The researchers then measured how the sound propagation in the algae-covered bottom and empty fields. To do this, the authors used a high frequency sound and sensitive hydrophones. The work was conducted in the waters of the Gulf of Mexico, near the city of Port Aransas.
The authors studied the propagation of acoustic waves in two frequency ranges: 100 kHz, which corresponds to the echolocation sounds of dolphins, and about 500 Hz, which corresponds to the sound signals the fish themselves.
The study found that the effectiveness of echolocation of algae is reduced by 88 percent. LF talks fish "jammed" is less significant, but given the particular sensitivity of the ear dolphins spread at about the same distance.
Dolphins like bats use for orientation in space high clicks. Recently, based on the behavior of marine mammals during the attack on schools of fish, scientists have assumed that the brain is capable of producing dolphins nonlinear mathematical calculations. According to biologists, this ability to explain why the dolphins are guided by echolocation in an environment filled with air bubbles.