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- W2313479510 abstract "Aridity on the Chihuahuan Desert of the southwestern United States and northern Mexico was relieved at times during the Pleistocene by pluvial periods. These moist periods permitted invasion of the desert by more mesic species from the east, and 14 such species exist on the desert today as relicts. They show little divergence from their main populations to the east. Five areas on the Chihuahuan Desert appear to be particularly suited to the existence of relicts. All of the relicts are in constant danger of extinction by either drought or flash flood. Those of us who have worked on the Chihuahuan Desert have had an opportunity to study some aspects of desert formation and adaptation not available to workers on other deserts. The opportunity has arisen through the existence of pluvial periods during or immediately following the Pleistocene which apparently caused a gradual withdrawal of the eastern border of the desert and permitted the invasion of more mesic-adapted species from the east. The return of arid conditions in the Recent Era and the eastward advancement of the desert during the drought have enabled us to see how mesic species are gradually crowded out by increasing aridity during desert formation, and how some mesic species adopt a precarious form of existence around oases. In years, there has been considerable discussion in the literature of relict species which evolved during isolation resulting from Pleistocene splits in the ranges of ancestral species. The recent isolates of the Chihuahuan Desert, however, which for the the most part show little morphological divergence from their main populations to the east, have been largely ignored. THE CHIHUAHUAN DESERT The Chihuahuan Desert (Fig. 1), or Chihuahuan Biotic Province (of Blair, 1940, 1950; Dice, 1943; Goldman and Moore, 1945; Milstead, In press), lies in the area bounded by the 99th and 108th meridians and the 21st and 33rd parallels. The topography of the desert is rugged with alternating highlands and basins. For practical purposes, it may be thought of as a plateau with elevations from 2000 to 5000 feet that is crossed by several mountain ranges which rise to elevations of from 6000 to over 9000 feet. The climate is arid and of the" @default.
- W2313479510 created "2016-06-24" @default.
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- W2313479510 date "1960-08-10" @default.
- W2313479510 modified "2023-10-17" @default.
- W2313479510 title "Relict Species of the Chihuahuan Desert" @default.
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- W2313479510 doi "https://doi.org/10.2307/3669459" @default.
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