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Plants Can Turn Caterpillars Into Cannibals To Avoid Getting Eaten (nationalgeographic.com.au)

An anonymous reader quotes a report from National Geographic: A new study published in the Nature Ecology and Evolution journal found that when some plants are under attack from hungry herbivores, they emit defenses that make themselves incredibly foul-tasting to caterpillars, which spurs the caterpillars to eat each other. "Plants can defend themselves so much that they food-stress the herbivore, and then the herbivores determine that rather than have plants on their menu, they should have caterpillars at the top of their menu," said John Orrock, the author of the study and a researcher in the Department of Zoology at the University of Wisconsin, Madison. Orrock and his research team sprayed tomato plants with methyl jasmonate -- a substance plants produce in response to environmental stresses -- to trigger the plants' defense mechanisms. This chemical allowed the plant to change its chemistry, which made it less appetizing to the beet armyworm caterpillars that were placed on a treated plant. This phenomenon has been documented in a variety of plants, and research has suggested that plants can sense when surrounding plants are under attack, which can spur the production of methyl jasmonate in entire communities of plants.

14 of 56 comments (clear)

  1. Cool trick! by Anonymous Coward · · Score: 4, Interesting

    That's the same the rich do with the poor: convince them that they are, somehow richer than others, thus turning them against each other (instead of eating the -- far more nutritional! rich).

    Humans are idiots (myself included, mind you).

    1. Re:Cool trick! by jellomizer · · Score: 5, Insightful

      No the flood TV and Radio channels that shows how the other guy is so bad.
      For example. If a small group is against something that a lot of people like, they will twist it to make it seem like a much larger group in which this small group is a subset of.

      So all conservatives are racist. And all liberals are atheists. All the rich and powerful are republicans. All the whining protesters are Democrats.

      It creates an us vs them mantality, exaggerating the difference between people, where the difference isn't so great.

      --
      If something is so important that you feel the need to post it on the internet... It probably isn't that important.
    2. Re:Cool trick! by parkinglot777 · · Score: 2

      No the flood TV and Radio channels that shows how the other guy is so bad.

      Not really nowadays. There is a better medium than just TV and radio -- Internet. Social network can accelerate anything much faster and has better impact on people especially younger generations. However, media, such as TV, radio, and Internet are simply tools and should not be blamed on. So could you please stop blaming media as a whole but rather point out specific person/group when anything like this happen? Simply making a generalization is misleading and actually make things worse.

    3. Re:Cool trick! by Oswald+McWeany · · Score: 2

      Well, more accurately, humans are still animals with all that entails.

      I'd be a cannibal if humans came bite sized and covered in chocolate.

      --
      "That's the way to do it" - Punch
    4. Re:Cool trick! by DNS-and-BIND · · Score: 2, Insightful

      Conservatives who voted for Trump are either 100% behind his bigotry, or they are 100% okay with it; there is no effective difference between the two. Apathy is just as dangerous as active hatred.

      Yes, actually, if Hillary had said something so blatantly abusive, had run on a platform of racism, sexism, Islamaphobia, classism, ableism, and basically further disenfranchisement for anyone who isn't a white Christian straight cisgender male - yes, I'd feel exactly the same way about her and anyone who voted for her (and probably be looking for a bridge to jump off, if both of our candidates were so uniformly awful). Because it doesn't matter who does it, it's equally as crappy. It's not about championing a particular issue, it's about not championing the administration who literally wants to institute policies that will kill people.

      It hit me so hard because no matter how much I gave dire warnings to the people who handwaved Trump's chances away, I never truly expected him to win. I never, ever, in my heart of hearts, believed that so many people in my country believed in his racist, sexist, ableist, vile rhetoric.

      The US is much more racist and backward than we ever thought.

      --
      Shutting down free speech with violence isn't fighting fascism. It IS fascism!
    5. Re:Cool trick! by jellomizer · · Score: 2

      Many of the votes for Trump, were more votes against Clinton. They are not 100% okay with the bigotry, but that problem seems like less of an issue then the issues they saw in Clinton.

      --
      If something is so important that you feel the need to post it on the internet... It probably isn't that important.
  2. Cabbages too by Dutch+Gun · · Score: 4, Interesting

    My understanding is that cabbages can also sense when they're under attack. They emit a chemical signal that attracts wasps, who then feast on the herbivore invaders. Pretty cool, evolutionary warfare. It's led to some extraordinary adaptations in nature's brutal eat or be eaten battle arena.

    --
    Irony: Agile development has too much intertia to be abandoned now.
    1. Re:Cabbages too by Sumus+Semper+Una · · Score: 2

      The most interesting thing I found about the cabbage/wasp/butterfly link was this:

      Certain kinds of butterflies landing on part of a cabbage (or yellow mustard - a cabbage relative) for some time can trigger the plant to release a chemical that makes the butterfly less likely to lay its eggs. Parasitic wasps are very sensitive to butterfly pheromones (for obvious reasons, since they lay their eggs alongside the caterpillar eggs). The chemical released by cabbage family plants against butterflies also attracts parasitic wasps.

      I wonder if the pheromones and the plant's chemical defense are closely related. The wasps certainly seem to be sensitive to both. And to the wasp it's probably as simple as "this smell means a good place to lay my eggs for my young to feed and thrive."

  3. . . . and here I wackyparsed that title, as . . . by PolygamousRanchKid+ · · Score: 3, Funny

    "Plants Can Turn Caterpillars Into Cannabis To Avoid Getting Eaten!"

    . . . but, being that I'm watching a story on the news where folks who got caught tossing Molotov cocktails just got released because they have sympathizers in the Hamburg government . . . everything seems a wee bit surreal today.

    --
    Schroedinger's Brexit: The UK is both in and out of the EU at the same time!
  4. Re:"The Happening" movie reference by amalcolm · · Score: 2

    The day of the Triffids got there first, I think. https://en.wikipedia.org/wiki/.... 1951. Film came later

    --
    Time for bed, said Zebedee - boing
  5. Re:. . . and here I wackyparsed that title, as . . by Oswald+McWeany · · Score: 2

    "Plants Can Turn Caterpillars Into Cannabis To Avoid Getting Eaten!".

    Man! I got some wacked out caterpillar brownies you need to try.

    --
    "That's the way to do it" - Punch
  6. Re:New Study my fuzzy caterpillar a$$... by GrumpySteen · · Score: 4, Insightful

    Studies build on earlier studies. That's how science progresses. The induced cannibalism in the caterpillars is the new discovery in this case.

    If you weren't in such a hurry to dismiss the article as unworthy, you might have noticed your link doesn't mention anything about induced cannibalism.

  7. A little overdramatic by Sumus+Semper+Una · · Score: 4, Informative

    While it is cool that plants have defense mechanisms against herbivores, the claim that the plants are "turning caterpillars into cannibals" is a bit of a stretch. Caterpillars are already cannibalistic in a pinch. All the plant does is make itself taste bad. If I only have meat and vegetables in my refrigerator and all the meat spoils first, then my choice to eat vegetables does not imply that meat's tendency to spoil faster turns me into a vegetarian.

  8. And so it begins... by SkyLeach · · Score: 3, Funny

    Our real enemy will be the humble potato and in one fell swoop everyone with a hankering for french fries or potato chips will become a zombie.

    --
    My $0.02 will always be worth more than your â0.02, so :-p