Welcome to the Slashdot Beta site -- learn more here. Use the link in the footer or click here to return to the Classic version of Slashdot.

Thank you!

Before you choose to head back to the Classic look of the site, we'd appreciate it if you share your thoughts on the Beta; your feedback is what drives our ongoing development.

Beta is different and we value you taking the time to try it out. Please take a look at the changes we've made in Beta and  learn more about it. Thanks for reading, and for making the site better!

Parasitic Wasp Reprograms Its Host Spider

michael posted more than 12 years ago | from the pulling-the-strings dept.

Science 39

Dan writes: "The New York Times has an article about a bizarre Costa Rican spider parasite. This tiny wasp larva forces its host, an orb spider, to do its bidding before killing it. Instead of building a normal round web, the spider spends its last night stringing together a frame. The larva then kills the spider and uses the frame to support its cocoon. The scientist who discovered the behavior still doesn't know how the parasite does it." Since this is an older article, there's probably some more recent information available about this critter.

Sorry! There are no comments related to the filter you selected.

Larva motto... (5, Funny)

b_pretender (105284) | more than 12 years ago | (#2537698)

Embrace and extend.

Re:Larva motto... (1)

Catskul (323619) | more than 12 years ago | (#2538325)

The problem with your analogy is that the larva is the little guy in this situation. A better analogy is probably the praying mantis. It lures a mate, takes what it wants from its mate, then eats it. For the praying mantis, its more like : Embrace and Digest, which is seem more appropriate for Microsofts than the (now sarcastic) euphemism that people use: Embrace and Extend.

iBook Info for Error 808 (-1)

TRoLLaXoR (181585) | more than 12 years ago | (#2537731)

<b>iMac/233- $300

iBook/300- $ 500 (Blueberry)
iBook/366- $ 750 (Graphite or Tangerine)
iBook/466- $1000 (Graphite or Key Lime)

These are prices from eBay, which are cheaper than reseller prices. Most of
the places selling these used models would charge about %20-%50 more.

All of these iBooks above have 66MHz systems busses, which the CPU uses to
talk to the other system components (RAM, PCI bus, etc.). Max resolution is
800x600 on all of them. The model you're looking at won't have a FireWire

One thing I have to say about the iBook 2 vs. the original-- the original is
so much more fucking durable. My new iBook has more ports, can hold more
RAM, higher resolution, etc-- so basically it's a desktop replacement-- but
as of now I am planning on selling my iBook/300 in another year to grab a
Graphite 466 model to take with me when I travel. For travel it can't be
beat. The thing can be taken anywhere in anything, whereas the new iBook is
so prone to micro-scratches in its outer shell it isn't funny. There's
concern for the keys scratching the screen, too, since the lid is flimisier
than the old iBooks', but so far mine hasn't.

With enough RAM all of the above iBooks can handle Mac OS X well-- just make
sure to be using at least 10.1 because it's a major improvement over 10. A
lot of the big software titles require 10.1 too. I can't find any links to
the 512 meg chip for the older iBooks, but I think the ones they sell for
the new iBooks will work (the specs seem to match).</b>

Goauld (-1, Offtopic)

Anonymous Coward | more than 12 years ago | (#2537735)

Get ready for a bunch of lame Stargate references...

Neat. (0)

forkspoon (116573) | more than 12 years ago | (#2537779)

It would be incredible if the wasp had reordered the spiders DNA or something.



Re:Neat. (1)

Catskul (323619) | more than 12 years ago | (#2538357)

That wouldnt make any sense. If the wasp had reordered the DNA, the behavior wouldnt show up untill the next generation of the spider, except since the larva kill the spider, thats never gonna happen. I think that Its much more likely that the web spinning is controlled by hormones released in a cycle, just as most behaviors are in the lesser animal groups.

Re:Neat. (0)

forkspoon (116573) | more than 12 years ago | (#2547540)

Unfortunately, it is possible to modify DNA, RNA, and therefore protein construction in a living organism. It just requires lots of the enzyme to do it, but the DNA of a living organism can be spliced and reordered.



Re:Neat. (2, Interesting)

bosef1 (208943) | more than 12 years ago | (#2543182)

Interestingingly, there is a a parasite that sort-of does reorder the host's DNA. There is a wasp that lays its eggs tobacco hornworm. It also injects a virus into the hornworm to disable the hornworm's immune cells, and mess up some other biological systems. Here [] is a link the researcher, but I couldn't find a link to an article explaining exactly what happens.

