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Justin D. Congdon

Savannah River Ecology Laboratory
Drawer E
Aiken, South Carolina 29802
Phone (803) 725-5341
congdon@srel.edu

Updated: May 2001

BIRTH DATE  5 January 1941.

MILITARY United States Navy, 1959-1962, Honorable Discharge.

EDUCATION

  • A.A.  Victor Valley College, Victorville, California, 1966
  • B.S.   California State Polytechnic University, San Luis Obispo, California, 1969
  • M.S.  California State Polytechnic University, San Luis Obispo, California, 1971
  • Ph.D. Arizona State University, Tempe, Arizona, 1977

POST-DOCTORAL EXPERIENCE

  • Post-doctoral Scholar, Museum of Zoology, University of Michigan, 1977-1980.         Advisor,  Dr. Donald W. Tinkle.

  • Post-doctoral Scholar, Savannah River Ecology Laboratory, Drawer E, Aiken, South Carolina, 1980-1984.  Advisor, Dr. J. Whitfield Gibbons.

CURRENT POSITIONS

  • Senior Research Ecologist, Savannah River Ecology Laboratory, Drawer E, Aiken, South Carolina, 1990 - present.

  • Associate Research Ecologist,  Savannah River Ecology Laboratory, Drawer E, Aiken, South Carolina, 1985-1990.

  • Adjunct Research Investigator, Museum of Zoology, University of Michigan, Ann Arbor, Michigan, 1981 - present.

  • Adjunct Senior Research Ecologist, Institute of Ecology, University of Georgia, Athens, Georgia, 1985 - present.

  • Adjunct Professor, Department of Biological Sciences, University of South Carolina, Columbia, SC, 1998 - present.

  • Adjunct Professor, Zoology Department, Arizona State University, Tempe, AZ, 1999 - present.

  • Adjunct Professor, Zoology Department, University of Guelph, Guelph, Ontario, Canada, 1999 - present.

PAST ADJUNCT POSITIONS

  • Adjunct Professor, Department of Aquaculture, Fisheries and Wildlife, Clemson University, Clemson, South Carolina, 1982-1988.

  • Adjunct Senior Research Ecologist, Zoology Department, University of Tennessee, Knoxville, Tennessee.  1984-1990.

GRANTS

  • NSF Predoctoral Grant for Field Research, 1972. $3,700.

  • NSF Grant, Life History Characteristics of Reptiles: Ecological and Evolutionary Perspectives of Long-Lived Species 1979-1983. $146,395.

  • American Philosophical Society Grant, Analysis of long-term lizard life history studies made by Dr. Donald W. Tinkle, 1981. $760.

  • NSF Grant, Life History Characteristics and Ecology of Turtles: Evolutionary Perspectives on Long-lived Organisms. 1984-1987. $121,000.

  • NSF Grant, Evolution of Delayed Sexual Maturity in Turtles. 1991-1994. $136,000.

  • EPA Grant, Global Change Research Program. 1993-1995.  Comparative Risk Assessment of Climate Change and Other Anthropogenic Stresses: Habitat and Biological Diversity on the Savannah River Site, South Carolina.  R. Pullman PI, $578,818.  

  • DOE- Environmental Management Science Program. 1996-1999.  Determining Significant Endpoints for Ecological Risk Analyses.  With Dr. Thomas Hinton (SREL), Dr. Chris Rowe (SREL), Mr. David Scott (SREL), and Dr. Ward Wicker (Colorado State University), and Dr. Joel Bedford (Colorado State University). $897,666

  • NSF Dissertation Improvement Grant 1997-1998.   Experimental Tests of the Parental Investment in Care Hypothesis. With Rebecca Yeomans (University of Georgia). $11,000

  • EPA Star Grant. 1999-2000, Coal Combustion Waste: New Perspectives on an Old Problem. $67,000.  With Dr. Christopher Rowe (University of Maryland, Chesapeake Bay Laboratory) and William Hopkins (Savannah River Ecology Laboratory)

HONORS AND AWARDS

  • 1965.  Outstanding Scholarship Award, Kiwanis Club, Victor Valley College.

  • 1972.  Summer Fellowships for Outstanding Teaching Assistants.

