Estimation of chronological age for sporophyte maturation in three semi-evergreen ferns in Hokkaido |
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Authors: | Toshiyuki Sato |
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Institution: | (1) The Institute of Low Temperature Science, Hokkaido University, 060 Sapporo, Japan |
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Abstract: | To elucidate the life cycle time schedule of semi-evergreen ferns at natural sites in Sapporo, the chronological age for sporophyte
maturation was estimated from the increase in the number of veins (NV, number of midrib branches) from overwintered to newly
expanded leaves. The measurements were conducted on populations ofPolystichum braunii, Polystichum tripteron andDryopteris crassirhizoma at altitudes of 50–650 m on Mt. Teine to compare the interspecific maturation age of sporophytes. The mean age for sporophyte
maturation was estimated to be 7.6 yr forP. braunii, 16.5 yr forP. tripteron and 12.6 yr forD. crassirhizoma. The minimum ages (1% fertility rate) for sporophyte maturation ofP. braunii, P. tripteron andD. crassirhizoma were 5.8, 11.0 and 7.9 yr, respectively. The maturation age was shortest forP. braunii and longest forP. tripteron. The maturation age of a species thus seems to differ according to altitude and habitat, and that of the present three species
seems to be influenced by the geographical location of the species distribution.
Contribution No. 3315 from the Institute of Low Temperature Science, Hokkaido University. |
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Keywords: | Chronological fern age Maturation age of ferns NV increase Overwintered fern leaves Semi-evergreen ferns |
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