Advertisement

Oecologia

, Volume 89, Issue 2, pp 265–276 | Cite as

The effect of local resource availability and clonal integration on ramet functional morphology in Hydrocotyle bonariensis

  • Jonathan P. Evans
Original Papers

Summary

Within a physiologically integrated clone, the structure and functioning of an individual ramet is determined by: 1) the response of that ramet to its local environment and 2) its response to resource integration within the clone. In a multifactorial experiment, Hydrocotyle bonariensis ramets were grown in limiting resource environments with and without the benefit of basipetal resource movement from another branch of the clone. Ramets were analyzed for their morphological responses to variation in local light, water and nitrogen availability and to the superimposed effect of resource integration on these conditions. The expression of ramet morphology, from induction to development, was highly plastic in response to variable local resource availability. Resource integration changed a ramet's local response in a variety of ways depending on the resource(s) being translocated and the character involved. Among leaf characteristics (leaf weight, petiole height, blade area), resource translocation into the shade resulted in an enhancement of the local response. Similarly, the translocation of nitrogen and water generally increased clonal proliferation and sexual reproduction among ramets. In contrast, the translocation of water reversed the effect of local low water conditions on ramets by inhibiting root production. Some characters such as internode distance and leaf allometry were unaffected by integration. The maintenance of connections between ramets as a Hydrocotyle clone expands allows for resource sharing among widely separated ramets and can result in an integrated morpological response to a resource environment that is patchy in time and space.

