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Human population the primary factor in exotic plant invasions in the United States
Date:2/23/2012

pulation levels and dates when states were first settled."

The researchers concluded that the positive effect of human population on the number of exotic species is probably associated with the primary sources and points of introduction along with human-assisted dispersal in the United States. They also found a strong relationship between foreign and domestic exotic richness, which might indicate that domestic and foreign exotic plants exhibit similar patterns and mechanisms of naturalization across the 48 United States despite their different origins.

Though this particular study was conducted primarily at the state level, different statistical methods produced remarkably similar results regardless spatial correlation. "However, a greater challenge ahead now is how to properly handle greater numbers of variables with increased data availability," said Guo. "Caution is needed when dealing with this data at other spatial scales such as county and county-level."


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Contact: Qinfeng Guo
qguo@fs.fed.us
828-257-4246
Pensoft Publishers
Source:Eurekalert  

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