Your Monday Morning Parasite Show (Safe for Breakfast)

Thanks to PZ Myers for calling attention to this superb video of Corydceps, a parasitic fungus that drives its insect host up a plant before growing a spike out of its head. Leave it to David Attenborough, master of the nature documentary, to bring the beauty of this parasite to video. I've seen photographs of Cordyceps before, but I never knew it made such a graceful entrance.

What's particularly cool about Cordyceps is that it is not alone. Other parasites drive their hosts to bizarre heights. Another fungus, called Entomophthora muscae, drives houseflies and other insects upwards, climbing screen doors in some cases, before springing out of its host's body.

In the case of Entomophthora and Cordyceps, hosts go up so that parasites can come back down again--specifically, down on potential insect hosts living on the ground. But other parasites have another direction in mind. The lancet fluke drives its insect hosts up to the tops of plants so that grazing mammals may eat them. Only in the gut of a cow or some other grazer can the flukes mature and reproduce. These creatures are like the birds, bats, and pterosaurs of the parasitic world, hitting on the same brilliant solution again and again.

(Here's the place where I write about these parasites in my book, Parasite Rex.) [Update: Excerpt link at Amazon link fixed.]

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(From the Gilbert Lab at the University of Texas) This carpenter ant (genus Campanotus), and the bullet ant in the first film clip below (Paraponera clavata), have fallen victim to parasitic fungi of the genus Cordyceps, which manipulate the behaviour of their host in order to increase their own…
A dead ant infected with a parasitic Cordyceps fungus (David P. Hughes).A team of entomologists working in the Brazilian rain forest has discovered four new species of parasitic Cordyceps fungi, which infect insects and manipulate the behaviour of their hosts in order to disperse their spores as…

Reminds me of Dicrocoelium dendriticum in ants.
BTW, what drove King Kong up to the Empire State Building

Have any parasitic organisms been shown to alter the behavior of vertebrates similarly, so that the new behavior furthers the survival/reproduction of the parasite?

wait a minute!
"On the other hand, the asexual state of C. subsessilis is a lovely, white mold called Tolypocladium inflatum. "

??? since when do they assign different species (and genus!!!) names to organisms? i'm guessing they were named separately because they didn't know it was the same organism (like with other parasites, some of which Carl describes in Parasite Rex), but why do they keep it?

hehehee.. *EEEEWWWWWEEEE*.... at least those things living inour eyelashes arent so bad...

but still***EEEEWWWWWEEWEWEWEWWW***

*lol*

By MedStudentWife (not verified) on 07 Dec 2006 #permalink

I notice that one species of cordyceps from China is commonly used in TCM - it's called dong chong xia cao.

As far as the above video being safe for breakfast... I'm not so sure!

Carl,
Despite the fact that you and I disagree on the subject of evolution, darwinism and intelligent design, I have to honestly say that I find your blog to be the "Best Science Blog" that I read. You're certainly a lot more "scientific" than either "Panda's Thumb", which is filled with ideologues proselytizing their irrational belief system or "Pharyngula", which has taken near-rage and personal insult to new levels.

Charlie's just ticked 'cause he's running out of places that haven't banned him yet!

He does have a point, here, though: The Loom is more of a pure science play--and does an excellent job at it!--than PT or Pharyngula. Pharyngula's science articles are great, but it's not intended to be confined to those--it's PZ's soap box, and more power to him.

PT is likewise intended to be a forum for airing news and views about the attacks on evolutionary science by the trolls, wingnuts and other psuedoscientific loonies--again, not a pure science play, though timely scientific articles do appear and rigorous scientific arguments are made.

As for Charlie, he reminds me of the tuna in the old StarKist ads--good taste in music, but his evo-bio arguments don't go down nearly as well.

By Steviepinhead (not verified) on 09 Dec 2006 #permalink

"??? since when do they assign different species (and genus!!!) names to organisms? i'm guessing they were named separately because they didn't know it was the same organism (like with other parasites, some of which Carl describes in Parasite Rex), but why do they keep it?"

Back in the "good old days" when molecular techniques weren't as refined or non-exhistant, anamorphs (asexual forms or "Fungi imperfecti") were given totally different geni (pl. for genus?) due to their striking morphological and probably ecological, difference.

For example, Candida is an anamorph of well know S. cerevisiae.

Stevie wrote:

"Charlie's just ticked 'cause he's running out of places that haven't banned him yet!"

I wasnt banned, I was censored. Theres a big difference. I told Paul that I would respect his wishes not to post on his blog if he asked me politely and respectfully. He apparently didnt have the cojones to agree to this simple request so now were playing it the way he wants it. His response was to block my IP address, (which took about 30 seconds to fix),and to delete all my messages as they appear. So now Im pissed. ;-) Did you know that if you disconnect from your broadband connection by turning the power off to the modem for 8 hours, the ISP will think youve left for good and reset your IP address? When you reconnect the power, the ISP will assign you a new IP address.
However, despite the fact that I can post there anytime I want, I probably will not. Certainly, I will not resort to such infantile tactics as spamming the blog or launching a DOS attack, so Paul can rest assured that I will continue to behave towards him as I always have in the past: in a respectful and polite manner.

Wow. I wonder what kind of parasite it would take to make a human do something crazy before he or she died.

"Wow. I wonder what kind of parasite it would take to make a human do something crazy before he or she died."

How about a parasitic son inveigling his aged mother into changing her will, thereby bequeathing her substantial estate entirely to him and disinheriting her other four children?

By Neal Deesit (not verified) on 13 Dec 2006 #permalink

Here is a strategy used by crickets to avoid being infected by a parastic fly.

Couldn't happen to a nicer ant. These "bullet ants" are Paraponera clavata. They get their name from the wallop of their sting. In Costa Rica they're called "24 ants", because that's how long it takes for the the sting to wear off. I got my initiation one morning, wading through some low palms that I was separating like the waters of a shallow lagoon. The sting was presaged by a stridulating "eenk eenk" and the smell of garlic and then....waam! Felt like my hand was being slammed in a car door every 30 seconds or so.

That said...

Crick once said (I paraphrase) that great science is revealing the processes of the invisible. I suspect that such parasites and pathogens are a great invisible hand guiding ecosystems.

MK

Getting Things Done in Academia--toward building your intellectual infrastructure
eebatou.wordpress.com

the video is sadly no longer available.
M