Oecologia

, Volume 86, Issue 3, pp 359–367 | Cite as

The significance of genetic erosion in the process of extinction

II. Morphological variation and fitness components in populations of varying size of Salvia pratensis L. and Scabiosa columbaria L.
  • N. J. Ouborg
  • R. van Treuren
  • J. M. M. van Damme
Original Papers

Summary

The amount of genetic variation within a population is, among other things, related to population size. In small populations loss of genetic variation due to high levels of genetic drift and inbreeding may result in decline of individual fitness and increase the chance of population extinction. This chain of processes is known as genetic erosion. In this study we tested the genetic erosion hypothesis by investigating the relation between morphological variation and population size in two perennial, outbreeding plant species, Salvia pratensis and Scabiosa columbaria. To relate phenotypic variation to genetic variation the experiments were performed under common environmental conditions. For both species a positive correlation was observed between the amount of phenotypic variation and population size (Salvia r=0.915; Scabiosa r=0.703). Part of this variation is likely to have a genetic base, although maternal effects were present in the seedling and juvenile life stages. Differences between populations could in both species be attributed to parameters related to fitness, i.e. growth rate in Salvia and reproductive effort in Scabiosa. Discriminant functions reflecting these parameters did not however discriminate between large and small populations.

Results are discussed in relation to the common environment approach and to electrophoretic results obtained earlier (Van Treuren et al. 1991).

