Abstract
The demonstration of historical fauna1 change documents the fundamental principle of zoogeography that range adjustments and fluctuations in abundance are routine attributes of species. However, with the increasing appreciation of the global extent of direct or indirect environmental effects of man, changes of distribution resulting from environmental trends independent of human habitat modification are notably difficult to demonstrate. This paper describes and documents changes in the breeding distribution and abundance of several species of birds in the mountains of southern Nevada in a setting that seems relatively independent of human influence.
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