Analysis of an evolutionary species–area relationship

Abstract

Large islands typically have more species than comparable smaller islands. Ecological theories, the most influential being the equilibrium theory of island biogeography1, explain the species–area relationship as the outcome of the effect of area on immigration and extinction rates. However, these theories do not apply to taxa on land masses, including continents and large islands, that generate most of their species in situ. In this case, species–area relationships should be driven by higher speciation rates in larger areas2,3,4,5,6, a theory that has never been quantitatively tested. Here we show that Anolis lizards on Caribbean islands meet several expectations of the evolutionary theory. Within-island speciation exceeds immigration as a source of new species on all islands larger than 3,000 km2, whereas speciation is rare on smaller islands. Above this threshold island size, the rate of species proliferation increases with island area, a process that results principally from the positive effects of area on speciation rate. Also as expected, the slope of the species–area relationship jumps sharply above the threshold. Although Anolis lizards have been present on large Caribbean islands for over 30 million years, there are indications that the current number of species still falls below the speciation–extinction equilibrium.

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Figure 1: Recorded speciation events on islands, as a proportion of the total number of speciation and immigration events, in relation to island area. ‘Immigration’ probably includes some between-island speciation events resulting from island fragmentation (vicariance).
Figure 2: Speciation rate on large islands in relation to island area.
Figure 3: The species–area relationship fitted with a regression model having a breakpoint and two slopes.

References

  1. 1

    MacArthur, R. H. & Wilson, E. O. The Theory of Island Biogeography (Princeton Univ. Press, Princeton, 1967).

    Google Scholar 

  2. 2

    MacArthur, R. H. Patterns of communities in the tropics. Biol. J. Linn. Soc. 1, 19–30 (1969).

    Article  Google Scholar 

  3. 3

    Rosenzweig, M. L. in Ecology and Evolution of Communities (eds Cody, M. L. & Diamond, J. M.) 121–140 (Harvard Univ. Press, Cambridge, 1975).

    Google Scholar 

  4. 4

    Diamond, J. M. Continental and insular speciation in Pacific land birds. Syst. Zool. 26, 263–268 (1977).

    Article  Google Scholar 

  5. 5

    Case, T. J. & Cody, M. in Island Biogeography in the Sea of Cortéz (eds Case T. J. & Cody, M. L.) 307–340 (Univ. California Press, Berkeley, 1983).

    Google Scholar 

  6. 6

    Lomolino, M. V. Ecology's most general, yet protean pattern: the species-area relationship. J. Biogeography 7, 17–26 (2000).

    Article  Google Scholar 

  7. 7

    Schochat, D. & Dessauer, H. C. Comparative immunological study of albumins of Anolis lizards of the Caribbean islands. Comp. Biochem. Physiol. A 68, 67–73 (1981).

    Article  Google Scholar 

  8. 8

    Williams, E. E. in Lizard Ecology: Studies of a Model Organism (eds Huey, R. B., Pianka, E. R. & Schoener, T. W.) 326–370 (Harvard Univ. Press, Cambridge, 1983).

    Google Scholar 

  9. 9

    Jackman, T. R., Larson, A., de Queiroz, K. & Losos, J. B. Phylogenetic relationships and tempo of early diversification in Anolis lizards. Syst. Biol. 48, 254–285 (1999).

    Article  Google Scholar 

  10. 10

    Rand, A. S. Competitive exclusion among anoles (Sauria: Iguanidae) on small islands in the West Indies. Breviora 319, 1–16 (1969).

    Google Scholar 

  11. 11

    Losos, J. B. Ecological and evolutionary determinants of the species-area relation in Caribbean anoline lizards. Philos. Trans. R. Soc. Lond. B 351, 847–854 (1996).

    ADS  Article  Google Scholar 

  12. 12

    Nee, S., May, R. M. & Harvey, P. The reconstructed evolutionary process. Philos. Trans. R. Soc. B 344, 305–311 (1994).

