Publications & Software



Publications and software based on work by current (and former) members/visitors while in the Janzen Lab (click blue text names for articles):

2014 ⇒

Bodensteiner, B. L., T. S. Mitchell, J. T. Strickland, and F. J. Janzen. 2014. Hydric conditions during incubation influence phenotypes of neonatal reptiles in the field. Functional Ecology 28: accepted pending revision.

Cordero, G. A. 2014. Re-emergence of the Painted Turtle (Chrysemys picta) as a reference species for evo-devo. Evolution & Development 16:184-188.

Cordero, G. A., and F. J. Janzen. 2014. An enhanced developmental staging table for the painted turtle, Chrysemys picta (Testudines: Emydidae). Journal of Morphology 275:442-455.

Jergenson, A. M., D. A. W. Miller, L. A. Neuman-Lee, D. A. Warner, and F. J. Janzen. 2014. Swimming against the tide: resilience of a riverine turtle to extreme environmental events. Biology Letters 10: (doi:10.1098/rsbl.2013.0782).

Miller, D. A. W., F. J. Janzen, G. M. Fellers, P. M. Kleeman, and A. M. Bronikowski. 2014. Biodemography of ectothermic tetrapods provides insights into the evolution and plasticity of mortality patterns. Pp. 293-311 in M. Lane and M. Weinstein (eds.), "Advances in Biodemography: Cross-species Comparisons of Social Environments and Social Behaviors, and their Effects on Health and Longevity." National Academy of Sciences, Washington, DC.

Mitchell, T. S., J. A. Maciel, and F. J. Janzen. 2014. Maternal influence on offspring phenotypes and selection during egg incubation and offspring hibernation in an aquatic turtle. Functional Ecology 28: accepted pending revision.

Mitchell, T. S., K. R. Rand, and F. J. Janzen. 2014. Chrysemys picta bellii (Western Painted Turtle). Predation. Herpetological Review 45: accepted pending revision.

Refsnider, J. M., C. L. Milne-Zelman, D. A. Warner, and F. J. Janzen. 2014. Population sex ratios under differing local climates in a reptile with environmental sex determination. Evolutionary Ecology 28: in press.

Sethuraman, A., S. E. McGaugh, M. L. Becker, C. H. Chandler, J. L. Christiansen, S. Hayden, A. LeClere, J. Monson-Miller, E. M. Myers, R. T. Paitz, J. M. Refsnider, T. VanDeWalle, and F. J. Janzen. 2014. Population genetics of Blandings turtle (Emys blandingii) in the midwestern United States. Conservation Genetics 15:61-73.

Spencer, R.-J., and F. J. Janzen. 2014. A novel hypothesis for the adaptive maintenance of environmental sex determination in a turtle. Proceedings of the Royal Society of London B 281: (doi:10.1098/rsbl.2014.0831).

Telemeco, R. S. 2014. Immobile and mobile life-history stages have different thermal physiologies in a lizard. Physiological and Biochemical Zoology 87: in press.

Warner, D. A., E. Addis, W.-G. Du, T. Wibbels, and F. J. Janzen. 2014. Exogenous application of estradiol to eggs unexpectedly induces male development in two turtle species with temperature-dependent sex determination. General and Comparative Endocrinology 200: accepted pending revision.

2013 ⇒

Cordero, G. A. 2013. Review of "Embryos in Deep Time: The Rock Record of Biological Development." Developmental Dynamics 242:95-96.

Cordero, G. A., and F. Janzen. 2013. Does life history affect molecular evolutionary rates? Nature Education Knowledge 4(4):1.

Delaney, D. M., A. M. Reedy, T. S. Mitchell, A. M. Durso, K. P. Durso, A. J. Morrison, and D. A. Warner. 2013. Anolis sagrei. (Brown Anole) Nest-site choice. Herpetological Review 44:314.

Durso, A. M., T. S. Mitchell, A. M. Reedy, and D. A. Warner. 2013. Ophisaurus compressus. Swimming. Herpetological Review 44:146.

Mitchell, T. S., J. A. Maciel, and F. J. Janzen. 2013. Does sex-ratio selection influence nest-site choice in a reptile with temperature-dependent sex determination? Proceedings of the Royal Society of London B 280: (doi:10.1098/rspb.2013.2460).

Mitchell, T. S., D. A. Warner, and F. J. Janzen. 2013. Phenotypic and fitness consequences of maternal nest-site choice across multiple early life stages. Ecology 94:336-345.

Reedy, A. M., D. Zaragoza, and D. A. Warner. 2013. Maternally chosen nest sites positively affect multiple components of offspring fitness in a lizard. Behavioral Ecology 24:39-46.

Refsnider, J. M.. 2013. High thermal variance in naturally-incubated turtle nests produces faster offspring. Journal of Ethology 31:85-93.

Refsnider, J. M., B. L. Bodensteiner, J. L. Reneker, and F. J. Janzen. 2013. Nest depth may not compensate for sex ratio skews caused by climate change in turtles. Animal Conservation 16:481-490 [cover feature and featured article].

Refsnider, J. M., B. L. Bodensteiner, J. L. Reneker, and F. J. Janzen. 2013. Experimental field studies of species' responses to climate change: challenges and future directions. Animal Conservation 16:498-499.

Refsnider, J. M., D. A. Warner, and F. J. Janzen. 2013. Does shade cover availability limit nest-site choice in two populations of a turtle with temperature-dependent sex determination? Journal of Thermal Biology 38:152-158.

