. Biology of the Heteromyidae. Heteromyidae. POPULATION AND COMMUNITY ECOLOGY 627. ;;&'^I^'»*^€ ^*t5«k-,$.^a,f^'i Fig. 3. — Photographs of habitats in the four subdivisions of the North American Desert that support substantial populations of several species of heteromyid and murid rodents: A, Great Basin Desert: a sand dune on the shore of a dry lake bed near Mina, Nevada, where D. deserti, D. merriami, D. ordii, M. pallidus, P. longimembris, Reithrodontomys megalotis and Peromysciis maniculatus occur; the rocky hillsides in the background are occupied by C formosus, Peromyscus crinitus an
. Biology of the Heteromyidae. Heteromyidae. POPULATION AND COMMUNITY ECOLOGY 627. ;;&'^I^'»*^€ ^*t5«k-,$.^a,f^'i Fig. 3. — Photographs of habitats in the four subdivisions of the North American Desert that support substantial populations of several species of heteromyid and murid rodents: A, Great Basin Desert: a sand dune on the shore of a dry lake bed near Mina, Nevada, where D. deserti, D. merriami, D. ordii, M. pallidus, P. longimembris, Reithrodontomys megalotis and Peromysciis maniculatus occur; the rocky hillsides in the background are occupied by C formosus, Peromyscus crinitus and P. maniculatus; B, Mojave Desert: a site in Joshua Tree National Monument, California, where D. merriami, P. longimembris and Peromyscus eremicus occur on the flats in the foreground and C. fallax and Peromyscus crinitus inhabit the rock outcrops in the background; C, Sonoran Desert: a locality in Organ Pipe Cactus National Monument, Arizona, where D. spectabilis, D. merriami, C. baileyi, and C. penicillatus occur; D, Chihuahuan Desert: a bajada (alluvial plain) near Portal, Arizona, where ten species of granivorous rodents have been captured and D. spectabilis, D. ordii, D. merriami, C. penicillatus, , Peromyscus eremicus, Peromyscus maniculatus, and Reithrodontomys mega- lotis are relatively common. from all other species, and as a result of these niche differences it has a unique pat- tern of abundance, distribution, and asso- ciation with other species. Ecological com- munities are assemblages of species that live together within some specified habitat or region. The composition of communities is determined largely by the ability of each species individually to meet its own partic- ular requirements. These include not only abiotic conditions that are necessary for ex- istence, but also the resolution of interac- tions with other species that permit coex- istence in the same environment. One consequence of unique niches is that species should be assembled int
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