Mutant butterflies a result of Fukushima nuclear disaster, researchers say
This image from a study on Fukushima's impact on butterflies shows wings mutated by the radiation.
August 14th, 2012
10:35 AM ET

Mutant butterflies a result of Fukushima nuclear disaster, researchers say

In the first sign that the Fukushima nuclear disaster may be changing life around it, scientists say they've found mutant butterflies.

Some of the butterflies had abnormalities in their legs, antennae, and abdomens, and dents in their eyes, according to the study published in Scientific Reports, an online journal from the team behind Nature. Researchers also found that some affected butterflies had broken or wrinkled wings, changes in wing size, color pattern changes, and spots disappearing or increasing on the butterflies.

The study began two months after an earthquake and tsunami devastated swaths of northeastern Japan in March 2011, triggering a nuclear disaster. The Fukushima Daiichi plant spewed radiation and displaced tens of thousands of residents from the surrounding area in the worst nuclear accident since the 1986 Chernobyl disaster in Ukraine.

In May 2011, researchers collected more than 100 pale grass blue butterflies in and around the Fukushima prefecture and found that 12% of them had abnormalities or mutations. When those butterflies mated, the rate of mutations in the offspring rose to 18%, according to the study, which added that some died before reaching adulthood. When the offspring mated with healthy butterflies that weren't affected by the nuclear crisis, the abnormality rate rose to 34%, indicating that the mutations were being passed on through genes to offspring at high rates even when one of the parent butterflies was healthy.

The scientists wanted to find out how things stood after a longer amount of time and again collected more than 200 butterflies last September. Twenty-eight percent of the butterflies showed abnormalities, but the rate of mutated offspring jumped to 52%, according to researchers. The study indicated that second-generation butterflies, the ones collected in September, likely saw higher numbers of mutations because they were exposed to the radiation either as larvae or earlier than adult butterflies first collected.

To make sure that the nuclear disaster was in fact the cause of the mutations, researchers collected butterflies that had not been affected by radiation and gave them low-dose exposures of radiation and found similar results.

"We conclude that artificial radionuclides from the Fukushima Nuclear Power Plant caused physiological and genetic damage to this species," the study said.

The results of the study bring up concerns about the larger impact of the Fukushima disaster and the impact it will have on the ecosystem in Japan and nearby areas, as well as what we can learn for future nuclear disasters.

"Our results are consistent with the previous field studies that showed that butterfly populations are highly sensitive to artificial radionuclide contamination in Chernobyl and Fukushima," the study said. "Together, the present study indicates that the pale grass blue butterfly is probably one of the best indicator species for radionuclide contamination in Japan."

One of the researchers, Joji Otaki, an associate professor at the University of the Ryukyus in Okinawa, told reporters that while butterflies may be the best indicator, the study should also lead to more research on what else may be affected by the radiation.

"Sensitivity (to irradiation) varies between species, so research should be conducted on other animals," Otaki told the Japan Times.

Otaki said while there is still plenty of research to be done on radiation, there shouldn't be large-scale concern about this kind of mutation in humans.

"Humans are totally different from butterflies and they should be far more resistant" to radiation, he told the newspaper.

Read more:

Inside Fukushima's meltdown zone

What Fukushima did to the ocean

Gallery: Then and now

Post by:
Filed under: 2011 tsunami • Animals • Insects • Japan
soundoff (316 Responses)
  1. Whoa Baby

    Nutty planet. Don't park your camper overnight at the former Nuke testing grounds in Nevada- strange people
    lurking around at night.

    August 14, 2012 at 12:18 pm | Report abuse |
  2. latterette

    one word. mothra

    August 14, 2012 at 12:21 pm | Report abuse |
    • marsmotel

      how ironic that would be!

      August 14, 2012 at 12:25 pm | Report abuse |
  3. I am the Walrus

    It means Pedometer Bear. It. Counts how many steps he walks. Get your mind outta the gutter. Yeesh!

    August 14, 2012 at 12:24 pm | Report abuse |
    • banasy©

      Hi, weezer.
      It's a name he uses to needle someone on here.
      Take from that what you will..

      August 14, 2012 at 1:21 pm | Report abuse |
  4. rad666

    Who writes and article like this and doesn't provide pictures

    August 14, 2012 at 12:31 pm | Report abuse |
  5. Jimijoni


    August 14, 2012 at 12:34 pm | Report abuse |
  6. mytictac

    Makes you wonder what the people will begin to look like?!

    August 14, 2012 at 12:40 pm | Report abuse |
  7. oldman100

    evolution is amazing!

    August 14, 2012 at 12:46 pm | Report abuse |
  8. ted

    not one picture ,that sucks cnn.

    August 14, 2012 at 12:47 pm | Report abuse |
  9. BG

    Really? In just a few months? What drivel

    August 14, 2012 at 12:53 pm | Report abuse |
  10. Just Sayin'

    I, for one, welcome our new butterfly overlords.

    August 14, 2012 at 12:54 pm | Report abuse |
  11. Krandal

    Send in Chris Hansen.

    August 14, 2012 at 12:56 pm | Report abuse |
  12. Shuffler

    You can't take thier pictures...... they are Ninja.

    August 14, 2012 at 12:58 pm | Report abuse |
  13. cdogg

    This story would be more believable with pictures

    August 14, 2012 at 12:59 pm | Report abuse |
  14. Doc

    Easy there, weezer. You can't be sure that's what his screen name means, and unless you've been on his machine, you really don't know what he's downloaded. Hopefully that;'s not what his screen name means. If it is, I guess he'll have to answer for that someday, somewhere. And just or the sake of argument (understanding I'm talking to an internet flamer who doesn't have to think before he or she posts), let's go with the premise of innocent until proven guilty, OK?

    The good news for you is that erasing such material isn't good enough. A forensic examination of the drive would reveal such artifacts unless the drive were completely overwritten or destroyed (hammer time).

    August 14, 2012 at 1:00 pm | Report abuse |
    • Bob Dole

      Or, it could be that he/she is just a troll looking for a reaction from everyone by using a "controversial" screen name.

      August 14, 2012 at 2:33 pm | Report abuse |
  15. Eat mor chik'n

    Mutant butterflies, eh? Sure they're not killer mutant zombie butterflies?

    Something like that is supposed to be released by Hollywood any day now.

    August 14, 2012 at 1:05 pm | Report abuse |
1 2 3 4 5 6 7 8 9 10 11 12 13 14