  • 1973.  Summer Fellowships for Outstanding Teaching Assistants.

  • 1974.  Graduate Fellowship, Arizona State University.

  • 1993.  Victor Valley College Alumni Hall of Fame.

  • 1994.  Education Medal of Honor, Student Alumni, San Bernardino County Community College.

  • 1994.  California Community Colleges, Distinguished Alumni.

  • 2000.  Longevity Award, Foundation IPSEN, France.

THESIS AND DISSERTATION

  • M.S. Thesis:  Effect of Habitat Quality on Distributions of Three Sympatric Species of Desert Rodents.

  • Ph.D. Dissertation:  Energetics of the Montane Lizard Sceloporus jarrovi: A Measurement of Reproductive Effort.

TEACHING EXPERIENCE

General Biology
General Zoology
General Physiology
Evolution of Life Histories
Evolutionary Ecology

STUDENTS

Committee Chair:  MS  Degree

Julie Wallin             1990                 University of Georgia, Athens, GA
Mark Komoroski   1996                 University of Georgia, Athens, GA
Roy Nagle                1997                 University of South Carolina, Columbia, SC
Owen Kinney          1999                 University of Georgia, Athens, GA
Brandon Staub      2000                 University of Georgia, Athens, GA

Committee Member:  MS

Hal Avery                   1986                 State University of New York, Buffalo, NY
Anita Caudle              1988                 University of Georgia, Athens, GA
Matthew Osentoski 1993                 East Carolina University, Greenville, NC
Rebecca Yeomans   1993                 University of Georgia, Athens, GA
John Lee                      1996                 University of Georgia, Athens, GA
Willy Hollett                                          University of Guelph, Guelph, Ontario, Canada
Jason Samson                                       University of Guelph, Guelph, Ontario, Canada

Committee Chair or Co-Chair: Ph.D.

 Christopher Beck            1998                 University of Georgia, Athens, GA
  Rebecca Yeomans         1999                 University of Georgia, Athens, GA
  Miriam Benabib              1990                 University of Georgia, Athens, GA
  Mark Komoroski                                        University of Georgia, Athens, GA
  Jacquline Litgus                                         University of South Carolina, Columbia, SC
  William Hopkins                                         University of South Carolina, Columbia, SC

Committee Member: Ph.D.

 Mary Mendonca         1986      University of California, Berkeley, CA
 Scott Eckert                  1989      University of Georgia, Athens, GA
 Edward Michaud         1989     University of Tennessee, Knoxville, TN
 David Galbraith           1989      Queens University, Kingston, Canada
 Jeffrey Lovich              1990     University of Georgia, Athens, GA
 Mark Belk                       1992      University of Georgia, Athens, GA
 Peter Niewiarowski    1992      University of Pennsylvania, Philadelphia, PA
 Steven Beaupre            1993      University of Pennsylvania, Philadelphia, PA
 Robert Fischer             1995       University of South Carolina, Columbia, SC
 Vincent Burke              1995       University of Georgia, Athens, GA
 John Krenz                   1995        University of Georgia, Athens, GA
 Willem Roosenburg  1995        University of Pennsylvania, Philadelphia, PA
 Michael Angeletta     1998        University of Pennsylvania, Philadelphia, PA
 Kurt Buhlman              1998        University of Georgia, Athens, GA
 Christopher Tatara    1999       University of Georgia, Athens, GA
 Mark Mills                                       University of Georgia, Athens, GA
 James Novak                                  University of Georgia, Athens, GA
 Kim Orell                                       Virginia State Polytechnic University, Blacksburg, VA
 Matthew Osentoski                        Florida International University, Miami, FL
 Sarah Holt                                         University of Guelph, Guelph, Ontario, Canada

POST-DOCTORAL ASSISTANTS  SUPERVISED

 Roger Anderson            1989-1991
 David Schultz                1990-1992
 Peter Niewiarowski       1993-1995
 Christopher Rowe         1995-1997
 Michael Dorcas             1995-1997

RESEARCH INTERESTS

My research interests and activities encompass the major areas of : 1) physiology, population biology and evolutionary ecology, and 2) toxicology of heavy metals associated with coal combustion waste products, and 3) toxicology of mixed waste such as low level radiation and heavy metals.  I am interested in the physiological and ecological processes combine to shape reproductive, demographic, and life history strategies in natural and contaminated environments.  I have conducted field and laboratory investigations of energetics, growth, demography and reproductive biology of vertebrates.

