Bushmeat is not just a problem in Africa. Asian countries have the same problem, as the demand for meat from wild animals increases. Taking animals from tropical forest changes the whole ecosystem. It is common sense really. As the number of creatures feeding on vegetation and other animals decline there is an abundance of vegetation growth and remaining fauna. More growth kills off food for these animals.
While some plants increase, others decline. Even the amount of vegetation not consumed can fall. Uneaten vegetation crowds out growth for all, so saplings do not grow tall. Plants need animals to disperse seeds. Consequently, the variety of plants falls.
Just two decades ago the Lambir Hills National Park in Sarawak was pristine. There was an abundance of animals and trees. Now all the large animals have been killed off by hunters after a profit.
Once such dramatic change occurs there is no way back. The large animals will not breed back to original numbers. The damage also impacts on remaining animals who find their usual food source is no longer plentiful.