Ecological Character Displacement

Peter R Grant, Princeton University, Princeton, New Jersey, USA

Published online: December 2013

DOI: 10.1002/9780470015902.a0001811.pub2

Abstract

Some morphological differences between closely related species living in the same environment have been enhanced by natural selection resulting from competition between the species or the negative effects of interbreeding. These evolutionary changes are known as ecological and reproductive character displacement, respectively. Ecological character displacement, the subject of this article, helps us to understand how complex communities are built up from simpler ones through ecological adjustments of the constituent species. It also may be involved in the late stages in speciation when formerly allopatric populations come together in sympatry. Examples are given from studies of birds in nature and sticklebacks in experiments. There are few cases of ecological character displacement in nature where the evidence is sufficiently strong to demonstrate evolution by natural selection and to rule out alternative explanations of the causes. These have been supplemented by experiments: there is scope and need for more.

Key Concepts:

  • Character displacement is a process of evolutionary divergence of coexisting species.

  • Competition for resources, such as food, is reduced as a result of divergence.

  • Natural selection causes the evolutionary change.

  • Closely related species differ in morphology more in sympatry than in allopatry.

  • Experiments attempt to recreate conditions that are conducive to character displacement in nature.

  • Solitary species are released from competition and broaden their ecological niches.

  • Character displacement helps to explain how complex communities of potential competitors develop from simple ones.

  • Character displacement is one of several types of evolutionary adjustments made by coexisting species.

  • Its signature should be seen most clearly in young adaptive radiations.

  • The main question about character displacement is not whether it occurs but how important it is.

Keywords: divergence; competition; food; natural selection; evolution; adaptive radiation

Figure 1.

The classical case of character displacement is a pattern of enhanced morphological difference in sympatry: two species of Eurasian rock nuthatches differ more in beak size (and eye stripe size) where they occur together in sympatry (a and d) than where they occur alone in allopatry (b and c). The species are Sitta neumayer (c, Greece; d, Iran) and Sitta tephtonota (a, Iran; b, Russia). Reproduced from Grant . © Springer.
Figure 2.

Character displacement in the beak size of the Medium Ground Finch population (Geospiza fortis) on Daphne Major Island, Galápagos. Relatively high mortality of birds with large beaks during a drought in 2004 gave rise to a sharp decrease in average beak size. Differential mortality was caused by competition with Large Ground Finches (Geospiza magnirostris) (Figure ). The net result was an enhanced difference between the species. Mean beak size (solid circles) and 95% confidence intervals (vertical bars) are shown for each year. The broken horizontal lines mark the limits of confidence for the mean of the first large sample in 1973. Adapted from Grant and Grant . © Princeton University Press.
Figure 3.

Character displacement of Darwin's finches. Large members (a) of the Medium Ground Finch Population (Geospiza fortis) died from starvation at a higher rate than the small members (c) in the drought of 2004. This happened as a result of competition between large Geospiza fortis and Large Ground Finches (Geospiza magnirostris) (b) that are superior exploiters of the large and hard woody fruits of Tribulus cistoides (d) at times of food scarcity. Reproduced from Grant and Grant . © AAAS.
Figure 4.

Sticklebacks in the Gasterosteus aculeatus complex; a limnetic species above and a benthic species below. Reproduced with permission from Nicole Bedford. © Nicole Bedford.
Figure 5.

The classical experiment of character displacement. The growth of sticklebacks is reduced in the presence (broken line) of a competitor species compared with their growth in the absence of competitors (solid line). The effect of competitors is strongest on the fish that are most similar to the competitors in morphology (i.e. large index values in this example).
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References

Abrams P (1990) Mixed responses to resource densities and their implications for character displacement. Evolutionary Ecology 4: 93–102.

Adams DC (2004) Character displacement via aggressive interference in Appalachian salamanders. Ecology 85: 2664–2670.

Barluenga M , Stölting KN , Salzburger W , Muschick M and Meyer A (2006) Sympatric speciation in Nicaragua crater lake cichlid fish. Nature 439: 719–723.

Brown WL Jr and Wilson EO (1956) Character displacement. Systematic Zoology 5: 49–64.

Darwin C (1859) On the Origin of Species by Means of Natural Selection, or Preservation of Favored Races in the Struggle for Life. London: John Murray.

Dayan T and Simberloff D (2005) Ecological and community‐wide character displacement: the next generation. Ecology Letters 8: 875–894.

Doebeli M (1996) An explicit genetic model for ecological character displacement. Ecology 77: 510–520.

