, Volume 48, Issue 2, pp 260–264 | Cite as

The meanings of r- and K-selection

  • Gregory D. Parry


This paper catalogues several different dichotomies that have all been termed r- and K-selection. The status of the concept of r- and K-selection is discussed and a more restricted usage of the terms is recommended.


Restricted Usage 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. Abrahamson WG, Gadgil M (1973) Growth form and reproductive effort in goldenrods. (Solidago, Compositae). Am Nat 107:651–661Google Scholar
  2. Allen JD (1976) Life history patterns in zooplankton. Am Nat 110:165–180Google Scholar
  3. Armstrong RA, Gilpin ME (1977) Evolution in a time-varying environment. Science 195:591–592Google Scholar
  4. Atkinson WD (1979) A comparison of the reproductive strategies of domestic species of Drosophila. J Anim Ecol 48:53–64Google Scholar
  5. Barbosa P (1977) r and K strategies in some larval and pupal parasitoids of the gypsy moth. Oecologia (Berl) 29:311–327Google Scholar
  6. Bell KL, Hiatt HD, Niles WE (1979) Seasonal changes in biomass allocation in eight winter annuals of the Mofave Desert. J Ecol 67:781–787Google Scholar
  7. Bostock SJ, Benton RA (1979) The reproductive strategies of five perennial Compositae. J Ecol 67:91–107Google Scholar
  8. Boyce MS (1979) Seasonality and patterns of natural selection for life histories. Am Nat 114:569–583Google Scholar
  9. Branch GM (1976) Interspecific competition experienced by South African Patella species. J Anim Ecol 45:507–529Google Scholar
  10. Bryant DM (1979) Reproductive costs in the house martin (Delichon urbica). J Anim Ecol 48:655–675Google Scholar
  11. Calow P (1978) The evolution of life-cycle strategies in freshwater gastropods. Malacologia 17:351–364Google Scholar
  12. Calow P (1978) The cost of reproduction — a physiological approach. Biol Rev 54:23–40Google Scholar
  13. Calow P, Woollhead AS (1977) The relationship between ration, reproductive effort and age-specific mortality in the evolution of life-history strategies — some observations on freshwater triclads. J Anim Ecol 46:765–781Google Scholar
  14. Charlesworth B (1971) Selection in density-regulated populations. Ecology 52:469–474Google Scholar
  15. Clarke A (1979) On living in cold water: K-strategies in antarctic benthos. Mar Biol 55:111–119Google Scholar
  16. Clarke B (1972) Density-dependent selection. Am Nat 106:1–13Google Scholar
  17. Cody ML (1966) A general theory of clutch size. Evolution 20:174–184Google Scholar
  18. Cody ML, Diamond JM (1975) Introduction. In: ML Cody and JM Diamond (eds), Ecology and Evolution of Communities. Harvard University Press, Cambridge Massachusetts p 1–12Google Scholar
  19. Demetrius L (1975) Reproductive strategies and natural selection. Am Nat 109:243–249Google Scholar
  20. Derickson WK (1976) Ecological and physiological aspects of reproductive strategies in two lizards. Ecology 57:445–458Google Scholar
  21. Dobzansky T (1950) Evolution in the tropics. Am Sci 38:209–221Google Scholar
  22. Esch GW, Hazen TC, Aho JM (1977) Parasitism and r- and K-selection. In: GW Esch (ed), Regulation of parasite populations. Academic Press New York p 9–62Google Scholar
  23. Fenchel T (1974) Intrinsic rate of natural increase: The relationship with body size. Oecologia (Berl) 14:317–326Google Scholar
  24. Forsyth AB, Robertson RJ (1975) K reproductive strategy and larval behaviour of the pitcher plant sarcophagid fly, Blaesoxipha fletcheri. Can J Zool 53:174–179Google Scholar
  25. Gadgil M, Bossert WH (1970) Life historical consequences of natural selection. Am Nat 104:1–24Google Scholar
  26. Gadgil M, Solbrig OT (1972) The concept of r- and K-selection: evidence from wild flowers and some theoretical considerations. Am Nat 106:14–31Google Scholar
