The effects of planting and harvesting on endangered species in discrete competitive systems

The influence of planting the endangered species in a discretely reproducing ecosystem is studied. By applying constant rate and variable rate planting strategies we obtain that coexistence of species that would otherwise exclude each other with no planting occurs. We also show that with a high planting rate the endangered species not only recovers from the brink of extinction but it excludes the other competing species. A similar reversal of exclusion principles occurs if the dominant species is harvested with a sufficiently high harvesting constant while the endangered species is left undisturbed. In addition, we obtain mutual exclusion of species with harvesting where there is exclusion of only one species without harvesting.