Key words

Genetic erosion Fitness Maternal effects Salvia pratensis Scabiosa columbaria 

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References

  1. Allendorf FW, Knudsen KL, Blake GM (1982) Frequencies of null alleles at enzyme loci in natural populations of ponderosa and red pine. Genetics 100:497–504Google Scholar
  2. Bradshaw AD (1984) Ecological significance of genetic variation between populations. In: Dirzo R, Sarukhán J (eds) Perspectives on plant population ecology. Sinauer, Massachusetts, pp 213–228Google Scholar
  3. Bryant EH (1986) On the use of logarithms to accommodate scale. Syst Zool 35:552–559Google Scholar
  4. Charlesworth D, Charlesworth B (1987) Inbreeding depression and its evolutionary consequences. Ann Rev Ecol Syst 18:237–268Google Scholar
  5. Endler JA (1986) Natural selection in the wild. Princeton University Press, New JerseyGoogle Scholar
  6. Falconer DS (1981) Introduction to quantitative genetics. 2nd edn. Longman, LondonGoogle Scholar
  7. Frankel OH, Soulé ME (1981) Conservation and evolution. Cambridge University Press, CambridgeGoogle Scholar
  8. Franklin IR (1980) Evolutionary change in small populations. In: Soulé ME, Wilcox BA (eds). Conservation biology: an evolutionary-ecological perspective. Sinauer, Sunderland, pp 135–149Google Scholar
  9. Karron JD (1987) A comparison of levels of genetic polymorphism and self-compatibility in geographically restricted and wide-spread plant congeners. Evol Ecol 1:47–58Google Scholar
  10. Keeler KH (1978) Intra-population differentiation in annual plants II. Electrophoretic variation in Veronica peregrina. Evolution 32:638–645Google Scholar
  11. Lagercrantz U, Ryman N (1990) Genetic structure of Norway spruce (Picea abies): Concordance of morphological and allozymic variation. Evolution 44:38–53Google Scholar
  12. Lande R (1977) On comparing coefficients of variation. Syst Zool 26:214–217Google Scholar
  13. Lande R, Barrowclough GF (1987) Effective population size, genetic variation, and their use in population management. In: Soulé ME (ed.) Viable populations for conservation. Cambridge University Press, Cambridge, pp 87–124Google Scholar
  14. Leigh EG (1981) The average lifetime of a population in a varying environment. J Theor Biol 90:213–239Google Scholar
  15. Levin DA (1984) Immigration in plants: an exercise in the subjunctive. In: Dirzo R, Sarukhán J (eds) Perspectives on plant population ecology. Sinauer, Massachusetts, pp 242–260Google Scholar
  16. Levin DA, Kerster HW (1974) Gene flow in seed plants. Evol Biol 7:139–220Google Scholar
  17. Linhart YB (1974) Intra-population differentiation in annual plants I. Veronica peregrina L. raised under non-competitive conditions. Evolution 28:232–243Google Scholar
  18. Mashburn SJ, Sharitz RR, Smith MH (1978) Genetic variation among Typha populations of the Southeastern United States. Evolution 32:681–685Google Scholar
  19. Mitton JB, Grant MC (1984) Associations among protein heterozygosity, growth rate, and developmental homeostasis. Ann Rev Ecol Syst 15:479–499Google Scholar
  20. Moran GF, Hopper SD (1983) Genetic diversity and the insular population structure of the rare granite rock species Eucalyptus caesia Benth. Aust J Bot 31:161–172Google Scholar
  21. Primack RB (1980) Phenotypic variation of rare and widespread species of Plantago. Rhodora 82:87–95Google Scholar
  22. Proctor M, Yeo P (1973) The pollination of flowers. Collins, LondonGoogle Scholar
  23. Rabinowitz D (1981) Seven forms of rarity. In: Synge H (ed). The biological aspects of rare plant conservation. Wiley, London, pp. 205–217Google Scholar
  24. Richter-Dyn N, Goel NSF (1972) On the extinction of a colonizing species. Theor Pop Biol 3:406–423Google Scholar
  25. Ritland K, Jain S (1984) A comparative study of floral and electrophoretic variation with life history variation in Limnanthes alba (Limnanthaceae). Oecologia 63:243–251Google Scholar
  26. Roach DA, Wulff RD (1987) Maternal effects in plants. Ann Rev Ecol Syst 18:209–235Google Scholar
  27. Schaal BA (1985) Genetic variation in plant populations: from demography to DNA. In: Structure and functioning of plant populations. Haeck J, Woldendorp JW (eds) North-Holland Publ. Company, pp 321–342Google Scholar
  28. Schaal BA, Schmidt WG (1980) The apportionment of genetic variation within and among populations of Desmodium nudiflorum. Evolution 34:214–221Google Scholar
  29. Schonewald-Cox CS, Chambers SM, MacBryde B, Thomas L (1983) Genetics and conservation: a reference for managing wild animal and plant populations. Benjamin-Cummings, LondonGoogle Scholar
  30. Schwaegerle KE, Schaal BA (1979) Genetic variability and founder effect in the pitcher plant Sarracenia purpurea L. Evolution 33:1210–1218Google Scholar
  31. Shaffer M (1987) Minimum viable populations: coping with uncertainty. In: Soulé ME (ed) Viable populations for conservation. Cambridge University Press, Cambridge, pp 69–86Google Scholar
  32. Sowell JB, Spomer GG (1986) Ecotypic variation in root respiration rate among elevational populations of Abies lasiocarpa and Picea engelmannii. Oecologia 68:375–379Google Scholar
  33. Sokal RS, Rohlf FJ (1981) Biometry, 2nd edn. Freeman, San FranciscoGoogle Scholar
  34. Turner JRG, Johnson MS, Eanes WF (1979) Contrasted modes of evolution in the same genome: allozymes and adaptive changes in Heliconius. Proc Nat Acad Sci USA 76:1924–1928Google Scholar
  35. Van Andel J, Wesselingh RA, Van Donk HJ (1988) The performance of progeny groups from two populations of Phyteuma nigrum, with particular reference to the chance of survival or extinction. Acta Bot Neerl 37:165–169Google Scholar
  36. Van Treuren R, Bijlsma R, van Delden W, Ouborg NJ (1991) The significance of genetic erosion in the process of extinction I. Genetic differentiation in Salvia pratensis and Scabiosa columbaria in relation to population size. Heredity (in press)Google Scholar
  37. Verkaar HJ, Schenkeveld AJ, Klashorst MP van der (1983) The ecology of short-lived forbs in chalk grasslands: dispersal of seeds. New Phytol 95:335–344Google Scholar
  38. Wolff K (1988) Natural selection in Plantago species: a genetical analysis of ecologically relevant morphological variability. Ph. D. thesis, University of GroningenGoogle Scholar
  39. Wolff K, Haeck J (1990) Genetic analysis of ecologically relevant morphological variability in Plantago lanceolata L. VI. The relation between allozyme heterozygosity and some fitness components. J Evol Biol 3:243–255Google Scholar
  40. Zangerl AR, Bazzaz FA (1983) Plasticity and genotypic variation in photosynthetic behavior of an early and late succesional species of Polygonum. Oecologia 57:270–273Google Scholar

Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • N. J. Ouborg
    • 1
  • R. van Treuren
    • 2
  • J. M. M. van Damme
    • 1
  1. 1.Department of Plant EcologyInstitute for Ecological ResearchHeterenThe Netherlands
  2. 2.Department of GeneticsUniversity of GroningenHarenThe Netherlands

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