Summary
Two concepts of vegetation function and organization are examined in this paper. The first concerns the possible relationship between energy acquisition and species dominance in a given growth form and vegetation type. The second questions whether homeostatic mechanisms operate at sufficient levels to yield similar and positive photosynthetic performance of evergreen shrubs across a marked environmental and geographical gradient in southern California. This gradient runs from the coast at 135 m to 1,435 m in the mountains and on to 1,150 m at the margin of the desert transition.
Total photosynthesis in several species was estimated at each site from late spring through summer. Within a common growth form, species success correlated with photosynthetic capacity. The species with the greatest carbon uptake were best represented in the vegetation. This relationship would not be expected to hold either between widely differing growth forms or where other factors exclude or decrease the abundance or productivity of certain of the species.
Across the gradient examined, species displayed a marked degree of photosynthetic homeostasis despite marked environmental changes. For example, photosynthetic uptake in Adenostoma fasciculatum varied by only 32% between the greatest and least productive areas despite large differences in precipitation and temperature. In most cases there was a strong correspondence between cover and photosynthesis across the transect studied.
From the available data, the transitions from chaparral to coastal sage, montane forests, or desert transition vegetation do not appear to result from sharp suppression of photosynthetic uptake at these borders. Other factors such as those affecting germination and establishment may be responsible for these transitions. However, further investigations are required at the edges of species distribution to adequately describe the pattern that does exist and to ascertain the relationship between energy capture and species success in these areas.
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References
Aschmann, H.: Distribution and peculiarity of Mediterranean type ecosystems. In: Mediterraneantype ecosystems: Origin and structure (F. di Castri and H.A. Mooney, eds.), pp. 11–19. Berlin-Heidelberg-New York: Springer 1973
Billings, W.D., Godfrey, P.J., Chabot, B.F., Bourgue, D.P.: Metabolic acclimation to temperature in arctic and alpine ecotypes of Oxyria digyna. Arct. Alp. Res. 3, 277–289 (1971)
Elford, C.R.: The climate of California. In: Climates of the states, Vol. II, pp. 538–594. New York: Water Information Center 1970
Hanes, T.L.: Ecological studies in closely related chaparral shrubs in southern California. Ecol. Monogr. 35, 213–235 (1965)
Hanes, T.L.: Succession after fire in the chaparral of southern California. Ecol. Monogr. 41, 27–52 (1971)
Harrison, A.T., Small, E., Mooney, H.A.: The drought relationships and distribution of two Mediterranean-climate California plant communities. Ecology 52, 869–875 (1971)
Hellmuth, E.O.: Eco-physiological studies on plants in arid and semi-arid regions in Western Australia. III. Comparative studies on photosynthesis, respiration and water relations of ten arid zone and two semi-arid zone plants under winter and late summer climatic conditions. J. Ecol. 59, 225–259 (1971)
Krause, D.A., Kummerow, J.: Xeromorphic structure and soil moisture in the chaparral. Oecol. plant. 12, 133–148 (1977)
List, R.J.: Smithsonian meterological tables. Washington, D.C.: Smithsonian Institution Press (1971)
Miller, P.C.: Resource utilization and production processes. Paper presented at the third annual symposium on analysis of ecological systems. Columbus, Ohio: Ohio State University (1976)
Miller, P.C.: Quantitative plant ecology. In: Analysis of ecosystems (D. Horn, G.R. Stairs, R.D. Mitchell, eds.), pp. 179–231. Columbus, Ohio: Ohio State University Press 1978
Miller, P.C., Bradbury, D.E., Hajek, E., LaMarche, V., Thrower, N.J.: Past and present environment. In: Convergent evolution in Chile and California: Mediterranean climate ecosystems (H.A. Mooney, ed.), p. 27–72. Stroudsburg, Penn.: Dowden, Hutchinson and Ross, Inc. 1977
Miller, P.C., Mooney, H.A.: The origin and structure of American arid-zone ecosystems. The producers: Interactions between environment, form, and function. In: Proceedings of the First International Congress of Ecology, p. 201–209. The Hague, Netherlands (1974)
Mooney, H.A.: The carbon balance of plants. Ann. Rev. Ecol. and Systematics 3, 315–346 (1972)
Mooney H.A., Dunn, E.L.: Photosynthetic systems of Mediterranean climate shrubs and trees of California and Chile. Am. Nat. 104, 447–453 (1970)
Mooney, H.A., Gulmon, S.L., Parsons, D.J., Harrison, A.T.: Morphological changes within the chaparral vegetation type as related to elevational gradients. Madroño 22, 281–316 (1974a)
Mooney, H.A., Troughton, I., Berry, I.: Arid climates and photosynthetic systems. Carnegie Inst. Wash. Year Book 73, 792–805 (1974b)
Mooney, H.A., Harrison, A.T., Morrow, P.A.: Environmental limitations of photosynthesis on a California evergreen shrub. Oecologia 19, 293–301 (1975)
Mustafa, J.: The effect of growth form and species specific variability on photosynthesis along an elevational gradient in the chaparral. M.Sc. thesis. Montreal: McGill University 1978
Oechel, W.C., Strain, B.R., Odening, W.R.: Tissue water potential, photosynthesis, 14C-labeled photosynthate utilization, and growth in the desert shrub Larrea divaricata cav. Ecol. Monogr. 42, 127–141 (1972)
Ornduff, R.: Introduction to California plant life. Berkeley, Calif.: University of California Press (1974)
Parsons, D.J., Moldenke, A.R.: Convergence in vegetation structure along analogous climatic gradients in California and Chile. Ecology 56, 950–957 (1975)
Parsons, D.J.: Vegetation structure in the Mediterranean scrub communities of California and Chile. J. Ecol. 64, 435–447 (1976)
Riley, D., Young, A.: World vegetation. London: Cambridge Univ. Press 1966
Smith, E.M., Hadley E.B.: Photosynthetic and respiratory acclimation to temperature in Ledum groenlandicum populations. Arct. Alp. Res. 6, 13–27 (1974)
Solbrig, O., Orians, G.: Adaptive characteristics of desert plants. Am. Sci. 65, 412–421 (1977)
Strain, B.R.: Seasonal adaptations in photosynthesis and respiration in four desert shrubs growing in situ. Ecology 50, 511–513 (1969)
Tieszen, L.L., Johnson, D.A., Caldwell, M.M.: A portable system for the measurement of photosynthesis using 14-Carbon dioxide. Photosynthetica 8, 151–164 (1974)
Wang, C.H., Willis, D.L., Loveland, W.D.: Radiotracer methodology in the biological, environmental and physical sciences. Englewood Cliffs, N.J.: Prentice-Hall 1975
Woeller, F.H.: Liquid scintillation counting of 14CO2 with phenethylanine. Anal. Biochem. 2, 508–511 (1961)
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Oechel, W.C., Mustafa, J. Energy utilization and carbon metabolism in mediterranean scrub vegetation of Chile and California. Oecologia 41, 305–315 (1979). https://doi.org/10.1007/BF00377435
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DOI: https://doi.org/10.1007/BF00377435