Shaffer, H. B., P. Minx, D. E. Warren, A. M. Shedlock, R. C. Thomson, N. Valenzuela, J. Abramyan, C. T. Amemiya, D. Badenhorst, K. K. Biggar, G. M. Borchert, C. W. Botka, R. M. Bowden, E. L. Braun, A. M. Bronikowski, B. G. Bruneau, L. T. Buck, B. Capel, T. A. Castoe, M. Czerwinski, K. D. Delehaunty, S. W. Edwards, C. C. Fronick, M. K. Fujita, L. Fulton, T. A. Graves, R. E. Green, W. Haerty, R. Hariharan, O. Hernandez, L. W. Hillier, A. K. Holloway, D. Janes, F. J. Janzen, C. Kandoth, L. Kong, A. P. J. de Koning, Y. Li, R. Literman, S. E. McGaugh, L. Mork, M. OLaughlin, R. T. Paitz, D. D. Pollock, C. P. Ponting, S. Radhakrishnan, B. J. Raney, J. M. Richman, J. St. John, T. Schwartz, A. Sethuraman, P. Q. Spinks, K. B. Storey, N. Thane, T. Vinar, L. M. Zimmerman, W. C. Warren, E. R. Mardis, and R. K. Wilson. 2013. The western painted turtle genome, a model for the evolution of extreme physiological adaptations in a slowly evolving lineage. Genome Biology 14:R28.

Telemeco, R. S., K. C. Abbott, and F. J. Janzen. 2013. Modeling the effects of climate change-induced shifts in reproductive phenology on temperature-dependent traits. American Naturalist 181:637-648.

Telemeco, R. S., D. A. Warner, M. K. Reida, and F. J. Janzen. 2013. Extreme developmental temperatures result in morphological abnormalities in painted turtles (Chrysemys picta): a climate change perspective. Integrative Zoology 8:197-208.

Warner, D. A., C. D. Kelly, and M. B. Lovern. 2013. Experience affects mating behavior, but does not impact parental reproductive allocation in a lizard. Behavioral Ecology and Sociobiology 67:973-983.

Warner, D. A., and T. S. Mitchell. 2013. Does maternal oviposition site influence offspring dispersal to suitable habitat? Oecologia 172:679-688.

2012 ⇒

Chandler, C. H., G. E. Chadderdon, P. C. Phillips, I. Dworkin, and F. J. Janzen. 2012. Experimental evolution of the Caenorhabditis elegans sex determination pathway. Evolution 66:82-93.

Du, W.-G., D. A. Warner, T. Langkilde, T. R. Robbins, and R. Shine. 2012. The roles of pre-hatching and post-hatching growth rates in generating a latitudinal cline in adult body size in the eastern fence lizard (Sceloporus undulatus). Biological Journal of the Linnean Society 106:202-209.

Refsnider, J. M., and F. J. Janzen. 2012. Behavioural plasticity may compensate for climate change in a long-lived reptile with temperature-dependent sex determination. Biological Conservation 152:90-95.

Refsnider, J. M., J. T. Strickland, and F. J. Janzen. 2012. Home range and site fidelity of imperiled ornate box turtles (Terrapene ornata) in northwestern Illinois. Chelonian Conservation and Biology 11:78-83.

Steen, D. A., J. P. Gibbs, K. A. Buhlmann, J. L. Carr, B. W. Compton, J. D. Congdon, J. S. Doody, J. C. Godwin, K. L. Holcomb, D. R. Jackson, F. J. Janzen, G. Johnson, M. T. Jones, J. T. Lamer, T. A. Langen, M. V. Plummer, J. W. Rowe, R. A. Saumure, J. K. Tucker, and D. S. Wilson. 2012. Terrestrial habitat requirements of nesting freshwater turtles. Biological Conservation 150:121-128.

Warner, D. A., M. A. Moody, R. S. Telemeco, and J. J. Kolbe. 2012. Egg environments have large effects on embryonic development, but have minimal consequences for hatchling phenotypes in an invasive lizard. Biological Journal of the Linnean Society 105:25-41.

Wheelwright, N. T., J. P. Sinclair, C. Hochwender, and F. J. Janzen. 2012. Leaf size in three generations of a dioecious tropical tree, Ocotea tenera (Lauraceae): sexual dimorphism and changes with age. American Journal of Botany 99:1-6.

2011 ⇒

Bowden, R. M., R. T. Paitz, and F. J. Janzen. 2011. The ontogeny of postmaturation resource allocation in turtles. Physiological and Biochemical Zoology 84:204-211.

Du, W.-G., H. Ye, B. Zhao, D. A. Warner, and R. Shine. 2011. Thermal acclimation of heart rates in reptilian embryos. PLoS One 5:e15308.

Durso, A. M., D. A. Warner, T. S. Mitchell, and A. M. Reedy. 2011. Heterodon nasicus. Diet. Herpetological Review 42:439-440.

Janzen, F. J. 2011. Review of "Turtles: The Animal Answer Guide." Quarterly Review of Biology 86:361-362.

McGaugh, S. E., Bowden, R. M., C. H. Kuo, and F. J. Janzen. 2011. Field-measured heritability of the threshold for sex determination in a turtle with temperature-dependent sex determination. Evolutionary Ecology Research 13:75-90.

McGaugh, S. E., and F. J. Janzen. 2011. Effective heritability of targets of sex-ratio selection under environmental sex determination. Journal of Evolutionary Biology 24:784-794.

Neuman-Lee, L. A., and F. J. Janzen. 2011. Atrazine exposure impacts behavior and survivorship of neonatal turtles. Herpetologica 67:23-31.

