Life Tables for Two Species of Dwarfmistletoe I. Seed Dispersal, Interception, and Movement
Studies were made toward construction of life tables for two dwarfmistletoes, Arceuthobium americanum on Pinus contorta and A. vaginatum f. cryptopodum on Pinus ponderosa, in one locality in northern Colorado. Seed dispersal, interception and movement in trees are described. Ninety percent of the A. americanum seeds and 94 percent of the A. vaginatum seeds that were intercepted by the trees landed on the needles, the remainder on twigs. Approximately 38 percent of the A. americanum and 44 percent of the A. vaginatum seeds produced on the plots were intercepted by the trees. Rain was a significant factor in the movement of seeds from needles to twigs, which is necessary for infection. By mid-October of the first fall, approximately 20 percent of the seeds produced by both species had been transferred to twigs. The loss of seeds from twigs during the first winter was considerably greater in A. vaginatum (approximately two-thirds) than in A americanum (about one-third). Seeds germinating on the twigs in May of the year following seed dispersal amounted to 14 percent of the total produced in A. americanum and 6 percent in A. vaginatum. These investigations are being followed up by further studies of seed losses, germination, infection, and growth of young infections.
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Document Type: Journal Article
Affiliations: Forest Pathologist, Rocky Mountain Forest and Rge. Expt. Sta., Forest Service. U. S. Dept. Agric.
Publication date: 1965-06-01
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