WedgePfennig, D. W. and K. S. Pfennig. 2012. Evolution’s Wedge: Competition and the Origins of Diversity. University of California Press, Berkeley, CA.






Book Chapter

9780521763950Pfennig, K. S. and M. J. Ryan. 2010. Evolutionary diversification of mating behaviour: using artificial neural networks to study reproductive character displacement and speciation. Pages 187-214 in Modeling Perception with Artificial Neural Networks, C. Tosh and G. Ruxton, eds. Cambridge University Press, Cambridge, UK.





Refereed Articles

Pfennig, K. S. 2016. Reinforcement as an initiator of population divergence and speciation. Current Zoology 62: 145–154.

Schmidt, E. M. and K. S. Pfennig. 2016. Hybrid female mate choice as a species isolating mechanism: environment matters. Journal of Evolutionary Biology 29: 865-869.

Garcia, N. W., K. S. Pfennig, S. S. Burmeister. 2015. Leptin manipulation reduces appetite and causes a switch in mating preference in the Plains spadefoot toad (Spea bombifrons). PLoS ONE 10(4): e0125981. doi: 10.1371/journal.pone.0125981.

Pfennig, K. S., D. W. Pfennig, C. Porter and R. A. Martin. 2015.  Sexual selection’s impacts on ecological specialisation: an experimental test. Proceedings of the Royal Society B – Biological Sciences 282: 20150217. doi: 10.1098/rspb.2015.0217.

Pfennig, K. S. and A. M. Rice. 2014. Reinforcement generates reproductive isolation between neighbouring conspecific populations of spadefoot toads. Proceedings of the Royal Society B – Biological Sciences 281: 20140949.

Dhole, S. and K. S. Pfennig. 2014. Age-dependent male mating investment in Drosophila pseudoobscuraPLoS ONE 9(2): e88700. doi:10.1371/journal.pone.0088700

Abbott, R., D. Albach, S. Ansell, J. W. Arntzen, S. J. E. Baird, N. Bierne, J. Boughman, A. Brelsford, C. A. Buerkle, R. Buggs, R. K. Butlin, U. Dieckmann, F. Eroukhmanoff, A. Grill, S. H. Cahan, J. S. Hermansen, G. Hewitt, A. G. Hudson, C. Jiggins, J. Jones, B. Keller, T. Marczewski, J. Mallet, P. Martinez-Rodriguez, M. Möst, S. Mullen, R. Nichols, A. W. Nolte, C. Parisod, K. Pfennig, A. M. Rice, M. G. Ritchie, B. Seifert, C. M. Smadja, R. Stelkens, J. M. Szymura, R. Vinöl, J. B. W. Wolf and D. Zinner. 2013. Hybridization and speciation. Journal of Evolutionary Biology 26: 229-246.

Pfennig, K. S., V. G. Rodriguez Moncalvo and S. S. Burmeister. 2013. Diet alters species recognition in juvenile toads. Biology Letters 9: 20130599; doi: 10.1098/rsbl.2013.0599

Rodriguez Moncalvo, V. G., S. S. Burmeister and K. S. Pfennig. 2013. Social signals increase monoamine levels in the tegmentum of juvenile Mexican spadefoot toads (Spea multiplicata). Journal of Comparative Physiology – A 199: 681-691.

Wünsch, L. K. and K. S. Pfennig. 2013. Failed sperm development as a reproductive isolating barrier between species. Evolution and Development 15: 458-465.

Bazazi, S., K. S. Pfennig, N. O. Handegard and I. D. Couzin. 2012. Vortex formation and foraging in polyphenic spadefoot toad tadpoles. Behavioral Ecology and Sociobiology 66: 879-889.

Chunco, A. J., T. Jobe and K. S. Pfennig. 2012. Why do species co-occur? A test of alternative hypotheses describing abiotic differences in sympatry versus allopatry using spadefoot toads. PLoS ONE 7(3): e32748. doi:10.1371/journal.pone.0032748.

Leichty, A. R., D. W. Pfennig, C. D. Jones and K. S. Pfennig. 2012. Relaxed genetic constraint is ancestral to the evolution of phenotypic plasticity. Integrative and Comparative Biology 52: 16-30.

Pfennig, D. W. and K. S. Pfennig. 2012. Development and evolution of character displacement. The Year in Evolutionary Biology-2011: Annals of the N.Y. Academy of Sciences 1256: 89–107.

Pfennig, K. S., A. Allenby, R. A. Martin,  A. Monroy and C. D. Jones. 2012. A suite of molecular markers for identifying species, detecting introgression and describing population structure in spadefoot toads (Spea spp.). Molecular Ecology Resources 12: 909-917.