Givnish TJ and Sytsma K (1998) Molecular Evolution and Adaptive Radiation. Cambridge: Cambridge University Press.

Grant PR (1972) Convergent and divergent character displacement. Biological Journal of the Linnean Society 4: 39–68.

Grant PR (1975) The classical case of character displacement. Evolutionary Biology 8: 237–337.

Grant PR and Grant BR (2006) Evolution of character displacement in Darwin's finches. Science 313: 224–226.

Grant PR and Grant BR (2008) How and Why Species Multiply. Princeton: Princeton University Press.

Grether GF , Losin N , Anderson CN and Okamoto K (2009) The role of interspecific interference competition in character displacement and the evolution of competitor recognition. Biological Reviews 84: 617–635.

Hatfield T and Schluter D (1996) A test for sexual selection on hybrids of two sympatric sticklebacks. Evolution 50: 2429–2434.

Hoskin CJ , Higgie M , McDonald KR and Moritz C (2005) Reinforcement drives rapid allopatric speciation. Nature 437: 1353–1356.

Kawano K (2003) Character displacement in stag beetles (Coleoptera: Lucanidae). Annals of the Entomological Society of America 96: 503–511.

Lack D (1947) Darwin's Finches. Cambridge: Cambridge University Press.

Losos JB (2009) Lizards in an Evolutionary Tree. Ecology and Adaptive Radiation of Anoles. Los Angeles: University of California Press.

Pfennig DW and Pfennig KS (2010) Character displacement and the origin of diversity. American Naturalist 176: S26–S44.

Pfennig DW and Pfennig KS (2012) Evolution's Wedge. Competition and the Origins of Diversity. Los Angeles: University of California Press.

Pfennig KS and Pfennig DW (2009) Character displacement: ecological and reproductive responses to a common evolutionary problem. Quarterly Review of Biology 84: 253–276.

Schluter D (1994) Experimental evidence that competition promotes divergence in adaptive radiation. Science 266: 798–801.

Schluter D (2000) The Ecology of Adaptive Radiation. Oxford: Oxford University Press.

Schluter D and McPhail JD (1992) Ecological character displacement and speciation. American Naturalist 140: 85–108.

Schluter D , Price TD and Grant PR (1985) Ecological character displacement in Darwin's finches. Science 227: 1056–1059.

Seehausen O (2006) African cichlid fish: a model system in adaptive radiation research. Proceedings of the Royal Society B: Biological Sciences 273: 1987–1998.

Slatkin M (1980) Ecological character displacement. Ecology 61: 163–177.

Stuart YE and Losos JB (2013) Ecological character displacement: glass half full or half empty? Trends in Ecology and Evolution 1682: 1–7.

Taper ML and Case TJ (1985) Quantitative genetic models for the coevolution of character displacement. Ecology 66: 355–371.

Thompson J (2013) Relentless Evolution. Chicago: University of Chicago Press.

Wagner WH Jr and Funk VA (1996) Hawaiian Biogeography. Evolution on a Hot Spot Archipelago. Washington, DC: Smithsonian Institution Press.

Further Reading

Goldberg EE , Lande R and Price TD (2012) Population regulation and character displacement in a seasonal environment. American Naturalist 179: 693–705.

Grant PR (1999) Ecology and Evolution of Darwin's Finches, 2nd edn. Princeton: Princeton University Press.

Grant PR and Grant BR (2014) 40 Years of Evolution. Darwin's Finches on Daphne Major Island. Princeton: Princeton University Press.

Hansen TE , Armbruster WS and Antonsen L (2000) Comparative analysis of character displacement and special adaptations as illustrated by the evolution of Dalechampsia blossoms. American Naturalist 156 (supplement): S17–S34.

Konomura J and Chiba S (2007) Ecological character displacement caused by reproductive interference. Journal of Theoretical Biology 247: 354–364.

Radtkey RR , Fallon SM and Case TJ (1997) Character displacement of some Cnemidophorus lizards revisited: a phylogenetic analysis. Proceedings of the National Academy of Sciences of the USA 94: 9740–9745.

Related Sub-Topics:

Selection and Variation | Population Ecology | Diversification of Plants and Animals | Evolutionary Ecology | Adaptive Evolution | Evolutionary Processes | Population Structure and Genetics | Evolution of Species
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Article Title: Ecological Character Displacement
 
How to Cite close
Grant, Peter R(Dec 2013) Ecological Character Displacement. In: eLS. John Wiley & Sons Ltd, Chichester. http://www.els.net [doi: 10.1002/9780470015902.a0001811.pub2]