Jeffrey Hatfield, Ph.D.
Dr. Jeff Hatfield's duties include field and statistical research on U.S. wildlife and habitats, review of study plans and manuscripts, experimental design, statistical consulting with wildlife biologists, and data analysis.
Current research consists of monitoring growth and survival of Hawaiian trees, monitoring regeneration and restoration of vegetation in Texas, monitoring herbivory in National Parks of the National Capital Region, and studies of maternal-effects and Medea genes in snails and mammals.
Recent Accomplishments
Education
- Ph.D. 1986. Biostatistics (focus: theoretical ecology & genetics). The Ohio State University, Columbus, Ohio.
- M.A.S. 1982. Applied Statistics (focus: frequentist statistics). The Ohio State University, Columbus, Ohio.
- M.S. 1981. Zoology (focus: aquatic ecology & genetics). Miami University, Oxford, Ohio.
- B.A. 1979. Zoology and Mathematics & Statistics (double major). Miami University, Oxford, Ohio.
Professional Studies/Experience
Mentorship/Outreach
Professional societies/affiliations/committees/editorial boards
Honors, awards, recognition, elected offices
Scientific/Oral Presentations, Abstracts
Science and Products
Filter Total Items: 54
Spatiotemporal variation in range-wide Golden-cheeked Warbler habitat Spatiotemporal variation in range-wide Golden-cheeked Warbler habitat
Habitat availability ultimately limits the distribution and abundance of wildlife species. Consequently, it is paramount to identify where wildlife habitat is and understand how it changes over time in order to implement large scale wildlife conservation plans. Yet, no work has quantified the degree of change in range-wide breeding habitat for the golden-cheeked warbler (Setophaga...
Authors
Adam Duarte, Jennifer Jensen, Jeffrey S. Hatfield, Floyd Weckerly
Influence of space use on fitness and the reintroduction success of the Laysan teal Influence of space use on fitness and the reintroduction success of the Laysan teal
Translocation is an important tool for wildlife conservation and biodiversity restoration, but an inefficient one because of the unpredictability of success. Predictors of success such as habitat quality of the release site and number of individuals released have been identified, but the dynamics of successful translocations remain poorly understood. In particular, little is known about...
Authors
M.H. Reynolds, Jeff S. Hatfield, L.P. Laniawe, M.S. Vekasy, J.L. Klavitter, P. Berkowitz, L.H. Crampton, J. R. Walters
Shifting foundations and metrics for golden-cheeked warbler recovery Shifting foundations and metrics for golden-cheeked warbler recovery
Using the golden-cheeked warbler (Setophaga chrysoparia) as a case study, this paper discusses what lessons can be learned from the process of the emergency listing and subsequent development of the recovery plan. Are the metrics for recovery in the current warbler plan appropriate, including population size and distribution (recovery units), migration corridors, and wintering habitat...
Authors
Jeff S. Hatfield, Floyd W. Weckerly, Adam Duarte
Population dynamics of Hawaiian seabird colonies vulnerable to sea-level rise Population dynamics of Hawaiian seabird colonies vulnerable to sea-level rise
Globally, seabirds are vulnerable to anthropogenic threats both at sea and on land. Seabirds typically nest colonially and show strong fidelity to natal colonies, and such colonies on low-lying islands may be threatened by sea-level rise. We used French Frigate Shoals, the largest atoll in the Hawaiian Archipelago, as a case study to explore the population dynamics of seabird colonies...
Authors
Jeff S. Hatfield, Michelle H. Reynolds, Nathaniel E. Seavy, Crystal M. Krause
Impacts of deer herbivory on vegetation in Rock Creek Park, 2001-2009 Impacts of deer herbivory on vegetation in Rock Creek Park, 2001-2009
Starting in 2001, vegetation data have been collected annually in 16 study modules consisting of paired (1x4 m) fenced plots and unfenced control plots located in the upland forests of Rock Creek Park, Washington, D.C. Vegetation data collected from 2001-2009 have been analyzed to determine impacts of deer herbivory on vegetation in the park. Differences between fenced plots and unfenced...
