A Whale’s Life – Screaming to Survive in Noisy Waters
By Julianna Calcagno
Marine Sanctuaries Program Intern – Summer, 2010
When was the last time you wanted a noisy leaf blower or a honking car alarm to stop blaring? Imagine thousands of similar sounds intruding into your daily life from breakfast through dinner time, and all through the night. This is what it’s like to be a whale in today’s noisy oceans. It’s called noise pollution. You and I may not notice it up here on land, but it is really bad for you if you are one of the animals that live in the vicinity of all the noise produced by humans on a daily basis in our oceans. The blue, grey, and humpback whales that swim and feed in the krill-rich waters of the Gulf of the Farallones National Marine Sanctuary are subject to dramatically increased background noise because of all the shipping traffic that drives through those waters on the way to the busy Port of Oakland, the 4th busiest port in the nation.
Now picture being at a concert and trying to hear something important that the person right next you is saying. Unless you have a hearing super power you would barely hear what the other person is saying. That is what the whales have to endure all the time. The noise that the ships make – mostly from their propellers – is at the same level, or frequency, that whales use to communicate with each other. In their darkened ocean world they can’t rely on sight, like humans can. Whales depend on sound to communicate through vast amounts of water, to find food, to mate, to survive, and protect themselves from predators.
Scientists recently discovered that some whales are changing their vocalizations – essentially screaming – so that they can be heard over the racket all the boats are making. But doing this is likely straining the whales and at some point they won’t be able to call loud enough to be heard in our industrialized ocean, leaving them silenced and alone.
If ships slowed down, though, they wouldn’t be spreading as much noise pollution, and they would save innocent whales that die each year after being struck and killed by fast-moving vessels.
Maersk, the world’s largest shipping line, is doing it! If they can slow their speed to 12 knots (about 14mph) – instead of the much noisier and dangerous 20 – 24 knots – then so should the rest of the shipping companies.
Try to picture having no way to communicate, protect yourself, or even be able to eat because of some body else who wants to be able to move faster to a destination. For whales’ sake, and cleaner air and less climate change, ships should give whales a brake!
Tags: Fisheries, Marine, marine sanctuaries, ocean noise, Shipping, Whales