National Georgaphic (2, Informative)

Ivan Raikov (521143) | more than 12 years ago | (#2538064)

The August issue of the National Geographic magazine had a (what I thought to be interesting) article on spiders in general, and this larva in particular.

More information here. []

spiders and drugs (3, Informative)

tony_gardner (533494) | more than 12 years ago | (#2538065)

Here's the original article tu reList/august2000/406255.pdf

Since the researchers think that it's a response of spiders to chemicals. Here's the famous spiders on drugs experiment. .h tml

Re:spiders and drugs (1)

tony_gardner (533494) | more than 12 years ago | (#2538131)

Remove the space to make the address work, obviously.

Yum! (4, Interesting)

yuggoth (85136) | more than 12 years ago | (#2538071)

Some time ago, I saw an interesting documentary on TV about snail parasites (IIRC, the parasite was some kind of worm). The snail gets infected by eating the parasite's eggs which stick to edible plants. The eggs hatch inside the snail, and the parasitic larvae move to the snail's antennae where they start to grow. When they are mature, they somehow modify their hosts' behaviour - normally, the snail would hide from predators during the day. But now it exposes itself to birds, which mistake the swollen, bloated, parasite-containing snail antennae for yummy insects, rip them off and eat them. The snail doesn't survive this for long...
Inside the bird, the parasite lays its eggs and dies. The eggs get spread with the bird droppings, which hopefully fall on snail-edible plants, etc...

Re:Yum! (0)

Anonymous Coward | more than 12 years ago | (#2545932)

I saw this on NGC [] .

I believe they said that many infected snails do survive, grow back their antennae, and actually have a longer lifespan than normal snails!

It's pretty obvious really... (3, Funny)

SoftwareTechie (244191) | more than 12 years ago | (#2538186)

The wasp married the spider.

Damn! (0)

Anonymous Coward | more than 12 years ago | (#2538424)

Damn, now if I can just do that to Commander Taco, I can make him MY personal gimp instead of JonKatz's personal gimp!

Toxoplasma gondii and host manipulation (4, Interesting)

Guppy (12314) | more than 12 years ago | (#2539083)

One interesting example of host behavioral modification is in the single-celled protozoan Toxoplasma gondii.

This organism has two different hosts in it's life cycle, cats and rats. An infected cat will shed parasites in its feces which are then picked up by rats. The parasites take up residence in the rat until it is eaten by a cat, completing the life cycle.

The parasite takes up residence in various tissues of the rat, including the brain. Interestingly enough, infected rats show behavioral modifications. They become less cautious and more "curious", and may lose their normal aversion to the scent of cat urine -- thus making them easier prey.

Toxoplasma gondii also frequently infects humans, with some estimates suggesting up to half of the population having been exposed. It is dangerous to human fetuses and individuals with deficient immune systems (such as those with AIDS), but healthly carriers are usually asymptomatic.

It is uncertain whether or not the organism produces behavioral changes in humans, but there have been some suggestions that it might. Toxoplasma gondii link [] .

Hey, maybe that's what I've got! Re:Toxoplasma (1)

func (183330) | more than 12 years ago | (#2540168)

Perhaps this is why I compulsively stick my neck out all the time, whitewater kayaking, paragliding, motocross, etc. I hope I don't get eaten by a cat...

Creepy Philosphy Note... & a Practial Applicat (3, Interesting)

Embedded Geek (532893) | more than 12 years ago | (#2540503)

After reading the article, I got completely creeped out. The notion of one creature being controled by another creature makes me wonder about this concept we call "Free Will." I mean, it was really me who chose to eat that enchilada at lunch, right?

Philosophy aside, this could have some real applications. By manipulating basic, instinctual behavior of animals with a chemical application, you could all sorts of things.

For example, in California we have a well known problem with fruit fly infestations. There are two basic ways to deal with them: poison the buggers en masse, or sterilize a batch of males with radiation and release them (apparently, the females will mate only once, so they hook up with the guys shooting blanks and never reproduce - thus eliminating two of the creatures for the price of one). If a chemical could be developed that causes male fruit flies to somehow interrupt their mating behavior (say, do the courtship dance but never consumate the deed) you've essentially combined both techniques. Instead of releasing a few thousand sterile males (an expensive process), you wind up esentially sterilizing any male you expose - potentially many millions.

