Analytical Software 1994. Statistix 4.1 User's Manual. Analytical Software, Tallahassee, FL.
Allen L.J.S., Allen E.J., Kunst C.R.G. and Sosebee R.E. 1991. A diffusion model for dispersal of Opuntia imbricata (cholla) on rangeland. Journal of Ecology 79: 1123–1135.
Bakker J.P., Olff H., Willems J.H. and Zobel M. 1996. Why do we need permanent plots in the study of long-term vegetation dynamics. Journal of Vegetation Science 7: 147–155.
Belyea L.R. and Lancaster J. 1999. Assembly rules within a contingent ecology. Oikos 86: 402–416.
Bishop J.G. and Schemske D.W. 1998. Variation in flowering phenology and its consequences for lupines colonizing Mount St. Helens. Ecology 79: 534–546.
Blundon D.J., MacIsaac D.A. and Dale M.R.T. 1993. Nucleation during primary succession in the Canadian Rockies. Canadian Journal of Botany 71: 1093–1096.
Borgegärd S.O. 1990. Vegetation development in abandoned gravel pits: effects of surrounding vegetation, substrate and regionally. Journal of Vegetation Science 1: 675–682.
Chesson P.L. and Case T.J. 1986. Overview: Nonequilibrium community theories: chance, variability, history and coexistence. In: Diamond J. and Case T.J. (eds), Community Ecology. Harper and Row, New York, pp. 229–239.
Christensen N.L. and Peet R.K. 1984. Convergence during secondary forest succession. Journal of Ecology 72: 25–36.
Debussche M. and Lepart J. 1992. Establishment of woody plants in Mediterranean old fields: opportunity in space and time. Landscape Ecology 6: 133–145.
del Moral R. 1993a. Mechanisms of primary succession on volcanoes: a view from Mount St. Helens. In: Miles J. and Walton D.H. (eds), Primary Succession on Land. Blackwell Scientific Publications, London, pp. 79–100.
del Moral R. 1993b. Understanding dynamics of early succession on Mount St. Helens. Journal of Vegetation Science 4: 223–234.
del Moral R. 1998. Early succession on lahars spawned by Mount St. Helens. American Journal of Botany 85: 820–828.
del Moral R. 1999a. Plant succession on pumice at Mount St. Helens, Washington. American Midland Naturalist 141: 101–114.
del Moral R. 2000. Succession and species turnover on Mount St. Helens, Washington. Acta Phytogeographica Suecica 85: 53–62.
del Moral R. 1999b. Predictability of primary successional wetlands on pumice, Mount St. Helens. Madroño 47: 177–186.
del Moral R. and Bliss L.C. 1993. Mechanisms of primary succession: insights resulting from the eruption of Mount St. Helens. Advances in Ecological Research 24: 1–66.
del Moral R., Titus J.H. and Cook A.M. 1995. Early primary succession on Mount St. Helens, Washington, USA. Journal of Vegetation Science 6: 107–120.
del Moral R. and Wood D.M. 1988a. Dynamics of herbaceous vegetation recovery on Mount St. Helens, Washington, USA, after a volcanic eruption. Vegetatio 74: 11–27.
del Moral R. and Wood D.M. 1988b. The high elevation flora of Mount St. Helens. Madroño 35: 309–319.
del Moral R. and Wood D.M. 1993. Early primary succession on a barren volcanic plain at Mount St. Helens, Washington. American Journal of Botany 80: 981–992.
Dlugosch K. and del Moral R. 1999. Vegetational heterogeneity along elevational gradients. Northwest Science 73: 12–18.
Edwards J.S. and Sugg P. 1993. Arthropod fallout as a resource in the recolonization of Mount St. Helens. Ecology 74: 954–958.
Fagan W.F. and Bishop J.G. 2000. Trophic interactions during primary succession: herbivores slow a plant reinvasion at Mount St. Helens. American Naturalist 155: 238–251.
Fuller R.N. 1999. The Role of Refugia in Primary Succession on Mount St. Helens, Washington.
