Subsequent range expansion of introduced species may or may not involve human activity. Peaches, for example, originated in China, and have been carried to much of the populated world. A naturalized plant species refers to a non-native plant that does not need human help to reproduce and maintain its population in an area that it is not native to.
The apple snail was released in Southeast Asia with the intent that it be used as a protein source, and subsequently to places like Hawaii to establish a food industry.
In the broadest and most widely used sense, an introduced species is synonymous with non-native and therefore applies as well to most garden and farm organisms; these adequately fit the basic definition given above.
One of many invasive varieties of honeysuckle in the United States, Japanese honeysuckle was brought to Long Island, NY, in for ornamental use and erosion control. These examples represent only a small subsample of species that have been moved by humans for economic interests. Interplanetary contamination It has been hypothesized that invasive species of microbial life could contaminate a planetary body after the former is introduced by a space probe or spacecrafteither deliberately or unintentionally.
Since they need calcium to build their shells, they attach themselves to concrete or cement, which in many cases is house foundations, weakening houses.
For example, three species of rat the black, Norway and Polynesian have spread to most of the world as hitchhikers on ships, and arachnids such as scorpions and exotic spiders are sometimes transported to areas far beyond their native range by riding in shipments of tropical fruit.
Sea lampreys in the Great Lakes have had their numbers significantly reduced by a lampricide that kills larvae, which hatch in streams, before they can enter the lakes.
He deliberately released eighty starlings into Central Park in New York City inand another forty in Further spread of zebra mussels through U. It has a strong potential to overgrow natural biotopesand represents a major risk for sublittoral ecosystems.
Introduced to the U. The results of this introduction included increased levels of heterozygosity and a larger population size.
Before the 20th century, numerous species were imported and released without government oversight, such as the gypsy moth and house sparrow. As trade, tourism, and transport increase, so too does the inadvertent movement of invasive species. While these benefits have in some cases been realized, introductions have also resulted in unforeseen costs, particularly when introduced species take on characteristics of invasive species.
This includes placing signs at boat ramps, campsites, state borders, hiking trails, and numerous other locations as reminders of policies and potential fines associated with breaking policies.
Others may become feral, but do not seriously compete with natives, but simply increase the biodiversity of the area. The spread of potato beetles in Europe and North America was partly assisted by the fact that it developed resistance to DDT in the mids.
Unintentional or accidental introductions are most often a byproduct of human movements, and are thus unbound to human motivations.
Plants with the highest invasive potential are prolific seeders and vigorous growers which have the ability to adapt well to a variety of conditions. But where man goes, invasive species frequently follow, or at least hitch a ride.
The Norway maple displaces native trees and has the potential to dominate a landscape in both the Northeast and Northwest. Estimates of the cost of invasive species to the United States alone are in the tens of billions of dollars yearly.
Mehrhoff, University of Connecticut, Bugwood.
Native species have not evolved alongside these plants and have trouble competing. The introduction of English ivy dates back to the early s when European colonists imported the plant as an easy-to-grow evergreen groundcover.
Now growing invasively in most states, purple loosestrife can become the dominant plant species in wetlands.Asian carp introduced into the United States outcompete native fish for both food and space, leading to large declines in native fish populations.
21 Invasive species are the second largest cause of species extinctions in the United States. Introduced, Invasive, and Noxious Plants: Name Search: Invasive Species Executive Order View Federal and state noxious weed lists, an invasive plant list, or an introduced plant list, each with links to more information.
Most are introduced to the United States, but some are harmful pests in parts of this country, and valuable. Invasive species cost the United States approximately $ billion in damage and pest control every year.
A whole lot of species, like the Burmese pythons, which were introduced as pets, and nutria, which were brought in to promote fur trade, have established themselves on the American soil and turned the tables on the native.
Provides links to state-specific resources with an interest in the prevention, control, or eradication of invasive species.
You are here: Home / United States / State Resources Click on a state, or select from the list of states below the. Invasive alien species pose one of the most serious threats to our environment, affecting all regions of the United States and every nation in the world.
populations in the United States. It is estimated Over the past 80 years, a number of introduced invasive species have become established around U.S. ports of entry. Here are five examples – only one of which was eradicated through swift apply to all states, a patchwork of state ballast water rules is.Download