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And you see they are typically concentrated where we have more industrialized nations, where we have either more agriculture happening, more industrial agriculture, where they might be using more fertilizer and also where you might have more runoff from cities that will have nutrients like the phosphates, that will cause this eutrophication to happen. Science Biology Ecology Biogeochemical cycles. But now since they’re getting all of these phosphates, the algae can go crazy.

Eutrophication and dead zones. And if you were to zoom in, let’s say on the Caspian Sea, you can see this in more detail, you can visually see this. So the general idea, we’ve already talked about things like nitrogen and especially phosphorous being a rate-limiting factor for how fast plants can grow.

pogil activities for ap biology eutrophication answers

This is potential eutrophication in this picture. And this is happening on a macro scale. Now a lot of times when we think of ocean animals, so when we think of, I’ll just draw a little fish here, and so that’s a little fish, we don’t often think about the necessity of oxygen in the water.

You can see the algeal, algal blooms throughout this area. So, right etrophication here is a satellite image of the Caspian Sea and you can see the eutrophication.

Pogil Activities For Ap Biology Eutrophication Answers

That could be food for bacteria, and as the bacteria consume it, they also use oxygen. Eutrophicatlon me show you some more. So what has happened is, so let’s say that this right over here is some land.


And the biggest culprit here tends to be phosphates, the phosphorous in them, and that helps the plants grow more.

Eutrophication POGIL

The algae can eutrophictaion crazy and grow all over the surface of the lake. We have some pictures here. So right over here is kind of a global picture of dead zones that we have and you see them all through the world.

So this fish is going to die and other animals like it aren’t going to live because there’s not gonna be enough oxygen in that water. On one level, phosphates and fertilizers, nitrates seem like a good thing, it’s helping us grow more crops, but we have to be very careful with where it actually ends up. And this is a serious problem. But ocean animals need oxygen just like we do, and they get that oxygen, waves can crash and as the waves crash it brings in oxygen from the surface that ocean animals can use in order to live, in order to do their respiration.

So these are all the crops that we’re growing. And it actually creates what we call dead eutrlphication. Video transcript – We’re now going to talk about something called eutrophication. Eu referring to well and then trophic or trophia, referring to nourished, or nourishment. Let’s say this is a lake of it and we already know that things like phosphates are the rate-limiting factors for plants.

This is another one, and you’ve probably seen this, especially in places that might have sewage runoff. We talked about that in the nitrogen and the phosphorous cycle videos. If you’re seeing this message, it means we’re having trouble loading external resources futrophication our website.

And so, you could have photosynthetic organisms like algae in this lake and if it didn’t have the fertilizer you might just have a little bit of the algae. And you might say okay, ehtrophication why is this bad?

And this is, let’s say that’s a farm, right over there on the land where we’re growing our crops. It’s making the water less clear. But now all of a sudden, if this bacteria, because they’re able to decompose all this algae that is dying, if they’re consuming all of the oxygen, well it depletes the oxygen from the water so that the ocean animals can’t live there anymore.


So this is a serious ecological thing that eutropication have to think about. The bacteria will consume all of the oxygen in the water. It’s getting way more eutrophicqtion than would have typically happened just if there wasn’t fertilizer, if there wasn’t this runoff happening.

Well the eutrophhication is what happens once this algae dies.

Eutrophication and dead zones

And so the irony here is, by having this fertilizer runoff, by having these extra phosphates, this eutrophication, by allowing one thing to grow far more than it would have otherwise, it actually ends up depleting the oxygen that keeps other things from growing. And because of that, we humans have added a lot of nitrogen and especially phosphates to plants in order to grow them better, because we need the plants to eugrophication, to have more food.

And it comes from, or it’s derived from, the Greek for well nourished.

Intro to biogeochemical cycles. And then we have a Dead Zone.

That helps the plants grow more, which seems like a good thing, but there’s another side effect that happens because of this. As the water, either due to rain or irrigation for the crops, as the water flows from those crops into local streams and rivers, it’ll eventually find its way into local streams and rivers.

In order to ensure that the crops grow as much as they can, we add fertilizer to it, and a lot of that fertilizer might be nitrogen, it might be phosphorous in the form of phosphates, so we add fertilizer. Once this algae dies, and it starts to float down, that can be food for bacteria.