Authors
Cairn C. Kraft, Jeff S. Hatfield
Absorption and biotransformation of polybrominated diphenyl ethers DE-71 and DE-79 in chicken (Gallus gallus), mallard (Anas platyrhynchos), American kestrel (Falco sparverius) and black-crowned night-heron (Nycticorax nycticorax) eggs Absorption and biotransformation of polybrominated diphenyl ethers DE-71 and DE-79 in chicken (Gallus gallus), mallard (Anas platyrhynchos), American kestrel (Falco sparverius) and black-crowned night-heron (Nycticorax nycticorax) eggs
We recently reported that air cell administration of penta-brominated diphenyl ether (penta-BDE; DE-71) evokes biochemical and immunologic effects in chicken (Gallus gallus) embryos at very low doses, and impairs pipping (i.e., stage immediately prior to hatching) and hatching success at 1.8 ug g-1 egg (actual dose absorbed) in American kestrels (Falco sparverius). In the present study...
Authors
Moira A. McKernan, Barnett A. Rattner, Jeff S. Hatfield, Robert C. Hale, Mary Ann Ottinger
Protocol for statistical analysis of vegetation changes at Catoctin Mountain Park Protocol for statistical analysis of vegetation changes at Catoctin Mountain Park
Vegetation data collected at Catoctin Mountain Park, Maryland, in a split-panel rotation design during 2004-2009 were analyzed for differences among three regions within the park and among years. Six plots were paired with plots fenced to exclude white-tailed deer (Odocoileus virginianus), and differences between open and exclosed plots were also investigated. Repeated measures analysis...
Authors
Jeff S. Hatfield, Cairn Krafft
Trading off short-term and long-term risk: minimizing the threat of Laysan duck extinction from catastrophes and sea-level rise Trading off short-term and long-term risk: minimizing the threat of Laysan duck extinction from catastrophes and sea-level rise
Conservation of oceanic island species presents many ecological and logistical challenges. The Northwestern Hawaiian Islands (NWHI) include 300,000 km2 of ocean waters and 10 groups of sub-tropical islands and atolls of high conservation value. Designated as Papahanaumokuakea Marine National Monument, the islands provide habitat for four endangered species of terrestrial birds. Despite...
Authors
Michelle Reynolds, Conor P. McGowan, Sarah J. Converse, Brady Mattsson, Jeffrey S. Hatfield, Andrew McClung, Loyal Mehrhoff, Jeffrey R. Walters, Kim Uyehara
Tidal freshwater wetland herbivory in Anacostia Park Tidal freshwater wetland herbivory in Anacostia Park
Herbivory has played a major role in dictating vegetation abundance and species composition at Kingman Marsh in Anacostia Park, Washington, D.C., since restoration of this tidal freshwater wetland was initiated in 2000. In June 2009 an herbivory study was established to document the impacts of resident Canada goose (Branta canadensis maxima) herbivory to vegetation at Kingman Marsh...
Authors
Cairn Krafft, Jeff S. Hatfield, Richard S. Hammerschlag
Postcatastrophe population dynamics and density dependence of an endemic island duck Postcatastrophe population dynamics and density dependence of an endemic island duck
Laysan ducks (Anas laysanensis) are restricted to approximately 9 km2 in the Northwestern Hawaiian Islands, USA. To evaluate the importance of density dependence for Laysan ducks, we conducted a Bayesian analysis to estimate the parameters of a Gompertz model and the magnitude of process variation and observation error based on the fluctuations in Laysan duck abundance on Laysan Island...
Authors
N.E. Seavy, M.H. Reynolds, W.A. Link, Jeff S. Hatfield
Analysis of vegetation changes in Rock Creek Park, 1991-2007 Analysis of vegetation changes in Rock Creek Park, 1991-2007
Vegetation data collected at Rock Creek Park every 4 years during 1991-2007 were analyzed for differences among 3 regions within the park and among years. The variables measured and analyzed were percentage of twigs browsed, percentage of canopy cover, species richness of herbaceous plants, number of tree seedlings in each of 7 height classes, tree seedling stocking rate for low deer...
