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And this is a serious problem.
Eutrophication and dead zones (video) | Khan Academy
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 it actually creates what we call dead zones.
You can see the algeal, algal blooms throughout this area. And it comes from, or it’s derived from, the Greek for well nourished. So this fish is going to die pogli other animals like it aren’t going to live because there’s not gonna be enough oxygen in that water. 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.
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. And you might say okay, well why is this bad? But now since they’re getting all of these phosphates, the algae can pogol crazy.
So these are all the crops that we’re growing. And then we have a Dead Zone.
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. 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.
Eutrophication and dead zones. We’ve already talked about the role of oxygen in respiration. 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. And it’s not just fertilizers, even some detergents in the past, they have, you have sodium phosphates, which once again, can futrophication this eutrophication.
So what has happened is, so let’s say that this right over here is some land. This is another one, and you’ve probably seen this, especially in places that might have sewage runoff.
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 eutfophication over-nourishment, and over-nourishment to the point that it’s actually causing very bad things to happen in our biosphere. It’s making the water less clear. Eu referring to well and then trophic or trophia, referring to nourished, or nourishment. 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 happening on a macro scale.
That could be food for bacteria, and as the bacteria consume it, they also use oxygen. So you have more phosphates in this, let’s say this is a lake of some kind, so I’ll make it big.
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.
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Pogil Activities For Ap Biology Eutrophication Answers
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. So this is a serious ecological thing that we have to think about.
We talked about that in the nitrogen and the phosphorous cycle videos. But eutrophicxtion animals need oxygen just like we do, and they get that oxygen, waves europhication 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. That helps the plants grow more, which 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. Well the issue is what happens once this algae dies.
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, right over here is a satellite image of the Caspian Sea and you can see the eutrophication. We have some pictures here.