September 12, 2024 — New research shows that vessel noise—the rumble and churn of boats and ships—disrupts killer whales’ ability to find and capture food. This can have serious consequences for these whales, especially considering the challenges they already face. The findings were published recently in the scientific journal, Global Change Biology.
How Killer Whales Hunt and Why Noise Matters
Killer whales are sophisticated hunters. They use echolocation, a kind of biological sonar. They emit clicks that bounce off objects, creating echoes that help them “see” with sound. These echoes they receive back are crucial for finding prey, especially fast-moving salmon. The underwater noise made by vessels can be particularly disruptive for animals like killer whales, which rely heavily on sound to accomplish important activities like hunting.
Researchers wanted to know how vessel noise interferes with killer whales’ foraging success. So, they attached special tags to killer whales that recorded their movements and the sounds they made and heard. By comparing these data to noise levels, they could see a clear connection. As the noise from vessels increased, the whales’ foraging success decreased. They spent more time searching for prey, but with less success.