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
Python Vital Rates
Researchers from USGS-FORT and WARC and University of Florida are collaborating on a long-term Burmese python research program in southern Florida to address management needs of partners and stakeholders throughout the Greater Everglades.
Satellite tracking of sea turtles using Biscayne National Park, 2009-2021
This dataset includes details of loggerhead and green turtles captured and satellite tagged between 2009 and 2021; the turtles presented here have tracking days within Biscayne National Park. A subset of turtles was captured within Biscayne National Park, whereas others were tracked to the study site, and tagged elsewhere. The dataset contains information related to satellite tracking (e.g., track
Tracking durations for marine turtles satellite tagged in Gulf of Mexico and Caribbean sites, 2008-2019
This dataset contains tracking durations for several species of sea turtles tagged with satellite tags between 2008 and 2019. It contains information on species, turtle size, capture methods, tag type, how many days each tag transmitted, whether or not the tag was still attached upon recapture, fouling 'status' of the tag, and foraging region. This dataset thus allows estimation of tracking durati
Ecology of an insular snake assemblage in coastal Maine
Wildlife populations at the peripheries of their distributions or on isolated islands often display divergent and poorly understood morphological or life-history characteristics compared to core populations. We used a capture–mark–recapture dataset collected over a 19-year period to characterize a northern, insular snake assemblage in coastal Maine. We captured 611 individual snakes of 4 species (
Authors
John D. Willson, Ethan J. Royal, Jacquelyn C. Guzy, Meredith C. Swartwout, Chelsea S. Kross
Florida Kingsnake (Lampropeltis floridana) consumes a juvenile Burmese Python (Python molurus bivitattus) in southern Florida
The Burmese python (Python molurus bivittatus) is an invasive constrictor established across southern Florida. These snakes are dietary generalists with large home ranges and broad habitat requirements and their introduction has had severe impacts on native species and ecosystems in the region. We describe the first observation of a Florida kingsnake (Lampropeltis floridana) that consumed a hatchl
Authors
Peter F. Crawford, Jose A. Torres, Jacquelyn C. Guzy, Andrea Faye Currylow, Lisa Marie McBride, Gretchen Erika Anderson, Matthew F. McCollister, Christina M. Romagosa, Amy A. Yackel Adams, Kristen Hart
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 constrictor
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
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, loggerhead
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
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). This species
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 (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 difficulty stems f
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
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 on growth
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
BackgroundSatellite 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.MethodsWe leveraged data
Authors
Kristen Hart, Jacquelyn C. Guzy, Brian J. Smith
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
- Science
Python Vital Rates
Researchers from USGS-FORT and WARC and University of Florida are collaborating on a long-term Burmese python research program in southern Florida to address management needs of partners and stakeholders throughout the Greater Everglades. - Data
Satellite tracking of sea turtles using Biscayne National Park, 2009-2021
This dataset includes details of loggerhead and green turtles captured and satellite tagged between 2009 and 2021; the turtles presented here have tracking days within Biscayne National Park. A subset of turtles was captured within Biscayne National Park, whereas others were tracked to the study site, and tagged elsewhere. The dataset contains information related to satellite tracking (e.g., trackTracking durations for marine turtles satellite tagged in Gulf of Mexico and Caribbean sites, 2008-2019
This dataset contains tracking durations for several species of sea turtles tagged with satellite tags between 2008 and 2019. It contains information on species, turtle size, capture methods, tag type, how many days each tag transmitted, whether or not the tag was still attached upon recapture, fouling 'status' of the tag, and foraging region. This dataset thus allows estimation of tracking durati - Publications
Ecology of an insular snake assemblage in coastal Maine
Wildlife populations at the peripheries of their distributions or on isolated islands often display divergent and poorly understood morphological or life-history characteristics compared to core populations. We used a capture–mark–recapture dataset collected over a 19-year period to characterize a northern, insular snake assemblage in coastal Maine. We captured 611 individual snakes of 4 species (AuthorsJohn D. Willson, Ethan J. Royal, Jacquelyn C. Guzy, Meredith C. Swartwout, Chelsea S. KrossFlorida Kingsnake (Lampropeltis floridana) consumes a juvenile Burmese Python (Python molurus bivitattus) in southern Florida
The Burmese python (Python molurus bivittatus) is an invasive constrictor established across southern Florida. These snakes are dietary generalists with large home ranges and broad habitat requirements and their introduction has had severe impacts on native species and ecosystems in the region. We describe the first observation of a Florida kingsnake (Lampropeltis floridana) that consumed a hatchlAuthorsPeter F. Crawford, Jose A. Torres, Jacquelyn C. Guzy, Andrea Faye Currylow, Lisa Marie McBride, Gretchen Erika Anderson, Matthew F. McCollister, Christina M. Romagosa, Amy A. Yackel Adams, Kristen HartTelescoping 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 constrictorAuthorsIssac Lord, Joseph Redinger, Jeremy Dixon, Kristen Hart, Jacquelyn C. Guzy, Christina M. Romagosa, Michael V. CoveSatellite 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, loggerheadAuthorsKristen Hart, Allison Benscoter, Haley M. Turner, Michael Cherkiss, Andrew Crowder, Jacquelyn C. Guzy, David Roche, Christopher R. Sasso, Glenn D. Goodwin, Derek A. BurkholderMaximum 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). This speciesAuthorsAndrea Faye Currylow, Teah Evers, Gretchen Erika Anderson, Lisa Marie McBride, Matthew McCollister, Jacquelyn C. Guzy, Christina Romagosa, Kristen Hart, Amy A. Yackel AdamsBurmese 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 difficulty stems fAuthorsJacquelyn 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 HartIncreased 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 on growthAuthorsJacquelyn C. Guzy, Brian J. Halstead, Kelly M. Halloran, Jessica A. Homyack, John D. WillsonDrivers of realized satellite tracking duration in marine turtles
BackgroundSatellite 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.MethodsWe leveraged dataAuthorsKristen Hart, Jacquelyn C. Guzy, Brian J. SmithNon-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.
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