Polyploid cytotypes and their habitat preferences inLycopodium clavatum |
| |
Authors: | Masayuki Takamiya Ryuso Tanaka |
| |
Institution: | (1) Botanical Institute, Faculty of Science, Hiroshima University, Naka-ku, 730 Hiroshima |
| |
Abstract: | Morphological, cytological and ecological observations were made onLycopodium clavatum. Among 121 individuals from 26 populations studied 31 were of the diploid cytotype with 2n=68, 45 were of the triploid cytotype
with 2n=102 and 45 were of the tetraploid cytotype with 2n=136. The populations were divided into three types: (1) the sole
type—characterized by a single cytotype occupying an entire population, (2) the mixed type A—characterized by two or three
cytotypes occupying together the same population, but each cytotype choosing different habitats, (3) the mixed type B—characterized
by two or three cytotypes occupying together the same population and sharing the same habitat with each other. The mixed type
B populations were found in the places of the early phase of secondary succession in a plant community. In the sole type and
the mixed type A, the habitat preference for each cytotype was described as follows: the habitat for the diploid was in humid
and shady places, that for the tetraploid was in open and sunny, unstable places, and that for the triploid was intermediate
between the other two. Each cytotype can progress towards occupying their optimum habitat successively from the mixed type
B population to the mixed type A population and finally reaching the sole type population. |
| |
Keywords: | Cytotype Habitat Lycopodium clavatum sensu lato Polyploidy |
本文献已被 SpringerLink 等数据库收录! |
|