Invasion Of The Zebra Mussels
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|Invasion of the Zebra Mussels
Invasion of the Zebra Mussels
There has been an incursion into the sovereign territory of the United States of America. The Zebra mussel, an animal much akin to the clam, has colonized nearly every hard surface in the Great Lakes area, and many rivers and streams attached to them. These invaders arrived on ships from England, pumped out through the ballast. Zebra mussels are from a different environment (England), thus they are classified as an exotic species. These pesky animals threaten the entire Great Lakes ecosystem.
The invasion has created many problems for the local ecosystem. First of all, Zebra mussels take the food for which native species already compete. Each mussel consumes about a liter of different types of plankton. Small fish lose their food, and their numbers dwindle. Big fish no longer have small fish to eat, and the entire food chain is disrupted. Now that the natives donít have enough food to go around, mortality rates are...
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