Effects of Environmental Change on Ecosystems Change can result from: Population Changes Physical Factors Habitat Change Human Impact or Influence
Population ChangePopulation: Members of the same species that live and interact/reproduce with one another
Population ChangePopulation Characteristics: Geographic Distribution Population Density Population Growth Rate
Geographic Distribution• Geographic Distribution means the area that is inhabited by an organism. This can very small or very large depending on the organism. Juniperus communis (sp) distribution in North America.
Population DensityPopulation Density is actual number of individuals of a species in a given area. Below is a human population density map.
Population GrowthPopulation Growth is the net population growth. Number of births compared to the number of deaths in a population.This can be expressed for geographic populations. Ex: World human population, USA human population, Wisconsin human population.
Population GrowthGo here to see the world population growth rate. http://www.worldometers.info/world-population/
World Population Change 500 Years This type of graph Shows the exploding human population. Notice that this is an Exponential Curve.
Population GrowthPopulations will continue to growth unless there is a factor influences the growth.Physical changes in the environment can cause population to do one of three things 1. Migrate: Change locations to one that is better suited for survival 2. Adapt: Change to meet the physical environmental change 3. Die: if the change is severe and wide spread a species may become Extinct.