The Heinz Center's State of the Nation's Ecosystems
ecosystem: Grasslands and Shrublands
indicator Name: Population Trends in Invasive and Non-invasive Grassland/Shrubland Birds
page # in printed report: 170
location on page: na
data source: U.S. Geological Survey, Breeding Bird Survey; analysis by W. Mark Roberts. Coverage: selected grassland and shrubland areas (see the technical note).
notes: please see technical notes for further details on accessing these data from their original source; this data table comes from a specific graphic in The State of the Nation's Ecosystems report (www.heinzctr.org/ecosystems)

units: % of species increasing
  Time Interval (years)
1966-1970 1971-1975 1976-1980 1981-1985 1986-1990 1991-1995 1996-2000
Native, Non-invasive 64.3 45.5 52.9 22.9 41.2 40 28.6
Invasive 60 46.7 46.7 20 46.7 33.3 80