Jacquelyn Guzy, PhD
Jackie is a population ecologist focusing on management of invasive species and conservation of imperiled amphibian and reptile species in dynamic landscapes. Often her research examines semi-aquatic amphibian and reptile responses to land-use and hydrologic change along with quantification of survival, recruitment and movement behaviors.
Before joining USGS, Jackie's research focused on modeling landscape-scale variation in semi-aquatic herpetofaunal community responses to forest disturbance, including damming and clearcut harvesting.
Education and Certifications
PhD, Biology, University of Arkansas, 2019
MS, Biology, University of South Florida, 2010
BS, Biology, University of Tampa, 2005
Science and Products
Filter Total Items: 21
Telescoping prey selection in invasive Burmese pythons spells trouble for endangered rodents Telescoping prey selection in invasive Burmese pythons spells trouble for endangered rodents
The allometric scaling of predators and their prey is well established within snakes (i.e., gape-width limits maximum prey sizes). However, while some species exhibit ontogenetic shifts to larger prey as they grow, others exhibit telescoping prey selection and continue to consume small prey in addition to larger prey. The Burmese python (Python bivittatus) is a large dietary generalist...
Authors
Issac Lord, Joseph Redinger, Jeremy Dixon, Kristen Hart, Jacquelyn C. Guzy, Christina M. Romagosa, Michael V. Cove
Satellite tracking reveals use of Biscayne National Park by sea turtles tagged in multiple locations Satellite tracking reveals use of Biscayne National Park by sea turtles tagged in multiple locations
Although historical observations date back to the 1800’s, there is little information on sea turtle occupancy within Biscayne National Park (BNP). The park is located along the Florida reef tract and is dominated by the Gulfstream, which acts as a corridor for many marine animals. Here we used satellite telemetry to determine areas of use in BNP for two species of imperiled sea turtles...
Authors
Kristen Hart, Allison Benscoter, Haley M. Turner, Michael Cherkiss, Andrew Crowder, Jacquelyn C. Guzy, David Roche, Christopher R. Sasso, Glenn D. Goodwin, Derek A. Burkholder
Maximum clutch size of an invasive Burmese Python (Python bivittatus) in Florida, USA Maximum clutch size of an invasive Burmese Python (Python bivittatus) in Florida, USA
Native to southeastern Asia, the Burmese Python (Python bivittatus Kuhl 1820) is an invasive species established in southern Florida (Snow et al. 2007; Krysko et al. 2016; Krysko et al. 2019). Pythons are documented as having negative effects on the Greater Everglades Ecosystem and they have proven to be a complex problem for managers trying to control populations (Guzy et al. 2023)...
Authors
Andrea Faye Currylow, Teah Evers, Gretchen Erika Anderson, Lisa Marie McBride, Matthew McCollister, Jacquelyn C. Guzy, Christina Romagosa, Kristen Hart, Amy A. Yackel Adams
Burmese pythons in Florida: A synthesis of biology, impacts, and management tools Burmese pythons in Florida: A synthesis of biology, impacts, and management tools
Burmese pythons (Python molurus bivittatus) are native to southeastern Asia, however, there is an established invasive population inhabiting much of southern Florida throughout the Greater Everglades Ecosystem. Pythons have severely impacted native species and ecosystems in Florida and represent one of the most intractable invasive-species management issues across the globe. The...
Authors
Jacquelyn C. Guzy, Bryan G. Falk, Brian J. Smith, John David Willson, Robert Reed, Nicholas Aumen, Michael L. Avery, Ian A. Bartoszek, Earl Campbell, Michael Cherkiss, Natalie M. Claunch, Andrea Faye Currylow, Tylan Dean, Jeremy Dixon, Richard M. Engeman, Sarah Funck, Rebekah Gibble, Kodiak C. Hengstebeck, John S. Humphrey, Margaret Hunter, Jillian Josimovich, Jennifer Ketterlin Eckles, Michael Kirkland, Frank J. Mazzotti, Robert A. McCleery, Melissa A. Miller, Matthew F. McCollister, M. Rockwell Parker, Shannon E. Pittman, Michael R. Rochford, Christina Romagosa, Art Roybal, Ray W. Snow, McKayla M. Spencer, Hardin Waddle, Amy A. Yackel Adams, Kristen Hart
Increased growth rates of stream salamanders following forest harvesting Increased growth rates of stream salamanders following forest harvesting
Timber harvesting can influence headwater streams by altering stream productivity, with cascading effects on the food web and predators within, including stream salamanders. Although studies have examined shifts in salamander occupancy or abundance following timber harvest, few examine sublethal effects such as changes in growth and demography. To examine the effect of upland harvesting...