RESEARCH EXPERIENCE

  • Senior Research Ecologist, Savannah River Ecology Laboratory, Aiken, South Carolina. 1990-present.

  • Associate Research Ecologist, Savannah River Ecology Laboratory, Aiken, South Carolina. 1985-1990.

  • Principal Investigator, University of Michigan’s E. S. George Reserve study of turtle life histories. 1975 - 2000.

  • Co-Principal Investigator, El Coronado Ranch study of life history and demography of the Sonoran mud turtle.  1990 - 2000.

  • Post-doctoral Scholar, Savannah River Ecology Laboratory, Aiken, South Carolina. 1980-1984.

  • Post-doctoral Scholar, Museum of Zoology, University of Michigan, 1976-1979.

  • Research Assistant, Museum of Zoology, University of Michigan, 1972.

  • Research Contract, California Fish and Game Department, Endangered Species Status, 1971.

  • Research Assistant, California Polytechnic University, 1970.

ADMINISTRATIVE EXPERIENCE

  • Coordinator, General Physiology, University of Michigan, 1978-1979.

  • Administration of NSF Grant, (two full-time and four part-time research assistants).  1980-1984, 1984-1986, 1991-1995.

  • Administration of Physiological Ecology Group, Savannah River Ecology Laboratory, (one research coordinator, two full-time and two part-time research assistants, and one post-doc). 1985-present.

PROFESSIONAL SOCIETIES

  • AAZPA, Freshwater Turtle Advisory Panel

  • Chiricahua Regional Council

  • Chelonian Conservation and Biology Society

  • Ecological Society of America

  • Herpetologists' League (Life member)

  • Institute of Ecology, University of Georgia

  • IUCN/SSC Tortoise and Freshwater Turtle Specialist Group

  • Sociedad Herpetologica Mexicana

  • Society of the Study of Amphibians and Reptiles

  • Society of Sigma Xi

APPOINTMENTS IN PROFESSIONAL ORGANIZATIONS

  • Editorial Board, Society for the Study of Amphibians and Amphibians, Journal of Herpetology

  • Editorial Borrd, Chelonian Conservation and Biology

  • AAZPA, Freshwater Turtle Advisory Panel

  • Chelonian Advisory Group

  • IUCN Tortoise and Freshwater Turtle Specialist Group

  • Reviewer: DOE, EPA, NSF, National Geographic Society, Natural Sciences and Engineering Research Council of Canada

  • Reviewer: American Midland Naturalist, American Naturalist, Animal Conservation, Canadian Journal of Zoology, Canadian Field Naturalist, Chelonian Conservation and Biology, Conservation Biology, Copeia, Ecology, Evolution, Functional Ecology, Herpetologica, Journal of Herpetology, Journal of Mammalogy, Science, SETAC.

OAK RIDGE TRAVELING LECTURES

            Berry College, Rome, GA
            Eastern Carolina University
            Ohio State University, Columbus, OH
            Oklahoma State University, Stillwater, OK
            Purdue University, Fort Wayne, IN
            Randolph Macon College, VA
            Southwest Texas University, San Marcos, TX
            University of Eastern Tennessee
            Washington-Lee University, VA

