Abstract
Evidence for reproductive character displacement (RCD) has accumulated more slowly than for ecological character displacement, perhaps because sampling scales and environmental covariates can obscure the role of RCD in speciation. We examined an early example of RCD in an anuran species group, the vocalizations of the sympatric cricket frogs Acris crepitans and A. gryllus. With a relatively fine spatial scale, we compared mixed-species choruses (syntopy), nearby locations where A. gryllus is recently extirpated (historic sympatry), and surrounding areas without secondary contact (allopatry). In each of these areas, we evaluated variation in dominant frequency, click rate, and mass of males. In addition, we determined the acoustic preferences of syntopic females. Temperature influenced dominant frequency of vocalizations in A. crepitans, but not in A. gryllus. Body size varied more and had a stronger influence on dominant frequency in A. crepitans than in A. gryllus. Consequently, the decrease in mass of A. crepitans in syntopy resulted in convergence of body size and divergence of dominant frequencies of the two species. In contrast, dominant frequency of A. crepitans did not differ between historic sympatry and allopatry. Females of both species used fine temporal structure to discriminate between conspecific and heterospecific vocalizations and showed no preferences for dominant frequency. Chorus noise limited the ability of A. gryllus females to detect and discriminate vocalizations, so convergence in mass might have resulted from RCD in dominant frequency to reduce heterospecific acoustic interference. However, influences other than RCD might have caused syntopic convergence in body size.
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References
Adams, D. C., & Collyer, M. L. (2007). Analysis of character divergence along environmental gradients and other covariates. Evolution, 61(3), 510–515.
Amezquita, A., Hodl, W., Lima, A. P., Castellanos, L., Erdtmann, L., & Carmozina, M. (2006). Masking interference and the evolution of the acoustic communication system in the Amazonian dendrobatid frog Allobates femoralis. Evolution, 60(9), 1874–1887.
Beane, J., Braswell, A., Mitchell, J., Palmer, W., & Harrison, J. (2010). Amphibians and reptiles of the Carolinas and Virginia (2nd ed.). Chapel Hill, NC: University of North Carolina Press.
Bickford, D. P., Sheridan, J. A., & Howard, S. D. (2011). Climate change responses: Forgetting frogs, ferns and flies? Trends in Ecology & Evolution, 26(11), 553–554.
Blair, W. (1958). Mating call in the speciation of anuran amphibians. The American Naturalist, 92(862), 27–51.
Blair, W. F. (1974). Character displacement in frogs. American Zoologist, 14(4), 1119–1125.
Blem, C., Steiner, J., & Miller, M. (1978). Comparison of jumping abilities of the cricket frogs Acris gryllus and Acris crepitans. Herpetologica, 34(3), 288–291.
Brown, J. M., Hedtke, S. M., Lemmon, A. R., & Lemmon, E. M. (2010). When trees grow too long: Investigating the causes of highly inaccurate Bayesian branch-length estimates. Systematic Biology, 59(2), 145–161.
Brown, W., & Wilson, E. O. (1956). Character displacement. Systematic Zoology, 5(2), 49–64.
Burmeister, S., Ophir, A., & Ryan, M. J. (2002). Information transfer during cricket frog contests. Animal Behaviour, 64(5), 715–725.
Burmeister, S., Wilczynski, W., & Ryan, M. J. (1999). Temporal call changes and prior experience affect graded signaling in the cricket frog. Animal Behaviour, 57(3), 611–618.
Butlin, R. (1987). Speciation by reinforcement. Trends in Ecology & Evolution, 2(1), 8–13.
Capranica, R., Frishkopf, L., & Nevo, E. (1973). Encoding of geographic dialects in the auditory system of the cricket frog. Science, 182(4118), 1272–1275.
Collins, J., & Taggart, T. (2009). Standard common and current scientific names for North American amphibians, turtles, reptiles & crocodilians (6th ed.). Lawrence, KS: Center for North American Herpetology.
Conant, R., & Collins, J. (1991). A field guide to the reptiles and amphibians: Eastern and Central North America (3rd ed.). Boston, MA: Houghton Mifflin Company.
Crampton, W. G. R., Lovejoy, N. R., & Waddell, J. C. (2011). Reproductive character displacement and signal ontogeny in a sympatric assemblage of electric fish. Evolution, 65(6), 1650–1666.
Dayan, T., & Simberloff, D. (2005). Ecological and community-wide character displacement: The next generation. Ecology Letters, 8(8), 875–894.
