Life history characteristic ofCyrtomium falcatum around the natural northern boundary in Hokkaido, with reference to the alternation of generations

  • Toshiyuki Sato


To understand the life history characteristic for expanding the distributional area to colder climates, developmental age structure of population ofCyrtomium falcatum was observed along southwestern coasts of Hokkaido at the natural northern boundary of its distribution, with reference to the alternation of generations. The length and number of pinna of fertile leaves ofCyrtomium falcatum decrease towards the northern part of Japan. In southwestern Hokkaido, typically dwarf fertile leaves and gametophytes were observed growing together on cliffs nearby the sea. To estimate the developmental ages of small and dwarf leaves, the number of venation (NV: branching number of vein from midrib) of leaves was counted on each sporophyte. The sporophyte with leaves at the simple pinna stage ranging from 0–25NV, is predominant in the population of southwestern coasts of Hokkaido. The fertility of the sporophyte seems to be achieved more than five years after the germination. The gametophytes were also observed at the location to be almost equal in number to sporophytes. The number of gametophytes and sporophytes decreases with advancement of developmental stages. In the same location at Okushiri Isl. with slight gradiency of humidity, the gametophyte is predominant on the drier cliff, while the sporophyte is predominant on the humid hole. The population ofCyrtomium falcatum at the natural northern boundary in Hokkaido, seems to have the life history characteristic with alternation of generations.

Key words

Alternation of generations Cyrtomium falcatum Developmental age Dwarf maturation Number of Venation 


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  1. Farrar, D.R. 1976. Gametophyte of four tropical fern genera reproducing independently of their sporophytes in the Southern Appalachians. Science155: 1266–1267.Google Scholar
  2. —. 1978. Problem in the identity and origin of the AppalachianVittaria gametophyte, a sporophyteless fern of the eastern United States. Amer. J. Bot.65: 1–12.CrossRefGoogle Scholar
  3. Hirabayashi, H. 1974. Cytogeographical Studies onDryopteris in Japan. Hara Shobo, Tokyo.Google Scholar
  4. Kawano, S. 1975. The productive and reproductive biology of flowering plants. II. The concept of the life history strategy in plants. J. Coll. Lib. Arts, Toyama Univ.8: 51–86.Google Scholar
  5. —,A. Hiratsuka andK. Hayashi. 1982. Life history characteristics and survivorship ofErythronium japonicum. Oikos38: 129–149.Google Scholar
  6. Kira, T. 1971. Nature from the Ecological View p. 233–241. Kawade Shobo, Tokyo (in Japanese).Google Scholar
  7. Kitagawa, N. 1982. Some ecological observations on a prothallium of Hymenophyllaceae. Bull Jap. Pterid. Soc.55: 4–7 (in Japanese).CrossRefGoogle Scholar
  8. Maeda, O. 1970. On the dry matter production of two ferns,Osmunda cinnamomea andDryopteris crassirhizoma, in relation to their geographical distribution in Japan. Jap. J. Bot.20: 237–267.Google Scholar
  9. Nishida, M. 1958. The distributions and their factors of warm temperate region ferns in Chiba PrefectureIn: M. Numata, ed., Flora of Chiba Prefecture p. 208–222. Biol. Soc. of Chiba Pref. Chiba (in Japanese).Google Scholar
  10. Sakai, A. 1975. Freezing resistance of evergreen and deciduous broad-leaf trees in Japan with special reference to their distributions. Jap. J. Ecol.25: 101–111 (in Japanese with English summary).Google Scholar
  11. Sato, T. 1982a. Distributional characteristics and habitats of pteridophytes native to Hokkaido. Research reports of Grant-in-Aid for special project of Hokkaido University, 1979–1981: 111–144 (in Japanese).Google Scholar
  12. — 1982b. Phenology and wintering capacity of sporophytes and gametophytes of ferns native to Northern Japan. Oecologia55: 53–61.CrossRefGoogle Scholar
  13. — 1983a. Freezing resistance of warm temperate ferns as related to their alternation of generations. Jap. J. Ecol.33: 27–35.Google Scholar
  14. — 1983b. Determination of the developmental age of sporophytes of some summer-green ferns in Hokkaido, Japan. Jap. J. Ecol.33: 161–167.Google Scholar
  15. — andA. Sakai. 1977. Distributional patternizations and characteristics of Japanese Pteridophyta. Low Temp. Sci. Ser. B35: 45–53 (in Japanese with English summary).Google Scholar
  16. —— 1980a. Phenological study of the leaf of Pterophyta in Hokkaido. Jap. J. Ecol.30: 369–375 (in Japanese wish English summary).Google Scholar
  17. ——. 1980b. Freezing resistance of gametophytes of the temperate fern,Polystichum retroso-paleaceum. Can. J. Bot.58: 1144–1148.CrossRefGoogle Scholar
  18. ——. 1981a. Cold tolerance of gametophytes and sporophytes of some cool temperature ferns native to Hokkaido. Can. J. Bot.59: 604–608.Google Scholar
  19. ——. 1981b. Freezing resistance of sporophytes of Pteridophyta in Hokkaido with special reference to their habitats. Jap. J. Ecol.31: 191–199 (in Japanese with English summary).Google Scholar
  20. Tagawa, M. 1959. Coloured illustrations of the Japanese Pteridophyta. Hoikusha, Osaka (in Japanese).Google Scholar
  21. Wagner, W.H., Jr. andA.J. Sharp. 1963. A remarkable reduced vascular plant in the United States. Science142: 1483–1484.PubMedGoogle Scholar
  22. Yokoi, Y. 1976a. Growth and reproduction in higher plants. I. Theoretical analysis by mathematical models. Bot. Mag. Tokyo89: 1–14.CrossRefGoogle Scholar
  23. — 1976b. Growth and reproduction in higher plants. II. Analytical study of growth and reproduction ofErythronium japonicum. Bot. Mag. Tokyo89: 15–31.CrossRefGoogle Scholar

Copyright information

© The Botanical Society of Japan 1984

Authors and Affiliations

  • Toshiyuki Sato
    • 1
  1. 1.The Institute of Low Temperature ScienceHokkaido UniversitySapporo

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