Can Whales and Dolphins Adapt to Oily Gulf?
(麻豆淫院Org.com) -- The dead sperm whale found this week in the Gulf of Mexico puts the spotlight on how the BP oil spill will affect this endangered mammal, along with other cetaceans, such as dolphins, that must break the oil-slicked surface to breathe.
鈥淭hese communities of whales and dolphins are already known to be stressed, because they鈥檙e dealing with other pollutants, like heavy metals, in the water,鈥� says Emory neuroscientist Lori Marino, an expert in whale and dolphin intelligence and behaviors. 鈥淭hey are already compromised animals, and when they have something like this to deal with, it can be a tipping point for them.鈥�
It is unknown whether the deaths of the young sperm whale and the half-dozen dolphins that have been found washed up on Gulf beaches are oil related. Unlike the stark visual evidence of birds with oil-coated feathers, the toxic impact on whales and dolphins is primarily internal.
鈥淭hey have to open their blowholes to breathe,鈥� Marino says. 鈥淚magine sticking your nose in a bowl and snorting oil. You鈥檇 be choking.鈥�
A greater, and more lasting, impact may be the domino effect of toxins in the food chain, as oil droplets get into the fish and squid that cetaceans eat, she says.
Recent reports of large numbers of dolphins moving into shallow waters off Florida to flee the oil are troubling, Marino adds. 鈥淚f they stay in the shallows and the oil comes in after them, they鈥檒l be trapped.鈥�
Provided by Emory University
