Here are the steps on how Ophiocordyceps unilateralis turns ants into zombies:
1. Spore Transmission: The fungus begins its life cycle as spores, which can be dispersed in the environment through the air or via contact with infected individuals. When a spore lands on an ant, it germinates and begins to grow.
2. Penetration: The fungus breaches the ant's protective cuticle, typically entering through weak spots like the joints or the mouth. Once inside, it starts spreading through the ant's body, primarily targeting the nervous system and muscles.
3. Behavioral Manipulation: Ophiocordyceps unilateralis manipulates the ant's behavior by altering its neural circuitry. The infected ant exhibits a unique set of behaviors, including leaving its colony, seeking higher elevations, and attaching itself to a suitable surface.
4. Body Positioning: The zombie ant climbs to an elevated location, usually the highest point in its vicinity, ensuring optimal conditions for fungal growth. It then secures itself in place using its mandibles, a behavior controlled by the fungus.
5. Fungal Growth: The fungus emerges from the ant's body and starts developing reproductive structures, primarily fruiting bodies that produce spores. The ant's body acts as a scaffold for fungal growth, enhancing spore dispersal.
6. Spore Dispersal: The fungus releases a considerable number of spores, which can be carried by the wind or picked up by other ants, perpetuating the infection cycle.
The infected ant effectively acts as a "zombie" by doing the fungus's bidding. The fungus manipulates the ant's neural pathways, altering its behavior and ultimately turning it into a tool for spore production and dispersal.
