Strong sex-specific selection on traits common to both sexes typically results in sexual dimorphism. Here we find that Wellington tree weta (Hemideina crassidens) are sexually dimorphic in both head shape and size due to differential selection pressures on the sexes: males use their heads in male-male combat and feeding whereas females use theirs for feeding only. Remarkably, the sexes share a common ontogenetic trajectory with respect to head growth. Male head shape allometry is an extension of the female’s trajectory despite maturing two instars earlier, a feat achieved through ontogenetic acceleration and hypermorphosis. Strong sexual selection also favours the evolution of alternative reproductive strategies in which some males produce morphologically different weapons. Wild-caught male H. crassidens are trimorphic with regard to weapon size, a rare phenomenon in nature, and weapon shape is related to each morph’s putative mating strategy.
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Adams, D. C. (2010). Parallel evolution of character displacement driven by competitive selection in terrestrial salamanders. BMC Evolutionary Biology, 10(72), 1–10.
Adams, D. C., & Collyer, M. (2009). A general framework for the analysis of phenotypic trajectories in evolutionary studies. Evolution, 63, 1143–1154.
Adams, D. C., & Nistri, A. (2010). Ontogenetic convergence and evolution of foot morphology in European cave salamanders (Family: Plethodontidae). BMC Evolutionary Biology, 10(216), 1–10.
Adams, D. C., Rohlf, F. J., & Slice, D. E. (2004). Geometric morphometrics: Ten years of progress following the ‘revolution’. Italian Journal of Zoology, 71, 5–16.
Alberch, P., Gould, S., Oster, G., & Wake, D. (1979). Size and shape in ontogeny and phylogeny. Paleobiology, 5, 296–317.
Allen, B., & Levinton, J. (2007). Costs of bearing a sexually selected ornamental weapon in a fiddler crab. Functional Ecology, 21, 154–161.
Anderson, M. (2001). A new method for non-parametric multivariate analysis of variance. Austral Ecology, 26, 32–46.
Andersson, M. (1994). Sexual selection. Princeton, New Jersey: Princeton University Press.
Benaglia, T., Chauveau, D., Hunter, D. R., & Young, D. S. (2009). mixtools: An R package for analyzing finite mixture models. Journal of Statistical Software, 32, 1–29.
Berner, D., Adams, D. C., Grandchamp, A., & Hendry, A. (2008). Natural selection drives patterns of lake-stream divergence in stickleback foraging morphology. Journal of Evolutionary Biology, 21, 1653–1665.
Blanckenhorn, W. U. (2005). Behavioral causes and consequences of sexual size dimorphism. Ethology, 111, 977–1016.
Bookstein, F. L. (1991). Morphometric tools for landmark data: Geometry and biology. Cambridge, UK: Cambridge University Press.
Bookstein, F., Schafer, K., Prossinger, H., Seidler, H., Fieder, M., Stringer, C., et al. (1999). Comparing frontal cranial profiles in archaic and modern Homo by morphometric analysis. Anatomical Record, 257, 217–224.
Claude, J. (2008). Morphometrics with R. New York, NY: Springer.
Claverie, T., & Smith, I. (2010). Allometry and sexual dimorphism in the chela shape in the squat lobster munida rugosa. Aquatic Biology, 8, 179–187.
Correa, C., Baeza, J., Dupre, E., Hinojosa, I., & Thiel, M. (2000). Mating behavior and fertilization success of three ontogenetic stages of male rock shrimp Rhynchocinetes typus (Decapoda: Caridea). Journal of Crustacean Biology, 20, 628–640.
Emlen, D. J. (2008). The evolution of animal weapons. Annual Reviews in Ecology, Evolution and Systematics, 39, 387–413.
Emlen, S. T., & Oring, L. W. (1977). Ecology, sexual selection, and the evolution of mating systems. Science, 197, 215–223.
Fairbairn, D. J. (1990). Factors influencing sexual size dimorphism in temperate waterstriders. American Naturalist, 136, 61–86.
Fairbairn, D. J. (1997). Allometry for sexual size dimorphism: Pattern and process in the coevolution of body size in males and females. Annual Review of Ecology and Systematics, 28, 659–687.
Fairbairn, D. J., & Preziosi, R. F. (1994). Sexual selection and the evolution of allometry for sexual size dimorphism in the water strider, Aquarius remigis. American Naturalist, 144, 101–118.
Field, L. H., & Deans, N. A. (2001). Sexual selection and secondary sexual characters of wetas and king crickets. In L. H. Field (Ed.), The Biology of Wetas, King Crickets and their Allies (pp. 179–204). Wallingford: CAB International.
Field, L. H., & Sandlant, G. R. (2001). The gallery-related ecology of New Zealand tree wetas, Hemideinafemorata and Hemideinacrassidens (Orthoptera, Anostostomatidae). In L. H. Field (Ed.), The biology of Wetas, King Crickets and their allies (pp. 243–257). Wallingford: CAB International.
Gibbs, G. W. (2001). Habitats and biogeography of New Zealand’s Deinacridine and tusked weta species. In L. H. Field (Ed.), The biology of Wetas, King Crickets and their allies (pp. 35–55). Wallingford: CAB International.
Gwynne, D. T., & Jamieson, I. (1998). Sexual selection and sexual dimorphism in a harem-polygynous insect, the alpine weta (Hemideina maori, Orthoptera Stenopelmatidae). Ethology, Ecology & Evolution, 10, 393–402.
Hens, S. (2005). Ontogeny of craniofacial sexual dimorphism in the orangutan (pongo pygmaeus). I: Face and palate. American Journal of Primataology, 65, 149–166.
