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Population Ecology

Population Ecology. Predator-Prey Population Dynamics. Let’s look at the relationship between fox and rabbit populations. Fox-Rabbit Populations. As the fox ( predator ) population increases, the rabbit ( prey ) population decreases. Fox-Rabbit Populations.

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Population Ecology

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  1. Population Ecology

  2. Predator-Prey Population Dynamics Let’s look at the relationship between fox and rabbit populations.

  3. Fox-RabbitPopulations As the fox (predator) population increases, the rabbit (prey) population decreases.

  4. Fox-RabbitPopulations Fewer rabbits leads to fewer foxes.

  5. Fox-RabbitPopulations But, fewer foxes leads to an increase in the rabbit population, starting the cycle all over again.

  6. Lynx-HarePopulations Another example can be seen in the relationship between lynx and hare populations.

  7. Wolf-MoosePopulations Look for the relationship between the wolf and moose populations.

  8. Predator-PreyRelationship Regardless of the species, predator-prey populations are always linked.

  9. So What? The number of organisms in any population cannot increase forever.

  10. Human Population History

  11. Human PopulationHistory

  12. Human PopulationSince 1000 AD

  13. Human PopulationIncreaseby Year <1 billion for 100,000+ years1 billion ~18502 billion ~19303 billion ~19604 billion ~19755 billion ~19896 billion ~20006.7 billion today10 billion ~2050

  14. Human Population Since 1750 Millions of People Year

  15. Human Population Since 1950 Millions of People Year

  16. Earth from Space at Night

  17. Unsustainable Growth The number of organisms in any population cannot increase forever.

  18. But Humans Don’t Have Predators! True. We’re on top of the food chain. So what’s our “prey”?

  19. What Humans Depend On What do we depend on to survive? What could cause our population to decline?

  20. Human Impacts on Ecosystems And … since our population is increasing at a breakneck pace, what impacts do we have on ecosystems around the world?

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