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In the forests of Costa Rica, there lurks a sinister variety of wasp, bent on hijacking the minds of hapless spiders for its own ends. Left unmolested, a variety of orb spider known as Plesiometa argyra spends every day of its life carefully reconstructing its perfectly round web, and feasting on the insects unfortunate enough to become snagged upon it. But should one of these spiders fall victim to this as-yet-unnamed species of wasp, the spider is stripped of its free will, and made to spend the last evening of its existence building a protective shelter for the larvae that infect it.
It is a true example of mind control in nature, and though scientists are well aware of the method of infection, they are uncertain exactly how the mind control is accomplished. When a wasp successfully attacks a host spider, the spider is temporarily paralyzed as the wasp lays eggs on the tip of the spider's abdomen. Once the wasp departs, the spider regains its ability to move, and it continues its daily web construction for the next two weeks as though nothing has changed. Meanwhile, the wasp's growing larvae cling to the spider's belly and feed on its juices through a number of small punctures.
On the night before the parasites kill their host, events take a bizarre turn. Through some unknown mechanism, the larvae compel their host spider to build a web that is very different from that it has always constructed before. Instead of a flat, round web, the spider builds a stout, reinforced platform which is much smaller. Once the new web is complete, the larvae kill their host, and cocoon themselves on the structure. It is ideal for the task, being resistant to wind and rain, and safe from the ants that inhabit the forest floor.
This behavior was first observed by Dr. William G. Eberhard at the university of Costa Rica. His observations have led him to believe that the mind control is most likely accomplished through a fast-acting chemical secreted by the larvae, but what that chemical is– and how it works– is a mystery. What he has found is that the spider's usual five-step web building process is reduced to two when held captive by these larvae, resulting in the alternate design; and he has also discovered that if he removes the larvae on the last day, just before the spider is killed, the spider will often recover after a few days of spinning the abnormal web.
It is true that many parasites are able to shape their host's behavior subtly, but never before has science observed a parasite that can manipulate its host in such a detailed, specific way. As evidenced by this finding, biology certainly has many fascinating secrets yet to be discovered.
Scientific article from the Journal of Arachnology: Under the Influence
Yes, but it if it required that they put wasp larva in my belly button, I am sure it could be avoided.
http://www.bogleech.com/bio.html
This is a website that contains dozens of these amazing animal behaviours.
Although the site may be intended for a younger audience, you can still get a more scientific descriptions of these behaviours by googling the corresponding animals name.
As an example from the above site, there is a wasp called Ampulex compressa that injects venom into cockraches in order to guide the mind-controlled cockroach into the dining rtoom of the wasp's nest.
A scientific reference to my above post:
Fouad K, Liberstat F, and Rathmayer W (1996) Neuromodulation of the escape behavior of the cockroach Periplaneta americana by the venom of the parasitic wasp Ampulex compressa. J Comp Physiol A 178: 91-100.
I'm thinking I could use this to get my last employer to stop laying off good employees and spin a web to protect new ones… if not for the eating him part.
Probably one of the most interesting articles I have read yet. Maybe the spider isnt just a host. Maybe the spider is a martyr or the Larvae Cause! Some sort of Arab spider perhaps.
Abu Ibrahim said: "http://www.bogleech.com/bio.html
Interesting, this creature also seems to invoke some maternal mind control, from the parastite section of the site:
—Body Snatcher—
Sacculina, a type of barnacle, begins its life in the ocean as a free-swimming larva. When the female locates a crab, however, she actually discards most of her own body, leaving a gelatinous blob that enters the crab and begins to grow. It sprouts rootlike tendrils which spread through the crab like a plant, even wrapping around its eyes. Eventually it forms a small hole on the crab's back, through which male Sacculina can enter and permanently join the female. The crab stops growing and stops mating, devoting all of its energy into caring for the parasite's millions of eggs and larvae as if they were its own. Male crab hosts are altered by the parasite to think and act like females, even changing physically to better carry the barnacle's young.
What a coincedence! The name of my ex-wife is Sacculina too!
Others mind-controlling species exists, or at least one: the "petite douve du foie" which in English seems to be the "lancet liver fluke" (http://en.wikipedia.org/wiki/Dicrocoelium_lanceolatum). It's lifecycle includes controlling ants' mind in orther to be eaten by sheeps.
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This will all be understood someday. We humans don't know squat about the universe or our earth. Good to be living today rather than in 1000 A.D.
Can you imagine all the implications if the environment/substance that caused mind control was discovered and isolated. The hostile applications alone are staggering.
Thanks for an informative piece.