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 Fewer rabbits leads to fewer foxes. Fox-Rabbit Populations But, fewer foxes leads to an increase in the rabbit population, starting the cycle all over again. Lynx-Hare Populations Another example can be seen in the relationship between lynx and hare populations. Wolf-Moose Populations Look for the relationship between the wolf and moose populations. Predator-Prey Relationship Regardless of the species, predator- prey populations are always linked. So What? The number of organisms in any population cannot increase forever. Human Population History Human Population History Human Population Since 1000 AD Human Population Increase by Year <1 billion for 100,000+ years 1 billion ~1850 2 billion ~1930 3 billion ~1960 4 billion ~1975 5 billion ~1989 6 billion ~2000 6.7 billion today 10 billion ~2050 Human Population Since 1750 Millions of People Year Human Population Since 1950 Millions of People Year Earth from Space at Night Unsustainable Growth The number of organisms in any population cannot increase forever. But Humans Don’t Have Predators! True. We’re on top of the food chain. So what’s our “prey”? What Humans Depend On What do we depend on to survive? What could cause our population to decline? 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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