An introduced species is one that is not native to a given population that is either intentionally or accidentally brought into a given ecosystem. Effects of introduction are highly variable, but if an introduced species has a major negative impact on its new environment, it can be considered an invasive species. One such example is the introduction of the Asian Longhorned beetle in North America, which was first detected in 1996 in Brooklyn, New York. It is believed that these beetles were introduced through cargo at trade ports. The beetles are highly damaging to the environment, and are estimated to cause risk to 35% of urban trees, excluding natural forests. These beetles cause severe damage to the wood of trees by larval funneling. Their presence in the ecosystem destabilizes community structure, having a negative influence on many species in the system.