Halvorson J.J. and Smith J.L. 1995. Decomposition of lupine biomass by soil microorganisms in developing Mount St. Helens' pyroclastic soils. Soil Biology & Biochemistry 27: 983–992.
Hill M.O. and Gauch H.G. 1980. Detrended correspondence analysis, an improved ordination technique. Vegetatio 42: 47–58.
Inouye R.S. and Tilman D. 1995. Convergence and divergence of old-field vegetation after 11 year nitrogen addition. Ecology 76: 1872–1887.
Kent M. and Coker P. 1992. Vegetation Description and Analysis. Wiley & Sons, New York.
Kovach W.L. 1998. MVSP-a multivariate statistical package for Windows, version 3.1. Kovach Computing Services, Pentraeth, Wales, UK.
Larson D.R. and Bliss L.C. 1998. An analysis of structure of tree seedling populations on a lahar. Landscape Ecology 13: 307–322.
Lockwood J.L. 1997. An alternative to succession. Restoration & Management Notes 15: 45–50.
McCune B. and Mefford M.J. 1997. PC-ORD, multivariate analysis of ecological data, version 3.0. MjM Software Design, Gleneden Beach, OR, USA.
Moreno-Casasola P. and Vázquez G. 1999. The relationship between vegetation dynamics and water table in tropical dune slacks. Journal of Vegetation Science 10: 515–524.
Myster R.W. and Pickett S.T.A. 1990. Initial conditions, history and successional pathways in ten contrasting old fields. American Midland Naturalist 124: 231–238.
Myster R.W. and Pickett S.T.A. 1994. A comparison of succession over 18 years in 10 contrasting old fields. Ecology 75: 387–392.
Salonen V., Penttinen A. and Sarkka A. 1992. Plant colonization of a bare peat surface: population changes and spatial patterns. Journal of Vegetation Science 3: 113–118.
Samuels C.L. and Drake J.A. 1997. Divergent perspectives on community convergence. Trends in Ecology & Evolution 12: 427–432.
Sterling A., Peco B., Casado M.A., Galiano E.F. and Pineda F.D. 1984. Influence of microtopography on floristic variation in the ecological succession in grassland. Oikos 42: 334–342.
Sugg P.M. and Edwards J.S. 1998. Pioneer aeolian community development on pyroclastic flows after the eruption of Mount St. Helens, Washington, USA. Arctic and Alpine Research 30: 400–407.
Titus J.H. and del Moral R. 1998. Seedling establishment in different microsites on Mount St. Helens, Washington, USA. Plant Ecology 134: 13–26.
Titus J.H., Moore S., Arnot M. and Titus P.J. 1998. Inventory of the vascular flora of the blast zone, Mount St. Helens, Washington. Madroño 45: 145–161.
Titus J.H., Titus P.J. and del Moral R. 1999. Wetland development in primary and secondary successional substrates fourteen years after the eruption of Mount St. Helens, Washington, USA. Northwest Science 73: 186–204.
van der Walk A.G. 1992. Establishment, colonization and persistence. In: Glenn-Lewin D.C., Peet R.K. and Veblen T.T. (eds), Plant Succession: Theory and Prediction. Chapman & Hall, London, pp. 60–102.
Vitt D.H., Marsh J.E. and Bovey R.B. 1988. Mosses, Lichens and Ferns of Northwest North America. University of Washington Press, Seattle.
Wiegleb G. and Felinks B. 2000. Predictability of primary succession in former lignite coal mining areas. Journal of Applied Vegetation Science 3 (in press).
Wood D.M. and del Moral R. 1987. Mechanisms of early primary succession in subalpine habitats on Mount St. Helens. Ecology 68: 780–790.
Wood D.M. and del Moral R. 1988. Colonizing plants on the Pumice Plains, Mount St. Helens, Washington. American Journal of Botany 75: 1228–1237.
Wood D.M. and del Moral R. 2000. Seed rain during early primary succession on Mount St. Helens, Washington. Madroño 47: 1–9.
Zar J.H. 1996. Biostatistical Analysis. 3rd edn. Prentice Hall, Upper Saddle River, NJ.