• Baker, H. G. (1972). Seed weight in relation to environmental conditions in California. Ecology 53, 9971010.
  • Bazzaz, F. A. (1979). The physiological ecology of plant succession. Annual Review of Ecology and Systematics 10, 351371.
  • Berendse, F. (1982). Competition between plant populations with different rooting depths. III. Field experiments. Oecologia 53, 5055.
  • Caldwell, M. M. (1987). Competition between root systems in natural communities. In: Root Development and Function (Ed. by P. J. Gregory, J. V.Lake & D. A.Rose), pp. 167185. Cambridge University Press, Cambridge .
  • Caldwell, M. M. & Richards, J. H. (1986). Competing root systems: morphology and models of absorption. In: On the Economy of Plant Form and Function (Ed. by T. J. Givnish), pp. 251273. Cambridge University Press, Cambridge .
  • Fitter, A. H. (1985). Functional significance of root morphology and root system architecture. In: Ecological Interactions in the Soil: Plants, Microbes and Animals (Ed. by A. H. Fitter), pp. 87106. Blackwell Scientific Publications, Oxford .
  • Fitter, A. H. (1987). An architectural approach to the comparative ecology of plant root systems. New Phytologist 106, 6177.
  • Fitter, A. H., Nichols, R. & Harvey, M. L. (1988). Root system architecture in relation to life history and nutrient supply. Functional Ecology 2, 345351.
  • Givnish, T. J., (Ed.) (1986). On the Economy of Plant Form and Function. Cambridge University Press, Cambridge .
  • Gleason, H. A. & Cronquist, A. (1963). Manual of Vascular Plants of Northeastern United States and Adjacent Canada. D. van Nostrand Co., Inc., Princeton , New Jersey .
  • Gleeson, S. K. & Tilman, D. (1990). Allocation and the transient dynamics of succession on poor soils. Ecology 71, 11441155.
  • Gross, K. L. & Werner, P. A. (1982). Colonizing abilities of ‘biennial’ plant species in relation to ground cover: implications for their distributions in a successional sere. Ecology 63, 921931.
  • Harris, G. A. & Wilson, A. M. (1970). Competition for moisture among seedlings of annual and perennial grasses as influenced by root elongation at low temperature. Ecology 51, 530534.
  • Horn, H. S. (1971). The Adaptive Geometry of Trees. Princeton University Press, Princeton , New Jersey .
  • Inouye, R. S., Huntly, N. J., Tilman, D., Tester, J. R., Stillwell, M. A. & Zinnel, K. C. (1987). Old-field succession on a Minnesota sand plain. Ecology 68, 1226.
  • Jackson, R. B. & Caldwell, M. M. (1989). The timing and degree of root proliferation in fertile-soil microsites for three cold desert perennials. Oecologia 81, 149153.
  • Jackson, R. B., Manwaring, J. H. & Caldwell, M. M. (1990). Rapid physiological adjustment of roots to localized soil enrichment. Nature 344, 5860.
  • Klepper, B. (1987). Origin, branching and distribution of roots systems. In: Root Development and Function (Ed. by P. J. Gregory, J. V.Lake & D. A.Rose), pp. 103124. Cambridge University Press, Cambridge .
  • Parrish, J. A. D. & Bazzaz, F. A. (1976). Underground niche separation in successional plants. Ecology 57, 12811288.
  • Sibly, R. M. & Grime, J. P. (1986). Strategies of resource capture by plants – evidence for adversity selection. Journal of Theoretical Biology 118, 247250.
  • Tilman, D. (1988). Plant Strategies and the Dynamics and Structure of Communities. Princeton University Press, Princeton , New Jersey .
  • Weiss, I. M. (1982). The effects of propagule size on germination and seedling growth in Mirabilis hirsuta. Canadian Journal of Botany 60, 18681874.