Neuman-Lee, L. A., McGaugh, S. E., M. Pfrender, and F. J. Janzen. 2011. Using mitochondrial DNA to determine the identity and origin of a gartersnake found in Alaska. Journal of Herpetology 45:63-65.

Refsnider, J. M., T. S. Mitchell, H. M. Streby, J. T. Strickland, D. A. Warner, and F. J. Janzen. 2011. A generalized method to determine detectability of rare and cryptic species using the ornate box turtle as a model. Wildlife Society Bulletin 35:93-100.

Schwanz, L. E., D. A. Warner, S. McGaugh, R. Di-Terlizzi, and A. Bronikowski. 2011. State-dependent physiological maintenance in a long-lived ectotherm, the painted turtle (Chrysemys picta). Journal of Experimental Biology 214:88-97. [featured article]

Spencer, R.-J., and F. J. Janzen. 2011. Hatching behavior in turtles. Integrative and Comparative Biology 51:100-110.

Warner, D. A. 2011. Sex determination in reptiles. Pp. 1-38 in D. O. Norris and K. Lopez (eds.), "Hormones and Reproduction of Vertebrates, Volume 3: Reptiles." Academic Press, New York, NY.

Warner, D. A., and M. N. Chapman. 2011. Does solitary incubation enhance egg water uptake and offspring quality in a lizard that produces single-egg clutches? Journal of Experimental Zoology 315A:149-155.

Warner, D. A., M. A. Moody, and R. S. Telemeco. 2011. Is water uptake by reptilian eggs regulated by physiological processes of embryos or a passive hydraulic response to developmental environments? Comparative Biochemistry and Physiology A 160:421-425.

2010 ⇒

Chandler, C. H. 2010. Cryptic intraspecific variation in sex determination in Caenorhabditis elegans revealed by mutations. Heredity 105:473-482. [featured article]

Colbert, P. L., R.-J. Spencer, and F. J. Janzen. 2010. Mechanism and cost of synchronous hatching. Functional Ecology 24:112-121.

Du, W.-G., D. A. Warner, T. Langkilde, T. Robbins, and R. Shine. 2010. The physiological basis of geographic variation in rates of embryonic development within a widespread lizard species. American Naturalist 176:522-528.

McGaugh, S. E., L. E. Schwanz, R. M. Bowden, J. E. Gonzalez, and F. J. Janzen. 2010. Inheritance of nesting behaviour across natural environmental variation in a turtle with temperature-dependent sex determination. Proceedings of the Royal Society of London B 277:1219-1226.

Mitchell, N. J., and F. J. Janzen. 2010. Temperature-dependent sex determination and contemporary climate change. Sexual Development 4:129-140.

Refsnider, J. M., and F. J. Janzen. 2010. Putting eggs in one basket: ecological and evolutionary hypotheses for variation in oviposition-site choice. Annual Review of Ecology, Evolution, and Systematics 41:39-57.

Rice, J. W., D. A. Warner, C. D. Kelly, M. P. Clough, and J. T. Colbert. 2010. The theory of evolution is not an explanation for the origin of life. Evolution: Education and Outreach 3:141-142.

Schwanz, L. E., F. J. Janzen, and S. R. Proulx. 2010. Sex allocation based on relative and absolution condition. Evolution 64:1331-1345.

Schwanz, L. E., R.-J. Spencer, R. M. Bowden, and F. J. Janzen. 2010. Climate and predation dominate juvenile and adult recruitment in a turtle with temperature-dependent sex determination. Ecology 91:3016-3026.

Spencer, R.-J., and F. J. Janzen. 2010. Demographic consequences of adaptive growth and the ramifications for conservation of long-lived organisms. Biological Conservation 143:1951-1959.

Strickland, J. T., P. L. Colbert, and F. J. Janzen. 2010. Experimental analysis of effects of markers and habitat structure on predation of turtle nests. Journal of Herpetology 44:467-470.

Strickland, J. T., and F. J. Janzen. 2010. Impacts of anthropogenic structures on predation of painted turtle (Chrysemys picta) nests. Chelonian Conservation and Biology 9:131-135.

Warner, D. A. 2010. Book review: Sex Allocation, by Stuart West. Integrative and Comparative Biology 50:476-477.

Warner, D. A., and F. J. Janzen. 2010. Diversity of sex-determining mechanisms. Pp. 81-83 in D. F. Westneat and C. W. Fox (eds.), "Evolutionary Behavioral Ecology." Oxford University Press, New York, NY. [cover photo]

Warner, D. A., C. Jorgenson, and F. J. Janzen. 2010. Maternal and abiotic effects on egg mortality and hatchling size of turtles: temporal variation in selection over seven years. Functional Ecology 24:857-866.

2009 ⇒

Chandler, C. H., and F. J. Janzen. 2009. The phylogenetic position of the snapping turtles (Chelydridae) based on nucleotide sequence data. Copeia 2009:209-213.

Chandler, C.H., A. LeClere, S. Hayden, and F. J. Janzen. 2009. Population genetics and related biology of the Blanding's turtle (Emydoidea blandingii) in McHenry County, Illinois. Final Report. Illinois Department of Natural Resources. 15 pp.

Chandler, C. H., P. C. Phillips, and F. J. Janzen. 2009. The evolution of sex-determining mechanisms: lessons from temperature-sensitive mutations in sex determination genes in Caenorhabditis elegans. Journal of Evolutionary Biology 22:192-200.

