TITLE Indirect measurement of gene flow in Hosta capitata (Liliaceae)
AUTHOR Ki Bae Park
Department of Horticulture, Ansung National University, Ansung 456-749, The Republic of Korea
Myong Gi Chung
Department of Biology, Gyeongsang National University, Chinju 660-701, The Republic of Korea
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ABSTRACT We investigated the nearest neighbor distances between plants, pollinator flight distances, and seed dispersal distances in two natural populations of Hosta capitata to estimate indirectly the neighborhood area and size of this species. As with most insect-pollinated species, the frequencies and shapes of all three variables showed significant skewness and leptokurtosis. Means of pollinator (bumblebees and Apis) flight distances and seed dispersal distances of H. capitata were about 1 m and 25 cm, respectively. In addition, although neighborhood sizes differed (ca. 15 and 64 individuals), as did neighborhood areas (5.86 to 17.13 m2), between the two populations, these results indicated substantial spatial restriction of gene flow within them. The present results in conjunction with previous studies on fine and large scale genetic structure using allozymes as genetic markers within and among populations of H. capitata strongly indicate that gene flow is sufficiently restricted to allow stochastic effects to play an important role in determining the genetic structure of this species.
KEYWORD Gene flow; Genetic drift; Hosta capitata; Pollinators; Seed dispersal;
ARTICLE INFO Botanical Bulletin of Academia Sinica, Volume 38 Number 4 October 1997, page 267-272, 6 pages
PUBLISHER Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China