Authors
Jacquelyn C. Guzy, Brian J. Halstead, Kelly M. Halloran, Jessica A. Homyack, John D. Willson
Drivers of realized satellite tracking duration in marine turtles Drivers of realized satellite tracking duration in marine turtles
Background Satellite tags have revolutionized our understanding of marine animal movements. However, tags may stop transmitting for many reasons and little research has rigorously examined tag failure. Using a long-term, large-scale, multi-species dataset, we evaluated factors influencing tracking duration of satellite tags to inform study design for future tracking studies. Methods We...
Authors
Kristen Hart, Jacquelyn C. Guzy, Brian J. Smith
Relationships of maternal body size and morphology with egg and clutch size in the diamondback terrapin, Malaclemys terrapin (Testudines: Emydidae) Relationships of maternal body size and morphology with egg and clutch size in the diamondback terrapin, Malaclemys terrapin (Testudines: Emydidae)
Because resources are finite, female animals face trade-offs between the size and number of offspring they are able to produce during a single reproductive event. Optimal egg size (OES) theory predicts that any increase in resources allocated to reproduction should increase clutch size with minimal effects on egg size. Variations of OES predict that egg size should be optimized, although...
Authors
Maximilian M. Kern, Jacquelyn C. Guzy, Jeffrey E. Lovich, J. Whitfield Gibbons, Michael E. Dorcas
Sexual dimorphism and feeding ecology of Diamond-backed Terrapins (Malaclemys terrapin) Sexual dimorphism and feeding ecology of Diamond-backed Terrapins (Malaclemys terrapin)
Natural and sexual selection are frequently invoked as causes of sexual size dimorphism in animals. Many species of turtles, including the Diamond-backed Terrapin (Malaclemys terrapin), exhibit sexual dimorphism in body size, possibly enabling the sexes to exploit different resources and reduce intraspecific competition. Female terrapins not only have larger body sizes but also...
Authors
Elizabeth B. Underwood, Sarah Bowers, Jacquelyn C. Guzy, Jeffrey E. Lovich, Carole A. Taylor, J. Whitfield Gibbons, Michael E. Dorcas
Responses of riparian reptile communities to damming and urbanization Responses of riparian reptile communities to damming and urbanization
Various anthropogenic pressures, including habitat loss, threaten reptile populations worldwide. Riparian zones are critical habitat for many reptile species, but these habitats are also frequently modified by anthropogenic activities. Our study investigated the effects of two riparian habitat modifications-damming and urbanization-on overall and species-specific reptile occupancy...
Authors
Stephanie D. Hunt, Jacquelyn C. Guzy, Steven J. Price, Brian J. Halstead, Evan A. Eskew, Michael E. Dorcas
Non-USGS Publications**
Halloran, K.M., Guzy, J.C., Homyack, J.A., and Willson, J.D. 2021. Effects of timber harvest on survival and movement of the Ouachita dusky salamander (Desmognathus brimleyorum) in a managed forest. Ecosphere 12(4): Article e03489.
Drayer, A.N., Guzy, J. C. and Price, S.J. 2020. Factors Influencing the Occupancy and Abundance of Streamside Salamander (Ambystoma barbouri) in Kentucky Streams. Journal of Herpetology. 54(3): 299-305.
Drayer, A.N., Guzy, J.C., Caro, R., and Price, S.J. 2020. Created wetlands managed for hydroperiod provide habitat for amphibians in Western Kentucky. Wetlands Ecology and Management. 28:543-558.