INVITED SEMINARS

            1st Donald W. Tinkle Memorial Lecture, University of Michigan, Ann Arbor, MI
            1st World Congress of Herpetology, Canterbury, England (3)
            2nd World Congress of Herpetology, Adelaide, Australia
            3rd Donald W. Tinkle Memorial Lecture, University of Michigan, Ann Arbor, MI
            All Florida Herpetology Conference, Gainesville, FL
            Arizona State University, Tempe, AZ (2)
            Auburn University, Auburn, AL
            Bowling Green University, OH
            California State Polytechnic University, San Luis Obispo, CA
            Clemson University, Clemson, SC
            Desert Tortoise Council Meetings (4)
            Duke University, Durham, NC
            Eastern Illinois University, Charleston, IL
            Georgia Southern University, Statesboro, GA
            North Carolina State University, Raleigh, NC
            Pennsylvania State University, College Park, PA
            Powdermill Freshwater Turtle Meetings I, II, III, IV
            Queen's University, Kingston, Canada
            Sea Turtle Meetings (2)
            Southwestern Louisiana University
            Tennessee State University, Memphis, TN
            Texas Tech University, Lubbock, TX
            Universidad Nacional Autonoma de Mexico, Mexico City (2)
            University of Florida, Gainesville, FL (3)
            University of Georgia, Athens, GA (7)
            University of Guelph, Guelph, Canada
            University of Kentucky, Lexington, KY
            University of Michigan, Ann Arbor, MI (3)
            University of Michigan, Dearborn, MI
            University of Nebraska, Lincoln, NE
            University of North Carolina, Greensboro, NC
            University of Ohio, Miami, OH
            University of Oklahoma, Norman, OK
            University of South Florida, Tampa, FL
            University of Tennessee, Knoxville, TN (3)
            University of Texas at Arlington, Arlington, TX
            Utah State University, Provo, UT (2)
            Victor Valley College, Victorville, CA
            Virginia Polytechnical Institute and State University, Blacksburg, VA
            Wilkes College, Wilkes Barre, PA

SYMPOSIA ORGANIZED

  • 1989.    Nutrition and Energetics in Desert Tortoises.  Desert Tortoise Council Meeting, Mesquite NV.  Talk: “Why desert tortoises eat dirt”

  • 1989.    Evolution of Life Histories of Turtles,.  First World Congress of Herpetology, Canterbury, England. Talk:  “Life history evolution in turtles”

  • 1991.   Third Meeting of the Freshwater Turtle Research Group, Powdermill III.  Savannah River Ecology Laboratory.  Talk:  “Reproduction and Nesting Ecology of Painted Turtles”

  • 1997     Resource Allocation Processes: the Connection Between Individual and Population Levels of Biological  Organization:. Savannah River Ecology Laboratory Symposia Series IV.   Talk:  “Allocation to growth by juveniles: evolution of delayed sexual maturity in painted turtles”

SYMPOSIA PARTICIPATION

  • 1982. "Reproduction energetics of painted turtles."  Reproduction in Reptiles.  Joint meeting of the Society for the Study of Amphibians and Reptiles and the Herpetologists' League. Memphis, TN. 

  • 1987. “Proximate and evolutionary constraints on energy relations of reptiles”   Bioenergetics of Organisms in Extreme Environments.  American Society of Zoologists Meeting.

  • 1989. "Pre-ovulatory parental investment in care by reptiles"   Egg Tricks.  First World Congress of Herpetology. Canterbury, England.

  • 1989. "A long-term study of turtles on the E. S. George Reserve in southeastern Michigan"  Long-Term Studies: First World Congress of Herpetology. Canterbury, England.

  • 1989. “Life history evolution in turtles”  Evolution of Turtle Life Histories. First World Congress of Herpetology. Canterbury, England.

  • 1989. "Demographics of common snapping turtles (Chelydra serpentina): implications for conservation and management of long-lived organisms”   Long-Term Studies and Conservation biology. American Society of Zoologists Meeting. Vancouver, Canada.

  • 1992."Senescence in turtles: evidence from three decades of study on the E. S. George Reserve” Senescence in Organisms in Natural Populations:. American Association of Gerontologists. Washington, DC.

  • 1993. "Parental investment strategies in reptiles”  Parental Investment in Reptiles. Second World Congress of Herpetology. Adelaide, Australia.

  • 1994. "Consequences of variation in age at sexual maturity to the demographics of painted turtles (Chrysemys picta)"   Interfaces Between Individuals and Populations: Joint Annual Meeting of the Herpetologists' League and the Society for the Study of Amphibians and Reptiles. Athens, GA. 

  • 1997. “Applying the concept of  ‘feasible demography’ to conservation and  management of endangered species Endangered Species of Michigan.   Michigan Academy of Arts and Sciences.  Grand Rapids, MI.

