Abstract
This study tests whether variability in a life history trait such as emergence time has ecological and evolutionary significance in seasonal environments due to their relationship with fitness components. The population dynamics of nine different cohorts of seedlings emergence were analyzed in a natural population of the annual herb Tagetes micrantha Cav. (Asteraceae). Temporal variation in seedling emergence was related to the pattern of precipitation, while spatial variation could be related to topographical heterogeneity. Plants that emerged at the beginning of the season (early germination) had lower probabilities of survivorship than those that emerged at the end of the season (late germination). In contrast, plants that emerged early had, on average, higher fecundity than those that emerged late. The net result of these contrasting patterns of survival and fecundity constitute a life history trade-off in T. micrantha.
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References
Abul-Fatih, H. & Bazzaz, F. 1979. The biology of Ambrosia trifida L. II. Germination, emergence, growth and survival. New Phytol. 83: 817–827.
Arthur, A., Gale, S. & Lawrence, M. 1973. Variation in wild populations of Papaver dubium. VII. Germination time. Heredity 30: 189–197.
Baskin, C. & Baskin, J. 1988. Germination ecophysiology of herbaceous plant species in a temperate region. Am. J. Bot. 75: 286–305.
Baskin, J. & Baskin, C. 1972. Influence of germination date on survival and seed production in a population of Leavenworthia stylosa. Am. Midland Nat. 88: 318–323.
Baskin, J. & Baskin, C. 1985. The light requirements for germination of Aster pilosous seeds: temporal aspects and ecological consequences. J. Ecol. 73: 765–773.
Bradshaw, A. 1984. The importance of evolutionary ideas in ecology and vice versa. Pp. 1–21. In: Shorrocks, B. S. (ed.), Evolutionary Ecology. Blackwell Sci. Publ. Oxford, U.K.
Cabrales-Vargas, R. A. 1991. Demografía e historia natural de Datura stramonium L. en el Pedregal de San Angel. Unpubl. B. Sc. Thesis, National University of Mexico, UNAM, Mexico.
Cruden, R. W. 1974. The Adaptive nature of seed germination in Nemophila menziesii Aggr. Ecology. 55: 1295–1305.
Deevey, E. 1947. Life tables for natural populations of animals. Quart. Rev. Biol. 22: 283–314.
Domínguez, C. A. & Dirzo, R. 1995. Rainfall and flowering synchrony in a tropical shrub: variable selection on the flowering time of Erythroxylum havanense. Evol. Ecol. 9: 204–216.
García, E. 1988. Modificaciones al sistema de clasificació n de Köppen. Instituto de Geografía, UNAM, Mexico.
Harper, J. 1977. Population Biology of Plants. Academic Press, London.
Healy, M. J. R. 1988. Glim: an introduction. Oxford Sci. Publications. Oxford University Press. Oxford, U.K.
Hedrick, P. W. 1986. Genetic polymorphism in heterogeneous environments: A decade later. Ann. Rev. Ecol. Syst. 17: 535–566.
Kalisz, S. 1986. Variable selection on the timing germination in Collinsia verna (Scrophulariaceae). Evolution 40: 479–491.
Leó n, J. 1985. Germination strategies. Pp. 129–142. In: Greenwood, P., Harvey, P. H. & Slatkin, M. (eds), Evolution. Essays in honour of John Maynard Smith. Cambridge University Press, Cambridge, U.K.
Marks, M. & Price, S. 1981. Influence of germination data on survival and fecundity in wild lettuce Lactuca serriola. Oikos 36: 326–330.
Molina, F. 1986. Dinámica de poblaciones de malezas en cultivo de maíz de temporal del Valle de México. Unpubl. M. Sc. Thesis, National University of Mexico, UNAM, Mexico.
Morales, E. 1986. Variació n intraespecífica en la demografía de Heterosperma pinnatum, una especie con aquenios polimó rfícos. Unpubl. B. Sc. Thesis, National University of Mexico, UNAM, Mexico.
Mosseau, T. A., Sinervo, B. & Endler, J. 2000. Adaptive Genetic Variation in the Wild. Oxford University Press, London, New York.
