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Demographic Genetics of the Japanese Beech, Fagus crenata , at Ogawa Forest Preserve, Ibaraki, Central Honshu, Japan. I. Spatial Genetic Substructuring in Local Populations
Author(s) -
KITAMURA KEIKO,
SHIMADA KENICHI,
NAKASHIMA KIYOSHI,
KAWANO SHOICHI
Publication year - 1997
Publication title -
plant species biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.419
H-Index - 36
eISSN - 1442-1984
pISSN - 0913-557X
DOI - 10.1111/j.1442-1984.1997.tb00162.x
Subject(s) - biology , beech , transect , fagus crenata , genetic structure , population , ecology , genetic diversity , genetic variation , botany , genetics , demography , sociology , gene
The demographic genetic substructuring of local Fagus crenata populations at Ogawa Forest Preserve, Ibaraki Prefecture, central Honshu, Japan, was analyzed by means of demographic parameters and genetic markers using protein polymorphisms (allozymes). All individuals, including seedlings, various sizes of juveniles, and adult trees within two transects were mapped; size‐class structures were analyzed based on DBH and DGH measurements, and their genotypes determined for 11 different allozyme loci (a total of 46 alleles), i.e., Aap1 (3 alleles), Adh (3), Amy2 (6), Dia (4), Fum (3), Got1 (5), Got2 (3), Lap (6), Pgi (4), Pgm1 (4), and Pgm2 (5). Critical analyses were conducted to test whether genetic substructuring patterns in these two transects are correlated with the underlying environmental regimes of the habitats. Measurements of relative light intensity, soil moisture, pH, and C‐N content were made for each block in the two transects. Principal component analyses (PCA) of the environmental variables revealed that two components (Z 1 and Z 2 ) were closely related to variations in light intensity and soil moisture. The projection diagrams obtained by the environmental variables were then overlaid with the spatially localized patterns of size‐classes and genotype distributions of 11 allozyme loci examined. The results revealed that genetic variations are pooled in the juvenile trees of certain size‐classes, consisting of overlapping generations which occur in the particular sites characterized by environmental regimes. Throughout the regeneration processes, new genetic diversities are introduced through seedlings with new genotypes into the population.