“Now, for the quarantine you probably didn’t hear about: 5 Pennsylvania townships and 2 boroughs are on high alert after the state Department of Agriculture confirmed the presence of an invasive insect that threatens its grape vines, fruit trees and logging industry.
Invasive species can be devestating for the new area. They can be plants, animals, insects, birds, or even pathogens.
The West Nile virus is an example of a pathogen.
Many of the problems have come into new ares by accident. International travel and shipping are the source of so many intruders. Insects and plant life are stowaways in containers, and food and animals may be brought home as an innocent mistake.
Some invasive species are introduced on purpose, especially in historic times.
In Hawaii there is the issue of feral pigs mentioned here http://en.wikipedia.org/wiki/Invasive_species_in_Hawaii
“The feral pig is also a major threat to Hawaii’s natural ecology. Feral pigs that were originally released or escaped from farms have been breeding in the wild and creating a large population of wild pigs in Hawaii. They have major impacts on the ecology because they are very destructive of plants and habitat and lack predators. Their burrowing patterns also destroy bird nesting grounds and lead to erosion . These burrows also create standing pools of feces infested water that serve as ideal breeding grounds for mosquitoes. Many native Hawaiian birds are dying because of diseases transmitted by increasing numbers of mosquitoes.”
North American problems are listed here http://en.wikipedia.org/wiki/List_of_invasive_species_in_North_America.
A plant example is Kudzu. It looks beautiful, but is killing all the native vegatation underneath the leaves.
Species like this fish from China, eat the native species and take over the environment.
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