Dr. David Reznick
Department of Evolution, Ecology, & Organismal Biology

PhD Biology 1980 University of Pennsylvania

Phone : (951) 827-5820
Fax : (951) 827-4286
e-mail : david.reznick@ucr.edu
Research Specialization - evolutionary biology.

My general interest is in studying the process of evolution by natural selection from an experimental perspective and testing evolutionary theory in natural populations. I primarily work on guppies from the Caribbean Island of Trinidad. Guppies are found in high and low predation environments that differ in the species of predators that guppies co-occur with. This contrast is found repeatedly in different drainages and the different predation regimes are often right next to one another, separated by a waterfall. Guppies from high predation environments experience much higher mortality rates. High mortality is associated with earlier maturity, a higher rate of investment of resources in reproduction, and the production of more and smaller offspring. All of these differences have a genetic basis. Mortality rates can be manipulated by either introducing guppies from high predation localities into sites from which they and their predators had previously been excluded by waterfalls, thus lowering mortality rates, or by introducing predators into low predation sites over barrier waterfalls, thus increasing mortality rates. Such experiments have shown that live histories evolve as predicted by theory and in a fashion that is consistent with the earlier comparative studies They have also shown that evolution by natural selection can be remarkably fast, on the order of four to seven orders of magnitude faster than inferred from the fossil record. I am currently studying the evolution of aging in this same system.


See publications on PubMed

Bassar, R. D., T. Simon, W. Roberts, J. Travis, D. N. Reznick. The evolution of coexistence: Reciprocal adaptation promotes the assembly of a simple community. Evolution 71: 373- 385. (2017).

Reznick, D. N., A. I. Furness, R. W. Meredith and M. Springer. The origin and biogeographic diversification of fishes in the family Poecliidae. Plos One 12: Article number: e0172546. (2017).

Reznick, D. N. Hard and soft selection revisited: how evolution by natural selection works in the real world. J. of Heredity 107: S3-S14. (2016).

Ghalambor, C. K., K. L. Hoke, E. W. Ruell, E. K. Fischer, D. N. Reznick and K. A. Hughes. Non-adaptive plasticity potentiates rapid adaptive evolution of gene expression in nature. Nature 525: 372-375. (2015).

Travis, J., D. N. Reznick, R. D. Bassar, A. Lopez-Sepulcre, R. Ferriere and T. Coulson. Do eco-evo feedbacks help us understand nature? Answers from studies of the Trinidadian guppy. Advances in Ecological Research 50: 1-40. (2014).

Pollux, B. J. A., R. W. Meredith, T. Garland, M. S. Springer, and D. N. Reznick. The evolution of the placenta drives a shift in sexual selection in livebearing fish. Nature 513: 233-236. (2014).

Reznick, D. N. A critical look at reciprocity in ecology and evolution: introduction to the symposium. American Naturalist 181: S1-S8. (2013).

Bassar, R. D., A. Lopez-Sepulcre, D. N. Reznick and J. Travis. Experimental evidence for density-dependent regulation and selection on Trinidadian guppy life histories. American Naturalist 181: 25-38. (2013).

Reznick, D. N., R. D. Bassar, J. Travis and H. F. Rodd. Life history evolution in guppies VIII: The demographics of density regulation in guppies (Poecilia reticulata). Evolution 66: 2903-2915. (2012).

Walsh, M. R. and D. N. Reznick. Experimentally induced life-history evolution in a killifish in response to the introduction of guppies. Evolution 65: 1021-1036. (2011).

Bassar, R. D., M. Marshall, A. Lopez-Sepulcre, R. Zandona, S. K. Auer, J. Travis, C. M. Pringle, A. S. Flecker, S. A. Thomas, D. F. Fraser and D. N. Reznick. Local adaptation in Trinidadian guppies alters ecosystem processes. Proceedings of the National Academy of Sciences 107: 3616-3621. (2010).

Pollux, B. J. A., M. Pires, A. I. Banet and D. N. Reznick. Evolution of placentas in the fish family Poeciliidae: An empirical study of macroevolution. Annual Reviews of Ecology and Systematics 40: 271-289. (2009).

Reznick, D. N. and R. E. Ricklefs. Darwin's bridge between microevolution and macroevolution. Nature 457: 837-842. (2009).

Walsh, M. and D. N. Reznick. Interactions between the direct and indirect effects of predators determine life history evolution in a killfish. Proceedings of the National Academy of Sciences 105: 594-599. (2008).

Ghalambor, C. K., J. K. McKay, S. P. Carroll and D. N. Reznick. Adaptive versus non-adaptive phenotypic plasticity and the potential for adaptation to new environments. Functional Ecology 21: 394-407. (2007).

Olendorf, R., F. H. Rodd, D. Punzalan, A. E. Houde, C. Hurt, D. N. Reznick and K. A. Hughes. Frequency-dependent survival in natural guppy populations. Nature 441: 633-636. (2006).

Reznick, D. N., M. J. Bryant, and D. Holmes. The evolution of senescence and post-reproductive lifespan in guppies (Poecilia reticulata). PLOS-Biology 4: 136-143. (2006).

Reznick, D. N. and C. Ghalambor. Can commercial fishing cause evolution? Answers from guppies. Can. J. of Fisheries and Aquatic Sciences 62: 791-801. (2005).

Home | People | Research | Events | Courses | Outreach | Links | Give A Gift | Headlines | Contact Us | WebMaster