Guzy, J.C., Halloran, K.M., Thornton, J.E., Homyack, J.A, and Willson, J.D. 2019. Differential responses of amphibian and reptile assemblages to size of riparian buffers within managed forests. Ecological Applications. 29(8): e01995.
Guzy, J.C., Halloran, K.M., Homyack, J.A., and Willson, J.D. 2019. Influence of riparian buffers and habitat characteristics on salamander assemblages in headwater streams within managed forests. Forest Ecology and Management 432:868-883.
Guzy, J.C., Eskew, E.A., Halstead, B.J., and Price, S.J. 2018. Influence of damming on anuran species richness in riparian areas: A test of the serial discontinuity concept. Ecology and Evolution. 2018:00:1–12.
Baecher, J.A., Vogrinc, P.N., Guzy, J.C., Kross, C.S., and Willson, J.D. 2017. Herpetofaunal communities in restored and degraded unrestored remnant tallgrass prairie wetlands in northwest Arkansas, USA. Wetlands 38(1): 157-168.
Bush, C., Guzy, J.C., Halloran, K.C., Kross, C.B., Swartwout, M.C., and Willson, J.D. 2017. Distribution and Abundance of Introduced Seal Salamanders (Desmognathus monticola) in Northwest Arkansas, USA. Copeia 104(4): 680-690.
Kern, M.M, Guzy, J.C., Lovich, J.E., Gibbons, J.W., and Dorcas, M.E. 2016. Relationships of maternal body size and morphology with egg and clutch size in the diamondback terrapin, Malaclemys terrapin (Testudines: Emydidae). Biological Journal of the Linnean Society 117(2): 295–304.
Guzy, J.C., Price, S.J., and Dorcas, M.E. 2014. Using multiple methods to assess detection probabilities of riparian-zone anurans: implications for monitoring. Wildlife Research 41(3):243-257.
Witczak, L.R, Guzy, J.C., Price, S.J., and Dorcas, M.E. 2014. Temporal and spatial variation in survivorship of diamondback terrapins (Malaclemys terrapin). Chelonian Conservation and Biology 13(2):146-151.
Baecher, J.A., Vogrinc, P.N., Guzy, J.C., Neal, J.C., and Willson, J.D. 2014. Lithobates areolatus (crawfish frog) predation. Herpetological Review 45(4):61-682.
Guzy, J.C., Price, S.J., and Dorcas, M.E. 2013. The spatial configuration of greenspace affects semi-aquatic turtle occupancy and species richness in a suburban landscape. Landscape and Urban Planning 117:46-56.
Hunt, S.D., Guzy, J.C., Price, S.J., Halstead, B. J., Eskew, E.A., and Dorcas, M.E. 2013. Response of riparian reptile communities to anthropogenic habitat alteration. Biological Conservation 157:277-284.
Price, S.J., Guzy, J.C., and Dorcas, M.E. 2013. Do golf courses ponds provide suitable habitat for wetland-dependent animals in suburban areas? An assessment of turtle abundances. Journal of Herpetology 47(2):243-250.
Kern, M.M., Nassar, A.A., Guzy, J.C., and Dorcas, M.E. 2013. Oviposition Site Selection by Spotted Salamanders (Ambystoma maculatum) in an Isolated Wetland. Journal of Herpetology 47(3):445-449.
Underwood, E.B., Bowers, S. Guzy, J.C., Lovich, J.E., Taylor, C.A., Gibbons, J.W., and Dorcas, M.E. 2013. Sexual dimorphism and feeding ecology of diamondback terrapins (Malaclemys terrapin). Herpetologica 69(4):397-404.
Guzy, J.C., McCoy, E.D., Deyle, A.C., Halstead, N., Gonzalez, S.M., and Mushinsky, H.R. 2012. Urbanization interferes with the use of amphibians as indicators of ecological integrity in wetlands. Journal of Applied Ecology 49:941-952.
Kern, M.M., Guzy, J.C., Price, S.P., Hunt, S.D., Eskew, E.A., and Dorcas, M.E. 2012. Riparian-zone amphibians and reptiles within the Broad River Basin of South Carolina. Journal of the North Carolina Academy of Sciences 128:81-87.
