Abstract
A reformulation of the continuum concept is presented after considering the implications of the community/continuum controversy and current niche theory. Community is a spatial concept dependent on landscape pattern while the continuum is an environmental concept referring to an abstract space. When applying niche theory to plants, the mechanisms of competition are ill-defined and the assumption of bell-shaped response curves for species unrealistic.
Eight testable propositions on the pattern of response of vegetation to environmental gradients are presented 1. Environmental gradients are of two types. a) resource gradients or b) direct physiological gradients. 2. The fundamental niche response of species to resource gradients is a series of similar nested response curves. 3. The fundamental niche response of species to direct gradients is a series of separate, independent, overlapping response curves. 4. Species fundamental response curves are such that they have a relative performance advantage in some part of the environmental space. 5. The shape of the realized niche is variable even bimodal but predictable from the fundamental response given the other species present. Propositions 6–8 describe the response shapes of emergent community properties to environmental gradient; species richness is bimodal, dominance trimodal and standing crop unimodal. Detailed comparisons of these propositions are made with the alternative theories of Ellenberg, Gauch and Whittaker, Grime, and Tilman. These theories are incomplete lacking several generally accepted properties of plants and vegetation.
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References
AustinM. P. 1980. Searching for a model for use in vegetation analysis. Vegetatio 42: 11–21.
AustinM. P. 1982. Use of a relative physiological performance value in the prediction of performance in multispecies mixtures from monoculture performance. J. Ecol. 70: 559–570.
AustinM. P. 1985. Continuum concept, ordination methods, and niche theory. Ann. Rev. Ecol. Syst. 16: 39–61.
AustinM. P. 1986. The theoretical basis of vegetation science. TREE 1: 161–164.
AustinM. P. 1987. Models for analysis of species' response to environmental gradients. Vegetatio 69: 35–45.
Austin, M. P. in press. Community theory and competition in vegetation. In: Tilman, D. & Grace, J. B. (eds), Perspectives in plant competition, Academic Press, London.
AustinM. P. & AustinB. O. 1980. Behaviour of experimental plant communities along a nutrient gradient. J. Ecol. 68: 891–918.
AustinM. P., GrovesR. H., FrescoL. M. F. & KayeP. E. 1985. Relative growth of six thistle species along a nutrient gradient with multispecies competition. J. Ecol. 73: 667–684.
BazzazF. A. 1979. The physiological ecology of plant succession. Ann. Rev. Ecol. Syst. 10: 351–371.
BradshawA. D., ChadwickM. J., JowettD. & SnaydonR. W. 1964. Experimental investigations into the mineral nutrition of several grass species IV Nitrogen level. J. Ecol. 52: 665–676.
BrownJ. M. 1981. Two decades of homage to Santa Rosalia: toward a general theory of diversity. Amer. Zool. 21: 877–888.
BryantJ. P., ChapinIIIF. S. & KleinD. R. 1983. Carbon/nutrient balance of boreal plants in relation to vertebrate herbivory. Oikos 40: 357–368.
ChapinF. S. 1980. The mineral nutrition of wild plants. Ann. Rev. Ecol. Syst. 11: 233–260.
CottamG. & McIntoshR. P. 1966. Vegetation continuum. Science 152: 546–547.
DaubenmireR., 1966. Vegetation: identification of typical communities. Science 151: 291–298.
EllenbergH., 1953. Physiologisches und ökologisches Verhalten derselben Pflanzenarten. Ber. Deutsch. Bot. Ges. 65: 351–62.
EllenbergH. 1954. Uber einige Fortschritte der kausalen Vegetationskunde. Vegetatio 5/6: 199–211.
EllenbergH. 1988. Vegetation ecology of central Europe. 4th. ed; Cambridge University Press. Cambridge.
GauchH. G. & WhittakerR. H. 1972. Coenocline simulation. Ecology 53: 446–51.
GaudetC. L. & KeddyP. A. 1988. A comparative approach to predicting competitive ability from plant traits. Nature 334: 242–243.
GillerP. S. 1984. Community structure and the niche Chapman & Hall, London.
GleasonH. A. 1926. The individualistic concept of the plant association. Bull. Torrey Bot. Club 53: 1–20.
GoodallD. W. 1963. The continuum and the individualistic association. Vegetatio 11: 297–316.
GraceJ. B. 1988. The effects of plant age on the ability to predict mixture performance from monoculture growth. J. Ecol. 76: 152–156.
GrimeJ. P. 1973. Control of species density in herbaceous vegetation. J. Envir. Manage. 1: 151–167.
GrimeJ. P. 1977. Evidence for the existence of three primary strategies in plants and its relevance to ecological and evolutionary theory. Amer. Nat. 111: 1169–1194.
GrimeJ. P. 1979. Plant strategies and vegetation processes. J. Wiley & Sons, Chichester.
GrubbP. J. 1987. Global trends in species richness in terrestrial vegetation: a view from the northern hemisphere. In: GeeJ. M. R. & GillerP. S. (eds), Organisation of communities past and present. Blackwell, Oxford.
HustonM. 1979. A general hypothesis of species diversity. Amer. Nat. 113: 81–101.
HustonM. & SmithT. M. 1987. Plant succession: Life history and competition. Amer. Nat. 130: 160–198.
MacIntoshR. P. 1967. The continuum concept of vegetation. Bot. Rev. 33: 130–187.
MargulesC. R., NichollsA. O. & AustinM. P. 1987. Diversity of Eucalyptus species predicted by a multi-variable environmental gradient. Oecologia 71: 229–232.
MinchinP. 1989. Montane vegetation of the Mt. Field Massif, Tasmania: a test of some hypotheses about properties of community patterns. Vegetatio 83: 97–110.
Mueller-DomboisD. & EllenbergH. 1974. Aims and methods of vegetation ecology. J. Wiley & Sons, New York.
OriansG. H. & SolbrigO. T. 1977. A cost-income model of leaves and roots with special reference to arid and semiarid areas. Amer. Nat. 111: 677–690.
ParsonsR. F. 1968. The significance of growth-rate comparisons for plant ecology. Amer. Nat. 102: 295–297.
PrenticeI. C. & van derMaarelE. (eds), 1987. Theory and models in vegetation science. Vegetation 69. Junk, Dordrecht.
RussellE. W. 1973. Soil conditions and plant growth. Longmans, London.
SmithT. M. & HustonM. 1989. A functional classification of plant types: linking spatial and temporal pattern in plant communities. Vegetatio 83: 49–69.
TilmanD. 1982. Resource competition and community structure. Princeton Univ. Press, Princeton.
TilmanD. 1987. Secondary succession and the pattern of plant dominance along experimental nitrogen gradients. Ecol. Monogr. 57: 189–214.
TilmanD. 1988. Plant strategies and the structure and dynamics of plant communities. Princeton Univ. press, Princeton.
WesthoffV. & van derMaarelE. 1978. The Braun-Blanquet approach. In: WhittakerR. H. (ed.), Classification of plant communities', Junk, The Hague.
WhittakerR. H. 1967. Gradient analysis of vegetation. Biol. Rev. 42: 207–264.
WhittakerR. H. (ed.) 1978. Ordination of plant communities. Junk, The Hague.
WilsonS. D. & KeddyP. A. 1985. Plant zonation on a shoreline gradient: physiological response curves of component species. J. Ecol. 73: 851–860.
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Austin, M.P., Smith, T.M. A new model for the continuum concept. Vegetatio 83, 35–47 (1989). https://doi.org/10.1007/BF00031679
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DOI: https://doi.org/10.1007/BF00031679