Kristen Hart is a research ecologist, focusing on population-level studies on the ecology of a broad array of herpetofauna and other wildlife in south Florida.
She leads several research programs and collaborates closely with other USGS, university, and National Park Service scientists. She has built a program of USGS cyclic- and reimbursable funded research; major funding has been provided from the US Fish and Wildlife Service, the US Army Corps of Engineers, the USGS Priority Ecosystem Studies Program, the USGS Coastal and Marine Geology Program, and the National Park Service. She works with rare, threatened, endangered, and invasive species of reptiles including Diamondback terrapins, loggerhead sea turtles, green sea turtles, hawksbill sea turtles, crocodilians, and Burmese pythons. She is based in Davie, FL and has field sites in both Everglades and Dry Tortugas National Parks in South Florida, Bon Secour National Wildlife Refuge (Gulf Shores, AL), and Buck Island Reef National Monument (St. Croix, U.S. Virgin Islands).
Education and Certifications
Ph.D., Ecology, Duke University, 2005
M.E.M. (Master's of Environmental Management), Coastal Environmental Management, Duke University, 1999
B.S., Boston College, Bachelor of Science, 1997
Science and Products
Python Vital Rates
USGS Coordinated Burmese Python Research Strategy for South Florida (FY21 – FY27)
Post-Hurricane Florence Sea Turtle Nesting Habitat Nest Site Selection at Cape Hatteras and Cape Lookout National Seashores
Using Scout Burmese Pythons and Detector Dogs to Protect Endangered Species in the Florida Keys
Understanding Greater Everglades Mammal Communities within and adjacent to the Arthur R. Marshall Loxahatchee National Wildlife Refuge
Fine-Scale Dive Profiles and Activity Patterns of Sea Turtles in the Gulf of Mexico
Applications of Advanced Tracking and Modeling Tools with Burmese Pythons across South Florida's Landscape
Habitat Selection of the Burmese Python in the Florida Everglades
Hotspot and Risk Analysis for Sea Turtles in the Florida Keys National Marine Sanctuary
Fine-scale Benthic Habitat Mapping
Sea Turtle Movement and Habitat Use in the Northern Gulf of Mexico
Distribution and Density of Sea Turtles in the Gulf of Mexico (GOM): Gulf of Mexico Marine Assessment Program for Protected Species (GoMMAPPS)
Stable isotope values for Dry Tortugas nesting loggerheads sampled 2013-2018
Satellite tracking of sea turtles using Biscayne National Park, 2009-2021
Diet of invasive Burmese Pythons (Python molorus bivittatus) in southern Florida, 1995-2020
Carbon and nitrogen isotopic values from three omnivorous turtles, vegetation, and potential prey resources in the Santa Fe River, Florida sampled 2019-2020
Carbon and nitrogen isotopic analysis of Diamondback terrapin tissues, vegetative, and benthic invertebrate resources within Barnegat Bay, New Jersey during 3 sampling sessions between 2011-2019
Green turtle genetics in the Gulf of Mexico, 2006-2019
Satellite tracking data for post-nesting green turtles from Northwest Florida (2002-2020)
Size distribution and reproductive data of the invasive Burmese python (Python molurus bivittatus) in the Greater Everglades Ecosystem, Florida, USA, 1995-2021
Surface time for sea turtles in the Gulf of Mexico, 2010-2019
Male sea turtle telemetry (2009-2020) reveals high overlap with anthropogenic threats in the Gulf of Mexico and Caribbean
Green turtle (Chelonia mydas) stable isotope signatures from Dry Tortugas National Park, Florida, sampled 2008-2015
Tagging date, site, turtle size, and migration and foraging behavioral data for loggerheads (Caretta caretta) nesting at three sites in the Gulf of Mexico from 2011–2019
Monitoring population-level foraging distribution of a marine migratory species from land: Strengths and weaknesses of the isotopic approach on the Northwest Atlantic loggerhead turtle aggregation
Florida Kingsnake (Lampropeltis floridana) consumes a juvenile Burmese Python (Python molurus bivitattus) in southern Florida
Survey optimization for invasive Burmese pythons informed by camera traps
Telescoping prey selection in invasive Burmese pythons spells trouble for endangered rodents
Satellite tracking reveals use of Biscayne National Park by sea turtles tagged in multiple locations
A comprehensive plan for in-water sea turtle data collection in the US Gulf of Mexico
Dietary niche of three omnivorous turtle species in a northern Florida river: Insights from stable isotope analysis
Compensatory mortality explains rodent resilience to an invasive predator
Isotopic niche of New Jersey terrapins suggests intraspecific resource partitioning, and little variability following a major hurricane
Maximum clutch size of an invasive Burmese Python (Python bivittatus) in Florida, USA
