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Mosquitoes Beginning To Ignore DEET Repellent

Posted by samzenpus on from the we're-doomed dept.

Copper Nikus writes "An article at the BBC makes a shocking claim about mosquitoes. It appears some individual insects in the wild have developed the ability to ignore the very popular DEET repellent after a first exposure. From the article: 'To investigate why this might be happening, the researchers attached electrodes to the insects' antenna. Dr Logan explained: "We were able to record the response of the receptors on the antenna to Deet, and what we found was the mosquitoes were no longer as sensitive to the chemical, so they weren't picking it up as well. "There is something about being exposed to the chemical that first time that changes their olfactory system - changes their sense of smell - and their ability to smell Deet, which makes it less effective."'"

6 of 232 comments (clear)

  1. Umm, yeah by Desler · · Score: 5, Insightful

    Yeah, it's called evolution.

    1. Re:Umm, yeah by Anonymous Coward · · Score: 5, Insightful

      He probably is. Cynicism gets you modded up on Slashdot.

    2. Re:Umm, yeah by Desler · · Score: 5, Insightful

      Except that doesn't seem to be the mechanism here

      Really?

      Dr Logan said it was vital to understand both these permanent genetic and temporary olfactory changes that were taking place.

      He said: "Mosquitoes are very good at evolving very very quickly."

      So there are genetic chsnges being attributed to this along with the scientist saying mosquitos are good at evolving quickly. Yeah, clearly it's not evolution. *rolls eyes*

      But, you know, don't let that stop this thread turning into another Evil Religion Suppresses Science flame-fest.

      Funny, no one was doing that. Defensive much?

    3. Re:Umm, yeah by Maxo-Texas · · Score: 5, Insightful

      There is a difference.

      This is more like a human losing sensitivity to skunk or ammonia smells for the rest of their life... after smelling them once.

      It is really more akin to some humans who have unhealthy very bad digestive systems until they get a stomach parasite infection.. once.

      Then they are fine the rest of their lives.

      --
      She was like chocolate when she drank... semi-sweet at first and then increasingly bitter.
    4. Re:Umm, yeah by somersault · · Score: 4, Insightful

      You're assigning way too much intelligence to evolutionary processes. Evolution is more of a by-product than a directed process in the way that you are thinking.

      Any one mosquito may have had a random mutation that makes them more or less tolerant of DEET. The mosquitoes the ones who are more repelled by DEET are more likely to die from lack of food, so each generation the mosquitos who are most tolerant - through whatever means - are the ones that reproduce. The cycle repeats for their kids. Overall the trend will be towards greater resistance.

      --
      which is totally what she said
  2. Re:evolution by Anonymous Coward · · Score: 5, Insightful

    Actually, humans are continuing to evolve. Only the selective pressures are different.

    The traits that are now selected for are those that are suited for our human-altered world in which dangerous things have warning labels, not those traits that used to be wonderful 20,000 years ago on the savannah, but that's the whole point.

    Similarly, those who you call "genetically weak" aren't. They might have been were genetically weak on the savannah when your support group consisted of 20 uneducated protohumans, but in a world filled with medicine and technology, they are perfectly fine, and better adapted than some schmuck who puts all his energy into making powerful immune systems to destroy smallpox viruses and guinea worms that no longer exist.