Bioacoustics

Bioacoustics is a cool science that mixes biology and sounds. It looks at how animals, including humans, make, send, and hear sound. Scientists study how animals create and detect these sounds and how the sounds move through different places.

This field helps us learn about the evolution of how animals make sounds. By studying these sounds, researchers can find out more about the animals that use them.

In underwater acoustics and fisheries acoustics, bioacoustics also checks how plants and animals change sound waves in water. This is important for using sonar technology to measure how much living stuff, or biomass, is in water. Some scientists also study vibrations on surfaces used by animals, called biotremology.

History

Humans have long used animal sounds to recognize and find animals. Bioacoustics became a science thanks to a Slovenian biologist named Ivan Regen. He studied insect sounds and even made a special device to play music with an insect. He discovered important facts about how insects hear.

Later, better tools like oscilloscopes and digital recorders helped scientists study animal sounds more accurately. Today, bioacoustics helps us learn how animals interact with sounds around them and how human noise affects them. It can also help estimate the variety of life in an area without harming it.

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Importance

In water, sunlight doesn’t go very deep, but sound can travel far. That’s why many sea animals use sound to talk to each other and find where things are, even though they can see well. Scientists have studied how dolphins and other sea animals use special sounds to “see” underwater.

A lot of this research started because the military wanted to understand how animal sounds might affect their own underwater tools. This helped scientists learn more about how different sea animals communicate and sense their world.

Main article: auditory

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Methods

Listening is an important way scientists study bioacoustics. By watching animal behavior and the sounds they make, researchers can learn about how animals create and understand sounds.

Bioacoustics also helps us learn about the sounds made by whole ecosystems. This area, called ecoacoustics, looks at how sounds from nature, like birds singing or rivers flowing, can tell us about the health of the environment. Scientists use special tools like hydrophones for underwater sounds, ultrasound detectors for high-frequency sounds, and computer programs to analyze these sounds. These methods help us understand more about animals and their habitats.

Main article: Hydroacoustics

Animal sounds

Animals use many sounds to talk to each other, and these sounds can be very different from what humans hear. For example, katydid crickets make sounds that are much higher than we can hear, while bats use special sounds to find their way in the dark. Some ocean animals, like a type of marine worm, can make very loud popping sounds. Other animals, like elephants, talk through vibrations in the ground that we might feel but not hear. Many animal sounds are sounds that humans can hear, between 20 and 20,000 Hz. The ways animals make and detect these sounds are very different.

Plant sounds

Between 2013 and 2016, scientist Monica Gagliano from the University of Western Australia studied the sounds made by plants. This helped grow the field of plant bioacoustics. Her work showed that plants can make sounds and taught us more about how they talk to each other using sound.