. Brigham Young University science bulletin. Biology -- Periodicals. MlMDAE OF THE NEVADA TEST SlTE vj*'. V! ».V Fig. 8. Terrain near Tippipah Spring, favorable for growth of Ephedra nevadcnsis, a typical plant just in front of the collector, H. H. Knight. supply and extremes in temperature, a compar- able variation in biotic communities may be ex- pected. Allred, Beck and Jorgensen (1963) were unable to apply community classifications such as Life Zones, Biotic Provinces, etc., to fit their needs. What was desired was a workable scheme applicable to smaller biotic communities. Two major bioti
. Brigham Young University science bulletin. Biology -- Periodicals. MlMDAE OF THE NEVADA TEST SlTE vj*'. V! ».V Fig. 8. Terrain near Tippipah Spring, favorable for growth of Ephedra nevadcnsis, a typical plant just in front of the collector, H. H. Knight. supply and extremes in temperature, a compar- able variation in biotic communities may be ex- pected. Allred, Beck and Jorgensen (1963) were unable to apply community classifications such as Life Zones, Biotic Provinces, etc., to fit their needs. What was desired was a workable scheme applicable to smaller biotic communities. Two major biotic divisions were established —the Desert Scrub (Fig. 9) and the Desert Woodland (Pigmy Forest) (Fig. 10) after the concept of Munz and Keck (1959). The former comprises the vegetative patterns of the low- land basins and foothills (bajadas). The latter constitutes the plant types of the higher eleva- tions, such as mesas and mountains, distin- guished in the main by the Pinyon-Juniper forest. These two major divisions were then broken down into smaller vegetative entities designated as communities. The same biotic communities described for studies by Allred et ah, (ibid.) are applied to the present inves- tigation. (See Fig. 3 for a delineation of these communities.) Of significant consideration and interest in any application of a biotic community designa- tion to the Nevada Test Site, is the geographic position of the Great Basin in relationship to the Mohave Desert. In this respect the basin desert concept as defined by Jaeger (1957) has been used (Fig. 1). The line of demarcation is naturally not as exact as the figure indicates. Actually a great intermixing takes place along this theoretical boundary. The influence of each region is re- flected by the complex of plant and animal types which have been previously reported, and as will be noted in this study indicates clearly the occurrence of the Great Basin and Mohavian influence, both north and south and at the region o
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