Guzy, J.C., Campbell, T.S., and Campbell, K.R. 2006. Effects of hydrological alterations on frog and toad populations at Morris Bridge Wellfield, Hillsborough County, Florida. Florida Scientist 69(4):276-287.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Filter Total Items: 21
Telescoping prey selection in invasive Burmese pythons spells trouble for endangered rodents Telescoping prey selection in invasive Burmese pythons spells trouble for endangered rodents
The allometric scaling of predators and their prey is well established within snakes (i.e., gape-width limits maximum prey sizes). However, while some species exhibit ontogenetic shifts to larger prey as they grow, others exhibit telescoping prey selection and continue to consume small prey in addition to larger prey. The Burmese python (Python bivittatus) is a large dietary generalist...
Authors
Issac Lord, Joseph Redinger, Jeremy Dixon, Kristen Hart, Jacquelyn C. Guzy, Christina M. Romagosa, Michael V. Cove
Satellite tracking reveals use of Biscayne National Park by sea turtles tagged in multiple locations Satellite tracking reveals use of Biscayne National Park by sea turtles tagged in multiple locations
Although historical observations date back to the 1800’s, there is little information on sea turtle occupancy within Biscayne National Park (BNP). The park is located along the Florida reef tract and is dominated by the Gulfstream, which acts as a corridor for many marine animals. Here we used satellite telemetry to determine areas of use in BNP for two species of imperiled sea turtles...
Authors
Kristen Hart, Allison Benscoter, Haley M. Turner, Michael Cherkiss, Andrew Crowder, Jacquelyn C. Guzy, David Roche, Christopher R. Sasso, Glenn D. Goodwin, Derek A. Burkholder
Maximum clutch size of an invasive Burmese Python (Python bivittatus) in Florida, USA Maximum clutch size of an invasive Burmese Python (Python bivittatus) in Florida, USA
Native to southeastern Asia, the Burmese Python (Python bivittatus Kuhl 1820) is an invasive species established in southern Florida (Snow et al. 2007; Krysko et al. 2016; Krysko et al. 2019). Pythons are documented as having negative effects on the Greater Everglades Ecosystem and they have proven to be a complex problem for managers trying to control populations (Guzy et al. 2023)...
Authors
Andrea Faye Currylow, Teah Evers, Gretchen Erika Anderson, Lisa Marie McBride, Matthew McCollister, Jacquelyn C. Guzy, Christina Romagosa, Kristen Hart, Amy A. Yackel Adams
Burmese pythons in Florida: A synthesis of biology, impacts, and management tools Burmese pythons in Florida: A synthesis of biology, impacts, and management tools
Burmese pythons (Python molurus bivittatus) are native to southeastern Asia, however, there is an established invasive population inhabiting much of southern Florida throughout the Greater Everglades Ecosystem. Pythons have severely impacted native species and ecosystems in Florida and represent one of the most intractable invasive-species management issues across the globe. The...
Authors
Jacquelyn C. Guzy, Bryan G. Falk, Brian J. Smith, John David Willson, Robert Reed, Nicholas Aumen, Michael L. Avery, Ian A. Bartoszek, Earl Campbell, Michael Cherkiss, Natalie M. Claunch, Andrea Faye Currylow, Tylan Dean, Jeremy Dixon, Richard M. Engeman, Sarah Funck, Rebekah Gibble, Kodiak C. Hengstebeck, John S. Humphrey, Margaret Hunter, Jillian Josimovich, Jennifer Ketterlin Eckles, Michael Kirkland, Frank J. Mazzotti, Robert A. McCleery, Melissa A. Miller, Matthew F. McCollister, M. Rockwell Parker, Shannon E. Pittman, Michael R. Rochford, Christina Romagosa, Art Roybal, Ray W. Snow, McKayla M. Spencer, Hardin Waddle, Amy A. Yackel Adams, Kristen Hart
Increased growth rates of stream salamanders following forest harvesting Increased growth rates of stream salamanders following forest harvesting
Timber harvesting can influence headwater streams by altering stream productivity, with cascading effects on the food web and predators within, including stream salamanders. Although studies have examined shifts in salamander occupancy or abundance following timber harvest, few examine sublethal effects such as changes in growth and demography. To examine the effect of upland harvesting...