  • 1997. “Applying the concept of ‘feasible demography’ to conservation and  management of long-lived organisms”  Life Histories of Turtles.  Joint annual meeting of the Herpetologists League and the Society  for the Study of Amphibians and Reptiles.  Seattle, WA.

  • 1997. “Juvenile and adult survivorship rates of turtles: life history trait values that limit harvest” Sustainable Yield and the Conservation of Long-Lived Vertebrates.  Joint annual meeting of the Herpetologists League and the Society  for the Study of Amphibians and Reptiles.  Seattle, WA.

  • 1997. “Oviductal Sperm Storage as a Reproductive Tactic of Turtles”   Reproductive Biology.  London, England.

  • 1998. “Evidence for actuarial senescence in turtles”   Workshop on Organisms with Negligible Senescence II.   Ethel Percy Andrus Gerontology Center, University of Southern California.

  • 1999. “Evidence for reproductive senescence in turtles”  Workshop on Organisms with Negligible Senescence III.  Ethel Percy Andrus Gerontology Center, University of Southern California.

  • 1999.    “Resource-allocation based life histories: A conceptual basis for studies of ecological toxicology”  Bioenergetics and Toxicology.  SETAC Meetings, Philadelphia, PA.

  • 1999. “Hypotheses of Aging in a Long-lived Vertebrate (Blanding’s turtle, Emydoidea blandingii)” Symposium on Slowly Aging Organisms.  Ethel Percy Andrus Gerontology Center, University of Southern California. 

  • 2000. “Resource Allocation Based Life-Histories of Reptiles: Concepts for Studies of Sub-Lethal Effects of Contaminants Toxicology of Reptiles”  Society of Environmental Toxicologists and Chemists Meetings, Nashville, TN.

TECHNICAL REPORTS

  • 1971. Congdon, J.D. Population estimate and distribution of the Morro Bay kangaroo rat.  California Department of Fish and Game Wildlife Management. Br. Admin. Rpt. No. 71-11, mimeographed. 16 pp.

  • 1987. Congdon, J.D., M.V. Plummer, M.E. Seidel, and L.R. Swingland. An assessment of the sufficiency and accuracy of available data regarding the status of the Flattened Musk Turtle (Sternotherus depressus).  Report to the director of the U.S. Fish and Wildlife Service, U.S. Department of the Interior. Washington, DC 20240.

PUBLICATIONS (PAPERS)
A.  Published.

1974.  Congdon, J.D., L.J. Vitt and W.W. King. Geckos: adaptive significance and energetics of tail autotomy. Science 184:1380-1397.

1974.  Congdon, J.D. Effect of habitat quality on distributions of three sympatric species of desert rodents. Journal of Mammalogy 55:659-662.

1974.  Vitt, L.J., J.D. Congdon, J.E. Platz and A.C. Hulse. Territorial aggressive encounters and tail breaks in the lizard Sceloporus magister. Copeia 1974:990-993.

1975.   Congdon, J.D., L.J. Vitt, J.E. Platz and A.C. Hulse. A portable rapid injector for preserving fish, amphibian and reptile specimens in the field. Copeia 1975:183.

1975.  Congdon, J.D. and A. Roest. Status of the endangered Morro Bay kangaroo rat. Journal of Mammalogy 56:679-683.

1977.  Vitt, L.J., J.D. Congdon and N.A. Dickson. Adaptive strategies and energetics of tail autotomy in lizards. Ecology 55:326-337.

1978.   Congdon, J.D., L.J. Vitt and N.F. Hadley. Parental investment: comparative reproductive energetics in bisexual and unisexual lizards, genus Cnemidophorus. American Naturalist 12:595-608.

1978.    Vitt, L.J. and J.D. Congdon. Body shape, reproductive effort, and relative clutch mass in lizards: resolution of a paradox. American Naturalist 112:595-608.

1978.   Congdon, J.D., W.W. King and K.A. Nagy. Validation of the HTO-18 method for determination of C02 production of lizards (genus Sceloporus). Copeia 1978:360-361.

1979.    Congdon, J.D., R.E. Ballinger and K.A. Nagy. Energetics and water relations of free-roaming winter aggregated lizards (Sceloporus jarrovi). Ecology 60:3-35.

