Ants’ jobs are
determined and can be changed by age. As ants grow older their jobs move them further from the queen, or center of the colony. Younger ants work within the nest protecting the queen and young. Sometimes, a queen is not present and is replaced by egg-laying workers. These worker ants can only lay haploid eggs producing sterile offspring. Despite the title of queen, she doesn't delegate the tasks to the worker ants; however, the
ants choose their tasks based on personal preference. Ants as a colony also work as a collective "super mind". Ants can compare areas and solve complex problems by using information gained by each member of the colony to find the best nesting site or to find food.
1) How do ants communicate to each other on how many ants go out and search for foods? If not, they may all go out searching for foods at the same time.
As mentioned previously with your inquiry on bees, via
pheromones. Workers release pheromones with specific messages, such as "follow me to food" or "Attack the intruder". Nestmates recognize one another by chemicals that cover their bodies. The queen is coated with a unique blend of chemicals that advertises her presence. In addition, ants can also use touch and vibration to communicate in some situations.
These two articles cover ant pheromones quote well:
In reference to your original question, it's best if you read up on the journal article that was used to report the story. I found the journal
article here.
Let me know if you have further questions...