Abstract
How isolation affects primary succession remains unresolved. Our hypotheses are: 1) the rate of succession is slowed within 50 m from sources and 2) dominance increases more rapidly if the growing season is longer. We sampled lahar vegetation near conifer forests on Mount St. Helens 23 years after the eruption using transects (Muddy) and grids (Butte Camp, BC). Transects were compared to isolated plots of the same age, while grids were compared to vegetation that was 400 years older. Cover declined with distance and with elevation on the Muddy due to denser seed rain near forests and shorter growing seasons at higher elevation. On BC-1, next to a forest, richness measures increased with distance, while cover decreased with elevation. On BC-2, more exposed than BC-1, mean richness and cover declined with elevation, but increased towards seed sources. Equitability increased with distance and with elevation on more stressful transects and on BC-1. Percent similarity (PS), a measure of floristic heterogeneity, declined with elevation on Muddy-SW. BC-1 PS decreased with both distance and elevation. Data from grids collected since 1987 showed that both sites became more homogeneous through time. Directional changes on BC-1 were greater than on BC-2, while annual variation of DCA scores declined only on BC-2. These differences are related to conifer dominance patterns. Succession is influenced by isolation, which controls the seed rain, and by stress, which controls establishment, the rate of biomass accumulation, and the spread of immigrants. Although community development is governed by environmental factors, this study shows that the effects of dispersal that result from distance factors can persist and may be a source of unexplained variation in mature communities.
Similar content being viewed by others
References
Aarssen L.W. and Epp G.A. 1990. Neighbor manipulations in natural vegetation: A review. Journal of Vegetation Science 1: 13–30.
Analytical Software. 2001. Statistix7® for Windows. Analytical Software, Tallahassee, Florida, USA.
Belyea L.R. and Lancaster J. 1999. Assembly rules within a contingent ecology. Oikos 86: 402–416.
Borgegärd S.O. 1990. Vegetation development in abandoned gravel pits: effects of surrounding vegetation, substrate and regionally. Journal of Vegetation Science 1: 675–682.
Brunet J. and von Oheimb G. 1998. Migration of vascular plants to secondary woodlands in southern Sweden. Journal of Ecology 86: 429–438.
Bunting M.J. and Warner B.G. 1998. Hydroseral development in southern Ontario, patterns and controls. Journal of Biogeography 25: 3–18.
Butaye J., Jacquemyn H. and Hermy M. 2001. Differential colonization causing non-random forest plant community structure in a fragmented agricultural landscape. Ecography 24: 369–380.
Dale V.H., Swanson F.J. and Crisafulli C.M. 2004. Ecological recovery after the 1980 eruptions of Mount St. Helens. Springer-Verlag, New York, New York. (In press).
Davey M.C. and Rothery P. 1993. Primary colonization by microalgae in relation to spatial variation in edaphic factors on Antarctic fell field soils. Journal of Ecology 81: 335–344.
De Kovel C.G.F., Van Mierlo A.J.E.M., Wilms Y.J.O. and Berendse F. 2000. Carbon and nitrogen in soil and vegetation at sites differing in successional age. Plant Ecology 149: 43–50.
del Moral R. 1993. 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, UK, pp. 79–100
del Moral R. 1998. Early succession on lahars spawned by Mount St. Helens. American Journal of Botany 85: 820–828.
del Moral R. 1999. Plant succession on pumice at Mount St. Helens. 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. and Eckert A.J. 2004. Colonization of volcanic deserts from productive patches. American Journal of Botany. (In press).
del Moral R. and Grishin S.Y. 1999. Volcanic disturbances and ecosystem recovery.. In: Walker L.R. (ed.), Ecosystems of Disturbed Ground, Ecosystems of the World 16. Elsevier Publishers, Amsterdam, The Netherlands, pp. 137–160.
del Moral R. and Jones C.C. 2002. Vegetation development on pumice at Mount St. Helens, USA. Plant Ecology 162: 9–22.
del Moral R. and Wood D.M. 1988. Dynamics of herbaceous vegetation recovery on Mount St. Helens, Washington, USA, after a volcanic eruption. Vegetatio 47: 11–27.
del Moral R., Wood D.M. and Titus J.H.. 2004. Proximity, microsites, and biotic interactions during early primary succession.. In: Dale V.H., Swanson F.J. and Crisafulli C.M. (eds), Ecological Recovery After the 1980 Eruptions of Mount St. Helens, Ch. 7. Springer-Verlag, New York, New York. (In press).
Dlugosch K. and del Moral R. 1999. Vegetational heterogeneity along environmental gradients. Northwest Science 43: 12–18.
Eriksson O. and Eriksson A. 1998. Effects of arrival order and seed size on germination of grassland plants: Are there assembly rules during recruitment? Ecological Research 13: 229–239.
Facelli J.M. and D’Angela E. 1990. Directionality, convergence and the rate of change during early succession in the Inland Pampa, Argentina. Journal of Vegetation Science 1: 255–260.
Fastie C.L. 1995. Causes and ecosystem consequences of multiple pathways of primary succession at Glacier Bay, Alaska. Ecology 76: 1899–1916.
Foster B.L. and Tilman D. 2003. Seed limitation and the regulation of community structure in oak savanna grassland. Journal of Ecology 91: 999–1007.
Foxworthy B.L. and Hill M. 1982. Volcanic eruptions of 1980 at Mount St. Helens: the first 100 days. U.S. Geological Survey Professional Paper 1249, U.S. Government Printing Office, Washington, D.C.