Cordero, G. A. 2009. Encouraging students to utilize museum resources in ecology, evolutionary and conservation biology. Bull. British Ecol. Soc. 40:59-60.

Janzen, F. J., and D. A. Warner. 2009. Parent-offspring conflict and selection on egg size in turtles. Journal of Evolutionary Biology 22:2222-2230.

Schwanz, L. E., R. M. Bowden, R.-J. Spencer, and F. J. Janzen. 2009. Nesting ecology and offspring recruitment in a long-lived turtle. Ecology 90:1709.

2008 ⇒

Bowen, K. D., and F. J. Janzen. 2008. Human recreation and the nesting ecology of a freshwater turtle (Chrysemys picta). Chelonian Conservation and Biology 7:95-100.

Cerda-Ardura, A., F. Soberon-Mobarak, S. E. McGaugh, and R. C. Vogt. 2008. Apalone spinifera atra (Webb and Legler 1960) - black spiny softshell turtle, Cuatrocienegas softshell, tortuga concha blanda, tortuga negra de Cuatrocienegas. Chelonian Research Monographs 5:021.1-021.4.

Howeth, J. G., S. E. McGaugh, and D. A. Hendrickson. 2008. Contrasting demographic and genetic estimates of dispersal in the endangered Coahuilan box turtle: a contemporary approach to conservation. Molecular Ecology 17:4209-4221.

Huey, R. B., and F. J. Janzen. 2008. Climate warming and environmental sex determination in tuatara: the Last of the Sphenodontians? Proceedings of the Royal Society of London B 275:2181-2183.

Janzen, F. J. 2008. Sex determination in Chelydra. Pp. 146-157 in A. C. Steyermark, M. S. Finkler, and R. J. Brooks (eds.), Biology of the Snapping Turtle (Chelydra serpentina). Johns Hopkins University Press, Baltimore, MD.

Kasuga, L. M. C., and F. J. Janzen. 2008. Home range size, movement and habitat use for a population of Blanding's turtles (Emys blandingii) in the Upper Mississippi River National Fish and Wildlife Refuge. Final Report. Illinois Department of Natural Resources. 60 pp.

McGaugh, S. E. 2008. Color variation among habitat types in the spiny softshell turtles (Trionychidae: Apalone) of Cuatrocienegas, Coahuila, Mexico. Journal of Herpetology 42:347-353.

McGaugh, S. E., C. M. Eckerman, and F. J. Janzen. 2008. Molecular phylogeography of Apalone spinifera (Reptilia, Trionychidae). Zoologica Scripta 37:289-304.

McGaugh, S. E., and F. J. Janzen. 2008. The status of Apalone atra populations in Cuatro Cienegas, Coahuila, Mexico: preliminary data. Chelonian Conservation and Biology 7:88-95.

Neuman-Lee, L. A. 2008. One day at Turtle Camp. Big Muddy 8:40-47.

Schwanz, L. E., and F. J. Janzen. 2008. Climate change and temperature-dependent sex determination: can individual plasticity in nesting phenology prevent extreme sex ratios? Physiological and Biochemical Zoology 81:826-834.

Schwanz, L. E., and S. R. Proulx. 2008. Mutual information reveals variation in temperature-dependent sex determination in response to environmental fluctuation, lifespan and selection. Proceedings of the Royal Society of London Biological Sciences 275:2441-2448.

Tucker, J. K., G. L. Paukstis, and F. J. Janzen. 2008. Does predator swamping promote synchronous emergence of turtle hatchlings among nests? Behavioral Ecology 19:35-40.

2007 ⇒

Alacs, E. A., F. J. Janzen, and K. T. Scribner. 2007. Genetic issues in freshwater turtle and tortoise conservation. Chelonian Research Monographs 4:107-123.

Engstrom, T. N., T. Edwards, M. F. Osentoski, and E. M. Myers. 2007. A compendium of PCR primers for mtDNA, microsatellite, and other nuclear loci for freshwater turtles and tortoises. Chelonian Research Monographs 4:124-141.

Janzen, F. J., and J. K. Tucker. 2007. Gary L. Paukstis (1953-2007). Herpetological Review 38:387-388.

Janzen, F. J., J. K. Tucker, and G. L. Paukstis. 2007. Experimental analysis of an early life-history stage: direct or indirect selection on body size of hatchling turtles? Functional Ecology 21:162-170.

Kuo, C.-H., and F. J. Janzen. 2007. Linnaeus Fund Research Report: Longevity, overlapping generations, and conservation of turtle populations. Turtle and Tortoise Newsletter 11:18-23.

McGaugh, S. E, E. A. Alacs, S. V. Edwards, C. R. Feldman, A. Georges, J. W. Sites Jr., and N. Valenzuela. 2007. Molecules to organisms: research applications of modern genetic tools for turtle biology and conservation. Chelonian Research Monographs 4:47-72.

Myers, E. M., J. K. Tucker, and C. H. Chandler. 2007. Experimental analysis of body size and shape during critical life-history events of hatchling slider turtles, Trachemys scripta elegans. Functional Ecology 21:1106-1114.

Paitz, R. T., H. K. Harms, R. M. Bowden, and F. J. Janzen. 2007. Experience pays: offspring survival increases with female age. Biology Letters 3:44-46.

St. Juliana, J. R., and F. J. Janzen. 2007. Can natural phenotypic variances be estimated reliably under homogeneous laboratory conditions? Journal of Evolutionary Biology 20:1406-1414.

