Oecologia

, Volume 92, Issue 2, pp 250–256

Leaf production, reproductive patterns, field germination and seedling survival in Chamaedorea bartlingiana, a dioecious understory palm

  • Michele Ataroff
  • Teresa Schwarzkopf
Original Papers

Summary

Chamaedorea bartlingiana is a dioecious palm that grows in the cloud forest understories of the Venezuelan Andes. Age and sexual differences in phenology and reproductive patterns were studied in labelled individuals of all age categories. This species has long-lived leaves and low leaf production, both characteristic of understory plants. Growth rates are lower in juveniles than in adults and in females than in males, as in other palms. Male and female individuals show different reproductive patterns. Male inflorescences are always produced at the same rate and the probability of surviving until anthesis is constant. Females produce reproductive buds at the same rate as males, but these buds have a 35% probability of becoming a ripe infrutescence if the plant has infrutescences already growing, and 70% if it does not. This pattern and the slow growth of inflorescences (1 year for males from bud to flowers, 2 years for females from bud to ripe fruits) cause a pluriannual reproductive pattern at the population level. Field germination does not follow this pattern, but shows one annual peak probably related to environmental conditions.

Key words

Chamaedorea bartlingiana Dioecy Vegetative phenology Reproductive phenology Seedlings 

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References

  1. Alliende MC (1989) Demographic studies of a dioecious tree. II. The distribution of leaf predation within and between trees. J Ecol 77:1048–1058Google Scholar
  2. Bawa KS (1980) Evolution of dioecy in flowering plants. Annu Rev Ecol Syst 11:15–39Google Scholar
  3. Bentley BL (1979) Longevity of individual leaves in a tropical rainforest understory. Ann Bot 43:119–121Google Scholar
  4. Clark DB, Clark DA (1988) Leaf production and the cost of reproduction in the Neotropical rain-forest Cycad, Zamia skinneri. J Ecol 76:1153–1163Google Scholar
  5. Chabot BF, Hicks DJ (1982) The ecology of leaf life spans. Annu Rev Ecol Syst 13:229–259Google Scholar
  6. Chazdon RL (1986a) Light variation and carbon gain in rain forest understory palms. J Ecol 74:995–1012Google Scholar
  7. Chazdon RL (1986b) Physiological and morphological basis of shade tolerance in rain forest understory palms. Principes 30:92–99Google Scholar
  8. Dawson TE, Bliss LC (1989) Patterns of water use and the tissue water relations in the dioecious shrub, Salix arctica: the physiological basis for habitat partitioning between the sexes. Oecologia 79:332–343Google Scholar
  9. De Steven D, Windsor DM, Putz FE, De Leon B (1987) Vegetative and reproductive phenologies of a palm assemblage in Panama. Biotropica 19:342–356Google Scholar
  10. Garwood NC (1983) Seed germination in a seasonal tropical forest in Panama: a community study. Ecol Monogr 53:159–181Google Scholar
  11. Garwood NC (1986) Constraints on the timing of seed germination in a tropical forest. In: Estrada A, Flemming TH (eds) Frugivores and Seed Dispersal. Dr. W. Junk Publ, DordrechtGoogle Scholar
  12. Givnish T (1980) Ecological constrains on the evolution of breeding systems in seed plants: dioecy and dispersal in gymnosperms. Evolution 34:959–972Google Scholar
  13. Grubb PJ, Whitmore TC (1966) A comparison of montane and lowland rain forest in Ecuador. II. The climate and its effects on the forests. J Ecol 54:303–333Google Scholar
  14. Huber O (1986) Las selvas nubladas de Rancho Grande: Observaciones sobre su fisionomía, estructura y fenología. In: Huber O (ed) La Selva Nublada de Rancho Grande, Parque Nacional Henri Pittier. Fondo Ed. Acta Cientifica Venezolana, Caracas, pp 131–170Google Scholar
  15. Jing SW, Coley PD (1990) Dioecy and herbivory: The effect of growth rate on plant defense in Acer negundo. Oikos 58:369–877Google Scholar
  16. Kikuzawa K (1989) Ecology and evolution of phenological pattern, leaf longevity and leaf habit. Evol Trends Plant 3:105–110Google Scholar
  17. Krischik VA, Denno RF (1990a) Differences in environmental response between the sexes of the dioecious shrub Baccharis halimifolia (Compositae). Oecologia 83:179–181Google Scholar
  18. Krischik VA, Denno RF (1990b) Patterns of growth, reproduction, defense, and herbivory in the dioecious shrub Baccharis halimifolia (Compositae). Oecologia 83:182–190Google Scholar
  19. Maze KM, Whalley RDB (1990) Resource allocation patterns in Spinifex sericeus R Br. a dioecious perennial grass of coastal sand dunes. Aust J Ecol 15:145–153Google Scholar
  20. Opler PA, Frankie GW, Baker HG (1980) Comparative phenological studies of treelet and shrub species in tropical wet and dry forests in the lowlands of Costa Rica. J Ecol 68:167–188Google Scholar
  21. Oyama K (1990) Variation in growth and reproduction in the neotropical dioecious palm Chamaedorea tepejilote. J Ecol 78:648–663Google Scholar
  22. Sarmiento G, Monasterio M, Azocar A, Castellano E, Silva JF (1971) Vegetación Natural. Estudio Integral de la Cuenca de los Ríos Chama y Capazón, Facultad de Ciencias Forestales, Universidad de Los Andes, MéridaGoogle Scholar
  23. Schwarzkopf T (1985) Patrones de distribución en plantas del sotobosque de una selva nublada. Tesis de Grado. Facultad de Ciencias, Universidad de Los Andes, MéridaGoogle Scholar
  24. Soriano P (1983) La comunidad de quirópteros de las selvas nubladas de los Andes de Mérida. Patrón reproductivo de los frugivoros y las estrategias fenológicas de las plantas. Tesis Magister Scientiae, Facultad de Ciencias, Universidad de Los Andes, Mérida, VenezuelaGoogle Scholar
  25. Stratton DA (1989) Longevity of individual flowers in a Costa Rican cloud forest: ecological correlates and phylogenetic constraints. Biotropica 21:308–318Google Scholar

Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Michele Ataroff
    • 1
  • Teresa Schwarzkopf
    • 1
  1. 1.Centro de Investigaciones Ecológicas de Los Andes Tropicales (CIELAT), Fac. CienciasUniversidad de Los AndesMéridaVenezuela

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