環境科学院 植物生態学セミナー   2012-02-07 (Tue) 14:00
(Room: A809 )

Effects of seed production on population dynamics of spring ephemeral Corydalis ambigua.

Rika Hirano
(Chairperson: ?? )

Seed production has an important role in population dynamics in many plant species. Plant individuals often limited seed production by pollen deficiency ( pollen-limitation) . Population growth is often limited by insufficient seed supply (Seed-limitation). However, there is only a few studies treated plant individual reproduction and population dynamics together. To investigate the connection between seed production and population dynamics, we conducted seed-sowing experiment, field census and simulation by transition matrix model in two populations of Corydalis ambigua differ in pollinator availability. In Nopporo population, it is known that nectar robber bumble bee induces strong pollen limitation and results in low seed-set. In Toyoha population, it is known that legitimate pollinator mainly visits to corydalis ambigua and results in relatively high seed-set.Moreover, early flowering season in Nopporo population sometimes indicate low seed-set because of time difference between pollinator activity and flowering.For these reason, large annual fluctuation in the seed-set has often been observed in Nopporo. In 2010-2011, we conducted the seed sowing experiment in nine (3treatments x 3: seed sowing, control, seed removal plot) permanent plots (1m x 1m) and mapped all individuals. After that we used the transition matrix and simulated population dynamics. The results of the study emphasize that the population dynamics strongly affected by the seed production, and annual fluctuation in the population dynamics was large in Nopporo population, dependent on the large annual fluctuation in the seed production.


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