How an Organism Becomes Considered a Nuisance Species
Out of Place Living Organisms:Every body of water represents a unique ecological system. While lakes close together may appear alike, they are actually quite different. So, in one body of water, a particular fish, aquatic plant or other aquatic life form may be an integral part of the system's unique balance. However, when put into different waters, that same species may upset the delicate balance of the new system. When an introduced organism upsets this balance, it causes ecological or economic harm and is considered to be a nuisance species.
The most devastating species introduced to the U.S. have been from other countries. Zebra mussels, hydrilla and sea lampreys are examples of these species. However, even species native to the U.S. can become a nuisance when put into the wrong environment. For example, crappies are excellent sport fish. In many lakes, they fit in well with the balance of the lake. However, in a wrong setting, the crappie could populate faster and out-compete native species for food and space. This could result in having a small lake with a lot of little crappie and little else.
In new surroundings, the out of place organisms are freed from predators, parasites, pathogens and competitors that have kept them in check. Once established these non-native species can create negative impacts.
Upsetting the Balance:Nuisance species can upset the balance of an ecosystem in a number of ways.
Not all non-natives are nuisances.Just because a species is not native does not automatically make it a nuisance. For example, fisheries biologists have introduced striped bass to many inland lakes across the country. This popular sport fish has provided anglers with added recreational opportunities and in most cases has not disrupted the balance of native species. As trained professionals, it is the responsibility of fishery biologists to study an entire ecosystem of a water body before making intentional introductions. However, just because a type of fish is present in one water body does not necessarily make it okay for it to be in another one. Therefore, individuals should not take it upon themselves to take fish from one lake and introduce them into another.
This infomation was provided by the U.S. Fish and Wildlife Service. For more information, go to their campaign website www.protectyourwaters.net.
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