Prevention of Deme Formation by the Pinyon Needle Scale: Problems of Specializing in a Dynamic System

  • Neil S. Cobb
  • Thomas G. Whitham


Genetic differentiation within populations has evolutionary consequences for both populations and species, and is important to issues such as local adaptation, speciation, and biodiversity (Wright 1968,1969, 1978; Lewontin 1974; Endler 1977; Brown 1979; Mitter and Futuyma 1979; Bradshaw 1984; Futuyma and Peterson 1985; Waser and Price 1985). Becoming locally adapted may allow widespread generalist species to exploit a variety of resources by forming host races (Thompson 1994); additionally, specialist herbivores may track certain host genotypes by forming biotypes (Gallun et al. 1975; Gould 1983; Service 1984; Parker 1985; Feder et al. 1988; Moran and Whitham 1988). In either case, a species may be able to increase niche breadth as a result of genetic diversity that results from local adaptation (van Valen 1965). It is therefore important to understand what mechanisms promote or prevent deme formation from occurring at different spatial levels of organization.


Host Tree Natal Tree Scale Density Scale Insect Scale Population 


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  1. Alstad, D. N. and K. W. Corbin. 1990. Scale insect allozyme differentiation within and between host trees. Evol. Ecol. 4: 43–56.CrossRefGoogle Scholar
  2. Alstad, D. N. and G. F. Edmunds Jr. 1983a. Selection, outbreeding depression, and the sex ratio of scale insects. Science 220: 93–95.PubMedCrossRefGoogle Scholar
  3. Alstad, D. N. and G. F. Edmunds Jr. 1983b. Adaptation, host specificity, and gene flow in the black pineleaf scale. Pp. 413–426 in R. F. Denno and M. S. McClure (Eds.), Variable Plants and Herbivores in Natural and Managed Systems. Academic Press, New York.Google Scholar
  4. Alstad, D. N. and G. F. Edmunds Jr. 1987. Black pineleaf scale population density in relation to interdemic mating (Hemiptera: Diaspididae). Annu. Rev. Soc. Amer. 7: 532–536.Google Scholar
  5. Bagley, M. J., B. Bentley, and G. A. E. Gall. 1994. A genetic evaluation of the influence of stocking density on the early growth of rainbow trout ( Onchorynchus mykiss ). Aquaculture 121: 313–326.Google Scholar
  6. Begon, M. 1984. Density and individual fitness: Asymmetric competition. Pp. 175–194 in B. Shorrocks (Ed.), Evolutionary Ecology. Blackwell Scientific Publishing, Oxford, UK.Google Scholar
  7. Bradshaw, A. D. 1984. Ecological significance of genetic variation between populations. Pp. 213–228 in R. Dirzo and J. Sarukhan (Eds.), Perspectives in Plant Population Biology. Sinauer Associates, Sunderland, MA.Google Scholar
  8. Brown, A. H. D. 1979. Enzyme polymorphism in plant populations. Theor. Pop. Biol. 15: 1–42.Google Scholar
  9. Christensen, K. M., T. G. Whitham, and P. Keim. 1995. Herbivory and tree mortality across a pinyon pine hybrid zone. Oecologia 101: 29–36.CrossRefGoogle Scholar
  10. Cobb, N. S. 1990. The role of host heterogeneity in preventing herbivore deme formation on individual trees. M.S. thesis, Northern Arizona University, Flagstaff, AZ.Google Scholar
  11. Cobb, N. S., J. B. Mitton, and T. G. Whitham. 1994. Genetic variation associated with chronic water and nutrient stress in pinyon pine. Am. J. Bot. 81: 936–940.CrossRefGoogle Scholar
  12. Cobb, N. S. and T. G. Whitham. 1993. Herbivore deme formation on individual trees: A test case. Oecologia 94: 496–502.CrossRefGoogle Scholar