1980.   Ballinger, R.E. and J.D. Congdon. Food resource limitation of body growth rates in Sceloporus scalaris (Sauria: Iguanidae). Copeia 1980:921-923.

1981.    Ballinger, R.E. and J.D. Congdon. Population ecology and life history strategy of a montane lizard (Sceloporus scalaris) in southeastern Arizona. Journal of Natural History 15:213-222.

1981.   Congdon, J.D., L.J. Vitt and N.F. Hadley. Reply to Schall. American Naturalist 117:217-222.

1981.   Tinkle, D.W., J.D. Congdon and P.C. Rosen. Nesting frequency and success: implications for the demography of painted turtles. Ecology 62:1426-1432.

1982.   Congdon, J.D. and D.W. Tinkle. Reproductive energetics of the painted turtle (Chrysemys picta). Herpetologica 37:228-237.

1982.    Congdon, J.D., L.J. Vitt, R.C. van Loben Sels and R.D. Ohmart. The ecological significance of water flux rates in arboreal desert lizards of the genus Urosaurus. Physiological Zoology 55:317-322.

1982.     Congdon, J.D. and D.W. Tinkle. Energy expenditure in free-ranging sagebrush lizards (Sceloporus graciosus) at high elevations. Canadian Journal of Zoology 60:1412-1416.

1983.     Congdon, J.D., J.W. Gibbons and J.L. Greene. Parental investment in the chicken turtle (Deirochelys reticularia). Ecology 64:419-425.

1983.    Fiala, K. and J.D. Congdon. Energetic consequences of sexual dimorphism in nestling red-winged blackbirds. Ecology 64:642-647.

1983.    Congdon, J.D., D.W. Tinkle and P.C. Rosen. Egg components and utilization during development in aquatic turtles. Copeia 1983:264-268.

1983.    Congdon, J.D. and J.W. Gibbons. Relationships of reproductive characteristics to body size in Pseudemys scripta. Herpetologica 39:147-151.

1983.    Congdon, J.D., D.W. Tinkle, G.L. Breitenbach and R.C. van Loben Sels. Nesting ecology and hatching success in the Blanding's turtle Emydoidea blandingi. Herpetologica 39:417-429.

1983.    Gibbons, J.W., J.L. Greene and J.D. Congdon. Drought-related responses of aquatic turtle populations. Journal of Herpetology 17:242-246.

1984.     Breitenbach, G.L., J.D. Congdon and R.C. van Loben Sels. Winter temperatures of Chrysemys picta nests in Michigan: effects on hatchling survival. Herpetologica 40:76-81.

1984.     Morreale, S., J.W. Gibbons and J.D. Congdon. Significance of activity and movement in the yellow-bellied slider turtle (Pseudemys scripta). Canadian Journal of Zoology 62:1038-1042.

1985.     Congdon, J.D. and J.W. Gibbons. Egg components and reproductive characteristics of turtles: relationships to body size. Herpetologica  41:194-205.

1985.    Licht, P., G.L. Breitenbach and J.D. Congdon. Seasonal cycles in testicular activity, gonadotropin and thyroxine in the painted turtle, Chrysemys picta, under natural conditions. General and Comparative Endocrinology  59:130-139.

1985.    Lamb, T. and J.D. Congdon. Ash content: relationships to leathery and brittle egg shell types of turtles. Journal of Herpetology 19:527-530.

1986.    Congdon, J.D., J.L. Greene and J.W. Gibbons. Biomass of freshwater turtles: a geographic comparison. The American Midland Naturalist 115:165-173.

1987.    Congdon, J.D., G.L. Breitenbach, R.C. van Loben Sels and D.W. Tinkle. Reproduction, nesting ecology, and hatchling success of snapping turtles (Chelydra serpentina) in southeastern Michigan. Herpetologica  43:39-54.

1987.     Congdon, J.D. and J.W. Gibbons. Morphological constraint on egg size: a challenge to optimal egg size theory. Proceedings of the National Academy of Science 16:4145-4147.

1988.    Congdon, J.D. Toward more conceptual and theoretical issues. Book Review of  New Directions in Ecological Physiology. Ecology  69:1643.