Key words

Ramet morphology Clonal integration Hydrocotyle bonariensis Coastal dunes 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Allessio ML, Tieszen LL (1975) Patterns of carbon allocation in an arctic tundra grass, Dupontia fischeri (Gramineae), at Barrow, Alaska. Am J of Bot 62: 797–807Google Scholar
  2. Alpert P (1991) Nitrogen sharing among ramets increases clonal growth in Fragaria chiloensis. Ecology 69: 69–80Google Scholar
  3. Alpert P, Mooney HA (1986) Resource sharing among ramets in the clonal herb Fragaria chiloensis. Oecologia 70: 227–233Google Scholar
  4. Bell AD (1984) Dynamic morphology: a contribution to plant population ecology. In: Dirzo E. and Sarukhan J. (eds) Perspectives in Plant Population Ecology. Sinauer, Sunderland, MA. pp 48–65Google Scholar
  5. Bell AD, Tomlinson PB (1980) Adaptive architecture in rhizomatous plants. Bot J Linn Soc 80: 125–160Google Scholar
  6. Benner BL, Watson MA (1989) Developmental ecology of mayapple: seasonal patterns of resource distribution in sexual and vegetative rhizome systems. Funct Ecol 3: 539–547Google Scholar
  7. Bishop GF, Davy AJ (1985) Density and the commitment of apical meristems to clonal growth and reproduction in Hieracium pilosella. Oecologia 66: 417–422Google Scholar
  8. Callaghan TV, Headley AD, Svensson BM, Lixian L, Lee JA, Lindley DK (1986) Modular growth and function in the vascular cryptogam Lycopodium annotinum. Proceedings of the Royal Society of London, Series B. 228: 195–206Google Scholar
  9. Cook RE (1985) Growth and development in clonal plant populations. In: Jackson JPC, Buss LW, Cook RE (eds) Population biology and evolution of clonal organisms. Yale University Press, New Haven, Connecticut, USA. pp 259–296Google Scholar
  10. Crawford R (1989) Studies in plant Survival. Blackwell Scientific Publications, Oxford, UKGoogle Scholar
  11. Davy AJ (1987) Measurement and prediction of flowering in clonal plants. In: Atherton J (ed) Manipulation of Flowering. Butterworths, London, UK. pp 51–65Google Scholar
  12. Eriksson O (1985) Reproduction and clonal growth in Potentilla anserina (Rosaceae); the relation between growth form and dry weight. Oecologia: 66: 378–380Google Scholar
  13. Evans JP (1988) Nitrogen translocation in a clonal dune perennial, Hydrocotyle bonariensis. Oecologia 77: 64–68Google Scholar
  14. Evans JP (1989) The evolutionary implications of resource integration in the clonal dune perennial Hydrocotyle bonariensis (Apiaceae). Dissertation. Duke University, Durham, North Carolina, USAGoogle Scholar
  15. Evans JP (1991) The effect of resource integration on fitness related traits in a clonal dune perennial, Hydrocotyle bonariensis. Oecologia 86: 268–275Google Scholar
  16. Gibson DJ (1988) The maintenance of plant and soil heterogeneity in dune grassland. J Ecol 76: 497–508Google Scholar
  17. Harper JL (1985) Modules, branches, and the capture of resources. In: Jackson JPC, Buss LW, Cook RE (eds) Population biology and evolution of clonal organisms. Yale University Press, New Haven, Connecticut, USA. pp 1–33Google Scholar
  18. Harper JL, Bell AD (1979) The population dynamics of growth form in organisms with modular construction. In: Anderson RM, Turner BD, Taylor LR (eds) Population Dynamics. Blackwell Scientific Publications. Oxford, UK. pp 29–52Google Scholar
  19. Hartnett DC, Bazzaz FA (1985) The genet and ramet population dynamics of Solidago canadensis in an abandoned field. J Ecol 73: 407–413Google Scholar
  20. Hillman JR (1984) Apical dominance. In: MB Wilkins (ed) Advanced Plant Physiology. Pitman Publishing Ltd., London, UK. pp 127–148Google Scholar
  21. Hoagland DR, Arnon DI (1950) The water-culture method for growing plants without soil Cal Agr Expt Sta Circ 347Google Scholar
  22. Hutchings MJ (1988) Differential foraging for resources and structural plasticity in plants. Trend Ecol Evol 3: 200–204Google Scholar
  23. Hutchings MJ, Bradbury IK (1986) Ecological perspectives on clonal perennial plants. BioScience 36: 178–182Google Scholar
  24. Hutchings MJ, Slade AJ (1988) Morphological plasticity, foraging and integration in clonal perennial herbs. In: Davy AJ, Hutchings MJ, Watkinson AR (eds) Plant Population Ecology. Blackwell Scientific Publications, Oxford, UK. pp 83–110Google Scholar
  25. Loehle C (1987) Partitioning of reproductive effort in clonal plants: a benefit-cost model. Oikos 49: 199–208Google Scholar
  26. Longstreth DJ, Hartsock TL, Nobel PS (1981) Light effects on leaf development and photosynthetic capacity of Hydrocotyle bonariensis. Photosyn Res 2: 95–104Google Scholar
  27. Lovell PH, Lovell PJ (1985) The importance of plant form as a determining factor in competition and habitat exploitation. In: White J (ed) Studies in Plant Demography, A Festschrift for John L. Harper. Academic Press, New York. pp 209–221Google Scholar
  28. Moreno-Casasola P (1986) Sand movement as a factor in the distribution of plant communities in a coastal dune system. Vegetatio 65: 67–76Google Scholar
  29. Morris DA, Newell AJ (1987) The regulation of assimilate partition and inflorescence development in the tomato. In: Atherton J (ed) Manipulation of Flowering. Butterworths, London, UK. pp 379–391Google Scholar
  30. Noble JC, Marshall C (1983) The population biology of plants with clonal growth. II. The nutrient strategy and modular physiology of Carex arenaria. J Ecol 71: 865–877Google Scholar
  31. Pitelka LF, Ashmun JW (1985) Physiology and integration of ramets in clonal plants. In: Jackson JPC, Buss LW, Cook RE (eds) Population biology and evolution of clonal organisms. Yale University Press, New Haven, Connecticut, USA. pp 399–435Google Scholar
  32. SAS (1985) SAS user's guide: statistics. Version 5 edition. SAS Institute, Cary, North Carolina, USAGoogle Scholar
  33. Slade AJ, Hutchings MJ (1987a) An analysis of the costs and benefits of physiological integration between ramets in the clonal perennial herb Glechoma hederacea. Oecologia 73: 425–431Google Scholar
  34. Slade AJ, Hutchings MJ (1987b) Clonal integration and plasticity in foraging behavior in Glechoma hederacea. J Ecol 75: 1023–1036Google Scholar
  35. Svensson BM, Callaghan TV (1988) Apical dominance and the simulation of metapopulation dynamics in Lycopodium annotinum. Oikos 51: 331–342Google Scholar
  36. Sykes MT, Wilson JB (1990) Dark tolerance in plants of dunes. Funct Ecol 4: 799–805Google Scholar
  37. Tietema T (1980) Ecophysiology of the sand sedge Carex arenaria L. II. The distribution of 14C assimilates. Acta Bot Neer 30: 165–178Google Scholar
  38. Tietema T, van der Aa F (1981) Ecophysiology of the sand sedge, Carex arenaria L. III. Xylem translocation and the occurrence of patches of vigorous growth within the continuum of a rhizomatous plant system. Acta Bot Neer 30: 183–189Google Scholar
  39. Waller DM, Steingraeber DA (1985) Branching and modular growth: Theoretical Models and Empirical Patterns. In: Jackson JPC, Buss LW, Cook RE (eds) Population biology and evolution of clonal organisms. Yale University Press, New Haven, Connecticut, USA. pp 225–257Google Scholar
  40. Watson MA (1984) Developmental constraints: effect on population growth and patterns of resource allocation in a clonal plant. Am Natur 123: 411–426Google Scholar
  41. Whigham DF (1990) The effect of experimental defoliation on the growth and reproduction of a woodland orchid, Tipularia discolor. Can J Bot 68: 1812–1816Google Scholar
  42. Willson MF (1983) Plant Reproductive Ecology. John Wiley, New YorkGoogle Scholar

Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Jonathan P. Evans
    • 1
  1. 1.Duke University Marine LaboratoryBeaufortUSA

Personalised recommendations