United States Gulf of Mexico waters provide important nursery habitat for Mexico’s green turtle nesting populations
Green turtle movements in the Gulf of Mexico: Tracking reveals new migration corridor and habitat use suggestive of MPA expansion
Science and Products
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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.USGS Coordinated Burmese Python Research Strategy for South Florida (FY21 – FY27)
Wetland and Aquatic Research Center and Fort Collins Science Center are coordinating a long-term, landscape-scale Burmese python research strategy for South Florida.Post-Hurricane Florence Sea Turtle Nesting Habitat Nest Site Selection at Cape Hatteras and Cape Lookout National Seashores
WARC researchers will be surveying nesting beaches in Cape Hatteras and Cape Lookout National Seashores. They will record GPS locations for all crawls, nests, and turtles encountered/captured, and will be placing satellite tags on a subset of individuals to determine habitat use and delineate inter-nesting areas used by reproductive females.Using Scout Burmese Pythons and Detector Dogs to Protect Endangered Species in the Florida Keys
WARC researchers are addressing an urgent need to identify specific habitat use of pythons on Key Largo, FL.Understanding Greater Everglades Mammal Communities within and adjacent to the Arthur R. Marshall Loxahatchee National Wildlife Refuge
WARC Researchers are using a variety of methods to assess mammal communities across the Greater Everglades.Fine-Scale Dive Profiles and Activity Patterns of Sea Turtles in the Gulf of Mexico
Researchers are developing acceleration data logger pop-off packages that can be affixed to sea turtles to collect behavioral patterns of diving, surfacing, and general activity levels.Applications of Advanced Tracking and Modeling Tools with Burmese Pythons across South Florida's Landscape
Researchers will determine movement rates and habitat-use patterns of pythons across the South Florida landscape by conducting a telemetry study tracking pythons simultaneously in several locationsHabitat Selection of the Burmese Python in the Florida Everglades
Researchers plotted locations of radio-tagged pythons to create a habitat suitability model.Hotspot and Risk Analysis for Sea Turtles in the Florida Keys National Marine Sanctuary
Researchers will collect location data that will be used to identify areas of high-use for resident sea turtles in the Florida Keys National Marine Sanctuary.Fine-scale Benthic Habitat Mapping
Both ATRIS configurations were deployed in Dry Tortugas National Park (DRTO) to fill information gaps in the spatial coverage of existing habitat maps.Sea Turtle Movement and Habitat Use in the Northern Gulf of Mexico
The Bureau of Ocean Energy Management (BOEM) uses trawling to capture and relocate live sea turtles away from dredging locations to minimize the risk of turtle entrainment. These incidental turtle captures provide a unique opportunity to fill critical data gaps for difficult to capture life-stages of marine turtles.Distribution and Density of Sea Turtles in the Gulf of Mexico (GOM): Gulf of Mexico Marine Assessment Program for Protected Species (GoMMAPPS)
The over-arching goal of GoMMAPPS is to collect broad-scale survey data for seabirds, marine mammals and sea turtles to determine distribution and abundance in the Gulf of Mexico. - Data
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Stable isotope values for Dry Tortugas nesting loggerheads sampled 2013-2018
We used a combination of stable isotope analysis of carbon and nitrogen values in nesting loggerhead sea turtle samples to describe the foraging area used by each turtle. Here we present the stable isotope values for United States Geological Survey (USGS) turtles sampled in the remote Dry Tortugas National Park, south Florida, and their assigned foraging area.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., trackDiet of invasive Burmese Pythons (Python molorus bivittatus) in southern Florida, 1995-2020
Digestive tract contents were identified to provide an account of Burmese python diet. Diet contents came from 1716 pythons collected by cooperators during 1995-2020 from public and private lands across southern Florida, primarily within the Greater Everglades Ecosystem. Burmese pythons consumed 76 species of fauna across three taxonomic classes (Aves, Mammalia, and Reptilia).Carbon and nitrogen isotopic values from three omnivorous turtles, vegetation, and potential prey resources in the Santa Fe River, Florida sampled 2019-2020