Newman, E. I. 1963. Factors controlling the germination date of winter annuals. J. Ecol. 51: 625–638.
Nú ñ ez-Farfán, J., Cabrales-Vargas, R.A. & J.A. González-Astorga. 1994. Estudios de biología evolutiva en plantas herbáceas del Pedregal de San Angel. Pp. 157–173. In: Rojo, A. (ed.), Ecología e Historia Natural de la Reserva del Pedregal de San Angel. UNAM, México, D.F.
Philippi, T. 1993. Bet-hedging germination of desert annuals: variation among populations and maternal effects in Lepidium lasiocarpum. Am. Nat. 142: 488-507.
Pielou, E. 1977. Mathematical Ecology. John Wiley & Sons, New York, USA.
Rice, W. R. 1989. Analyzing tables of statistical tests. Evolution 43: 223-225.
Rzedowski, J. 1954. Vegetació n del Pedregal de San Angel. An. Esc. Nac. Cien. Biol. IPN, Mexico, 8: 59–129.
Rzedowski, J & Rzedowski, G. C. 1985. Flora Fanerogámica del Valle de México. Vol. 2 Publ. 15. Instituto de Ecología, A. C. México D. F.
Schlichting, C. D. 1986. The evolution of phenotypic plasticity in plants. Ann. Rev. Ecol. Syst. 17: 667–693.
Schlichting, C. D. & Pigliucci, M. 1998. Phenotypic Evolution. A Reaction Norm Perspective. Sinauer Associates, Inc., Publishers. Sunderland, MA, USA.
Silvertown, J. & Lovett Doust, J. 1993. Introduction to plant population biology, Blackwell Sci. Publ., Oxford, UK.
Smith, R. 1996. Ecology and field biology. Fifth ed., Harper Collins Collage Publishers, New York, USA.
Sokal, R. & J. Rohlf. 1995. Biometry, third ed. W. H. Freeman & Company, New York, USA.
Stearns, S. 1977. The evolution of life history traits: a critique of theory and review of the data. Ann. Rev. Ecol. Syst. 8: 145–171.
Stearns, S. 1992. The evolution of life histories. Oxford University Press, Oxford, UK.
Stratton, D. A. 1994. Genotype-by-environment interactions for fitness of Erigeron annuus show fine-scale selective heterogeneity. Evolution 48: 1607–1618.
Sultan, S. E. 1987. Evolutionary implications of phenotypic plasticity in plants. Evol. Biol. 21: 127–176.
Symonides, E. 1987. Population dynamics of annual plants. Pp. 221–248. In: Davy, A. J., Hutchings, M. J. & Watkinson, A. R. (eds), Plant population ecology. Blackwell Sci. Publ. Oxford, UK.
Underwood, A. J. 1997. Experiments in ecology. Their logical design and interpretation using analysis of variance. Cambridge University Press, Cambridge, UK.
Venable, D. L. 1984. Using intraspecific variation to study the ecological significance and evolution plants. Pp. 166–187. In: Dirzo, R. & Sarukhán, J. (eds), Perspectives on plant population biology. Sinauer Associates, Inc., Publishers. Sunderland, MA, USA.
Venable, D. L., Bú rquez, A., Corral, G., Morales, E. & Espinosa, F. 1987. The ecology of seed heteromorphism in Heterosperma pinnatum in central Mexico. Ecology 68: 65–76.
Watkinson, A. 1981. The population ecology of winter annuals. Pp. 253–264. In: Synge, H. (ed.), The biological aspects of rare plant conservation. Wiley, Chichester, UK.
Zar, J. 1999. Biostatistical analysis, fourth edition. Prentice Hall, New Jersey, USA.
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González-Astorga, J., Núñez-Farfán, J. Variable demography in relation to germination time in the annual plant Tagetes micrantha Cav. (Asteraceae). Plant Ecology 151, 253–259 (2000). https://doi.org/10.1023/A:1026570623406
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DOI: https://doi.org/10.1023/A:1026570623406