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Because the Coastal Plain is geologically and biologically a very distinct region of the southeastern United States—the southern portion having a nearly subtropical climate—the life cycles, ecology, and evolutionary relationships of its plethodontid salamanders may be significantly different from plethodontids in the Appalachians and Piedmont. Little attention has been paid, however, to Coastal Plain plethodontids. For instance, of the 133 scientific papers and posters presented at the four plethodontid salamander conferences held in Highlands, North Carolina, since 1972, only three (2%) dealt with Coastal Plain plethodontids. And yet, while it possesses fewer total species than the Appalachians and Piedmont, the Coastal Plain boasts of slightly more plethodontid diversity at the generic level. The genera Phaeognathus, Haideotriton, and Stereochilus are Coastal Plain endemics, whereas in the Appalachians and Piedmont Gyrinophilus is the only endemic genus unless one accepts Leurognathus apart from Desmognathus. In addition, Aneides is found in the Appalachians and not the Coastal Plain, but the genus also occurs in the western U.S. All the rest of the plethodontid genera east of the Mississippi River are shared by the Coastal Plain with the Appalachians and Piedmont
Explanation:
The federal design of our Constitution has had a profound effect on U.S. politics. Several positive and negative attributes of federalism have manifested themselves in the U.S. political system. Among the merits of federalism are that it promotes policy innovation and political participation and accommodates diversity of opinion. On the subject of policy innovation, Supreme Court Justice Louis Brandeis observed in 1932 that “a single courageous state may, if its citizens choose, serve as a laboratory; and try novel social and economic experiments without risk to the rest of the country.”