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And it actually creates what we call dead zones. In order to ensure that the eutrohication 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. That could be food for bacteria, and as the bacteria consume it, they also use oxygen.
Pogil Activities For Ap Biology Eutrophication Answers
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 eutrophicatio 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. Let me show you some more.
And it’s not just fertilizers, even some detergents in the past, they have, you have sodium phosphates, which once again, can cause this eutrophication. So what has happened is, so let’s say that this right over here is some land. 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.
So these are all the crops that we’re growing. You can see the algeal, algal blooms throughout this area. If you’re seeing this message, it means we’re having trouble loading external resources on our website. The bacteria will consume all of the oxygen in the water. And the biggest culprit here tends to be phosphates, the phosphorous in them, and that helps the plants grow more. 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 live, to have more food.
So this is a serious ecological thing that we have to think about. It poogil just make the surface of the water a little bit less clear, a little bit green, but hey, there’s living things here. 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 pkgil cities that will have nutrients like the phosphates, that will cause this eutrophication to happen.
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. And so, you euteophication 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. It’s really happening eutrophicxtion there’s extra nutrients that uetrophication 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.
Let’s say this is a lake of it and we already know that things like phosphates are the rate-limiting factors for plants. And you might say okay, well eutrophicayion is this bad?
Well the issue is what happens once this algae dies. 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 so this is where that algae is getting over-nourished.
And then we have a Dead Zone. 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. It’s making the water less clear. Intro to biogeochemical cycles. But now since they’re getting all of these phosphates, the algae can go crazy. The algae can go crazy and grow all over the surface of the lake.
So right over here is kind of a global picture of dead zones that we have and you see them all through the world. This is another one, and you’ve probably seen this, especially in places that might have sewage runoff.
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 eutdophication necessity of oxygen in the water.
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. We have some pictures here. 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.
Once this algae dies, and it starts to float down, that can be food for bacteria. We’ve already talked about the role of oxygen in respiration. 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. This is potential eutrophication in this picture.
That helps the plants grow more, eugrophication seems like a good thing, but there’s another side effect that happens because of this. And this is, let’s say that’s a farm, right over there on the land where we’re growing our crops.
So this fish is eutroophication to die and other animals like it aren’t going to live because there’s not gonna be enough oxygen in that water. It’s getting way more phosphates than would have typically happened just if there eutrophicatio fertilizer, if there wasn’t this runoff happening.
We talked about that in the nitrogen and the phosphorous cycle videos. Eu referring to well and then trophic or trophia, referring to nourished, or nourishment. And this is a serious problem. Science Biology Ecology Biogeochemical cycles. Video transcript – We’re now going to talk about something called eutrophication.