Authors
Jeff S. Hatfield, Cairn Krafft
Presence-nonpresence surveys of golden-cheeked warblers: detection, occupancy and survey effort Presence-nonpresence surveys of golden-cheeked warblers: detection, occupancy and survey effort
Surveys to detect the presence or absence of endangered species may not consistently cover an area, account for imperfect detection or consider that detection and species presence at sample units may change within a survey season. We evaluated a detection?nondetection survey method for the federally endangered golden-cheeked warbler (GCWA) Dendroica chrysoparia. Three study areas were...
Authors
C.A. Watson, F.W. Weckerly, Jeff S. Hatfield, C.C. Farquhar, P.S. Williamson
Science and Products
Filter Total Items: 54
Spatiotemporal variation in range-wide Golden-cheeked Warbler habitat Spatiotemporal variation in range-wide Golden-cheeked Warbler habitat
Habitat availability ultimately limits the distribution and abundance of wildlife species. Consequently, it is paramount to identify where wildlife habitat is and understand how it changes over time in order to implement large scale wildlife conservation plans. Yet, no work has quantified the degree of change in range-wide breeding habitat for the golden-cheeked warbler (Setophaga...
Authors
Adam Duarte, Jennifer Jensen, Jeffrey S. Hatfield, Floyd Weckerly
Influence of space use on fitness and the reintroduction success of the Laysan teal Influence of space use on fitness and the reintroduction success of the Laysan teal
Translocation is an important tool for wildlife conservation and biodiversity restoration, but an inefficient one because of the unpredictability of success. Predictors of success such as habitat quality of the release site and number of individuals released have been identified, but the dynamics of successful translocations remain poorly understood. In particular, little is known about...
Authors
M.H. Reynolds, Jeff S. Hatfield, L.P. Laniawe, M.S. Vekasy, J.L. Klavitter, P. Berkowitz, L.H. Crampton, J. R. Walters
Shifting foundations and metrics for golden-cheeked warbler recovery Shifting foundations and metrics for golden-cheeked warbler recovery
Using the golden-cheeked warbler (Setophaga chrysoparia) as a case study, this paper discusses what lessons can be learned from the process of the emergency listing and subsequent development of the recovery plan. Are the metrics for recovery in the current warbler plan appropriate, including population size and distribution (recovery units), migration corridors, and wintering habitat...
Authors
Jeff S. Hatfield, Floyd W. Weckerly, Adam Duarte
Population dynamics of Hawaiian seabird colonies vulnerable to sea-level rise Population dynamics of Hawaiian seabird colonies vulnerable to sea-level rise
Globally, seabirds are vulnerable to anthropogenic threats both at sea and on land. Seabirds typically nest colonially and show strong fidelity to natal colonies, and such colonies on low-lying islands may be threatened by sea-level rise. We used French Frigate Shoals, the largest atoll in the Hawaiian Archipelago, as a case study to explore the population dynamics of seabird colonies...
Authors
Jeff S. Hatfield, Michelle H. Reynolds, Nathaniel E. Seavy, Crystal M. Krause
Impacts of deer herbivory on vegetation in Rock Creek Park, 2001-2009 Impacts of deer herbivory on vegetation in Rock Creek Park, 2001-2009
Starting in 2001, vegetation data have been collected annually in 16 study modules consisting of paired (1x4 m) fenced plots and unfenced control plots located in the upland forests of Rock Creek Park, Washington, D.C. Vegetation data collected from 2001-2009 have been analyzed to determine impacts of deer herbivory on vegetation in the park. Differences between fenced plots and unfenced...
Authors
Cairn C. Kraft, Jeff S. Hatfield
Absorption and biotransformation of polybrominated diphenyl ethers DE-71 and DE-79 in chicken (Gallus gallus), mallard (Anas platyrhynchos), American kestrel (Falco sparverius) and black-crowned night-heron (Nycticorax nycticorax) eggs Absorption and biotransformation of polybrominated diphenyl ethers DE-71 and DE-79 in chicken (Gallus gallus), mallard (Anas platyrhynchos), American kestrel (Falco sparverius) and black-crowned night-heron (Nycticorax nycticorax) eggs
We recently reported that air cell administration of penta-brominated diphenyl ether (penta-BDE; DE-71) evokes biochemical and immunologic effects in chicken (Gallus gallus) embryos at very low doses, and impairs pipping (i.e., stage immediately prior to hatching) and hatching success at 1.8 ug g-1 egg (actual dose absorbed) in American kestrels (Falco sparverius). In the present study...
