. Bulletin. Science. 46 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES N iibWw. 36 00N 0 100 200 -J Kilometers Fig. 1. Sketch map showing location of four P. californicum infection study sites in southern Nevada and southeastern California. nicum individuals, which are in turn parasitic on A. greggii (Schulze and Ehler- inger 1984) and C. floridum (blue palo verde) hosts (Ehleringer and Schulze 1985). This epiparasitic phenomenon, known as autoparasitism, occurs infrequent- ly (Ehleringer and Schulze 1985). However, atypical host-parasite-autoparasite interactions involving the same three species rem
. Bulletin. Science. 46 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES N iibWw. 36 00N 0 100 200 -J Kilometers Fig. 1. Sketch map showing location of four P. californicum infection study sites in southern Nevada and southeastern California. nicum individuals, which are in turn parasitic on A. greggii (Schulze and Ehler- inger 1984) and C. floridum (blue palo verde) hosts (Ehleringer and Schulze 1985). This epiparasitic phenomenon, known as autoparasitism, occurs infrequent- ly (Ehleringer and Schulze 1985). However, atypical host-parasite-autoparasite interactions involving the same three species remain poorly understood. This ar- ticle examines to what degree age and size of A. greggii and C. floridum hosts affect the infection success of parasitic and autoparasitic P. californicum in south- ern Nevada and southeastern California. Materials and Methods Study Area and Field Measurements Field studies were conducted in the Mojave and Colorado Deserts of southern Nevada and southeastern Cahfornia, respectively, during the Fall of 1998 (Fig. I). The Colorado Desert, ranging geographically from southeastern California to southwestern Arizona, is a major subdivision of the Sonoran Desert. Phoraden-. 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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