientists have no idea why the frequency of whale calls are lower today than they were just twenty years ago. The “overtone” portion of the call is missed when the scientists have recorded baleen whale sounds in the North Atlantic. In fact, scientists are dumbfounded again.
In science reports, there is a new research suggests that the whales are choosing to do this – and that human activity is probably to blame.
Before now, it was believed a resonating sound in the chambers of the animal’s upper respiratory system generates the whale’s call.
If this is true, then the frequency would depend entirely on the size of the whale – the bigger the whale, the lower the frequency of its call. This theory is wrong as the researchers at Oregan State University’s Hatfield Marine Center have proved.
First, they recorded a blue whale’s call, then they built a model to try and mimic the sound.
In a statement, Robert Dziak, lead author and acoustics scientist with the National Oceanic and Atmospheric Administration (NOAA) says that they tried to envision a mechanism.
Whereby whales could gradually lower the frequency of their calls through time, or produce calls with unusual harmonic structure, by only resonating sound in their upper respiratory chamber – and it was physically impossible.
Dziak adds that the change in the frequency might be cognitive they are choosing to make it higher or lower in response to some sort of environmental stimulus.
the reason behind the frequency change
But the frequency change because it’s a response to an increase in human generated sound. With less static, whales are changing the frequency of their call to a radio channel.
This could, also, be because there are many blue whales more than those that were a couple of decades ago. Don’t be shocked they’re still listed as endangered animals.
It’s important to be mentioned here that a new research also shows thirty years after the hunting ban, they’re not recovering as fast as thought.
Dziak mentions that Lower-frequency sounds can be produced at lower intensity by the animal than high-frequency sounds and yet low-frequency sound still travels further.
The vocalization changes may be affected over the past two decades because of those factors.