Population ecology
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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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Predator prey population dynamics l.jpg

Predator-Prey Population Dynamics

Let’s look at the relationship between fox and rabbit populations.


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Fox-RabbitPopulations

As the fox (predator) population increases, the rabbit (prey) population decreases.


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Fox-RabbitPopulations

Fewer rabbits leads to fewer foxes.


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Fox-RabbitPopulations

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


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Lynx-HarePopulations

Another example can be seen in the relationship between lynx and hare populations.


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Wolf-MoosePopulations

Look for the relationship between the wolf and moose populations.


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Predator-PreyRelationship

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


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So What?

The number of organisms in any population cannot increase forever.




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Human PopulationSince 1000 AD


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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


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Human Population Since 1750

Millions of People

Year


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Human Population Since 1950

Millions of People

Year



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Unsustainable Growth

The number of organisms in any population cannot increase forever.


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But Humans Don’t Have Predators!

True. We’re on top of the food chain.

So what’s our “prey”?


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What Humans Depend On

What do we depend on to survive?

What could cause our population to decline?


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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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