  27. Gaines MS, Vogt KJ, Hamrick JL, Caldwell J (1974) Reproductive strategies and growth patterns in sunflowers (Helianthus). Am Nat 108:889–894Google Scholar
  28. Gould SJ (1977) Ontogeny and phylogeny. Harvard University Press Cambridge, MassachusettsGoogle Scholar
  29. Grahame J (1977) Reproductive effort and r- and K-selection in two species of Lacuna (Gastropoda: Prosobranchia). Mar Biol 40:217–224Google Scholar
  30. Grime JP (1979) Competition and the struggle for existence. In: RM Anderson, BD Turner and LR Taylor (eds), Population dynamics, Proc. 20th Symp. B.E.S. Blackwell Scientific Publications Oxford p 123–139Google Scholar
  31. Hairston NG, Tinkle DW, Wilbur HM (1970) Natural selection and the parameters of population growth. J Wildl Manage 34:681–690Google Scholar
  32. Haukioja E, Hakala T (1978) Life history evolution in Anodonta piscinalis (Mollusca, Pelecypoda). Oecologia (Berl) 35:253–266Google Scholar
  33. Hiekman JC (1975) Environmental unpredictability and plastic energy allocation strategies in the annual Polygonum cascadense (Polygonaceae). J Ecol 63:689–701Google Scholar
  34. Hicks GRF (1979) Pattern and strategy in the reproductive cycles of benthic harpacticoid copepods. In: Cyclic phenomena in marine plants and animals, Proc. 13th Euro. Mar Biol Symp Pergamon Press Oxford p 139–147Google Scholar
  35. Hirshfield MF, Tinkle DW (1975) Natural selection and the evolution of reproductive effort. Proc Nat Acad Sci USA 72:2227–2231Google Scholar
  36. Horn HS (1978) Optimal tactics of reproduction and life-history. In: JR Krebs and NB Davies (eds), Behavioural Ecology. Blackwell Scientific Publications Oxford p 411–429Google Scholar
  37. Jennings JB, Calow P (1975) The relationship between high fecundity and the evolution of entoparasitism. Oecologia (Berl) 21:109–115Google Scholar
  38. Jones JM (1975) The r-K-selection continuum. Am Nat 110:320–323Google Scholar
  39. King CE, Anderson WW (1971) Age-specific selection. II. The interaction between r and K during population growth. Am Nat 105:137–156Google Scholar
  40. Law R (1979a) Ecological determinants in the evolution of life histories. In: RM Anderson, BD Turner and LR Taylor (eds), Population dynamics, Proc. 20th Symp. B.E.S. Blackwell Scientific Publications Oxford p 81–103Google Scholar
  41. Law R (1979b) The cost of reproduction in annual meadow grass. Am Nat 113:3–16Google Scholar
  42. Law R, Bradshaw AD, Putwain PD (1977) Life-history variation in Poa annua. Evolution 31:233–246Google Scholar
  43. Leon JA (1976) Life histories as adaptive strategies. J Theor Biol 60:301–335Google Scholar
  44. Leutenegger W (1979) Evolution of litter size in primates. Am Nat 114:525–531Google Scholar
  45. Livdahl TP (1979) Environmental uncertainty and selection of life cycle delays in opportunistic species. Am Nat 113:835–842Google Scholar
  46. Loya Y (1976) The Red Sea coral Stylophora pistillata is an r strategist. Nature 259:478–480Google Scholar
  47. Luckinbill LS (1979) Selection and the r/K continuum in experimental populations of protozoa. Am Nat 113:427–437Google Scholar
  48. MacArthur RH (1972) Geographical ecology. Harper and Row New YorkGoogle Scholar
  49. MacArthur RH, Wilson EO (1967) The theory of island biogeography. Princeton, NJ Princeton University PressGoogle Scholar
  50. McNaughton SJ (1975) r- and K-selection in Typha. Am Nat 109:251–261Google Scholar
  51. Maiorana VC (1976) Size and environmental predictability for salamanders. Evolution 30:599–613Google Scholar
  52. Menge BA (1974) Effect of wave action and competition on brooding and reproductive effort in the sea star Leptasterias hexactis. Ecology 55:84–93Google Scholar
  53. Moore RJ (1978) Is Acanthaster plancki an r-strategist? Nature 271:56–57Google Scholar