All samples were collected within a 9km stretch of the Santa Fe River in northern Florida, USA. In 2019 and 2020 we sampled claw tissue from Macrochelys suwanniensis, Chelydra serpentina, and Trachemys scripta scripta, from three different sampling locations. We collected Vegetation and potential prey tissue samples within close proximity of turtle captures from two of the three capture locations.Carbon and nitrogen isotopic analysis of Diamondback terrapin tissues, vegetative, and benthic invertebrate resources within Barnegat Bay, New Jersey during 3 sampling sessions between 2011-2019
This dataset represents stable carbon and nitrogen isotopic information from tissue samples collected from diamondback terrapins, potential prey items, and vegetation from 6 salt marsh sites (4 mainland, 2 island) within a 30 km section of southern Barnegat Bay, New Jersey, USA. Red blood cells were collected from terrapins in 2011 (mature females), and whole blood samples were collected in 2015 aGreen turtle genetics in the Gulf of Mexico, 2006-2019
Mitochondrial DNA markers have elucidated patterns of connectivity between green turtle nesting populations (rookeries) and juveniles foraging in neritic nursery habitats. However, missing rookery baseline data and haplotype sharing among populations have often impeded inferences, including ascertaining origins of Gulf of Mexico juveniles. We sequenced the mitochondrial control region and additionSatellite tracking data for post-nesting green turtles from Northwest Florida (2002-2020)
This dataset includes processed satellite tracking data collected from green turtles between July 2002 and October 2020 in the Gulf of Mexico along the west coast of Florida from the Florida Keys to the Gulf Islands National Seashore. It contains model output including from the state-space model (SSM) described in Lamont et al. (2022) and centroids associated with the 50 percent and 95 percent kerSize distribution and reproductive data of the invasive Burmese python (Python molurus bivittatus) in the Greater Everglades Ecosystem, Florida, USA, 1995-2021
This dataset contains morphometric information from Burmese pythons collected from an invasive population in southern Florida between 1995-2021. Scientists from the U.S. Geological Survey and the National Park Service curated this dataset as a repository for records of Burmese pythons found on or nearby federal lands in southern Florida, including Everglades National Park, Big Cypress National PreSurface time for sea turtles in the Gulf of Mexico, 2010-2019
This dataset contains surface dive times, defined as 0-2 m in the water column, for three species of sea turtles (Kemp's ridleys, loggerheads, and green turtles) tracked via satellite telemetry in the Gulf of Mexico during periods within 2010-2019. It contains information on turtle species, location, proportion of time in "surface" bins, region of the Gulf of Mexico, corresponding remotely-sensedMale sea turtle telemetry (2009-2020) reveals high overlap with anthropogenic threats in the Gulf of Mexico and Caribbean
This dataset contains cumulative threat data for several species of male sea turtles tagged with satellite tags between 2009 and 2020. It contains information on species, capture date, days during tracking spent in marine protected areas, shipping lanes, near the coast, near oil rigs, and within known fishing operations. This dataset thus allows estimation of threat levels from these anthropogenicGreen turtle (Chelonia mydas) stable isotope signatures from Dry Tortugas National Park, Florida, sampled 2008-2015
Stable carbon and nitrogen isotope data from green turtles sampled at Dry Tortugas National Park, FL. Dataset includes: date collected, length, tissue type, percent of isotopes, calculated values of isotopes.Tagging date, site, turtle size, and migration and foraging behavioral data for loggerheads (Caretta caretta) nesting at three sites in the Gulf of Mexico from 2011–2019
Tagging information, including migration and foraging behavioral data, for female reproductive loggerhead marine turtles (Caretta caretta) that were satellite tagged at nesting beaches at Gulf Shores (Alabama [AL]), Dry Tortugas National Park (DRTO, Florida [FL]), and Everglades National Park (ENP, FL) from 2011–2019. Variables include the tagging date, tagging site, the curved carapace length-not - Multimedia
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Monitoring population-level foraging distribution of a marine migratory species from land: Strengths and weaknesses of the isotopic approach on the Northwest Atlantic loggerhead turtle aggregation