Authors
Moira A. McKernan, Barnett A. Rattner, Jeff S. Hatfield, Robert C. Hale, Mary Ann Ottinger
Protocol for statistical analysis of vegetation changes at Catoctin Mountain Park Protocol for statistical analysis of vegetation changes at Catoctin Mountain Park
Vegetation data collected at Catoctin Mountain Park, Maryland, in a split-panel rotation design during 2004-2009 were analyzed for differences among three regions within the park and among years. Six plots were paired with plots fenced to exclude white-tailed deer (Odocoileus virginianus), and differences between open and exclosed plots were also investigated. Repeated measures analysis...
Authors
Jeff S. Hatfield, Cairn Krafft
Trading off short-term and long-term risk: minimizing the threat of Laysan duck extinction from catastrophes and sea-level rise Trading off short-term and long-term risk: minimizing the threat of Laysan duck extinction from catastrophes and sea-level rise
Conservation of oceanic island species presents many ecological and logistical challenges. The Northwestern Hawaiian Islands (NWHI) include 300,000 km2 of ocean waters and 10 groups of sub-tropical islands and atolls of high conservation value. Designated as Papahanaumokuakea Marine National Monument, the islands provide habitat for four endangered species of terrestrial birds. Despite...
Authors
Michelle Reynolds, Conor P. McGowan, Sarah J. Converse, Brady Mattsson, Jeffrey S. Hatfield, Andrew McClung, Loyal Mehrhoff, Jeffrey R. Walters, Kim Uyehara
Tidal freshwater wetland herbivory in Anacostia Park Tidal freshwater wetland herbivory in Anacostia Park
Herbivory has played a major role in dictating vegetation abundance and species composition at Kingman Marsh in Anacostia Park, Washington, D.C., since restoration of this tidal freshwater wetland was initiated in 2000. In June 2009 an herbivory study was established to document the impacts of resident Canada goose (Branta canadensis maxima) herbivory to vegetation at Kingman Marsh...
Authors
Cairn Krafft, Jeff S. Hatfield, Richard S. Hammerschlag
Postcatastrophe population dynamics and density dependence of an endemic island duck Postcatastrophe population dynamics and density dependence of an endemic island duck
Laysan ducks (Anas laysanensis) are restricted to approximately 9 km2 in the Northwestern Hawaiian Islands, USA. To evaluate the importance of density dependence for Laysan ducks, we conducted a Bayesian analysis to estimate the parameters of a Gompertz model and the magnitude of process variation and observation error based on the fluctuations in Laysan duck abundance on Laysan Island...
Authors
N.E. Seavy, M.H. Reynolds, W.A. Link, Jeff S. Hatfield
Analysis of vegetation changes in Rock Creek Park, 1991-2007 Analysis of vegetation changes in Rock Creek Park, 1991-2007
Vegetation data collected at Rock Creek Park every 4 years during 1991-2007 were analyzed for differences among 3 regions within the park and among years. The variables measured and analyzed were percentage of twigs browsed, percentage of canopy cover, species richness of herbaceous plants, number of tree seedlings in each of 7 height classes, tree seedling stocking rate for low deer...
Authors
Jeff S. Hatfield, Cairn Krafft
Presence-nonpresence surveys of golden-cheeked warblers: detection, occupancy and survey effort Presence-nonpresence surveys of golden-cheeked warblers: detection, occupancy and survey effort
Surveys to detect the presence or absence of endangered species may not consistently cover an area, account for imperfect detection or consider that detection and species presence at sample units may change within a survey season. We evaluated a detection?nondetection survey method for the federally endangered golden-cheeked warbler (GCWA) Dendroica chrysoparia. Three study areas were...
Authors
C.A. Watson, F.W. Weckerly, Jeff S. Hatfield, C.C. Farquhar, P.S. Williamson