Predator-prey cycles (video) | Ecology | Khan Academy
Reduced prey will then reduce the breeding success / survival of predators - causing the predator numbers to drop again (see graph below). This results in. This can lead to cyclical patterns of predator and prey abundance, where prey increase the assumption is that there is a direct relationship between the number of pelts for each of these parameters and watch what happens to the graphs. (Words describing parts of the food web: producer, consumer, predator, prey, . results on a spreadsheet and relate to limiting factors and predator/prey relationships. Have the students create predator/prey stories that relate to the graphs. 2.
So let's just think about how these populations could interact. Let me draw a little chart here that you're probably familiar with by now where we show how a population can change over time. So the time, the horizontal axis is time. The vertical axis is population. And so let's just, in our starting point, let's say that our prey is starting out at a relatively high point.
Let's say we're right there in time, and let's say for whatever reason, our predator population is relatively low. So what do we think is going to happen here? Well, at this point, with a low density of predators, it's gonna be much easier for them for find a meal, and it's gonna be much easier for the prey to get caught.
So since it's more easy, it's easier for the predators to find a meal, you can imagine their population starting to increase. But what's going to happen is their population is increasing. Well, it's gonna be more likely that they're gonna, they prey is gonna get caught. There's gonna be more of their hunters around, more of their predators around. So that population is going to start decreasing all the way to a point where if the population of the prey gets low enough, the predators are gonna have, they're gonna start having trouble finding food again, and so that their population might start to decrease, and as their population decreases, what's gonna happen to the prey?
Well, then, there's gonna be less predators around, so they might be able to, their population might start to increase. And so I think you see what's happening. The predator and prey, they can kind of form this cyclic interaction with each other. And what I've just drawn, this is often known as the predator-prey cycle. And I just reasoned through that you can imagine a world where you can have the cycle between predator and prey populations.
Predators and their prey
But you can also run computer simulations that will show this, and even observational data out in the field also shows this.
One of the often cited examples is interactions between, between the snowshoe hare, which would be the prey in this situation, and the Canadian lynx, which would be the predator, the predator in this situation.
And you see a very similar cycle to what I just drew, kind of just reasoning through it, and this, right here, is actual data. Count up the number of predators who captured at least two prey. Record the results and discuss any relationships the students observe.
For example, the predators were really fast so fewer prey survived. Discuss some of the following questions: What were successful hunting techniques used by the predators?
What were ways the prey escaped the predator? Which were the easiest? What did the predator do when the prey froze? How is the predator a limiting factor for the prey? What are important adaptations for both the predator and prey? Vary the amount of predators and keep track of the amount of prey left at the end of the game.
Keep the games about the same length of time. For example, if you had one predator, many prey should survive. Try camouflaging the predators. The prey get really frustrated because they cannot tell who is trying to capture them.
Usually more prey will die.