Mosquitoes would only avoid something if being near it made them less likely to reproduce successfully. Seeing that, we've decided to surround ourselves with those things.
I'm pretty sure if there were a negative effect of chickens on our reproductive rate, we would have discovered it any time in the last couple thousand years living in proximity to chickens.
That said, they do stink. I don't blame the mosquitoes at all.
Poppycock. It is widely known that miasmas such as chicken odour are the source of disease, not a cure. In fact even the name "malaria" means "bad air" for this reason.
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For when the morning breezes blow toward the town at sunrise, if they bring with them mist from marshes and, mingled with the mist, the poisonous breath of creatures of the marshes to be wafted into the bodies of the inhabitants, they will make the site unhealthy.
"""
If the Earth's surface was curved, clearly all the miasmas would just roll downhill away from us and we wouldn't have any disease. Therefore, the Earth is flat. I love how science explains everything!
Nonsense! Anyone knows that the miasmas are best dispersed with two good fires, and the constant use of tobacco smoking! Even the very small children should they be able, must smoke. Why in Oxford all students must, on pains of a good thrashing.
With all due respect to the 'use the existing headline' convention, a minor edit to this Yoda-style instance would dramatically decrease misunderstanding of the article topic.
(While I enjoy hearing British English most of the time this commaless reversing tends to drive me a little nuts.)
As I understand it, the issue is that, while it might repel them to begin with, mosquitos evolve quite rapidly, and sooner or later they will learn to ignore the repellent, and it will be ineffective. There are tons of substances that mosquitos and insects find repelling. We have mapped the receptor in mosquitos which, when activated, make them shy away from a substance. But if it doesn't kill the mosquitos, or damage them, they will eventually learn that it's unharmful, and it will no longer be effective.
I assume this works because the mosquitoes don't want to get eaten. Unless this somehow causes chickens to evolve to no longer eat mosquitoes, it seems unlikely this effect would diminish over time.
chicken actually eating, ie. killing mosquitoes, suggests similar technical solution - like miniature anti-aircraft weapon consisting of small laser and either camera or radar (like Google's recently demonstrated 60GHz penny sized one) which one would hang over the bed. By focusing laser right at the position of the mosquito it can be pretty safe for humans around. Can be a tool against flies too.
> But if it doesn't kill the mosquitos, or damage them, they will eventually learn that it's unharmful, and it will no longer be effective.
If a repellent stimulus no longer harms them, that doesn't automatically mean there's any strong advantage to not being repelled anymore.
(And I would avoid uses phrases like "learn" to describe this behavior. A population of mosquitoes may evolve to no longer be repelled by chicken smells, but that doesn't mean they're remotely aware of it.)
You might be right. But if we got mosquito bites low enough for even a short time it might bring the maleria infection rate to below one and wipe it out.
DEET has been in use as an insect repellent since 1946. Insensitive mutant insects are known but in most cases it's still effective. The more distinct mechanisms of action we have available the less likely insensitivity will become a problem, so it's worth identifying the active compound in chicken odor.
Only if "not being repelled by chicken smells" conferred a large enough selective advantage over "being repelled by chicken smells". Mosquitoes have plenty of other animals to bite besides humans, so it's not immediately apparent that it would change selection pressures at all, much less to the degree needed to push the population genotype in one direction or the other.
Are chickens a significant predator of mosquitoes or mosquito larvae? That would make a lot of sense. Or maybe some other bird that chickens happen to have a smell in common with.
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[ 4.3 ms ] story [ 83.6 ms ] threadThe rest of you may have a comma as well. :)
This concerns me a little.
1. https://www.youtube.com/watch?v=yxFlX1BudYw
That said, they do stink. I don't blame the mosquitoes at all.
""" For when the morning breezes blow toward the town at sunrise, if they bring with them mist from marshes and, mingled with the mist, the poisonous breath of creatures of the marshes to be wafted into the bodies of the inhabitants, they will make the site unhealthy. """
https://en.wikipedia.org/wiki/Miasma_theory
If the Earth's surface was curved, clearly all the miasmas would just roll downhill away from us and we wouldn't have any disease. Therefore, the Earth is flat. I love how science explains everything!
(While I enjoy hearing British English most of the time this commaless reversing tends to drive me a little nuts.)
http://www.nature.com/nature/journal/v502/n7472/full/nature1...
https://en.m.wikipedia.org/wiki/Anthranilate-based_insect_re...
I will post a link to the other paper if I find it.
Aedes aegypti Mosquitoes Exhibit Decreased Repellency by DEET following Previous Exposure: http://journals.plos.org/plosone/article?id=10.1371/journal....
If a repellent stimulus no longer harms them, that doesn't automatically mean there's any strong advantage to not being repelled anymore.
(And I would avoid uses phrases like "learn" to describe this behavior. A population of mosquitoes may evolve to no longer be repelled by chicken smells, but that doesn't mean they're remotely aware of it.)
Might actually work as long as only a statistically insignificant minority of ppl is using it. After that point, it's Darwin all over again.
http://onlinelibrary.wiley.com/doi/10.1046/j.0269-283x.2002....