I just hope Madison Avenue never finds the equivilent formula for human buying behavior. (*GRIN*)

Re:Creepy Philosphy Note... & a Practial Appli (3, Insightful)

tooth (111958) | more than 12 years ago | (#2540995)

If a chemical could be developed that causes male fruit flies...

Only problem with this is that a *LOT* of research would have to be done before releasing it into the environment. You could affect a lot of other fly species that are very closely related to the fruit fly, but are otherwise harmless to crops.

I'm from Australia and we've learnt our leasons the hard way here. Cane toads are probably our best known stuff up. They were introduced to control another introduced species (a bettle I think) that was eating sugar cane. The Cane toad ended up completely ignore the beetle and eating every native insect it could. Now it's a major pest that is very hard to control.

Re:Creepy Philosphy Note... & a Practial Appli (1)

SourPersimmon (515360) | more than 12 years ago | (#2548364)

It's not just other species of flies that you would have to worry about. Research on Drosophila has turned up countless genes that effect behavior and have analogs in the human genome that act in similar ways. It's more unusual to find a fly gene that doesn't have a human analog that to find one that does.

Vertebrates and Invertebrates have been evolving independently for hundreds of millions of years, yet they still have much in common at the molecular level. A general introduction of behavior-modifying chemicals to the environment could potentially disrupt the behavior of just about any animal in the area.

Also, I see little reason to assume that behavioral poisons would be less expensive than lethal poisons, so where is the advantage in this approach?

The scourge of the cane toad... (2)

Manaz (46799) | more than 12 years ago | (#2552442)

The problem with cane toads, is that they can't and don't fly.

Cane beetles (also introduced to Australia) do fly. So the cane toads are pretty useless at killing them.

Instead, they breed enmasse, and are then consumed by both native animals and pets. Cane toads being poisonous, this tends to end the lives of said native animals and pets - the pets are an individual loss and can be coped with, but the native animals dying by eating cane toads is actually threatening the existance of some native species - fresh water crocodiles for example.

Re:Creepy Philosphy Note... & a Practial Appli (2, Insightful)

daveking (110208) | more than 12 years ago | (#2542278)

I mean, it was really me who chose to eat that enchilada at lunch, right?

Nope, it wasn't you. It was the grasses (wheat) secreting a chemical (starch) in order to use you (humans) as a weapon (agriculture) in their eons-old war against the trees.

Re:Creepy Philosphy Note... & a Practial Appli (2)

msouth (10321) | more than 12 years ago | (#2543848)

no, no, no. the reason we exist is...

the earth needs plastic.

Re:Creepy Philosphy Note... & a Practial Appli (0)

Anonymous Coward | more than 12 years ago | (#2542371)

Ummm, they release a LOT (!!) more than a few thousand sterile male fruit flies. They release millions of them (when they release them at all).

Parasitic WASP... (0)

Anonymous Coward | more than 12 years ago | (#2541170)

Don't you have to be one of those to get invited to Davos, World Bank, or IMF meetings? Hell, it's the only demographic that ever made it into the Oval Office!

Re:Parasitic WASP... (0)

Anonymous Coward | more than 12 years ago | (#2547134)

Kennedy was white, but he was neither Anglo-Saxon nor Protestant. Get your facts straight.

Evolution? (1, Flamebait)

Ogerman (136333) | more than 12 years ago | (#2541184)

It's stuff like this that makes the whole idea of evolution seem pretty silly. It would be one thing if the wasp used it's poison as a defense mechanism, but this is not a behavior needed for survival. The wasp could build its cacoon someplace else yet it "just happens" to have this instinct to attack the spider and inject precisely the right chemical, then wait around for it to build the messed up web, then kill the spider and use the ill-formed web for a specific purpose. Seems like pretty intelligent design if you ask me.

Re:Evolution? (1, Insightful)

Anonymous Coward | more than 12 years ago | (#2541232)

Seems like pretty intelligent design if you ask me.

Yes, "Seems" is the important word. Try reading some Richard Dawkins. I think that'll help straighten you out.

Counter-creationism... :) (0)

Anonymous Coward | more than 12 years ago | (#2541483)

That's the wackiness of evolution... it's completely *random* in what it tries out, but very directed in what it keeps. Weird things happen, they work, and so they keep happening.

The difficulty in understanding a particular adaptation is determining the chain of events? Like the question: "How did we evolve Consciousness?", and for ex. a possible answer related to evolution of language and symbolic thought which is given in the book "The Math Gene" which I recently read.

