. Biology of the Heteromyidae. Heteromyidae. Fig. 30.—Sand dune area in the Namib Desert in Ludervitz District, Namibia (25°53'S, 16°07'E). (Photo: D. A. Schhtter) late winter to early spring. Vegetation rang- es from extensive bare areas (, salt pans) to scrublands to areas supporting trees; veg- etation of the inland sand desert is especially sparse. The entire southern African region has probably been arid or semiarid for a long period of time. At least a portion of the aridity is due to the 30°S latitudinal zone of adiabatically heated dry, descending air masses (Logan, 1968), but cold
. Biology of the Heteromyidae. Heteromyidae. Fig. 30.—Sand dune area in the Namib Desert in Ludervitz District, Namibia (25°53'S, 16°07'E). (Photo: D. A. Schhtter) late winter to early spring. Vegetation rang- es from extensive bare areas (, salt pans) to scrublands to areas supporting trees; veg- etation of the inland sand desert is especially sparse. The entire southern African region has probably been arid or semiarid for a long period of time. At least a portion of the aridity is due to the 30°S latitudinal zone of adiabatically heated dry, descending air masses (Logan, 1968), but cold offshore cur- rents and geological factors also combine to cause aridity. Although there are numerous disjunctions of southern African botanical f^ '..•. Fig. 31.—A portion of the Kalahari Desert approximately 100 km NE of Mariental, Namibia. (Photo: D. P. Christian). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Brown, James H; Genoways, Hugh H. [Stillwater, Okla. ?] : American Society of Mammalogists
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