BIOL 4130/4140 Contemporary Problems in Environmental Science Phil Ganter Biological Sciences Tennessee State University

The purple in the photo is hairy vetch (Vicia villosa) in bloom on the hillsides above the Snake River in Washington.  Hairy vetch is not native to the western hemisphere but was brought here as a commercial cover and forage crop.  It has successfully invaded much of North America and, in some areas,  has bedome locally dominant.  What we see as natural is often a recently assembled collection of species that may be in rapid transition (rapid in terms of ecological time)- changes only visible over decades of observation.  Notice that the vetch covers only one side of the hillocks.  Perhaps small changes in available soil moisture have a large impact (no data available).

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Last updated August 24, 2013