Invasive Species Essay
Some native animals cannot leave. Without proper habitat and food supplies, they die. Great amount or damage can occur from an insect species that bores holes in trees, or weeds that take over, or zebra mussels that clog up water systems, like in the great lakes. There are many species that are not native to an area, which can be very dangerous and cause harm and even death to humans and ecosystems. A non-native species could be something that brings disease to an area or to people through introduced bacteria or viruses, or possibly a plant that would crossbreed with other plants and cause major changes to plant life and the organisms that feed on them. Many humans want to design their own ecosystems to fit their needs. They bring in ornamental flowering trees, non-native fish, specialty seeds, and unusual animals. This can wreak havoc on the natural species and the established habitat. Invasive species may be as harmless looking as green plants or a frog. They don't have to be vicious looking to bring harm to an area. They may even be attractive to look at. This could have a detrimental effect on native species if bees or other pollinators preferred the flowering displays of the invasive species to the native species. Not all non-native species are invasive and harmful. But many can completely take over and entirely change whole established ecosystems.
Many non-native species have been transported in the ballast water of ships and