An update of past reports on the trends and geographic patterns of threatened or endangered species, taking a county-level comparison to find new areas of species rarity.
Results from this study indicate that use of ecological systems as a map unit could help make GAP maps more apt for modeling vertebrate habitat ranges.
With environmental change wreaking widespread shifts in species distribution, some plant communities will likely disappear while entirely new ones will appear within our lifetime. This reality requires an understanding of the distribution of plants species and careful definition within a consistent typological framework.
International organizations seriously concerned with the preservation of biodiversity find themselves confronted with the enormous task of establishing a hierarchy of sites in need of attention.
A 2001 Supreme Court decision potentially eliminated wetlands and other waters that are “isolated” from navigable waters from jurisdiction of the Clean Water Act. This report assesses the potential impacts of the decision on biodiversity.
Biologists disagree as to what constitutes a species, with the trend lately towards applying progressively smaller levels of differentiation as evidence of species status.