. Bulletin. Science. 48 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES CO I— o I O < 80 60 40 20 HH Without parasites P VJ With parasites only llllllll With parasites and autoparasites b c. ACACIA CERCIDIUM HOST SPECIES Fig. 2. Mean (± SE) age of A. greggii and C. floridum hosts with both parasites and autoparasites, with parasites only, and without any visible parasites (control) {n = 27 in A. greggii and n = 18 in C. floridum trees). Within the same host species, different letters at the top of columns indicate statistical significant at F ^ means of host branch diameter and above-ground h
. Bulletin. Science. 48 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES CO I— o I O < 80 60 40 20 HH Without parasites P VJ With parasites only llllllll With parasites and autoparasites b c. ACACIA CERCIDIUM HOST SPECIES Fig. 2. Mean (± SE) age of A. greggii and C. floridum hosts with both parasites and autoparasites, with parasites only, and without any visible parasites (control) {n = 27 in A. greggii and n = 18 in C. floridum trees). Within the same host species, different letters at the top of columns indicate statistical significant at F ^ means of host branch diameter and above-ground host branch height, as well as to compare means of parasitic and autoparasitic canopy area in two host species. Pearsons correlation analysis (Analytical Software 1994) was performed to cor- relate abundance of P. californicum infection (total number of individuals on host canopy) with age and size of the two host species, and to autocorrelate the age and size of each host species. Mean values are presented with standard errors, and statistical significance is determined at P 30 individuals per tree) in southern Nevada and southeastern California. Substantially more A. greggii trees were infested by P. californicum than C. floridum trees. Three hundred seventy-one (371) and 69 individuals of P. californicum were found parasitizing A. greggii and C floridum trees, respectively. Age of the Acacia greggii stand was considerably older than age of the C. floridum stand (Fig. 2). Acacia greggii and C floridum trees with P. californicum infestation were significantly (P < ) older (Fig. 2), taller (Fig. 3), and larger (Fig. 4) compared to adjacent uninfected hosts of the same species. Acacia greggii and C floridum hosts showing autoparasitism were sig- nificantly (P ; Table 2). Indi- viduals of P. californicum primarily inhabited hosts' secondary branches, although some individuals were found at the junction of main trunks and secondary branches. High levels of P. califor
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