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.
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References
Hughes, P. T. (1984) Population dynamics based on individual size rather than age: a general model with a reef coral example. Am. Nat.123: 778–795.
Mitsuta, S. (1977) Evolution of simple fronds inCyrtomium—pattern morphological study. Acta Phytotax. Geobot.28: 131–142.
Kachi, N. &Hirose, T. (1985) Population dynamics ofOenothera glazioviana in a sand-dune system with special reference to the adaptive significance of size-dependent reproduction. J. Ecol.73: 887–901.
Sato, T. (1982) Phenology and wintering capacity of sporophytes and gametophytes of ferns native to Northern Japan. Oecologia55: 53–61.
Sato, T. (1983) Determination of the developmental age of sporophytes of some summer-green ferns in Hokkaido, Japan. Jpn. J. Ecol.33: 161–167.
Sato, T. (1985a) Comparative life history of five HokkaidoPolystichum ferns, with reference to leaf development in relation to altitudinal distribution. Bot. Mag. Tokyo98: 99–111.
Sato, T. (1985b) Comparative life history of aspidiaceous ferns in northern Japan with reference to fertility during sporophyte development in relation to habitats. Bot. Mag. Tokyo98: 371–381.
Sato, T. (1986) Life history characteristics ofPolystichum tripteron with special reference to its leaf venation. Bot. Mag. Tokyo99: 361–377.
Sato, T. (1987a) A quantitative estimation of sporophyte development inDryopteris filix-mas (L.) Schott, determined from the overwintering phenology in the leaf. Flora179: 99–108.
Sato, T. (1987b) Geographical topocline and stability of leaf characteristics ofPolystichum tripteron in Japan with reference to venation and leaf shape. Acta Phytotax. Geobot.38: 359–279 (In Japanese with English summary).
Sato, T. &Sakai, A. (1980) Phenological study of the leaf of Pterophyta. Jpn. J. Ecol.30: 369–375 (In Japanese with English summary).
Sato, T. &Sakai, A. (1981) Cold tolerance of gametophytes and sporophytes of some cool temperate ferns native to Hokkaido. Can. J. Bot.59: 604–608.
Sato, T. &Tsuyuzaki, S. (1988). Quantitative comparison of foliage development amongDryopteris monticola, D. tokyoensis and a putative hybrid,D. kominatoensis in northern Japan. Bot. Mag. Tokyo101: 267–280.
Schneller, J. J. (1979) Biosystematic investigations on the lady fern (Athyrium filix-femina). Pl. Syst. Evol.132: 255–277.
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Contribution No. 3315 from the Institute of Low Temperature Science, Hokkaido University.
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Sato, T. Estimation of chronological age for sporophyte maturation in three semi-evergreen ferns in Hokkaido. Ecol. Res. 5, 55–62 (1990). https://doi.org/10.1007/BF02348463
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DOI: https://doi.org/10.1007/BF02348463