Mangrove trees are sometimes good and sometimes bad. They are good because they make shorelines and hold the soil so it won't erode. The bad thing is that mangroves also overpopulate. The worst overpopulation is in the Florida Keys. Scientists think that pods floated from Africa and landed in Florida.
Red mangroves are the first type of mangrove to start growing.
This happens because they grow on sandbars and oyster bars after their debris makes land. The other types of mangroves move in and start growing after the red mangrove plants itself. The red mangroves have good storm resistance too. The red mangroves sometimes grow so huge that it can even form islands. In Kaneohe Bay the mangrove trees are bad because they kill off plants and take over mass regions on the coast of Kaneohe Bay.