. Biology of the Heteromyidae. Heteromyidae. POPULATION AND COMMUNITY ECOLOGY 639 LU or Z) I- Q_ - o LU ZD O LU QC Li_ MACROHABITAT. rocky hillside _ I I I ! dry wash I well- | bursage | poorly- | drained , flat drained , I 0- 5 0' bursage I flat I bursage I flat I Chaetodipus intermedius 5 0-" 5- 0 Chaetodipus penicillatus Chaetodipus baileyi .5- 0 Perognathus amplus I On .5 0 Dtpodomys mernami MICROHABITAT shrub I shrub center . edge dune I dune slope I swale 5-1 0 I I Perognathus tongimembris 5-r 0 Reithrodontomys megalotis 1 I 5-1 0 Peromyscus maniculatus Microdipodops pal
. Biology of the Heteromyidae. Heteromyidae. POPULATION AND COMMUNITY ECOLOGY 639 LU or Z) I- Q_ - o LU ZD O LU QC Li_ MACROHABITAT. rocky hillside _ I I I ! dry wash I well- | bursage | poorly- | drained , flat drained , I 0- 5 0' bursage I flat I bursage I flat I Chaetodipus intermedius 5 0-" 5- 0 Chaetodipus penicillatus Chaetodipus baileyi .5- 0 Perognathus amplus I On .5 0 Dtpodomys mernami MICROHABITAT shrub I shrub center . edge dune I dune slope I swale 5-1 0 I I Perognathus tongimembris 5-r 0 Reithrodontomys megalotis 1 I 5-1 0 Peromyscus maniculatus Microdipodops pallidus ,5-1 . .. r oJ 1 1 Dipodornys mernami Dipodomys deserti 5- FiG. 8. —Examples of segregation of granivorous desert rodent species with respect to macro- and microhabitat. Left, relative abundance of five species in four distinctive types of macrohabitat in the Sonoran Desert, Organ Pipe Cactus National Monument, Arizona (unpubl. data from Petryszyn, J. S. Brown, and Harney). Right, frequency distribution of six species with respect to microhabitat features on sand dunes in the Great Basin and Mojave deserts (data from Brown and Lieberman, 1973). Note that macrohabitat types change on spatial scales of 10 to 10^ m whereas microhabitats change on scales of less than 10 m. huan Desert of southeastern Arizona, Bow- ers et aL (1987) showed that 7 of 9 rodent species significantly shifted their microhab- itat use in response to exclusion of Z). spec- tabilis, and both quadrupedal heteromyids P. flavus and C. penicillatus shifted to more open microhabitats in response to removal of all three kangaroo rats (D. spectabilis, D. meniami, and D. ordii). Taken together with the compensatory increases in density, these shifts in microhabitat utilization in re- sponse to missing species make a very strong case for the importance of interspecific com- petition in the resource utilization, popu- lation dynamics, and community organi- zation of desert rodents. But if rodents compete, what
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