Frelich L.E., Sugita S., Reich P.B., Davis M.B. and Friedman S.K. 1998. Neighbourhood effects in forests: implications for within stand patch structure. Journal of Ecology 86: 149–161.
Fridriksson S. and Magnusson B. 1992. Development of the ecosystem on Surtsey with reference to Anak Krakatau. Geo Journal 28: 287–291.
Fuller R.N. and del Moral R. 2003. The role of refugia and dispersal in primary succession on Mount St.Helens, Washington. Journal of Vegetation Science 14: 637–644.
Glenn-Lewin D.C. 1980. The individualistic nature of plant community development. Vegetatio 43: 141–146.
Halpern C.B. and Harmon M.E. 1983. Early plant succession on the Muddy River mudflow, Mount St.Helens, Washington. American Midland Naturalist 110: 97–106.
Hubbell R.P., Foster R.B., O’Brien S.T., Harms K.E., Condit R., Wechsler B., Wright S.J. and De Lao S.L. 1999. Light-gap disturbances, recruitment limitations, and tree diversity in a neotropical forest. Science 283: 554–557.
Inouye R.S. and Tilman D. 1995. Convergence and divergence of old-field vegetation after 11 yr of nitrogen addition. Ecology 76: 1872–1887.
Kahmen S. and Poschlod P. 2004. Plant functional trait responses to grassland succession over 25 years. Journal of Vegetation Science 15: 21–32.
Kazmierczak E., van der Maarel E. and Noest V. 1995. Plant communities in kettle-holes in central Poland: chance occurrence of species? Journal of Vegetation Science 6: 863–874.
Kitayama K. and Mueller-Dombois D. 1995. Vegetation changes along gradients of long-term soil development in the Hawaiian montane rainforest zone. Vegetatio 120: 1–20.
Kovach W.L. 1998. Multivariate statistical packages. Plus 3.1. Users’ Manual. 127 p.
Mathsoft 2001. Axum 7 for Windows user’s guide. Insightful Corporation, Seattle, Washington, USA.
McCune B. 1992. Components of error in predictions of species composition changes. Journal of Vegetation Science 3: 27–34.
McCune B. and Allen T.F.H. 1985. Will similar forests develop on similar sites? Canadian Journal of Botany 63: 367–376.
McCune B. and Mefford M.J. 1999. PC-ORD, multivariate analysis of ecological data, version 4.0. MjM Software Design, Gleneden Beach, OR, USA.
Makana J.R. and Thomas S.C. 2004. Dispersal limits natural recruitment of African mahoganies. Oikos 106: 67–72.
Malanson G.P. and Butler D.R. 1991. Floristic variation among gravel bars in a subalpine river, Montana, USA. Arctic and Alpine Research 23: 273–278.
Martínez M.L., Vázquez G. and Sánchez Colón S. 2001. Spatial and temporal variability during primary succession on tropical coastal sand dunes. Journal of Vegetation Science 12: 361–372.
Matlack G.R. 1994a. Vegetation dynamics of the forest edge-trends in space and successional time. Journal of Ecology 82: 113–123.
Matlack G.R. 1994b. Plant species migration in a mixed-history forest landscape in eastern North America. Ecology 75: 1491–1502.
Primack R.B. and Miao S.L. 1992. Dispersal can limit local plant distribution. Conservation Biology 6: 513–519.
Roozen J.M. and Westhoff V. 1985. A study of long-term salt-marsh succession using permanent plots. Vegetatio 61: 23–32.Rydin H. and Borgegård S.O. 1991. Plant characteristics over a century of primary succession on islands, Lake Hjälmaren. Ecology 72: 1089–1101.
Savage M., Sawhill B. and Askenazi B. 2000. Community dynamics: what happens when we rerun the tape? Journal of Theoretical Biology 205: 515–526.
Sekora K.V., van den Bogert J.C.J.M. and Berendse F. 2004. Changes in soil and vegetation during dune slack succession. Journal of Vegetation Science 15: 209–218.
Tagawa H. 1992. Primary succession and the effect of first arrivals on subsequent development of forest types. GeoJournal 28: 175–183.
Tilman D. 1997. Community invisibility, recruitment limitation, and grassland biodiversity. Ecology 78: 81–92.
Tofts R. and Silverton J. 2002. Community assembly from the local species pool: an experimental study using congeneric species pairs. Journal of Ecology 90: 385–393.
Verheyen K., Guntenspergen G.R., Biesbrouck B. and Henry M. 2003. An integrated analysis of the effects of past land use on forest herb colonization at the landscape scale. Journal of Ecology 91: 731–742.
Walker L.R. and del Moral R. 2003. Primary succession and ecosystem rehabilitation. Cambridge University Press, Cambridge, UK.
Ward S.A. and Thornton I.W.B. 2000. Chance and determinism in the development of isolated communities. Global Ecology and Biogeography 9: 7–18.
Weiher E. and Keddy P. 1999. Ecological assembly rules: perspectives, advances, retreats. Cambridge University Press, Cambridge, UK.
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.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
del Moral, R., Ellis, E.E. Gradients in compositional variation on lahars, Mount St. Helens, Washington, USA. Plant Ecol 175, 273–286 (2005). https://doi.org/10.1007/s11258-005-0752-y
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s11258-005-0752-y