Pfennig, K. S. and A. H. Hurlbert. 2012. Heterospecific interactions and the proliferation of sexually dimorphic traits. Current Zoology 58: 453-462.

Pfennig, K. S. and A. B. Stewart. 2011. Asymmetric reproductive character displacement in male aggregation behavior. Proceedings of the Royal Society B – Biological Sciences 278: 2348-2354.

Pfennig, D. W. and K. S. Pfennig. 2010. Character displacement and the origins of diversity. American Naturalist 176: S26-S44.

Pfennig, K. S. and D. W. Pfennig. 2009. Character displacement: ecological and reproductive responses to a common evolutionary problem. The Quarterly Review of Biology 84: 253-276.

Pfennig, K. S. 2008. Population differences in condition-dependent sexual selection may promote divergence in non-sexual traits. Evolutionary Ecology Research 10: 763-773.

Rice, A. M., D. E. Pearse, T. Becker, R. A. Newman, C. Lebonville, G. R. Harper and K. S. Pfennig. 2008. Development and characterization of nine polymorphic microsatellite markers for Mexican spadefoot toads (Spea multiplicata) with cross-amplification in Plains spadefoot toads (S. bombifrons). Molecular Ecology Resources 8: 1386-1389.

Pfennig, K. S. 2007. Facultative mate choice drives adaptive hybridization. Science 318: 965-967.

Pfennig, K. S., A. J. Chunco† and A. C. R. Lackey. 2007. Ecological selection and hybrid fitness: hybrids succeed on parental resources. Evolutionary Ecology Research 9: 341-354.

Pfennig, K. S. and M. J. Ryan. 2007. Character displacement and the evolution of mate choice: an artificial neural network approach. Philosophical Transactions of the Royal Society B – Biological Sciences 362: 411-419.

Pfennig, D. W., G. R. Harper, Jr., A. F. Brumo, W. R. Harcombe and K. S. Pfennig. 2007. Population differences in predation on Batesian mimics in allopatry with their model: selection against mimics is strongest when they are common. Behavioral Ecology and Sociobiology 61: 505-511.

Vásquez, T. and K. S. Pfennig. 2007. Looking on the bright side: females prefer coloration indicative of male size and condition in the sexually dichromatic spadefoot toad, Scaphiopus couchiiBehavioral Ecology and Sociobiology 62: 127-135.

Pfennig, K. S. and M. J. Ryan. 2006. Reproductive character displacement generates reproductive isolation among conspecific populations: an artificial neural network study. Proceedings of the Royal Society B – Biological Sciences 273: 1361-1368.

Pfennig, K. S. and D. W. Pfennig. 2005. Character displacement as the “best of a bad situation”: fitness trade-offs resulting from selection to minimize resource and mate competition. Evolution 59: 2200-2208.

Pfennig, K. S. 2003. A test of alternative hypotheses for the evolution of reproductive isolation between spadefoot toads: support for the reinforcement hypothesis. Evolution 57: 2842-2851.

Pfennig, K. S. and M. A. Simovich. 2002. Differential selection to avoid hybridization in two toad species. Evolution 56: 1840-1848.

Pfennig, K. S. and R. C. Tinsley. 2002. Different mate preferences by parasitized and unparasitized females potentially reduces sexual selection. Journal of Evolutionary Biology 15: 399-406.

Pfennig, K. S. 2001. Evolution of pathogen virulence: the role of variation in host phenotype. Proceedings of the Royal Society of London Series B – Biological Sciences 268: 755-760.

Pfennig, D. W., W. R. Harcombe and K. S. Pfennig. 2001. Frequency-dependent Batesian mimicry. Nature 410: 323.

Pfennig, K. S. 2000. Female spadefoot toads compromise on mate quality to ensure conspecific matings. Behavioral Ecology 11: 220-227.

Pfennig, K. S., K. Rapa and R. McNatt. 2000. Evolution of male mating behavior: male spadefoot toads preferentially associate with conspecific males. Behavioral Ecology and Sociobiology 48: 69-74.

Pfennig, K. S. 1998. The evolution of mate choice and the potential for conflict between species and mate-quality recognition. Proceedings of the Royal Society of London Series B – Biological Sciences 265: 1743-1748.

Pfennig, K. S. and J. K. Conner. 1997. Pollen limitation in an experimental population of the wild radish Raphanus raphanistrum. Canadian Journal of Botany 75: 72-73.

Suarez, A. V., K. S. Pfennig and S. K. Robinson. 1997. Nesting success of a disturbance-dependent songbird on different kinds of edges. Conservation Biology 11: 928-935.