Dobzhansky, T. (1940). Speciation as a stage in evolutionary divergence. The American Naturalist, 74(753), 312–321.
Duellman, W. E., & Sweet, S. S. (1999). Distribution patterns of amphibians in the Nearctic Region of North America. In W. E. Duellman (Ed.), Patterns of distribution of amphibians: A global perspective (pp. 31–109). Baltimore, MD: John Hopkins University Press.
Faivovich, J., Haddad, C., Garcia, P., Frost, D., Campbell, J., & Wheeler, W. (2005). Systematic review of the frog family Hylidae, with special reference to Hylinae: Phylogenetic analysis and taxonomic revision. Bulletin of the American Museum of Natural History, 294, 1–240.
Fouquette, M. (1975). Speciation in chorus frogs. I. Reproductive character displacement in the Pseudacris nigrita complex. Systematic Zoology, 24(1), 16–23.
Gamble, T., Berendzen, P., Bradley Shaffer, H., Starkey, D., & Simons, A. (2008). Species limits and phylogeography of North American cricket frogs (Acris: Hylidae). Molecular Phylogenetics and Evolution, 48(1), 112–125.
Gardner, J. L., Peters, A., Kearney, M. R., Joseph, L., & Heinsohn, R. (2011). Declining body size: A third universal response to warming? Trends in Ecology & Evolution, 26(6), 285–291.
Gerhardt, H. C. (1975). Sound pressure levels and radiation patterns of the vocalizations of some North American frogs and toads. Journal of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology, 102(1), 1–12.
Gerhardt, H. C. (1994). Reproductive character displacement of female mate choice in the grey treefrog, Hyla chrysoscelis. Animal Behaviour, 47(4), 959–969.
Gerhardt, H. C., & Huber, F. (2002). Acoustic communication in insects and Anurans: Common problems and diverse solutions. Chicago, IL: University of Chicago Press.
Gerhardt, H. C., & Klump, G. M. (1988). Masking of acoustic signals by the chorus background noise in the green tree frog: A limitation on mate choice. Animal Behaviour, 36(3), 1247–1249.
Gerhardt, H. K., & Mudry, K. M. (1980). Temperature effects on frequency preferences and mating call frequencies in the Green Treefrog, Hyla cinerea (Anura: Hylidae). Journal of Comparative Physiology, 137, 1–6.
Goldberg, E., & Lande, R. (2006). Ecological and reproductive character displacement on an environmental gradient. Evolution, 60(7), 1344–1357.
Grant, P. R., & Grant, B. R. (2006). Evolution of character displacement in Darwin’s finches. Science, 313(5784), 224–226.
Gray, R., & Brown, L. (2005). Decline of Northern cricket frogs (Acris crepitans). In M. Lannoo (Ed.), Amphibian declines: The conservation status of United States Species (pp. 47–54). Berkeley, CA: University of California Press.
Gröning, J., & Hochkirch, A. (2008). Reproductive interference between animal species. The Quarterly Review of Biology, 83(3), 257–282.
Haenel, G., Strelow, B., & Micancin, J. (2012). Exploring evolutionary and ecological causes of a dynamic species boundary in cricket frogs. Ottowa, Canada: 1st Joint Congress on Evolutionary Biology.
Höbel, G., & Gerhardt, H. C. (2003). Reproductive character displacement in the acoustic communication system of green treefrogs (Hyla cinerea). Evolution, 57(4), 894–904.
IUCN, International, C., & NatureServe. (2008). An analysis of amphibians on the 2008 IUCN Red List. International Union for the Conservation of Nature. Retrieved December 1, 2013, http://www.iucnredlist.org/initiatives/amphibians/analysis.
Jensen, J. B., Camp, C. D., Gibbons, W., & Elliot, M. J. (2008). Amphibians and reptiles of Georgia. Athens, GA: University of Georgia Press.
Johanet, A., Secondi, J., Pays, O., Pagano, A., Lodé, T., & Lemaire, C. (2009). A case of reproductive character displacement in female palmate newts (Lissotriton helveticus). Comptes Rendus Biologies, 332(6), 548–557.
Keddy-Hector, A., Wilczynski, W., & Ryan, M. J. (1992). Call patterns and basilar papilla tuning in cricket frogs. II. Intrapopulation variation and allometry. Brain, Behavior and Evolution, 39, 238–246.
