. Bulletin. Science. PARASITISM OF CUSCUTA ON LARREA-ATRIPLEX COMMUNITY 41. AMDU ALOC ATCA ATCO HYSA LATR SUTO HOST SPECIES Fig. 2. Biomass of Cuscuta species (mean ± ) 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 are explained in Figure 1. may strategical
. Bulletin. Science. PARASITISM OF CUSCUTA ON LARREA-ATRIPLEX COMMUNITY 41. AMDU ALOC ATCA ATCO HYSA LATR SUTO HOST SPECIES Fig. 2. Biomass of Cuscuta species (mean ± ) 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 are explained in Figure 1. may strategically take the risk of forfeiting the initial host for the chance of acquiring better resources from another host later (Kelly 1992). There are several potential explanations for the dispersal of Cuscuta seeds. First, the seeds of Cuscuta species appear to be dispersed haphazardly; animals as dispersal agents are probably rare and unimportant (Kuijt 1969). Second, some Cuscuta seeds may fall to the ground and germinate there. Third, seeds of Cuscuta may be transported by wind or water to new hosts (Kuijt 1969). Fourth, the reason why some Cuscuta species infested more than others is not completely known. It may be a maternal influence when C. denticulata seedlings from plants grown on Larrea select Larrea more often than Cuscuta spp. seedlings from other host species. Consequently, the emerging C. denticulata seedlings would grow directly and lead to a more vigorous growth on the Larrea plants. Although a number of annual and perennial herbaceous species were not infested by parasites, these species were potential hosts because they were present in the community. Biomass accumulation of Cuscuta species differed significantly among host species. Woody perennials showed the greatest Cuscuta biomass, whereas annuals, biennials, and herbaceous perennials exhibited minimal or no infestations in this study. A limited Cuscuta infection success on biennials and herbaceous perennial hosts
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