Summary
This paper analyzes factors which determine the extent of density compensation on islands; i.e., is the summed population density of all species on an island equal to the summed mainland density? A graphical analysis allows quantitative comparisons of density compensation studies. Two hypotheses which are generally applicable predict the extent of density compensation on islands: (1) Niche theory predicts that summed population densities should be low if island species number is low. (2) The “habitat appropriateness” hypothesis predicts that summed population densities should be low if island populations occupy unfamiliar habitat. Both hypotheses successfully explain variability in the extent of density compensation on islands. Relative to the mainland, summed population densities on islands are high when islands support a large number of species and those species occupy familiar habitats. Summed population densities on islands are low when islands support few species and those species occupy novel habitats.
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References
Abbott, I., Abbott, L.K., Grant, P.R.: Comparative ecology of Galapagos ground finches (Geospiza Gould): Evaluation of the importance of floristic diversity and interspecific competition. Ecol. Mono. 47, 151–184 (1977)
Case, T.J., Gilpin, M.E.: Interference competition and niche theory. Proc. Nat. Acad. Sci. 71, 3073–3077 (1974)
Case, T.J., Gilpin, M.E., Diamond, J.M.: Overexploitation, interference competition, and excess density compensation in insular faunas. Am. Nat. 113, 843–854 (1979)
Cody, M.L.: Competition and the structure of bird communities. Princeton, N.J.: Princeton University Press 1974
Cody, M.L.: Towards a theory of continental species diversities: Bird species distributions over Mediterranean habitat gradients. In: The Ecology and Evolution of Communities (M.L. Cody and J.M. Diamond, eds.), pp. 214–257. Cambridge, Mass: Harvard University Press 1975
Cox, G.W., Ricklefs, R.E.: Species diversity and ecological release in Caribbean land bird faunas. Oikos 28, 113–122 (1977)
Crowell, K.L.: Reduced interspecific competition among the birds of Bermuda. Ecology 43, 75–88 (1962)
Diamond, J.M.: Ecological consequences of island colonization by southwest Pacific birds, II. The effect of species diversity on total population density. Proc. Nat. Acad. Sci. 67, 1715–1721 (1970)
Diamond, J.M.: Colonization of exploded volcanic islands by birds: The supertramp strategy. Science 184, 803–805 (1974)
Diamond, J.M.: Assembly of species communities. In: The Ecology and Evolution of Communities (M.L. Cody and J.M. Diamond, eds.) pp. 342–444. Cambridge, Mass. Harvard University Press 1975
Emlen, J.T.: Density animalies and regulatory mechanisms in land bird populations on the Florida peninsula. Am. Nat. 112, 265–286 (1978)
Emlen, J.T.: Land bird densities on Baja California Islands. Auk 96, 152–167 (1979)
Ferry, C., Blondel, J., Frochot, B.: Plant successional stage and avifaunal structure on an island. Proc. 16th Int. Ornith. Congr. 643–653 (1974)
Grant, P.R.: The density of land birds on Tres Marias Islands in Mexico. I. Numbers and biomass. Can. J. Zool. 44, 805–815 (1966)
Janzen, D.H.: Sweep samples of tropical foliage insects: Effects of seasons, vegetation types, elevation, time of day and insularity. Ecology 54, 687–708 (1973)
MacArthur, R.H.: Geographical Ecology. New York: Harper and Row 1972
MacArthur, R.H., Diamond, J.M., Karr, J.R.: Density compensation in island faunas. Ecology 53, 330–342 (1972)
MacArthur, R.H., MacArthur, J., MacArthur, D., MacArthur, A.: The effect of island area on population densities. Ecology 54, 657–658 (1973)
Morse, D.: The occupation of small islands by passerine birds. Condor 79, 399–412 (1977)
Nilsson, S.G.: Density compensation and competition among birds breeding on small islands in a south Swedish lake. Oikos 28, 170–176 (1977)
Terborgh, J., Faaborg, J.: Turnover and ecological release in the avifauna of Mona Island, Puerto Rico. Auk 90, 759–779 (1973)
Terborgh, J., Faaborg, J., Brockmann, H.J.: Island colonization by Lesser Antillean birds. Auk 95, 59–72 (1978)
Thompson, L.S.: Species abundance and habitat relations of an insular montane avifauna. Condor 80, 1–14 (1978)
Wright, S.J.: Competition between insectivorous lizards and birds in central Panama. Am. Zool. 19, 1145–1156 (1979)
Yeaton, R.I.: An ecological analysis of chapparal and pine forest bird communities on Santa Cruz Island and mainland Coaifornia. Ecology 55, 959–973 (1974)
Yeaton, R.I., Cody, M.L.: Competitive release in island song sparrow populations. Theor. Pop. Biol. 5, 42–58 (1974)
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Wright, S.J. Density compensation in island avifaunas. Oecologia 45, 385–389 (1980). https://doi.org/10.1007/BF00540211
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DOI: https://doi.org/10.1007/BF00540211