Kime, N., Burmeister, S., & Ryan, M. J. (2004). Female preferences for socially variable call characters in the cricket frog, Acris crepitans. Animal Behaviour, 68(6), 1391–1399.
Kirschel, A., Blumstein, D., & Smith, T. (2009). Character displacement of song and morphology in African tinkerbirds. Proceedings of the National Academy of Sciences of the United States of America, 106(20), 8256.
Lemmon, E. M. (2009). Diversification of conspecific signals in sympatry: Geographic overlap drives multidimensional reproductive character displacement in frogs. Evolution, 63(5), 1155–1170.
Littlejohn, M. (1959). Call differentiation in a complex of seven species of Crinia (Anura, Leptodactylidae). Evolution, 13(4), 452–468.
Littlejohn, M. (1965). Premating isolation in the Hyla ewingi complex (Anura: Hylidae). Evolution, 19(2), 234–243.
Littlejohn, M. J., & Fouquette, M. (1960). Call discrimination by female frogs of the Hyla versicolor complex. Copeia, 1960(1), 47–49.
Loftus-Hills, J., & Littlejohn, M. (1992). Reinforcement and reproductive character displacement in Gastrophryne carolinensis and G. olivacea (Anura, Microhylidae): A reexamination. Evolution, 46(4), 896–906.
McCallum, M. L., Brooks, C., Mason, R., & Trauth, S. (2011). Growth, reproduction, and life span in Blanchard’s Cricket Frog (Acris blanchardi) with notes on the growth of the Northern Cricket Frog (Acris crepitans). Herpetology Notes, 4, 1–11.
McCauley, S. J., & Mabry, K. E. (2011). Climate change, body size, and phenotype dependent dispersal. Trends in Ecology & Evolution, 26(11), 554–555.
McClelland, B. E., Wilczynski, W., & Ryan, M. J. (1996). Correlations between call characteristics and morphology in male cricket frogs (Acris crepitans). Journal of Experimental Biology, 199(9), 1907–1919.
McDonald, J. (2009). Handbook of biological statistics. Baltimore, MD: Sparky House Publishing.
Meiri, S., Simberloff, D., & Dayan, T. (2011). Community-wide character displacement in the presence of clines: A test of Holarctic weasel guilds. Journal of Animal Ecology, 80(4), 824–834.
Micancin, J. P., & Mette, J. T. (2009). Acoustic and morphological identification of the sympatric cricket frogs Acris crepitans and A. gryllus and the disappearance of A. gryllus near the edge of its range. Zootaxa, 2076, 1–36.
Micancin, J. P., & Mette, J. T. (2010). Acris crepitans (Northern Cricket Frog) and Acris gryllus (Southern Cricket Frog). interspecific agonism. Herpetological Review, 41(2), 192.
Micancin, J. P., Toth, A. B., Anderson, R. B., & Mette, J. T. (2012). Sympatry and syntopy of the cricket frogs Acris crepitans and A. gryllus in southeastern Virginia, USA and decline of A. gryllus at the northern edge of its range. Herpetological Conservation and Biology, 7, 276–298.
Mount, R. (1996). The reptiles and amphibians of Alabama. Tuscaloosa, AL: The University of Alabama Press.
Nevo, E. (1973). Adaptive variation in size of cricket frogs. Ecology, 54(6), 1271–1281.
Nevo, E., & Capranica, R. (1985). Evolutionary origin of ethological reproductive isolation in cricket frogs, Acris. Evolutionary Biology, 19, 147–214.
Noor, M. A. F. (1999). Reinforcement and other consequences of sympatry. Heredity, 83, 503–508.
Perrill, S. A., & Lower, L. C. (1994). Advertisement call discrimination by female cricket frogs (Acris crepitans). Journal of Herpetology, 28(3), 399–400.
Pfennig, K. S., & Pfennig, D. W. (2009). Character displacement: Ecological and reproductive responses to a common evolutionary problem. The Quarterly Review of Biology, 84(3), 253–276.
Pfennig, D. W., & Pfennig, K. S. (2010). Character displacement and the origins of diversity. The American Naturalist, 176, S26–S44.
Richards-Zawacki, C. L., & Cummings, M. E. (2011). Intraspecific reproductive character displacement in a polymorphic poison dart frog, Dendrobates pumilio. Evolution, 65(1), 259–267.
