Please can you tell me what is the motivation of applying multi agent system to the ant colony algorithm since it is a distributed algorithm by nature? does it really improve the solution ?
The use of MAS, even with ant colony, has an important benefit that is to take profit from its interaction models(possibility to cooperate, to negociate, ..), its communication languages, ..
There must be an improvement since with MAS you have means to negociate, cooperate, that do not exist whithin ant colony alone. You must ask yourself on the existance of works that enforce ant colonies with MAS. The conclusion is that MAS are generally used to facilitate Ant colony communication and automation.