Herler, J., Kerschbaumer, M., Mitteroecker, P., Postl, L., & Sturmbauer, C. (2010). Sexual dimorphism and population divergence in the lake tanganyika cichlid fish genus tropheus. Frontiers in Zoology, 7, 4.
Huyghe, K., Herrel, A., Vanhooydonck, B., & Van, D. R. (2007). It’s all in the head: Morphological basis for differences in bite force among color morphs of the dalmatian wall lizard. Journal of Morphology, 268, 1088–1089.
Kaliontzopoulou, A., Carretero, M., & Liorentel, G. (2007). Multivariate and geometric morphometrics in the analysis of sexual dimorphism variation in podarcis lizards. Journal of Morphology, 268, 152–165.
Kallman, K. D. (1984). A new look at sex determination in poeciliid fishes. In B. J. Turner (Ed.), Evolutionary genetics of fishes (pp. 95–171). New York, NY: Plenum Publishing Co. Inc.
Kelly, C. D. (2005a). Allometry and sexual selection of male weaponry in Wellington tree weta, Hemideina crassidens. Behavioral Ecology, 16, 145–152.
Kelly, C. D. (2005b). Sexual selection and infection by ectoparasites in Wellington tree weta, Hemideina crassidens (Orthoptera: Anostostomatidae). Austral Ecology, 30, 648–654.
Kelly, C. D. (2006a). Fighting for harems: Assessment strategies during male-male contests in the sexually dimorphic Wellington tree weta. Animal Behaviour, 72, 727–736.
Kelly, C. D. (2006b). The relationship between resource control, association with females and male weapon size in a male dominance insect. Ethology, 112, 362–369.
Kelly, C. D. (2008a). Identifying a causal agent of sexual selection on weaponry in an insect. Behavioral Ecology, 19, 184–192.
Kelly, C. D. (2008b). The interrelationships between resource-holding potential, resource-value and reproductive success in territorial males: How much variation can we explain? Behavioral Ecology and Sociobiology, 62, 855–871.
Lande, R. (1980). Sexual dimorphism, sexual selection, and adaption in polygenic characters. Evolution, 34, 292–305.
Lappin, A., Hamilton, P., & Sullivan, B. (2006). Bite-force performance and head shape in a sexually dimorphic crevice-dwelling lizard, the common chuckwalla [Sauromalus ater (=obesus)]. Biological Journal of the Linnean Society, 88, 215–222.
McLachlan, G. J., & Basford, K. E. (1988). Mixture models: Inference and applications to clustering. New York, NY: Marcel Dekker, Inc.
Mitteroecker, P., & Bookstein, F. (2008). The evolutionary role of modularity and integration in the hominoid cranium. Evolution, 62, 943–958.
Mitteroecker, P., Gunz, P., Bernhard, M., Schaefer, K., & Bookstein, F. (2004). Comparison of cranial ontogenetic trajectories among great apes and humans. Journal of Human Evolution, 46, 679–697.
Navarro, J., Kaliontzopoulou, A., & Gonzalez-Solis, J. (2009). Sexual dimorphism in bill morphology and feeding ecology in cory’s shearwater (Calonectris diomedea). Zoology, 112, 128–138.
Oliveira, R. F., Taborsky, M., & Brockmann, H. J. (Eds.). (2008). Alternative reproductive tactics: An integrative approach. Cambridge: Cambridge University Press.
Oufiero, C., & Garland, T. (2007). Evaluating performance costs of sexually selected traits. Functional Ecology, 21, 676–689.
R Development Core Team. (2009). R: A language and environment for statistical computing. Vienna, Austria: R Foundation for Statistical Computing.
Rohlf, F., & Marcus, L. (1993). A revolution in morphometrics. Trends in Ecology & Evolution, 8, 129–132.
Rohlf, F., & Slice, D. (1990). Extensions of the procrustes method for the optimal superimposition of landmarks. Systematic Zoology, 39, 40–59.
Rowland, J., & Emlen, D. (2009). Two thresholds, three male forms result in facultative male trimorphism in beetles. Science, 323, 773–776.
Shuster, S. M. (1987). Alternative reproductive behaviors: three discrete male morphs in Paracerceis sculpta, an intertidal isopod from the northern Gulf of California. Journal of Crustacean Biology, 7, 318–327.
Sinervo, B., & Lively, C. M. (1996). The rock-paper-scissors game and the evolution of alternative male strategies. Nature, 380, 240–243.
Spencer, A. M. (1995). Sexual maturity in the male tree weta Hemideina crassidens (Orthoptera: Stenopelmatidae). Wellington, NZ: Victoria University of Wellington.
Zar, J. H. (1999). Biostatistical analysis. Upper Saddle River, NJ: Prentice Hall.
Zelditch, M. L., Swiderski, D. L., Sheets, D. H., & Fink, W. L. (2004). Geometric morphometrics for biologists. San Diego, CA: Academic Press.
We thank Wolf Blanckenhorn and two anonymous referees for valuable comments on the manuscript. This work was supported in part by faculty start-up funds awarded to CDK by Iowa State University and NSF grant DEB-0446758 to DCA.
See Fig. 6.
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Kelly, C.D., Adams, D.C. Sexual Selection, Ontogenetic Acceleration, and Hypermorphosis Generates Male Trimorphism in Wellington Tree Weta. Evol Biol 37, 200–209 (2010). https://doi.org/10.1007/s11692-010-9096-1
- Sexual selection
- Sexually dimorphism