2006 ⇒

Janzen, F. J., and P. C. Phillips. 2006. Exploring the evolution of environmental sex determination, especially in reptiles. Journal of Evolutionary Biology 19:1775-1784.

McGaugh, S., D. Hendrickson, G. Bell, H. Cabral, K. Lyons, L. McEachron, and O. Munoz J. 2006. Fighting an aggressive wetlands invader: a case study of giant reed (Arundo donax) and its threat to Cuatro Cienegas, Coahuila, Mexico. Pp. 151-161 in Ma. De Loudes Lozano-Vilano and A. J. Contreras-Balderas (eds.), Studies of North American Desert Fishes: In Honor of E. P. (Phil) Pister, Conservationist. Universidad Autonoma de Nuevo Leon, Mexico.

Mullins, M. A., and F. J. Janzen. 2006. Phenotypic effects of thermal means and variances on smooth softshell turtle (Apalone mutica) embryos and hatchlings. Herpetologica 62:27-36.

Myers, E. M., F. J. Janzen, D. C. Adams, and J. K. Tucker. 2006. Quantitative genetics of plastron shape in slider turtles (Trachemys scripta). Evolution 60:563-572 [cover illustration].

Spencer, R.-J., F. J. Janzen, and M. B. Thompson. 2006. Counterintuitive density-dependent growth in a long-lived vertebrate after removal of nest predators. Ecology 87:3109-3118.

Warner, D. A., J. K. Tucker, N. I. Filoramo, and J. B. Towey. 2006. Claw function of hatchling and adult red-eared slider turtles (Trachemys scripta elegans). Chelonian Conservation and Biology 5:317-320.

2005 ⇒

Bowen, K. D., and F. J. Janzen. 2005. Rainfall and depredation of nests of the painted turtle, Chrysemys picta. Journal of Herpetology 39:649-652.

Bowen, K. D., R.-J. Spencer, and F. J. Janzen. 2005. A comparative study of environmental factors that affect nesting in Australian and North American freshwater turtles. Journal of Zoology 267:397-404.

Harms, H. K., R. T. Paitz, R. M. Bowden, and F. J. Janzen. 2005. Age and season impact resource allocation to eggs and nesting behavior in the painted turtle. Physiological and Biochemical Zoology 78:996-1004.

Janzen, F. J. 2005. Voice of the turtle. Review of "Sea Turtles: A Complete Guide to Their Biology, Behavior, and Conservation." Science 307:211.

Krenz, J. G., G. J. P. Naylor, H. B. Shaffer, and F. J. Janzen. 2005. Molecular phylogenetics and evolution of turtles. Molecular Phylogenetics and Evolution 37:178-191.

Willette, D. A. S., J. K. Tucker, and F. J. Janzen. 2005. Linking climate and physiology at the population level for a key life-history stage of turtles. Canadian Journal of Zoology 83:845-850.

2004 ⇒

Bowden, R. M., H. K. Harms, R. T. Paitz, and F. J. Janzen. 2004. Does optimal egg size vary with demographic stage because of a physiological constraint? Functional Ecology 18:522-529.

Bowen, K. D. 2004. Range extension: Tropidoclonion lineatum. Herpetological Review 35:413.

Bowen, K. D., P. L. Colbert, and F. J. Janzen. 2004. Survival and recruitment in a human-impacted population of ornate box turtles, Terrapene ornata, with recommendations for conservation and management. Journal of Herpetology 38:562-568.

Bowen, K. D., and J. C. Gillingham. 2004. R9 Species Conservation Assessment for Wood Turtle - Glyptemys insculpta (LeConte, 1830). U. S. Forest Service, Eastern Region, Milwaukee, WI.

Janzen, F. J. 2004. Molecular conservation genetics and adaptation. Frontiers in Ecology and the Environment 2:234.

Janzen, F. J., and J. G. Krenz. 2004. Phylogenetics: Which was first, TSD or GSD? Pp. 121-130 in N. Valenzuela and V. A. Lance (eds.), Temperature-Dependent Sex Determination in Vertebrates. Smithsonian Books, Washington, DC.

Kuo, C.-H., and F. J. Janzen. 2004. Genetic effects of a persistent bottleneck on a natural population of ornate box turtles (Terrapene ornata). Conservation Genetics 5:425-437.

St. Juliana, J. R., R. M. Bowden, and F. J. Janzen. 2004. The impact of behavioral and physiological maternal effects on offspring sex ratio in the common snapping turtle, Chelydra serpentina. Behavioral Ecology and Sociobiology 56:270-278.

Valenzuela, N., D. C. Adams, R. M. Bowden, and A. C. Gauger. 2004. Geometric morphometric sex estimation for hatchling turtles: a powerful alternative for detecting subtle sexual shape dimorphism. Copeia 2004:735-742.

2003 ⇒

Ashmore, G. M., and F. J. Janzen. 2003. Phenotypic variation in smooth softshell turtles (Apalone mutica) from eggs incubated in constant versus fluctuating temperatures. Oecologia 134:182-188.

Kuo, C.-H., and F. J. Janzen. 2003. BottleSim: a bottleneck simulation program for long-lived species with overlapping generations. Molecular Ecology Notes 3:669-673.

Morjan, C. L. 2003. Variation in nesting patterns affecting nest temperatures in two populations of painted turtles (Chrysemys picta) with temperature-dependent sex determination. Behavioral Ecology and Sociobiology 53:254-261.

Morjan, C. L. 2003. How rapidly can maternal behavior affecting primary sex ratio evolve in a reptile with environmental sex determination? American Naturalist 162:205-219.