Authors
Jacquelyn C. Guzy, Brian J. Halstead, Kelly M. Halloran, Jessica A. Homyack, John D. Willson
Drivers of realized satellite tracking duration in marine turtles Drivers of realized satellite tracking duration in marine turtles
Background Satellite tags have revolutionized our understanding of marine animal movements. However, tags may stop transmitting for many reasons and little research has rigorously examined tag failure. Using a long-term, large-scale, multi-species dataset, we evaluated factors influencing tracking duration of satellite tags to inform study design for future tracking studies. Methods We...
Authors
Kristen Hart, Jacquelyn C. Guzy, Brian J. Smith
Relationships of maternal body size and morphology with egg and clutch size in the diamondback terrapin, Malaclemys terrapin (Testudines: Emydidae) Relationships of maternal body size and morphology with egg and clutch size in the diamondback terrapin, Malaclemys terrapin (Testudines: Emydidae)
Because resources are finite, female animals face trade-offs between the size and number of offspring they are able to produce during a single reproductive event. Optimal egg size (OES) theory predicts that any increase in resources allocated to reproduction should increase clutch size with minimal effects on egg size. Variations of OES predict that egg size should be optimized, although...
Authors
Maximilian M. Kern, Jacquelyn C. Guzy, Jeffrey E. Lovich, J. Whitfield Gibbons, Michael E. Dorcas
Sexual dimorphism and feeding ecology of Diamond-backed Terrapins (Malaclemys terrapin) Sexual dimorphism and feeding ecology of Diamond-backed Terrapins (Malaclemys terrapin)
Natural and sexual selection are frequently invoked as causes of sexual size dimorphism in animals. Many species of turtles, including the Diamond-backed Terrapin (Malaclemys terrapin), exhibit sexual dimorphism in body size, possibly enabling the sexes to exploit different resources and reduce intraspecific competition. Female terrapins not only have larger body sizes but also...
Authors
Elizabeth B. Underwood, Sarah Bowers, Jacquelyn C. Guzy, Jeffrey E. Lovich, Carole A. Taylor, J. Whitfield Gibbons, Michael E. Dorcas
Responses of riparian reptile communities to damming and urbanization Responses of riparian reptile communities to damming and urbanization
Various anthropogenic pressures, including habitat loss, threaten reptile populations worldwide. Riparian zones are critical habitat for many reptile species, but these habitats are also frequently modified by anthropogenic activities. Our study investigated the effects of two riparian habitat modifications-damming and urbanization-on overall and species-specific reptile occupancy...
Authors
Stephanie D. Hunt, Jacquelyn C. Guzy, Steven J. Price, Brian J. Halstead, Evan A. Eskew, Michael E. Dorcas
Non-USGS Publications**
Halloran, K.M., Guzy, J.C., Homyack, J.A., and Willson, J.D. 2021. Effects of timber harvest on survival and movement of the Ouachita dusky salamander (Desmognathus brimleyorum) in a managed forest. Ecosphere 12(4): Article e03489.
Drayer, A.N., Guzy, J. C. and Price, S.J. 2020. Factors Influencing the Occupancy and Abundance of Streamside Salamander (Ambystoma barbouri) in Kentucky Streams. Journal of Herpetology. 54(3): 299-305.
Drayer, A.N., Guzy, J.C., Caro, R., and Price, S.J. 2020. Created wetlands managed for hydroperiod provide habitat for amphibians in Western Kentucky. Wetlands Ecology and Management. 28:543-558.
Guzy, J.C., Halloran, K.M., Thornton, J.E., Homyack, J.A, and Willson, J.D. 2019. Differential responses of amphibian and reptile assemblages to size of riparian buffers within managed forests. Ecological Applications. 29(8): e01995.