Rissler, L. J., & Smith, W. H. (2010). Mapping amphibian contact zones and phylogeographical break hotspots across the United States. Molecular Ecology, 19(24), 5404–5416.
Rivas, L. (1964). A reinterpretation of the concepts “sympatric” and “allopatric” with proposal of the additional terms “syntopic” and “allotopic”. Systematic Zoology, 13(1), 42–43.
Rundle, H. D., & Schluter, D. (2004). Natural selection and ecological speciation in sticklebacks. In U. Dieckmann, M. Doebeli, & J. Metz (Eds.), Adaptive speciation (pp. 192–209). Cambridge: Cambridge University Press.
Ryan, M. J., & Keddy-Hector, A. (1992). Directional patterns of female mate choice and the role of sensory biases. American Naturalist, 139, S4–S35.
Ryan, M. J., & Wilczynski, W. (1988). Coevolution of sender and receiver: Effect on local mate preference in cricket frogs. Science, 240, 1786–1788.
Ryan, M. J., & Wilczynski, W. (1991). Evolution of intraspecific variation in the advertisement call of a cricket frog (Acris crepitans, Hylidae). Biological Journal of the Linnean Society, 44, 249–271.
SAS Institute Inc (2009). JMP 9 Modeling and Multivariate Methods. Cary, NC.
Schluter, D. (2000). Ecological character displacement in adaptive radiation. The American Naturalist, 156(4), S4–S16.
Servedio, M. R., & Noor, M. A. F. (2003). The role of reinforcement in speciation: Theory and data. Annual Review of Ecology Evolution and Systematics, 34, 339–364.
Smith, M. J., Osborne, W., & Hunter, D. (2003). Geographic variation in the advertisement call structure of Litoria verreauxii (Anura: Hylidae). Copeia, 4, 750–758.
Smith, S. A., Stephens, P. R., & Wiens, J. J. (2005). Replicate patterns of species richness, historical biogeography, and phylogeny in Holarctic treefrogs. Evolution, 59(11), 2433–2450.
Wagner, W. (1989a). Fighting, assessment, and frequency alteration in Blanchard’s cricket frog. Behavioral Ecology and Sociobiology, 25, 429–436.
Wagner, W. (1989b). Graded aggressive signals in Blanchard’s cricket frog: Vocal responses to opponent proximity and size. Animal Behaviour, 38, 1025–1038.
Wagner, W. (1989c). Social correlates of variation in male calling behavior in Blanchard’s cricket frog, Acris crepitans blanchardi. Ethology, 82, 27–45.
Wagner, W. E. (1992). Deceptive or honest signaling of fighting ability? A test of alternative hypotheses for the function of changes in call dominant frequency by male cricket frogs. Animal Behaviour, 44, 449–462.
Wells, K. D. (2007). The ecology and behavior of amphibians. Chicago, IL: University of Chicago Press.
Wilczynski, W., Keddy-Hector, A., & Ryan, M. J. (1992). Call patterns and basilar papilla tuning in cricket frogs. I. Differences among populations and between sexes. Brain, Behavior and Evolution, 39, 229–237.
Wollerman, L. (1999). Acoustic interference limits call detection in a Neotropical frog Hyla ebraccata. Animal Behaviour, 57(3), 529–536.
Wollerman, L., & Wiley, R. H. (2002). Background noise from a natural chorus alters female discrimination of male calls in a Neotropical frog. Animal Behaviour, 63(1), 15–22.
Acknowledgments
We thank the NC Division of Parks and Recreation, the NC Wildlife Resources Commission, and the Triangle Land Conservancy for access to field sites, the staff of Merchants Millpond State Park for logistical support, and Charles Helms and Jeff Mette for assistance in the field. We thank Brad Lamphere, Alan Feduccia, Will Mackin, and two anonymous reviewers for comments on the manuscript. Funding was provided by the University of North Carolina, the Center for the Study of the American South, and the North Carolina Herpetological Society. All work was conducted under permits from the NC Department of Parks and Recreation and NC Wildlife Resources Commission and with approval from the University of North Carolina Institutional Animal Care and Use Committee (04-068 and 07-088).
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Micancin, J.P., Wiley, R.H. Allometric Convergence, Acoustic Character Displacement, and Species Recognition in the Syntopic Cricket Frogs Acris crepitans and A. gryllus . Evol Biol 41, 425–438 (2014). https://doi.org/10.1007/s11692-014-9274-7
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DOI: https://doi.org/10.1007/s11692-014-9274-7