  13. Craig, T. P., P. W. Price, K. M. Clancy, G. W. Waring, and C. F. Sacchi. 1988. Forces preventing coevolution in a three trophic level system: Willow, a gall forming herbivore, and parasitoid. Pp. 57–80 in K. C. Spencer (Ed.), Chemical Mediation of Coevolution. Academic Press, New York.Google Scholar
  14. Dayton, P. K. and M. J. Tegner. 1984. Catastrophic storms, El Niflo, and patch stability in a southern California kelp community. Science 224: 283–285.PubMedCrossRefGoogle Scholar
  15. Del Vecchio, T. A., C. A. Gehring, N. S. Cobb, and T. G. Whitham. 1993. Negative effects of scale insect herbivory on the ectomychorrhizae of juvenile pinyon pine. Ecology 74: 2297–2302.CrossRefGoogle Scholar
  16. Doane, C. C. 1966. Evidence for a sex attractant in female of the red pine scale. J. Econ. Entomol. 59:1539–1540.Google Scholar
  17. Dunham, R. A., R. E. Brummett, M. O. Ella, and R. O. Smitherman. 1990. Genotype-environment interactions for growth of blue, channel and hybrid catfish in ponds and cages at varying densities. Aquaculture 85:143–151.Google Scholar
  18. Edmunds, G. F. Jr. 1973. The ecology of black pineleaf scale. Environ. Entomol. 2: 765–777.Google Scholar
  19. Edmunds, G. F. Jr. and D. N. Alstad. 1978. Coevolution in insect herbivores and conifers. Science 199:941–945.Google Scholar
  20. Edmunds, G. F. Jr. and D. N. Alstad. 1981. Responses of black pineleaf scales to plant variability. Pages 29–38 in R. E Denno and H. Dingle (Eds.), Insect Life History Patterns. Springer-Verlag, New York.CrossRefGoogle Scholar
  21. Endler, J. A. 1977. Geographic Variation, Speciation and Clines. Princeton University Press, Princeton, NJ.Google Scholar
  22. Fay, P. A. and T. G. Whitham. 1990. Within-plant distribution of a galling adelgid (Homoptera: Adelgidae): The consequences of conflicting survivorship, growth, and reproduction. Ecol. Entomol. 15: 245–254.CrossRefGoogle Scholar
  23. Feder, J. L., C. A. Chilcote, and G. L. Bush. 1988. Genetic differentiation between sympatric host races of the apple maggot fly Rhagoletis pomonella. Nature 336: 61–64.CrossRefGoogle Scholar
  24. Futuyma, D. J. and S. C. Peterson. 1985. Genetic variation in the use of resources by insects. Annu. Rev. Entomol. 30: 217–238.CrossRefGoogle Scholar
  25. Gallun, R. L., K. J. Starks, and W. D. Guthrie. 1975. Plant resistance to insects attacking cereals. Annu. Rev. Entomol. 20: 337–357.CrossRefGoogle Scholar
  26. Glynn, R W. 1988. El Nino-Southern Oscillation 1982–1983: Nearshore population, community, and ecosystem responses. Annu. Rev. Ecol. Syst /9.: 309–345.Google Scholar
  27. Glynn, R W. and M. W. Colgan. 1992. Sporadic disturbances in fluctuating coral reef environments: El Nino and coral reef development in the eastern Pacific. Am. Zool. 32: 707–718.Google Scholar
  28. Gould, F. 1983. Genetics of Plant-herbivore systems: Interactions between applied and basic studies. Pp. 599–653 in Denno, R. F. and M. S. McClure (Eds.), Variable Plants and Herbivores in Natural and Managed Systems. Academic Press, New York.Google Scholar
  29. Hanks, L. M. and R. F. Denno. 1992. The role of demic adaptation in colonization and spread of scale insect populations. Pp. 393–411 in K. C. Kim (Ed.), Evolution of Insect Pests: The Patterns of Variations. John Wiley, New York.Google Scholar
  30. Hanks, L. M. and R. F. Denno. 1994. Local adaptation in the armored scale insect Pseudaulacaspis pentagona (Homoptera: Diaspididae). Ecology 75: 2301–2310.CrossRefGoogle Scholar
  31. Karban, R. 1987. Herbivory dependent on plant age: A hypothesis based on acquired resistance. Oikos 48:336–337.Google Scholar