Assessing the linkage between breeding and non-breeding areas has important implications for understanding the fundamental biology of and conserving animal species. This is a challenging task for marine species, and in sea turtles a combination of stable isotope analysis (SIA) and satellite telemetry has been increasingly used. The Northwest Atlantic (NWA) loggerhead (Caretta caretta) Regional ManAuthorsSimona A. Ceriani, Susan Murasko, David S. Addison, David Anderson, Greg Curry, Nicole A. Desjardin, Scott F. Eastman, Daniel R. Evans, Nancy Evou, Mariana M.P.B. Fuentes, Matthew H. Godfrey, Kristen Hart, Paul Hillbrand, Sarah E. Hirsch, Cody R. Mott, Katherine L. Mansfield, Kristen T. Mazzarella, Sarah V. Norris, S. Michelle Pate, Katrina F. Phillips, Kirt W. Rusenko, Brian M. Shamblin, Amber Stevenson, Kelly A. Sloan, Anton D. Tucker, Ryan C. Welsh, Paolo CasaleFlorida 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 HartSurvey optimization for invasive Burmese pythons informed by camera traps
The Burmese python (Python bivittatus) is an invasive predator responsible for broad mammal declines in South Florida, United States. Despite their large size, pythons remain cryptic and require multifaceted approaches for detection. We evaluated a novel technique by deploying camera traps at known locations of radiotagged pythons in the Florida Keys. We estimated daily detection probabilities ofAuthorsMichael V. Cove, Jeremy Dixon, Katherine King, Matthew Willson, 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. BurkholderA comprehensive plan for in-water sea turtle data collection in the US Gulf of Mexico
The Deepwater Horizon Open Ocean Trustee Implementation Group (OO TIG) released a Final Open Ocean Restoration Plan 2 in 2019, which included a project titled Developing a Gulf-wide Comprehensive Plan for In-water Sea Turtle Data Collection. This document, A Comprehensive Plan for In-water Sea Turtle Data Collection in the US Gulf of Mexico (Plan), is the culmination of that OO TIG project. This PAuthorsKristen Hart, Pamela T. Plotkin, Christopher Sasso, Blair E. WitheringtonDietary niche of three omnivorous turtle species in a northern Florida river: Insights from stable isotope analysis
Macrochelys suwanniensis (Suwannee Alligator Snapping Turtle) coexists with 2 other native large omnivorous turtle species (Chelydra serpentina [Snapping Turtle] and Trachemys scripta scripta [Yellow-bellied Slider]) in a 9-km section of the Santa Fe River in northern Florida. A major shift in dominant submersed aquatic vegetation prompted us to quantify trophic position and niche overlap among thAuthorsMathew Denton, Gerald R. Johnston, Travis M. Thomas, Hardin Waddle, Susan Walls, Kristen HartCompensatory mortality explains rodent resilience to an invasive predator
Invasive Burmese pythons (Python bivittatus) in the Everglades of Florida, United States, have drastically reduced populations of mammals, yet populations of some rodents appear unaffected by the invasion. To understand this pattern, we radio-tagged cotton rats (Sigmodon hispidus) in areas of high and low python occurrence densities (hereafter occurrence) and quantified the effects of python occurAuthorsMarina E. McCampbell, Margaret Hunter, John V. Stechly, Kaitlyn N. Leist, Kristen Hart, Robert A. McCleeryIsotopic niche of New Jersey terrapins suggests intraspecific resource partitioning, and little variability following a major hurricane
Diamondback terrapins (Malaclemys terrapin) are sexually dimorphic generalist turtles that inhabit salt marshes and estuaries along the Atlantic and Gulf coasts of the United States. On October 29th, 2012, Hurricane Sandy made landfall in New Jersey, USA, directly impacting terrapin populations inhabiting central and southern Barnegat Bay. To examine potential food web mediated impacts to the terrAuthorsMathew Denton, Kristen Hart, John Wnek, Sarah A. Moss, Harold W. AveryMaximum 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 AdamsUnited States Gulf of Mexico waters provide important nursery habitat for Mexico’s green turtle nesting populations
Resolving natal populations for juvenile green turtles is challenging given their potential for extensive dispersal during the oceanic stage and ontogenetic shifts among nursery habitats. Mitochondrial DNA markers have elucidated patterns of connectivity between green turtle nesting populations (rookeries) and juvenile foraging aggregations. However, missing rookery baseline data and haplotype shaAuthorsBrian M. Shamblin, Kristen Hart, Margaret Lamont, Donna J. Shaver, Peter H. Dutton, Erin L. LaCasella, Campbell J. NairnGreen turtle movements in the Gulf of Mexico: Tracking reveals new migration corridor and habitat use suggestive of MPA expansion
Globally, Marine Protected Areas are an important tool in the conservation of large marine vertebrates. Recent studies have highlighted the use of protected areas by imperiled green turtles (Chelonia mydas) in the southern Gulf of Mexico. To identify and characterize inter-nesting, migratory, and foraging areas for green turtles that nest in the northern Gulf of Mexico, we deployed 14 satellite taAuthorsMargaret Lamont, Allison Benscoter, Kristen Hart - News