Morjan, C. L., and F. J. Janzen. 2003. Nest temperature is not related to egg size in a turtle with temperature-dependent sex determination. Copeia 2003:366-372.

Starkey, D. E., H. B. Shaffer, R. L. Burke, M. R. J. Forstner, J. B. Iverson, F. J. Janzen, A. G. J. Rhodin, and G. R. Ultsch. 2003. Molecular systematics, phylogeography, and the effects of Pleistocene glaciation in the painted turtle (Chrysemys picta) complex. Evolution 57:119-128.

Valenzuela, N., D. C. Adams, and F. J. Janzen. 2003. Pattern does not equal process: exactly when is sex environmentally determined? American Naturalist 161:676-683.

2002 ⇒

Filoramo, N. I., and F. J. Janzen. 2002. An experimental study of the influence of embryonic water availability, body size, and clutch on survivorship of neonatal red-eared sliders, Trachemys scripta elegans. Herpetologica 58:67-74.

Janzen, F. J. 2002. Temperature and sex. Pp. 116-117 in T. Halliday and K. Adler (eds.), The New Encyclopedia of Reptiles & Amphibians. Oxford University Press, Oxford.

Janzen, F. J., J. G. Krenz, T. S. Haselkorn, E. D. Brodie Jr., and E. D. Brodie III. 2002. Molecular phylogeography of common garter snakes (Thamnophis sirtalis) in western North America: implications for regional historical forces. Molecular Ecology 11:1739-1751.

Janzen, F. J., and C. L. Morjan. 2002. Egg size, incubation temperature, and posthatching growth in painted turtles (Chrysemys picta). Journal of Herpetology 36:308-311.

Janzen, F. J., M. E. Wilson, J. K. Tucker, and S. P. Ford. 2002. Experimental manipulation of steroid concentrations in circulation and in egg yolks of turtles. Journal of Experimental Zoology 293:58-66.

Kolbe, J. J., and F. J. Janzen. 2002. Impact of nest-site selection on nest success and nest temperature in natural and disturbed habitats. Ecology 83:269-281.

Kolbe, J. J., and F. J. Janzen. 2002. Experimental analysis of an early life-history stage: water loss and migrating hatchling turtles. Copeia 2002:220-226.

Kolbe, J. J., and F. J. Janzen. 2002. Spatial and temporal dynamics of turtle nest predation: edge effects. Oikos 99:538-544.

Packard, G. C., M. J. Packard, C. L. Morjan, and F. J. Janzen. 2002. Cold-tolerance of hatchling painted turtles (Chrysemys picta bellii) from the southern limit of distribution. Journal of Herpetology 36:300-304.

Pearse, D. E., F. J. Janzen, and J. C. Avise. 2002. Multiple paternity, sperm storage, and reproductive success of female and male painted turtles (Chrysemys picta) in nature. Behavioral Ecology and Sociobiology 51:164-171.

2001 ⇒

Janzen, F. J. 2001. Review of "Evolutionary Genetics: From Molecules to Morphology." Quarterly Review of Biology 76:351-352.

Janzen, F. J., and C. L. Morjan. 2001. Repeatability of microenvironment-specific nesting behaviour in a turtle with environmental sex determination. Animal Behaviour 62:73-82.

Kolbe, J. J., and F. J. Janzen. 2001. The influence of propagule size and maternal nest-site selection on survival and behaviour of neonate turtles. Functional Ecology 15:772-781.

Morjan, C. L., and J. N. Stuart. 2001. Nesting record of a Big Bend slider, Trachemys gaigeae, and overwintering of the hatchlings in the nest. Southwestern Naturalist 46:230-234.

Morjan, C. L., and N. Valenzuela. 2001. Is ground-nuzzling by female turtles associated with soil surface temperatures? Journal of Herpetology 35:668-672.

Pearse, D. E., C. M. Eckerman, F. J. Janzen, and J. C. Avise. 2001. A genetic analogue of mark-recapture methods for estimating local population size: an approach based on molecular parentage assessments. Molecular Ecology 10:2711-2718.

Pearse, D. E., F. J. Janzen, and J. C. Avise. 2001. Genetic markers substantiate long-term storage and utilization of sperm by female painted turtles. Heredity 86:378-384.

Tucker, J. K., G. L. Paukstis, and F. J. Janzen. 2001. Short-term water potential fluctuations and eggs of the red-eared slider (Trachemys scripta elegans). Transactions of the Illinois State Academy of Science 94:27-35.

Valenzuela, N., and F. J. Janzen. 2001. Nest-site philopatry and the evolution of temperature-dependent sex determination. Evolutionary Ecology Research 3:779-794.

2000 ⇒

Harmon, L. J. 2000. A translocation strategy for confiscated pancake tortoises. Chelonian Conservation and Biology 3:738-743.

Janzen, F. J., J. K. Tucker, and G. L. Paukstis. 2000. Experimental analysis of an early life-history stage: avian predation selects for larger body size of hatchling turtles. Journal of Evolutionary Biology 13:947-954.

Janzen, F. J., J. K. Tucker, and G. L. Paukstis. 2000. Experimental analysis of an early life-history stage: selection on size of hatchling turtles. Ecology 81:2290-2304.

Warner, D. A. 2000. Ecological observations on the six-lined racerunner Cnemidophorus sexlineatus in northwestern Illinois. Transactions of the Illinois State Academy of Science 93:239-248.

