L.A. Unleashed

All things animal in Southern
California and beyond

« Previous Post | L.A. Unleashed Home | Next Post »

New study suggests whales are suffering from sunburn

Blue Whale skin

Scientists say some whale species off the Mexican coast are showing signs of severe sunburn that may be caused by the damaged ozone layer's decreased ability to block ultraviolet radiation.

The seagoing mammals would be particularly vulnerable to the sun damage in part because they need to spend extended periods of time on the ocean's surface to breathe, socialize, and feed their young. Since they don't have fur or feathers, that effectively means they sunbathe naked.

As Laura Martinez-Levasseur, the study's lead author, put it: "Humans can put on clothes or sunglasses -- whales can't."

Martinez-Levasseur, who works at Zoological Society of London, spent three years studying whales in the Gulf of California, the teeming body of water that separates Baja California from the Mexican mainland.

Photographs were taken of the whales to chart any visible damage, and small samples -- taken with a crossbow-fired dart -- were collected to examine the state of their skin cells.

Her study, published in the Proceedings of the Royal Society B, seemed to confirm suspicions first raised by one of her whale-watching colleagues: The beasts were showing lesions associated with sun damage, and many of their skin samples revealed patterns of dead cells associated with exposure to the powerful ultraviolet radiation emitted by the sun.

As with humans, the lighter-skinned whales seemed to have the most difficulty dealing with the sun. Blue whales had more severe skin damage than their darker-skinned counterparts, fin whales and sperm whales, even though the latter spend bigger chunks of time at the surface.

The study said the findings highlight the possible perils associated with the depletion of the ozone layer, which helps insulate the Earth from ultraviolet rays.

That protective layer has been thinning for years under the influence of ozone-eating chemicals known as CFCs. While the emission of those chemicals has since largely been controlled, the extent to which the ozone is recovering is still under debate.

For whales, the potential danger from the sun's rays is just one more environmental stress. All species tracked in this study are considered endangered or vulnerable by the International Union for Conservation of Nature. If it's shown that the skin damage is leading to cancer, then "this could be a serious threat," according to Simon Ingram, who teaches marine conservation at England's University of Plymouth and wasn't involved with the study.

So far, there were no indications of skin cancer among the whales studied, although Martinez-Levasseur noted that only tiny samples were taken of the massive animals.

She said one of her next projects will be to examine how well whales' cells hold up under the increased ultraviolet radiation -- and whether whales' pigmentation darkens as a result of their time spent out in the sun.

In other words, she wants "to be able to see if they're tanning."

Scientists from Queen Mary, University of London, and the Cetacean Ecology Laboratory in Mexico also contributed to the study.

Humpback whale's unusual migration is believed to be a record-breaker
Researchers find 'shocking' levels of metal contaminants in the bodies of sperm whales

-- Raphael G. Satter, Associated Press

Photo: The blistered skin of a blue whale in the Gulf of California in an undated photo provided by the Zoological Society of London. Credit: Diane Gendron / Associated Press

Comments () | Archives (4)

The comments to this entry are closed.

Where did these scientist get the funding to do this ridiculous study. Typical liberal agenda. Next thing we will see is to develop device so that these whales will get less sun. These creatures have survived on earth for thousands of years without human interference. It is time for these scientist to let the nature take care of it's problem by itself.

Oh, puleeze!

Are they saying this is new, or has it been happening for a long time?

maybe if people were not so full of themselves and kept better care of this earth the whales would have no problem. Seeing as how we can't i applaud them for trying to save such a sacred creature.


Recommended on Facebook


In Case You Missed It...


Pet Adoption Resources

Recent Posts