    ADS  CAS  Article  Google Scholar 

  13. 13

    Brown, J. H. & Lomolino, M. V. Biogeography 2nd edn (Sinauer Ass., Sunderland, 1998).

    Google Scholar 

  14. 14

    Hedges, S. B. Vicariance and dispersal in Caribbean biogeography. 52, 466–473 (1996).

  15. 15

    Crother, B. I. & Guyer, C. Caribbean historical biogeography: was the dispersal-vicariance debate eliminated by an extraterrestrial bolide? Herpetologica 52, 440–465 (1996).

    Google Scholar 

  16. 16

    Toft, C. A. & Schoener, T. W. Abundance and diversity of orb spiders on 106 Bahamian islands: biogeography at an intermediate trophic level. Oikos 41, 411–426 (1983).

    Article  Google Scholar 

  17. 17

    Pimm, S. L. The Balance of Nature (Univ. Chicago Press, Chicago, 1991).

    Google Scholar 

  18. 18

    Rosenzweig, M. L. Species Diversity in Space and Time (Cambridge Univ. Press, Cambridge, UK, 1995).

    Google Scholar 

  19. 19

    Mayr, E. Animal Species and Evolution (Harvard Univ. Press, Cambridge, MA, 1963).

    Google Scholar 

  20. 20

    Futuyma, D. J. Evolutionary Biology 2nd edn. (Sinauer Ass., Sunderland, 1998).

    Google Scholar 

  21. 21

    Donovan, S. K. & Jackson, T. A. Caribbean Geology: An Introduction (Univ. West Indies Publishers' Ass., Kingston, 1994).

    Google Scholar 

  22. 22

    Iturralde-Vinent, M. A. & MacPhee, R. D. E. Paleogeography of the Caribbean region: implications for Cenozoic biogeography. Bull. Am. Mus. Nat. Hist. 238, 1–95 (1999).

    Google Scholar 

  23. 23

    Ricklefs, R. E. & Lovette, I. J. The roles of island area per se and habitat diversity in the species-area relationships of four Lesser Antillean faunal groups. J. Anim. Ecol. 68, 1142–1160 (1999).

    Article  Google Scholar 

  24. 24

    Schluter, D. Ecological causes of adaptive radiation. Am. Nat. 148, S40–S64 (1996).

    Article  Google Scholar 

  25. 25

    Wagner, W. W. & Funk, V. A. Hawaiian Biogeography: Evolution on a Hot Spot Archipelago (Smith. Inst. Press, Washington DC, 1995).

    Google Scholar 

  26. 26

    Bauer, A. M. Reptiles and the biogeographic interpretation of New Caledonia. Tuatara 30, 39–50 (1988).

    Google Scholar 

  27. 27

    Felsenstein, J. PHYLIP (Phylogeny Inference Package), Version 3.5c. (Distributed by the author from Dept. Genetics, Univ. Washington, Seattle, 1993).

  28. 28

    Creer, D. A., de Queiroz, K., Jackman, T. R., Losos, J. B. & Larson, A. Systematics of the Anolis roquet series of the Southern Lesser Antilles. J. Herp. (in the press).

  29. 29

    Schneider, C. J., Losos, J. B. & de Queiroz, K. Evolutionary relationships of bimaculatus group anoles from the northern Lesser Antilles. J. Herp. (in the press).

  30. 30

    Jackman, T. R., Losos, J. B., Larson, A. & de Queiroz, K. in Molecular Evolution and Adaptive Radiation (eds Givnish, T. J. & Sytsma, K. J.) 535–557 (Cambridge Univ. Press, Cambridge, UK, 1997).

    Google Scholar 

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Acknowledgements

This work was supported by the National Science Foundation, The Natural Sciences and Engineering Research Council of Canada, and the David and Lucille Packard Foundation. We thank T. Jackman and S. Otto for helpful assistance and discussion.

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Correspondence to Jonathan B. Losos.

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Losos, J., Schluter, D. Analysis of an evolutionary species–area relationship. Nature 408, 847–850 (2000). https://doi.org/10.1038/35048558

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