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Home›Fishing Industry›How oil spills harm birds, dolphins, sea lions and other wildlife

How oil spills harm birds, dolphins, sea lions and other wildlife

By Bridget Becker
October 5, 2021
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Ocean creatures that swim in deep water are less affected by spills. But oil disasters near the coasts often do the most harm to shorebirds and marine mammals that inhabit the ocean’s edge and on its surface.

“These critters live where the floating oil accumulates,” said environmentalist Sean Anderson, professor of environmental science at California State University Channel Islands, adding, “This oil is toxic to everything.”

Here’s a closer look at how certain species of marine life are affected by oil spills.

And if you’d like to help with wildlife rescue efforts in the aftermath of the spill, you can donate here.

Shore birds

Coastal birds can be particularly vulnerable as oil coats the ocean surface, where they feed, and spills onto beaches, fouling their nesting areas.

In California, this most commonly affects brown pelicans, grebes, gulls, cormorants, plovers, and other birds.

When birds cover themselves with oil, it makes their feathers useless to keep them insulated and warm. Birds also instinctively preen themselves to remove anything on their feathers, exposing them to ingesting toxic amounts of oil, Anderson says.

“The visuals are heartbreaking,” says Anderson. “Even a person who doesn’t know anything about biology can see how birds are affected.”

Oiled birds that return to their nests can also contaminate their eggs and chicks with oil.

dolphins

Bottlenose dolphins swim in the oily waters of Chandeleur Sound, Louisiana, in May 2010 after the Deepwater Horizon disaster.

Dolphins are migratory and will often swim to safer waters if they smell or taste the oil, Anderson says.

But the playful mammals have been sickened and killed by spills, which can spit toxic fumes from petroleum chemicals floating on the ocean surface. Two dolphins were found dead after an oil spill in May 2015 near Santa Barbara, California, according to the Center for Biological Diversity.

Whales

A humpback whale swims through an oil spill in Skjalfandi Bay, northern Iceland, in 2009.

Oil spills can also be fatal to blue whales, gray whales, humpback whales and other species. Exposure to toxic petroleum fumes was recognized to kill whales and dolphins even years later, according to the Center for Biological Diversity.

Sea lions

A young California sea lion is washed at SeaWorld San Diego's Wildlife Care Center in 2015 after an oil spill in Santa Barbara.

Unlike dolphins, sea lions are territorial and less likely to flee their coastal region, even if it is fouled with oil, Anderson explains.

This makes them more vulnerable to oil poisoning, which can seep into their mouths when they break the surface of the water to breathe.

Sea otters

A rescued sea otter is washed by workers at a pet store after the Exxon Valdez tanker disaster tainted the crystal-clear waters of Prince William Sound, Alaska in 1989.

The sea otter remains endangered after being targeted by hunters in the 1800s and early 1900s for its fur. The crowd-pleasing aquarium can be found in coastal Pacific waters, from Alaska to central California.

The oil can smooth the fur of otters, cause them to lose their insulation and die of hypothermia, in the same way oil harms birds.

sand crabs

Sand crabs, also known as mole crabs, are common on many beaches and are a key link in the food chain.  This one is on a beach in Trinidad.

These inch-sized creatures burrow in the sand where waves crash onto beaches, making them vulnerable when oil spills onto the shore.

“They are right to put themselves in danger,” says Anderson.

High concentrations of the oil kill adult crabs, while lower amounts can harm their babies and eggs. These invertebrates are a key part of our beach ecosystem because “everyone eats them,” says Anderson. “They are incredibly important for a range of species.”

Lobsters

An oil-covered lobster died after an oil spill off Refugio State Beach in May 2015 near Santa Barbara, California.
Trace amounts of oil in seawater can kill lobster larvae while they are still plankton floating in the water, according to the Gulf of Maine Research Institute.

As a result, an oil spill could potentially devastate an area’s lobsters – and its lobster fishing industry – five to seven years later, when those lobster larvae reach market size, according to the institute.

Fish species

A school of redfish swims near the base of an oil rig off Ventura, Calif., In 2003.

Some thicker oils sink to the bottom of the ocean, where they are ingested by rockfish, white croakers, and other species that feed in the depths of the ocean.

The oil won’t necessarily kill them, Anderson says, but toxins build up in their liver and other organs, making them unhealthy for humans to eat.


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