. Brigham Young University science bulletin. Biology -- Periodicals. BfUGHAM YOUNC I NIVERSm Si l) \. I Hi I I I i l\ populations occupying opposite sides ol iorado Hiver in Utah. Speciation, but more particularly subspecia- tion, has occurred regularly in the several val- leys extending northward from the southern deserts. Such areas as Death Valley and thos< basins extending north, Lowei Colorado Basin and the Virgin Valley in southwestern i tah, adjoining Arizona and Nevada and S. California and the l pper Colorado Basin are examples. One example of subspeciation found in this area is Ar
. Brigham Young University science bulletin. Biology -- Periodicals. BfUGHAM YOUNC I NIVERSm Si l) \. I Hi I I I i l\ populations occupying opposite sides ol iorado Hiver in Utah. Speciation, but more particularly subspecia- tion, has occurred regularly in the several val- leys extending northward from the southern deserts. Such areas as Death Valley and thos< basins extending north, Lowei Colorado Basin and the Virgin Valley in southwestern i tah, adjoining Arizona and Nevada and S. California and the l pper Colorado Basin are examples. One example of subspeciation found in this area is Arizona elegans with Candida in the Death Vallej .u<a. eburnata in lower Colorado Basin and the Virgin Valley and philipi in the Upper Colorado Basin. The latter Basin is par- ticular!) impressive in regard to the many sub- present. Since several have been describ- ed and others discovered or recognized only re- cently, the Upper Colorado Basin lias been of special interest to us, leading directly to the request for research funds to further investigate certain possible causes (Fig. 1). It was hypothesized, therefore, that perhaps the numerous small areas of high surface radia- tion may be playing their parts by inducing var- iation into the populations of small vertebrates inhabiting these areas Thus it was proposed thai several areas in the • ppei ( olorado with a higher-than-average surface radiation be studied and thai local populations of small ver- tebrates I lizards, and it possible the small mam- mals) be compared for externa] morphological variations. It was further deemed necessary to compare populations occurring in the .ocas ot high surface radiation (25 to 100 ) with populations in the nearby or adjacent areas with a lower surface radiation | less than 20). These comparisons consist of a series ot char- acter comparisons including external morphol- ogy, color and color pattern variations. In the lizards, scale count variations are most impor- tant, wherea
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