Posted by michellefrey on 08/19/2008 4:33 pm

In certain regions of the Gulf of Mexico, there is not enough oxygen in the water to support marine life. Fish either suffocate or relocate to other areas. And, it’s not a tiny little area—it’s a big area we’re talking about. It is around 8,000 square miles, that’s about the size of New Jersey. But, what happened to the oxygen? Where’d it all go? Scientists point north, hundreds of miles up the Mississippi River to corn country.

Up in corn country, farmers use a boatload of chemicals to make their cornfields more productive. Two chemicals that are of particular concern are nitrogen and phosphorous. They are used in many fertilizers. But, when the rain shows up to nourish these crops, the water causes the fertilizers to runoff the farmland and into the mighty Mississippi River.

And, with this summer’s historic flooding in the Midwest, even more runoff from farms has been going into the mighty Mississippi. And, all of this creates a mighty mess once it gets to the Gulf of Mexico.

Just imagine how much fertilizer makes its way to the Gulf of Mexico? The Mississippi River collects all these chemicals throughout its entire length and all of it ends up in one place—the Gulf of Mexico.

Like I mentioned above, the fertilizers are used to help crops grow—well, the same is true for making algae grow in the Gulf of Mexico. These fertilizers land in the Gulf and the algae just love it. They go crazy for it and there are algae blooms and the algae grows like wild!

When all the algae die and fall to the bottom of the seafloor, this is where the story takes a turn for the worst. The algae dies and decomposes—but, since decomposition requires oxygen to make it “work” these huge masses of dying algae consume oxygen, and lots of it.

So much oxygen is taken from the sea that sealife suffocates and dies. The poor slow-moving creatures like clams, small crabs and snails have little chance to escape the oxygen-depleted waters.

Fishermen and environmentalists are actually on the same page and working together to fight this problem. Fishermen see their livelihood vanishing just like the fish in the Gulf and environmentalists want to restore the balance of the sea.

And, the Gulf of Mexico isn’t the only place where dead zones are occurring—these dead zones are scattered all across the globe.

--Michelle