Glossary

Alien species: “means, with respect to a particular ecosystem, any species, including its seeds, eggs, spores, or other biological material capable of propagating that species, that is not native to that ecosystem.” Executive Order 13112 (EO 13112)

Invasive species: “means an alien species whose introduction does or is likely to cause economic or environmental harm or harm to human health.” Executive Order 13112 (EO 13112)

Native species: “means, with respect to a particular ecosystem, a species that, other than as a result of an introduction, historically occurred or currently occurs in that ecosystem.” Executive Order 13112 (EO 13112)

Metropolitan Area (Metropolitan Statistical Area): area containing a recognized population nucleus (urbanized area) and adjacent communities that have a high degree of integration with that nucleus. Federal Register 65 (249): 82228-82238 December 27, 2000.

Micropolitan Area (Micropolitan Statistical Area): area containing a recognized population nucleus (urban cluster) and adjacent communities that have a high degree of integration with that nucleus. Federal Register 65 (249): 82228-82238 December 27, 2000.

Rural: all population and territory that are not within any urbanized area or urban cluster.

Urban area: all population residing within the boundaries of urbanized areas or urban clusters. Federal Register 66 (60): 17018 – 17033 March 28, 2001

Urbanized area: “densely settled core of census block groups (BGs) 1 and census blocks 2 that meet minimum population density requirements, along with adjacent densely settled surrounding census blocks that together encompass a population of at least 50,000 people, at least 35,000 of whom live in an area that is not part of a military installation.”

Urban cluster: “densely settled core of census BGs and census blocks that meet minimum population density requirements, along with adjacent densely settled surrounding census blocks that together encompass a population of at least 2,500 people, but fewer than 50,000 people, or greater than 50,000 people if fewer than 35,000 of them live in an area that is not part of a military installation.”

[ Last updated: May 3, 2010 ]