The wealth of its ground must, mainly, to the nutrients brought for waters of the rivers, that guarantee a productive ecosystem highly. The manguezal functions as a natural nursery for the development of many species of animals and plants.
It exists in places that suffer the influence from tides, allowing the mixture of the salty water (of the sea), with the water candy (of the river). Few are the vegetal species that possess conditions to survive in a place as the manguezal: flooded for the water of the sea, with little oxygen and high salinity. The vegetal species of the manguezal are adaptam to eliminate the salt excess, through the calls glands of salt, gifts in leves. The lack of oxygen in the ground, that remains submerged for the full tide, for a period of the day, is another limitante ambient factor for the development of the plants of the manguezal. The wealth of the manguezais attracts the human beings that of them take off the sustenance of entire families. The communities that live in the neighborhoods of the fen areas have a relation of dependence with the manguezais: they need it to acquire financial resources that guarantee its survival.. Gary Kelly insists that this is the case.