Similarly, using Tanner's model we found that predators and their prey enjoy stable coexistence when certain conditions are met. There is one common condition that both models share to allow for stable coexistence. Discuss that condition and explain how it relates to competition and to predation. I have discussed natural communities as stratified in space and time. This implies that they have high structural organization.
Many species migrate north and south with the seasons.
Nutrient cycles are essential to the maintenance of natural systems. Humans interfere with the natural operation of nutrient cycles, and, thereby, indirectly with ecosystems. Briefly describe a nutrient cycle of your choice and then discuss how humans interfere with it. The mean value of many characteristics of populations on islands is, at the moment the species arrived on the island, slightly different than the mean value of that same characteristic on the adjacent mainland. What is happening to cause this outcome.