Weisrock, D. W., and F. J. Janzen. 2000. Comparative molecular phylogeography of North American softshell turtles (Apalone): implications for regional and wide-scale historical evolutionary forces. Molecular Phylogenetics and Evolution 14:152-164.

1999 ⇒

Filoramo, N. I., and F. J. Janzen. 1999. Effects of hydric conditions during incubation on overwintering hatchlings of the red-eared slider turtle (Trachemys scripta elegans). Journal of Herpetology 33:29-35.

Kolbe, J. J. 1999. Size and demographic structure of an isolated population of western hognose snakes, Heterodon nasicus, in northwestern Illinois. Bulletin of the Chicago Herpetological Society 34:149-152.

Kolbe, J. J., L. J. Harmon, and D. A. Warner. 1999. New state record lengths and associated natural history notes for some Illinois snakes. Transactions of the Illinois State Academy of Science 92:133-135.

O'Steen, S., and F. J. Janzen. 1999. Embryonic temperature affects metabolic compensation and thyroid hormones in hatchling snapping turtles. Physiological and Biochemical Zoology 72:520-533.

Paukstis, G. L., J. K. Tucker, A. M. Bronikowski, and F. J. Janzen. 1999. Survivorship of aerially-exposed zebra mussels (Dreissena polymorpha) under laboratory conditions. Journal of Freshwater Ecology 14:511-517.

Reed, W. L., and F. J. Janzen. 1999. Natural selection by avian predators on size and colour of a freshwater snail (Pomacea flagellata). Biological Journal of the Linnean Society 67:331-342.

Tucker, J. K., N. I. Filoramo, and F. J. Janzen. 1999. Size-biased mortality due to predation in a nesting freshwater turtle, Trachemys scripta. American Midland Naturalist 141:198-203.

Tucker, J. K., and D. A. Warner. 1999. Microgeographic variation in response of red-eared slider (Trachemys scripta elegans) embryos to similar incubation environments. Journal of Herpetology 33:549-557.

Weisrock, D. W., and F. J. Janzen. 1999. Thermal and fitness-related consequences of nest location in painted turtles (Chrysemys picta). Functional Ecology 13:94-101.

1998 ⇒

Janzen, F. J., and H. S. Stern. 1998. Logistic regression for empirical studies of multivariate selection. Evolution 52:1564-1571.

Janzen, F. J., M. E. Wilson, J. K. Tucker, and S. P. Ford. 1998. Endogenous yolk steroid hormones in turtles with different sex-determining mechanisms. General and Comparative Endocrinology 111:306-317.

Kolbe, J. J. 1998. Terrapene ornata ornata (Ornate Box Turtle). Diet. Herpetological Review 29:235.

Tucker, J. K., N. I. Filoramo, G. L. Paukstis, and F. J. Janzen. 1998. Residual yolk in captive and wild-caught hatchlings of the red-eared slider turtle (Trachemys scripta elegans). Copeia 1998:488-492.

Tucker, J. K., N. I. Filoramo, G. L. Paukstis, and F. J. Janzen. 1998. Response of red-eared slider, Trachemys scripta elegans, eggs to slightly differing water potentials. Journal of Herpetology 32:124-128.

Tucker, J. K., and F. J. Janzen. 1998. Order of oviposition and egg size in the red-eared slider turtle (Trachemys scripta elegans). Canadian Journal of Zoology 76:377-380.

Tucker, J. K., F. J. Janzen, and G. L. Paukstis. 1998. Variation in carapace morphology and reproduction in the red-eared slider Trachemys scripta elegans. Journal of Herpetology 32:294-298.

Tucker, J. K., G. L. Paukstis, and F. J. Janzen. 1998. Annual and local variation in reproduction in the red-eared slider, Trachemys scripta elegans. Journal of Herpetology 32:515-526.

Tucker, J. K., and D. A. Warner. 1998. Apalone spinifera (Spiny Softshell) Reproduction. Herpetological Review 29:234.

Warner, D. A. 1998. Overcrowding effects on larval red-eyed treefrogs (Agalychnis callidryas). Bulletin of the Chicago Herpetological Society 33:212-214.

Warner, D. A. 1998. A preliminary report on a population of Cnemidophorus sexlineatus in northwestern Illinois. Bulletin of the Chicago Herpetological Society 33:6-8.

Weisrock, D. W., T. S. Haselkorn, and F. J. Janzen. 1998. Lack of genetic variation in cytochrome b in a population of smooth softshell turtles. Journal of the Iowa Academy of Science 105:158-160.

1997 ⇒

Janzen, F. J., S. L. Hoover, and H. B. Shaffer. 1997. Molecular phylogeography of the western pond turtle (Clemmys marmorata): preliminary results. Linnaeus Fund research report. Chelonian Conservation and Biology 2:623-626.

Paukstis, G. L., F. J. Janzen, and J. K. Tucker. 1997. Comparative survivorship of sympatric native North American gastropods (Anguispira, Mesodon, Physella, Pleurocera) and an introduced bivalve (Dreissena) exposed to freezing temperatures. Veliger 40:67-70.

Tucker, J. K. and N. I. Filoramo. 1997. Fences and nesting red-eared sliders. Bulletin of the Chicago Herpetological Society 32:218-219.

Tucker, J. K., and F. J. Janzen. 1997. Incidence of twinning in turtles. Copeia 1997:166-173.

Tucker, J. K., F. J. Janzen, and G. L. Paukstis. 1997. Response of embryos of the red-eared turtle (Trachemys scripta elegans) to experimental exposure to water-saturated substrates. Chelonian Conservation and Biology 2:345-351.