1989.    Congdon, J.D. and R.E. Gatten, Jr. Movements and energetics of nesting Chrysemys picta. Herpetologica  45:94-100.

1989.    Congdon, J.D. Proximate and evolutionary constraints on energy relations of reptiles. Physiological Zoology  62:356-373.

1989.    Congdon, J.D. and J.W. Gibbons. Biomass production of freshwater turtles: a geographic comparison. Sharitz, R.R. and J.W. Gibbons (eds.) Freshwater Wetlands and Wildlife Symposium DOE-CONF8603101 Office of Scientific and Technical Information, U.S. Department of Energy, Oak Ridge, TN.

1989.    Congdon, J.D. and R.E. Gatten. Activity of overwintering box turtles, Terrapene ornata. Journal of Herpetology 23:179-181.

1989.    Congdon, J.D. and J.W. Gibbons. Post-hatching yolk reserves in American alligators. Herpetologica  45:305-309.

1991.    Fischer, R.U.,  F.J. Mazzotti, J.D. Congdon and R.E. Gatten, Jr. Post-hatching yolk reserves: parental investment in American alligators from Louisiana.   Journal of Herpetology  25:253-256.

1991.     Congdon, J.D. and R.C. van Loben Sels. Growth and body size in the Blanding's turtles (Emydoidea blandingi): relationships to reproduction. Canadian Journal of Zoology  69:239-245.

1991.    Gatten, R.E., Jr., J.D. Congdon, F.J. Mazzotti and R.U. Fischer. Glycoloysis and swimming performance in juvenile alligators. Journal of Herpetology 25:406-411.

1992.    Benabib, M. and J.D. Congdon. Metabolic and water flux rates of free-ranging tropical lizards (Sceloporus variabalis). Physiological Zoology 65:788-802.

1993.    Congdon, J.D. and R.C. van Loben Sels. Reproductive characteristics and body size: relationships with attainment of sexual maturity and age in Blanding's turtles (Emydoidea blandingi). Journal of Evolution and Biology 6:547-557.

1993.    Congdon, J.D., S.W. Gotte and R.W. McDiarmid. Ontogenetic changes in habitat use by juvenile turtles (Chelydra serpentina and Chrysemys picta). Canadian Field Naturalist  6:241-248.

1993.    Plummer, M.V. and J.D. Congdon. Life history: Coluber constrictor (Black Racer) predation. Herpetological Review  23:80-81.

1993.    Scribner, K.T., J.D. Congdon, R.K. Chesser and M.H. Smith. Annual difference in female reproductive success affect spatial and cohort-specific genotypic heterogeneity in painted turtles (Chrysemys picta). Evolution  47:1360-1373.

1993.    Burke, V.J., M. Ostentoski, R.D. Nagle and J.D. Congdon. Common snapping turtles associated with ant mounds. Journal of Herpetology  27:114-115.

1993.    Tinkle, D.W., A.E. Dunham and J.D. Congdon. Life history and demographic variation in Sceloporus graciosus: a long-term study. Ecology  74:2413-2429. 

1993.     Congdon, J.D., A.E. Dunham and R.C. van Loben Sels. Delayed sexual maturity and demographics of Blanding's turtles: implications for conservation and management of long-lived organisms. Journal of Conservation Biology  7:826-833.

1993.    Avery, H.W., J.R. Spotila, J.D. Congdon, R.U. Fischer, E.A. Standora and S.B. Avery. Roles of diet protein and temperature in the growth and nutritional energetics of juvenile slider turtles, Trachemys scripta.  Physiological Zoology  66:902-925.

1994.    Fischer, R.U., D.E. Scott,  J.D. Congdon and S.A. Busa. Mass dynamics during embryonic development and parental investment in cottonmouth neonates. Journal of Herpetology  28:364- 369.

1994.    Smith, K.T., R.E. Ballinger and J.D. Congdon. Thermal ecology of a montane lizard, Sceloporus scalaris. Canadian Journal of Zoology 71:2152-2155.

1994.    Plummer, M.V. and J.D. Congdon. Radiotelemetric study of activity and movement of racers (Coluber constrictor) associated with a Carolina Bay in South Caroli