By Abbigail Rigdon,
Marine conservation student
As the world becomes more globalized, countries that at one time seemed distant are now easily traveled and easily contacted. Such contact does not exist only between humans, but between other species as well. Sometimes, however, these species can be detrimental to their new environment. Foreign species may be introduced to new environments accidentally (by releasing an exotic pet into the wild, for example), or purposefully (in order to manage an overabundance of a native species by increasing its competition, or by increasing the amount of predators for the species). One major method of accidental introduction is through the release of ballast water from ships.