Tucker, J. K., C. H. Theiling, F. J. Janzen, and G. L. Paukstis. 1997. Sensitivity to aerial exposure: potential of system-wide drawdowns to manage zebra mussels in the Mississippi River. Regulated Rivers 13:479-487.

Tucker, J. K. and D. A. Warner. 1997. Distributional note: Sternotherus odoratus. Herpetological Review 28:209.

Warner, D. A. 1997. An overview on the evolution of the family Iguanidae. Iguana Times 6:57-65.

1996 ⇒

Brodie, E. D., III, and F. J. Janzen. 1996. On the assignment of fitness values in statistical analyses of selection. Evolution 50:437-442.

Janzen, F. J. 1996. Is temperature-dependent sex determination in reptiles adaptive? Trends in Ecology and Evolution 11:253.

Packard, G. C., and F. J. Janzen. 1996. Interpopulational variation in the cold-tolerance of hatchling painted turtles. Journal of Thermal Biology 21:183-190.

Paukstis, G. L., F. J. Janzen, and J. K. Tucker. 1996. Response of aerially-exposed zebra mussels (Dreissena polymorpha) to subfreezing temperatures. Journal of Freshwater Ecology 11:513-519.

Tucker, J. K., F. J. Janzen, and G. L. Paukstis. 1996. Laboratory survivorship of aerially exposed pond snails (Physella integra) from Illinois. Transactions of the Illinois State Academy of Science 89:225-231.

1995 ⇒

Brodie, E. D., III, and F. J. Janzen. 1995. Experimental studies of coral snake mimicry: generalized avoidance of banded snake patterns by free-ranging avian predators. Functional Ecology 9:186-190.

Brodie, E. D., III, A. J. Moore, and F. J. Janzen. 1995. Visualizing and quantifying natural selection. Trends in Ecology and Evolution 10:313-318.

Janzen, F. J. 1995. Experimental evidence for the evolutionary significance of temperature-dependent sex determination. Evolution 49:864-873.

Janzen, F. J., J. C. Ast, and G. L. Paukstis. 1995. Influence of the hydric environment and clutch on eggs and embryos of two sympatric map turtles. Functional Ecology 9:913-922.

Janzen, F. J., and E. D. Brodie III. 1995. Visually-oriented foraging in a natural population of herbivorous lizards (Ctenosaura similis). Journal of Herpetology 29:132-136.

1994 and before ⇒

Janzen, F. J. 1994. Vegetational cover predicts the sex ratio of hatchling turtles in natural nests. Ecology 75:1593-1599.

Janzen, F. J. 1994. Climate change and temperature-dependent sex determination in reptiles. Proceedings of the National Academy of Sciences USA 91:7487-7490.

Janzen, F. J. 1993. An experimental analysis of natural selection on body size of hatchling turtles. Ecology 74:332-341.

Janzen, F. J. 1993. The influence of incubation temperature and family on eggs, embryos, and hatchlings of the smooth softshell turtle (Apalone mutica ). Physiological Zoology 66:349-373.

Paukstis, G. L., and F. J. Janzen. 1993. The status and biogeography of the three-toed box turtle, Terrapene carolina triunguis, in Illinois. Transactions of the Illinois State Academy of Science 86:173-177.

Janzen, F. J. 1992. Heritable variation for sex ratio under environmental sex determination in the common snapping turtle (Chelydra serpentina ). Genetics 131:155-161.

Janzen, F. J., G. L. Paukstis, and E. D. Brodie III. 1992. Observations on basking behavior of hatchling turtles in the wild. Journal of Herpetology 26:217-219.

Janzen, F. J., and G. L. Paukstis. 1991. A preliminary test of the adaptive significance of environmental sex determination in reptiles. Evolution 45:435-440.

Janzen, F. J., and G. L. Paukstis. 1991. Environmental sex determination in reptiles: ecology, evolution, and experimental design. Quarterly Review of Biology 66:149-179.

Janzen, F. J., G. C. Packard, M. J. Packard, T. J. Boardman, and J. R. zumBrunnen. 1990. Mobilization of lipid and protein by embryonic snapping turtles in wet and dry environments. Journal of Experimental Zoology 255:155-162.

Paukstis, G. L., and F. J. Janzen. 1990. Sex determination in reptiles: summary of effects of constant temperatures of incubation on sex ratios of offspring. Smithsonian Herpetological Information Service 83:1-28.

Janzen, F. J., and E. D. Brodie III. 1989. Tall tails and sexy males: sexual behavior of rough-skinned newts (Taricha granulosa ) in a natural breeding pond. Copeia 1989:1064-1067.

Paukstis, G. L., R. D. Shuman, and F. J. Janzen. 1989. Supercooling and freeze tolerance in hatchling painted turtles (Chrysemys picta ). Canadian Journal of Zoology 67:1082-1084.

Janzen, F. J., and G. L. Paukstis. 1988. Environmental sex determination in reptiles. Nature 332:790.

McAuliffe, J. R., and F. J. Janzen. 1986. Effects of intraspecific crowding on water uptake, water storage, apical growth, and reproductive potential in the sahuaro cactus, Carnegiea gigantea. Botanical Gazette 147:334-341.


Janzen Lab Software

Selection Analysis
SAS program, data file, and output illustrating the use of logistic regression with appropriate transformation for analyses of natural selection.
Software by Chih-Horng Kuo
Software developed by Chih-Horng Kuo (former graduate student), including BottleSim (Kuo & Janzen 2003).

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