  32. Karban, R. 1989. Fine-scale adaptation of herbivorous thrips to individual host plants. Nature 340:60–61.Google Scholar
  33. Kearsley, M. C. and T. G. Whitham. 1989. Developmental changes in resistance to herbivory: Implications for individuals and populations. Ecology 70: 422–434.CrossRefGoogle Scholar
  34. Kimberling, D. N. and R. W. Price. 1996. Variability in grape Phylloxera preference and performance on canyon grape ( Vitis arizonica). Oecologia 07, /: 553–559.Google Scholar
  35. Krombein, K. D., R D. Hurd Jr., D. R. Smith, and B. D. Burks. 1979. Catalog of Hymenoptera in America North of Mexico, 3 vols. Smithsonian Press, Washington, DC.Google Scholar
  36. Larsson, S. 1985. Seasonal changes in the within-crown distribution of the aphid Cinara pini on Scots Pine. Oikos 45: 217–222.Google Scholar
  37. Lewontin, R. C. 1974. The Genetic Basis of Evolutionary Change. Columbia University Press, New York.Google Scholar
  38. McCambridge, W. F. and D. A. Pierce. 1964. Observations on the life history of the pinyon needle scale Matsucoccus acalyptus (Homoptera: Coccoidea: Margarodidae). Entomol. Soc. Amer. Ann. 57: 197–200.Google Scholar
  39. Menunott, J., R. K. Day, and H. C. J. Godfray. 1995. Intraspecific variation in host plant quality: The aphid Cinara cupressi on the Mexican cypress, Cupressus lusitanica. Ecol. Entomol. 20:153–158.Google Scholar
  40. Mitter, C. and D. J. Futuyma. 1979. Population genetic consequences of feeding habits in some forest Lepidoptera. Genetics 92: 1005–1021.PubMedGoogle Scholar
  41. Mopper, S., M. Beck, D. Simberloff, and P. Stiling. 1995. Local adaptation and agents of selection in a mobile insect. Evolution 49: 810–815.Google Scholar
  42. Moran, V. C. and J. H. Hoffmann. 1987. The effects of simulated and natural rainfall on cochineal insects (Homoptera: Dactylopiidae): Colony composition and survival on cactus cladodes. Ecol. Entomol. 12: 61–68.CrossRefGoogle Scholar
  43. Moran, N. A. and T. G. Whitham. 1988. Predicting population fluctuations of organisms with complex life cycles: An aphid example.Ecology 69: 1214–1218.Google Scholar
  44. Park, S. C., J. R. West, L. P. Abrahmson, G. N. Lanier, and R. M. Silverstein. 1986. Cross-attraction between two species of Matsucoccus: Extraction, bioassay, and isolations of the sex pheromone. J. Chem. Ecol. 12: 609–617.CrossRefGoogle Scholar
  45. Parker, M. A. 1985. Local population differentiation for compatibility in an annual legume and its host-specific fungal pathogen. Evolution 39: 713–723.CrossRefGoogle Scholar
  46. Pilson, D. 1992. Relative resistance of goldenrod to aphid attack: Changes through the growing season. Evolution 46: 1230–1236.Google Scholar
  47. Rice, W. R. 1983. Sexual reproduction: An adaptation reducing parent-offspring contagion. Evolution 37: 1317–1320.CrossRefGoogle Scholar
  48. Santos, M., K. Fowler, and L. Partridge. 1994. Gene-environment interaction for body size and larval density in Drosophila melanogaster: An investigation of effects on development time, thorax length and adult sex ratio. Heredity 72: 515–521.PubMedCrossRefGoogle Scholar
  49. Service, P. 1984. Genotypic interactions in an aphid-host plant relationship: Uroleucon rudbeckiae and Rudbeckia laciniata. Oecologia 61: 271–276.CrossRefGoogle Scholar
  50. Strauss, S. Y. 1997. Lack of evidence for local adaptation to individual plant clones or site by a mobile specialist herbivore.Oecologia 110: 77–85.Google Scholar
  51. Thompson, J. N. 1994. The Coevolutionary Process. University of Chicago Press, Chicago, IL.Google Scholar