  54. Newell SJ, Tramer EJ (1978) Reproductive strategies in herbaceous plant communities during succession. Ecology 59:228–234Google Scholar
  55. Nichols JD, Conley W, Batt B, Tipton AR (1976) Temporally dynamic reproductive strategies and the concept of r- and K-selection. Am Nat 110:995–1005Google Scholar
  56. Pianka ER (1970) On r- and K-selection. Am Nat 104:592–597Google Scholar
  57. Pianka ER (1972) r and K selection or b and d selection? Am Nat 106:581–588Google Scholar
  58. Pianka ER (1976) Natural selection of optimal reproductive tactics. Am Zool 16:775–784Google Scholar
  59. Pianka ER, Parker WS (1975) Age-specific reproductive tactics. Am Nat 109:453–464Google Scholar
  60. Primack RB (1979) Reproductive effort in annual and perennial species of Plantago (Plantinaceae). Am Nat 114:51–62Google Scholar
  61. Rex MA (1979) r- and K-selection in a deep sea gastropod. Sarsia 64:29–32Google Scholar
  62. Richardson BJ (1975) r and K selection in Kangaroos. Nature 255:323–324Google Scholar
  63. Ricklefs RE (1977) On the evolution of reproductive strategies in birds: reproductive effort. Am Nat 111:453–478Google Scholar
  64. Roughgarden J (1971) Density dependent natural selection. Ecology 52:453–468Google Scholar
  65. Schaffer WM (1974) Selection for optimal life histories: the effects of age structure. Ecology 55:291–303Google Scholar
  66. Schaffer WM, Gadgil MD (1975) Selection for optimal life histories in plants. In: ML Cody and JM Diamond (eds), Ecology and evolution of communities. Harvard University Press Cambridge Massachusetts p 142–157Google Scholar
  67. Smith CC, Fretwell SD (1974) The optimal balance between size and number of offspring. Am Nat 108:499–506Google Scholar
  68. Solbrig OT, Simpson BB (1974) Components of regulation of a population of dandelions in Michigan. J Ecol 63:473–486Google Scholar
  69. Southwood TRE (1977) Habitat, the templet for ecological strategies? J Anim Ecol 46:337–365Google Scholar
  70. Southwood TRE, May RM, Hassell MP, Conway GR (1974) Ecological strategies and population parameters. Am Nat 108:791–804Google Scholar
  71. Stearns SC (1976) Life-history tactics: a review of the ideas. Q Rev Biol 51:3–47Google Scholar
  72. Stearns SC (1977) The evolution of life history traits: a critique of the theory and a review of the data. Ann Rev Ecol Syst 8:145–171Google Scholar
  73. Stubbs M (1978) Density dependence in the life-cycles of animals and its importance in K- and r-strategies. J Anim Ecol 46:677–688Google Scholar
  74. Tamarin RH (1978) Dispersal, population regulation, and K-selection in field mice. Am Nat 112:545–555Google Scholar
  75. Whittaker RH, Goodman D (1979) Classifying species according to their demographic strategy. I. Population fluctuations and environmental heterogeneity. Am Nat 113:185–200Google Scholar
  76. Wilbur HM (1977) Propagule size, number, and dispersion pattern in Ambystoma and Asclepias. Am Nat 111:43–68Google Scholar
  77. Wilbur HM, Tinkle DW, Collins JP (1974) Environmental certainty, trophic level, and resource availability in life history evolution. Am Nat 108:805–817Google Scholar
  78. Williams GC (1966a) Adaptation and natural selection. Princeton University Press PrincetonGoogle Scholar
  79. Williams GC (1966b) Natural selection, the costs of reproduction, and a refinement of Lack's principle. Am Nat 100:687–690Google Scholar
  80. Wilson EO (1975) Sociobiology: the new synthesis. Harvard University Press Cambridge MassachusettsGoogle Scholar
  81. Wilson EO, Bossert WH (1971) A primer of population biology. sinauer Stamford, ConnecticutGoogle Scholar

Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • Gregory D. Parry
    • 1
  1. 1.Department of ZoologyMonash UniversityClaytonAustralia

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