I've found that a person's disbelief in evolution can usually be explained by that person misunderstanding the process of evolution.

Re:Evolution? (1)

koekepeer (197127) | more than 12 years ago | (#2542392)

Weird, that the reply to this post got modded down to 0. He is right, though, the author should read some Dawkins (or read "on the origin of species" a bit better). Is there some hidden creationist society that visits /. on a regular basis ;-) ?

Regarding the silliness of evolution: you think in big steps, and think about design by a Creator. Of course you're entitled to think in this way, but I think you are wrong.

It is quite common in nature that parasites use a host to reproduce in, and the evolutionary advantage is quite straightforward: free food for the larva!

Now all that needs to happen is one spider that gets confused by the [chemicals produced by the] larva, and starts building disorganised webs. That's not design, it's deviance from the default behaviour since the spider is in *big trouble*. When you feel sick as hell, do you feel like cleaning up the house and keeping everything neat and ordered? So there we have the riddle solved. The larva that reproduced in this spider will have a higher chance at survival, and thus will become more widespread in the population. Of course this doesn't happen in one big step (although it could, by chance), but probably in a series of smal incremental increases of "spider disorientation" by the larva.

Why doesn't the wasp-larva make it's own cocoon? Well simply because it's energetically more favourable to use a host when reproducing.

The above comment *is* a simplification, but illustrative enough to make the point clear to a layman like you. You really should do some reading and inform yourself better before commenting on these issues. With comments like these, you just cause darwinists [like myself] to take you less seriously, which is not good for an open and constructive dialog.


Meneer de Koekepeer

um, doesn't that cut both ways? (2)

msouth (10321) | more than 12 years ago | (#2543833)

It seems to me that an "intelligently" designed spider would not have this defect...

So what is it? Is it "proof of a smart creator" that makes a cool wasp, or "proof of a dumb creator" that makes a susceptible spider?

(Personally, I think a smart creator sets the wheels in motion, turns on all the machines, activates the program, and runs behind the scenes.:)

Not so far fetched (1)

digiZen (535342) | more than 12 years ago | (#2542261)

For anyone that might think this idea is something far fetched and applies only to esoteric spiders, consider a fairly common disease, rabies. Symptoms in humans include hydrophobia (a fear of water!), and in animals we all know the usual stereotype - aggressive and foaming at the mouth. Talk about mind-altering. Does this add to the ammunition of those that say we don't have a soul, that everything we are is contained between our ears?

Re:Not so far fetched (0)

Anonymous Coward | more than 12 years ago | (#2542380)

Hydrophobia in this context is not exactly a *fear* of water, but an intolerance to ingesting it. I don't think it causes a psychological fear (rather a neurological intolerance). But, yes, it does affect the brain. There are cases of people getting bitten on the leg, then getting vaccinated, and becoming immune before the rabies has a chance to travel all the way up the nerves to the brain.

Re:Not so far fetched (1)

Johnny5000 (451029) | more than 12 years ago | (#2551097)

there are lots of cases which would show that there are physical causes of behavior... Your example of rabies is one.
Also- brain surgery (lobotomy, anyone?), drugs/alcohol/medications, etc.

Personally I dont think we have souls.. I dont even think we have free will. But that's just my opinion.


that's nothing! (2)

msouth (10321) | more than 12 years ago | (#2543737)

I was reprogramming host spiders in z80 assembler through the altair's switch-based input before this upstart wasp thing had evolved wings!

some more info (1)

saul devitt (302673) | more than 12 years ago | (#2545774)

I read about this a while ago. As I recall, researchers confirmed that the change in behavior was caused by chemicals. The added and removed the parasite at different stages of the life cycle. Once it was removed, the spider went back to its normal behavior. They may have even tried just injecting the chemicals, although I don't recall now.

Eww! (0)

Anonymous Coward | more than 12 years ago | (#2548196)

Imagine a Beowulf cluster of those!

kairomones; Host Selection (0)

Anonymous Coward | more than 12 years ago | (#2549068)

Many parasites alter host behavior. A peacock displays his tail to the peahen to indicate the degree to which he is free of parasites.

Even a mosquito will select hosts that have weakened immune systems as indicated by kairomones.

The actual uptake of the parasite's dna into the host's cell (transformation) in controlled by a competence protein which is found in the pheromones of microbes.
Check for New Comments
Slashdot Login

Need an Account?

Forgot your password?