Guzy, J.C., Halloran, K.M., Homyack, J.A., and Willson, J.D. 2019. Influence of riparian buffers and habitat characteristics on salamander assemblages in headwater streams within managed forests. Forest Ecology and Management 432:868-883.
Guzy, J.C., Eskew, E.A., Halstead, B.J., and Price, S.J. 2018. Influence of damming on anuran species richness in riparian areas: A test of the serial discontinuity concept. Ecology and Evolution. 2018:00:1–12.
Baecher, J.A., Vogrinc, P.N., Guzy, J.C., Kross, C.S., and Willson, J.D. 2017. Herpetofaunal communities in restored and degraded unrestored remnant tallgrass prairie wetlands in northwest Arkansas, USA. Wetlands 38(1): 157-168.
Bush, C., Guzy, J.C., Halloran, K.C., Kross, C.B., Swartwout, M.C., and Willson, J.D. 2017. Distribution and Abundance of Introduced Seal Salamanders (Desmognathus monticola) in Northwest Arkansas, USA. Copeia 104(4): 680-690.
Kern, M.M, Guzy, J.C., Lovich, J.E., Gibbons, J.W., and Dorcas, M.E. 2016. Relationships of maternal body size and morphology with egg and clutch size in the diamondback terrapin, Malaclemys terrapin (Testudines: Emydidae). Biological Journal of the Linnean Society 117(2): 295–304.
Guzy, J.C., Price, S.J., and Dorcas, M.E. 2014. Using multiple methods to assess detection probabilities of riparian-zone anurans: implications for monitoring. Wildlife Research 41(3):243-257.
Witczak, L.R, Guzy, J.C., Price, S.J., and Dorcas, M.E. 2014. Temporal and spatial variation in survivorship of diamondback terrapins (Malaclemys terrapin). Chelonian Conservation and Biology 13(2):146-151.
Baecher, J.A., Vogrinc, P.N., Guzy, J.C., Neal, J.C., and Willson, J.D. 2014. Lithobates areolatus (crawfish frog) predation. Herpetological Review 45(4):61-682.
Guzy, J.C., Price, S.J., and Dorcas, M.E. 2013. The spatial configuration of greenspace affects semi-aquatic turtle occupancy and species richness in a suburban landscape. Landscape and Urban Planning 117:46-56.
Hunt, S.D., Guzy, J.C., Price, S.J., Halstead, B. J., Eskew, E.A., and Dorcas, M.E. 2013. Response of riparian reptile communities to anthropogenic habitat alteration. Biological Conservation 157:277-284.
Price, S.J., Guzy, J.C., and Dorcas, M.E. 2013. Do golf courses ponds provide suitable habitat for wetland-dependent animals in suburban areas? An assessment of turtle abundances. Journal of Herpetology 47(2):243-250.
Kern, M.M., Nassar, A.A., Guzy, J.C., and Dorcas, M.E. 2013. Oviposition Site Selection by Spotted Salamanders (Ambystoma maculatum) in an Isolated Wetland. Journal of Herpetology 47(3):445-449.
Underwood, E.B., Bowers, S. Guzy, J.C., Lovich, J.E., Taylor, C.A., Gibbons, J.W., and Dorcas, M.E. 2013. Sexual dimorphism and feeding ecology of diamondback terrapins (Malaclemys terrapin). Herpetologica 69(4):397-404.
Guzy, J.C., McCoy, E.D., Deyle, A.C., Halstead, N., Gonzalez, S.M., and Mushinsky, H.R. 2012. Urbanization interferes with the use of amphibians as indicators of ecological integrity in wetlands. Journal of Applied Ecology 49:941-952.
Kern, M.M., Guzy, J.C., Price, S.P., Hunt, S.D., Eskew, E.A., and Dorcas, M.E. 2012. Riparian-zone amphibians and reptiles within the Broad River Basin of South Carolina. Journal of the North Carolina Academy of Sciences 128:81-87.
Guzy, J.C., Campbell, T.S., and Campbell, K.R. 2006. Effects of hydrological alterations on frog and toad populations at Morris Bridge Wellfield, Hillsborough County, Florida. Florida Scientist 69(4):276-287.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.