This study tracks the development of acoustic communication, Imagine walking in the forest or walking in a zoo. Not the sound that fills the air, but the cry of random cricket. No singing birds, no roaring tigers, no talking monkey and no human voice.

Acoustic communication between vertebrates is a very familiar experience so it seems impossible to imagine the world sinking into silence.

In what may be the first study to track the development of acoustic communication between terrestrial vertebrates, scientists are now following the development of acoustic communication between terrestrial vertebrates 350 million years ago. Researchers have collected evolutionary trees for 1800 species that show the evolutionary relationships of mammals, birds, lizards and snakes, turtles, crocodiles and amphibians from 350 million years ago. now the new study tracks the development of acoustic communication.

They obtained data from scientific literature about the absence and existence of acoustic communication in any species extracted and plotted on trees.

Using statistical analysis tools, they test whether and when acoustic communication takes place independently of each other in different groups. is it related to nighttime activities; and whether it tends to survive in genealogy.

This makes sense intuitively, because sound transmission is advantageous when light is no longer available to display visual cues such as color samples, to intimidate competitors or to attract partners.

Based on the species in the sample, the authors estimate that more than two-thirds of terrestrial vertebrates have acoustic communication.

While some groups of animals easily come to mind because of their vocal talents, they consider birds, frogs and mammals to be crocodiles, and some turtles and turtles have the ability to voice.

Interestingly, the researchers found that even in lineages that switched to (active) daily lifestyle, the ability to communicate through noise was maintained.

The researcher explains: We have examples of acoustic communication that exist in groups of frogs and mammals that have become common even though frogs and mammals operated hundreds of millions of years ago overnight.

According to Wina, birds still use acoustic communication when they are mostly every day. Interestingly, many birds sing at dawn, as observers can observe.

Although speculative, this “early human” behavior can be a relic of the bird’s origins at night.

Research also shows that acoustic communication seems to be a very stable evolutionary trait.

To illustrate this finding, Vienna shows birds and crocodiles: both lines have acoustic communication and go back about 100 million years, but although nearly 10,000 species of birds are known, the list of crocodiles does not cross 25.

And although there are about 10,000 known species of lizards and snakes, most of them continue to live without noise, unlike about 6,000 species of mammals, 95% of which are voiced.

If you look at smaller scales like millions of years and certain groups such as frogs and birds, the idea that acoustic communication determines working specifications, the researchers say.

The authors point out that the results tend not only to be related to acoustic communication, but also to other evolutionary features caused by environmental conditions that are known to influence species evolution.

While ecology was previously thought to be important for signal development, it is believed that it mainly applies to subtle differences between closely related species, researchers say. We show here that the idea of ​​developing environmental signals has been applied to the most important types of signals for hundreds of millions of years, such as the ability to communicate acoustically or not.


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