BioQuakes

AP Biology class blog for discussing current research in Biology

Tag: ants

Zombie Apocalypse? Yes, it’s happening right now.

Most of us would think that a zombie apocalypse is simply a fantasy seen in scary movies. However, in Brazil, this freaky fantasy has rapidly turned into reality for some unfortunate carpenter ants. In the Brazilian rainforests, one could find carpenter ants whose jaws are forever locked onto a leaf, with a fungus growing right through the dead ant’s face. This is a result of the deadly zombie-like fungi that is brutally murdering ants, otherwise known as Ophiocordyceps unilateralis. 

Ophiocordyceps unilateralis initially infects its victims through spores that are launched from other zombie-ant fungi. The fungus initially penetrates the ant’s exoskeleton as singular cells, but eventually begins multiplying rapidly to form an inviolable fungal network.  This network engulfs the ant’s nervous system and muscles, and eventually the ant capitulates to the parasitic fungi. The ant slowly begins to deteriorate, beginning with simple actions like leaving its colony, to eventually losing full control of its body and dying. However, before the horrible death that the ant suffers, lots of actions take place within the ant’s body. After leaving its colony, the fungi commands the ant to move to a height of approximately 10 inches above the ground. This is done because it is the ideal height for the humidity that the fungi needs to proliferate and flourish inside the ant’s body. Next, the fungi commands the ant use its jaws to permanently form a death grip into a twig or leaf, so it will never move its body ever again. After inevitably killing the ant, the fungi proceeds to grow right through the face of the ant, where it will consequently release more spores to be spread to other ants. Over time, the fungi will spread quickly, and zombify entire colonies of ants.

It’s seriously wild to think that fungi in Brazilian jungles are brutally murdering and zombifying ants by taking over their entire bodies! Moreover, it is crazy that something as simple as a single celled fungi that enters an ant’s blood flow is powerful enough to expeditiously wipe away an ant’s entire life. With over 400 different species of this fungi in the wild, we can expect the ant zombie apocalypse to continue in the jungles of Brazil.

 

 

 

60 Million Year Old Farmers

Microbial ecologist Cameron Currie of the University of Wisconsin-Madison has made an intriguing discovery about the lives of some South American leaf-cutter ants. He found that long before humans cultivated fruits and vegetables for food ancient leaf cutter ants where cultivating fungus. The ants farm the fungus as a food source, but there are pathogenic bacteria that can kill the fungus. To thwart these malicious bacteria, the ants have formed a symbiotic relationship with a different bacteria known as actinobacteria. These actinobacteria fight off the pathogenic bacteria and protect the fungus.

File:Leafcutter ant.jpg

Leaf Cutter Ant

But how could we possibly know if fungal-farming ants existed millions of years ago?

File:Baltic amber inclusions - Ant (Hymenoptera, Formicidae)10.JPG

Ant Trapped In Amber

Well, I am glad you asked. Curries research focused on a 20-million-year-old sample of amber that had a few of these green-thumbed ants trapped inside. The ants had specialized pockets in their heads called crypts where the ants store these actinobacteria. These leaf cutter ants are walking pharmaceutical factories.

It is intriguing that some of the smallest insects on the planet where farming and cultivating food millions of years before we even thought of it. Not only that, but they have been using anti-biotics for millions of years whereas humans have only started using them 60 or 70 years ago.

What lessons do you think humans today can take away from these ants? Could they be the key to our anti-biotic overuse crisis?

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