The issue-focused, peer-reviewed article demonstrates how ring species provide a unique glimpse into how some species came to be. A ring of populations encircles an area of unsuitable habitat. At one location in the ring, two distinct forms coexist without interbreeding. Around the rest of the ring, the traits of one species change gradually through intermediate populations into the second species' traits.
Keywords:NSDL,Conservation Biology,Learn,Learner,High school upper division 11-12,Population Biology,Social Sciences,General public & informal education,Middle school 6-8,Profession (degree program),Research,High school lower division 9-10,Life Science,Article,Teach,Teacher,Biodiversity,NSDL_SetSpec_BEN,Wildlife science,Continuing education,Education,Undergraduate lower division 13-14,Evolutionary Biology,Graduate,Ecology,Range Science,Ecology, Forestry and Agriculture,oai:nsdl.org:2200/20090721035906532T,Reference Material,Non-journal article,Natural History,Geography,Geoscience,Undergraduate upper division 15-16,Genetics & Heredity