A five-year study of mast seeding inPinus densiflora |
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Authors: | Hyesoon Kang |
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Institution: | (1) Department of Biology, College of Natural Sciences, Sungshin Women’s University, 136-742 Seoul, Korea |
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Abstract: | I examined the annual pattern of seed production in three Korean populations ofPinus densiflora from 1998 to 2002. During the fall season, data were collected on the numbers of cones per tagged tree, as well as seed counts,
their mass, and seed set following dehiscence. Dbh was measured for individual trees during each spring. Overall, 80.3% of
the trees produced seed cones in even-numbered years compared with 51.6% in odd-numbered years. Moreover, trees that matured
seed cones in even years produced 12 times more seeds per tree than those in odd years. Tree diameters generally increased
significantly during the summers after odd-numbered years, although the trees at one site showed a consistent growth rate
each year after 2000. Annual variations in individual seed mass, seed set, and the proportion of damaged seed cones occurred
largely within odd or even years. Based on these results, the following conclusions were made: 1) seed-cone production ofP. densiflora is somewhat synchronized, but is not an all-or-nothing phenomenon, 2)P. densiflora tends to undergo mast seeding at two-year intervals, and 3) this alternate-year excess in seed crop may have evolved to increase
fitness, though the exact evolutionary mechanism is unclear. |
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Keywords: | dbh growth Pinus densiflora seed crop seed predation seed set |
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