. Bulletin. Science. 40 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. AMDU ALOC ATCA ATCO HYSA LATR SUTO HOST SPECIES Fig. 1. Percentage of host canopies (mean ± ) covered by multiple species of Cuscuta on the seven woody and subwoody host species in a Larrea-Atriplex ecotone in the Amargosa Valley of southern Nevada. Only host species infested with Cuscuta were computed. Narrow vertical bars denote standard errors of the means. Different letters at the top of columns indicate significant differences at p < using Tukey's Multiple Comparison Test. Host species abbreviations: Allenrolfea
. Bulletin. Science. 40 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. AMDU ALOC ATCA ATCO HYSA LATR SUTO HOST SPECIES Fig. 1. Percentage of host canopies (mean ± ) covered by multiple species of Cuscuta on the seven woody and subwoody host species in a Larrea-Atriplex ecotone in the Amargosa Valley of southern Nevada. Only host species infested with Cuscuta were computed. Narrow vertical bars denote standard errors of the means. Different letters at the top of columns indicate significant differences at p < using Tukey's Multiple Comparison Test. Host species abbreviations: Allenrolfea occidentalis (ALOC), Ambrosia dumosa (AMDU), Atriplex canescens (ATCA), Atriplex confertifolia (ATCO), Hymenoclea salsola (HYSA), Larrea tridentata (LATR), and Suaeda torreyana (SUTO). were found (Fig. 3). Despite being considered alive, some nearly dead hosts were also found in all seven woody and subwoody species. Within the same host spe- cies, significantly greater (P < ; data not shown) infestation by parasites were observed on individual hosts with greater height and canopy size. Discussion In general, Larrea plants were the most preferred host, followed by Atriplex spp. for the growth of parasites. This study supports the theory that Cuscuta spp. are not a strict generalist in the sense that they do not equally infest all available host types in proportion to host abundance. My data reinforces Kelly et al. (1988) study, suggesting that Cuscuta species are selective consumers with multiple spe- cies of Cuscuta parasitizing different species of host plants. Although Ambrosia was the most abundant species, Larrea exhibited the highest mortality from par- asitism in this study. Kelly (1992) found that Cuscuta species made morphological changes gauged towards expected resource (water and nutrient) gain from the host. Species of Cuscuta exhibit behavior in which they grow away from host plants with low nutrient availability and rapidly coiled around host plants with hi
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