Invaders Group 2: Impact Health
“Alien species of plants and animals have invaded every continent. They have enormous powers; they spread disease; they devour our buildings. Some are destroying the very land under our feet. Think of them as the first wave of an assault that could drive the greatest mass extinction since the end of the dinosaurs. What is causing this invasion, and what can we do to stop the rising tide?”
Directions:
Each group will explain what happened in their section of the video. Explain
· The “Impact” or what was happening in the area.
· What was the invader and where did it come from?
· What are they doing to control or fix the situation?

So many people all around the world believe that aliens come from Mars, but is that really true? NO, of course not. Only if you are crazy and think the world's going to end in years to come. Alien life forms live around us everyday spreading diseases and killing our native plant and animal life. In Africa, in Lake Victoria, Nile crocodile attacks are increasing daily, and taking inocent lives. But the crocodiles aren't from here, they are from the Nile hundreds of miles away. In fact, they are eating all the fish, but their population hasn't increased. With all the fish gone, fishers have a problem paying their taxes becasue there are no fish. Othe animals can't survive becasue they have nothing to feed on. Making survival very difficult.
There is also another dangerous invader. The water Hyacinth.It lets the crocodileshide in its thick layer of weeds. Since people can't see them, attacks are unknown, and you never know if there is a crocodile at your feet. It is said that a Brazilian man living in Africa brought a bouquet of them for his wedding. He then later threw them in his pond, and in some way it ended up in the river. It traveled all the way to Lake Victoria, making them a deadly weed. It has spread diseases, like Malaria, because mosquitoes nest in them and the deadly schistosomiasis parasite including the water snail as its partner. It has also clogged water resouces, and poisoned drinking water. Researchers and local people have decided to cut down this weed's population by putting in another invader. They are called weevles.James A. Ogwang, PhD, brought them and trained them to kill and live in these weeds.This is called biocontrol. Sometimes it doesn't work, and they create a bigger problem. Luckily, it worked for this casanario. Ogwang realized the weevles have reduced malaria, and other serious water problems. Since he has done this, it has definetly cut down the over populated Hyacinth.

Good Job showing how a simple plant can bring down an entire ecosystem and threaten the lives of people that live there. Bio-control (removing one invasive species with another) is very difficult to do. This is one situation where it worked.
75/75 points.