  52. Unruh, T. R. 1985. Insect-plant interactions of the pinyon needle scale and single leaf pinyon in Southern California. Ph.D. dissertation, University of California, Riverside.Google Scholar
  53. Unruh, T. R. and R. F. Luck. 1987. Deme formation in scale insects: A test with the pinyon needle scale and a review of other evidence. Ecol. Entomol. 12: 439–449.CrossRefGoogle Scholar
  54. Van Valen, L. 1965. Morphological variation and the width of the ecological niche, Am Nat 99.: 377–390.CrossRefGoogle Scholar
  55. Wainhouse, D. and R. S. Howell. 1983. Intraspecific variation in beech scale populations and in susceptibility of their host Fagus sylvatica. Ecol. Entomol 8.: 351–359.CrossRefGoogle Scholar
  56. Wall, R. and M. Begon. 1986. Population density, phenotype and mortality in the grasshopper Chorthippus brunneus. Ecol. Entomol 11.: 445–456.CrossRefGoogle Scholar
  57. Waser, N. M. and M. V. Price. 1985. Reciprocal transplant experiments with Delphinium nelsonii (Ranunculaceae): Evidence for local adaptation. Am. J. Bot. 72:1726–1732.Google Scholar
  58. Weber, K. E. 1990. Increased selection response in larger populations. I. Selection for wing-tip height in Drosophila melanogaster at three population sizes. Genetics 125: 579–584.PubMedGoogle Scholar
  59. Whitham, T. G. 1981. Individual trees as heterogeneous environments: Adaptation to herbivory or epigenetic noise? Pp. 9–28 in R. F. Denno and H. Dingle (Eds.), Insect Life History Patterns. Springer-Verlag, New York.CrossRefGoogle Scholar
  60. Whitham, T. G. 1983. Host manipulation of parasites: Within-plant variation as a defense against rapidly evolving pests. Pp. 15–41 in R. F. Denno and M. S. McClure, (Eds.), Variable Plants and Herbivores in Natural and Managed Systems. Academic Press, New York.Google Scholar
  61. Whitham, T. G. and C. N. Slobodchikoff. 1981. Evolution by individuals, plant-herbivore interactions, and mosaics of genetic variability: The adaptive significance of somatic mutations in plants. Oecologia 49: 287–292.CrossRefGoogle Scholar
  62. Whitham, T. G., A. G. Williams, and A. M. Robinson. 1984. The variation principle: Individual plants as temporal and spatial mosaics of resistance to rapidly evolving pests. Pp. 15–51 in R. W. Price, C. N. Slobodchikoff, and W. S. Gaud (Eds.), A New Ecology: Novel Approaches to Interactive Systems. John Wiley, New York.Google Scholar
  63. Wright, S. 1968. Evolution and the Genetics of Populations, Vol. I. Genetic and Biometric Foundations. University of Chicago Press, Chicago, IL.Google Scholar
  64. Wright, S. 1969. Evolution and the Genetics of Populations: Vol. 2. The Theory of Gene Frequencies. University Chicago Press, Chicago, IL.Google Scholar
  65. Wright, S. 1978. Evolution and the Genetics of Populations: Vol. 4. Variability within and among Natural Populations. University Chicago Press, Chicago, IL.Google Scholar
  66. Young, B., D. R. Miller, and M. S. McClure. 1984. Attractivity of the female sex pheromone of Chinese Matsucoccus matsumurae (Kuwana) to males of M. resinosae Bean and Godwin in the United States (Margarodidae, Coccoidea, Homoptera). Contr. Shanghai Inst. Entomol. 4:1–20.Google Scholar
  67. Zagory, D. and W. J. Libby. 1985. Maturation-related resistance of Pinus radiata to western gall rust. Phytopath 75.: 1443–1447.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1998

Authors and Affiliations

  • Neil S. Cobb
    • 1
  • Thomas G. Whitham
    • 1
  1. 1.Department of Biological SciencesNorthern Arizona UniversityFlagstaffUSA

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