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We have some pictures here. And so you might think that this is a good thing but as we’ll see over the course of this video, this is really about over-nourishment, and over-nourishment to the point that it’s actually causing very bad things to happen in our biosphere.

So you have more phosphates in this, let’s say this is a lake of some kind, so I’ll make it big. And this is happening on a macro scale. So, right over here is a satellite image of the Caspian Sea and you can see the eutrophication. And then we have a Dead Zone. So this is a serious ecological thing that we have to think about.

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.

And it comes from, or it’s derived from, the Greek for well nourished. And the biggest culprit here tends to be phosphates, the phosphorous in them, and that helps the plants grow more.

And you see ejtrophication 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 pogl have nutrients like the phosphates, that will cause this eutrophication to happen. Video transcript – We’re now going to talk about something called eutrophication. It’s really happening because there’s extra nutrients that are allowing these algal blooms or aldral algo, I don’t know, to go out of control and when they decompose the bacteria is sopping up all the oxygen, nothing else can live.


Eu referring to well and then trophic or trophia, referring to nourished, or nourishment.

Intro to biogeochemical cycles. The bacteria will consume all of the oxygen in the water.

Pogil Activities For Ap Biology Eutrophication Answers

The algae can go crazy and grow all over the surface of the lake. It could just make the surface of the water a little bit less clear, a little bit green, but hey, there’s living things here. And so this is where that algae is getting over-nourished.

You can see the algeal, algal blooms throughout this area. So this fish is going to die and other animals like it aren’t eutrophicaton to live because there’s not gonna be enough oxygen in that water. If you’re seeing this message, it means we’re having trouble loading external resources on our euhrophication.

It’s making the water less clear. 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. We’ve already talked about the role of oxygen in respiration. 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.

And because of eutrophicztion, we humans have added a lot of nitrogen opgil especially phosphates to plants in order to grow them better, because we need the plants to live, to have more food. Science Biology Ecology Biogeochemical cycles. So what has happened is, so let’s say that this right over here is some land. 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 eutropjication that keeps other things from growing.


But now since they’re getting all of these phosphates, the algae can go crazy.

Eutrophication and dead zones. And so, uetrophication 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. Eutrphication 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.

Once this algae dies, and it starts to float down, that can be food for bacteria. And you might say okay, well why is this bad? It’s getting way more phosphates than would have typically happened just if there wasn’t fertilizer, if there wasn’t this runoff happening. Let’s say this is a lake of it and we already know that things like phosphates are the rate-limiting factors for plants. So right over here is kind of a global picture of dead zones that we have and you see them all through the world.

That helps the plants grow more, which seems like a good thing, but there’s another side effect that happens because of this. This is potential eutrophication in this picture.

Eutrophication Pogil

So these are all the crops that we’re growing. Eutrophicatio is another one, and you’ve probably seen this, especially in places that might have sewage runoff. Well the issue is what happens once this algae dies.