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
Effects of rearing treatment on the behavior of captive whooping cranes (Grus americana) Effects of rearing treatment on the behavior of captive whooping cranes (Grus americana)
Small founder populations of whooping cranes are managed to maximize egg production for the purpose of reintroducing young to the wild. This results in an excessive number of hatched chicks that cannot be naturally reared by parents. Hand-rearing techniques have been developed to raise the additional hatches. However, hand rearing may affect the behavior of the birds and their chances of
Authors
M.D. Kreger, I. Estevez, Jeff S. Hatfield, G.F. Gee
Houston toad (Bufo houstonensis) in Bastrop County, Texas: need for protecting multiple subpopulations Houston toad (Bufo houstonensis) in Bastrop County, Texas: need for protecting multiple subpopulations
No abstract available.
Authors
Jeff S. Hatfield, A.H. Price, D.D. Diamond, C.D. TRUE
Golden-cheeked Warbler (Dendroica chrysoparia) in Central Texas: importance of dispersal toward persistence in a metapopulation Golden-cheeked Warbler (Dendroica chrysoparia) in Central Texas: importance of dispersal toward persistence in a metapopulation
No abstract available.
Authors
M.W. Alldredge, Jeff S. Hatfield, D.D. Diamond, C.D. TRUE
Species Conservation and Management: Case Studies Species Conservation and Management: Case Studies
This edited volume is a collection of population and metapopulation models for a wide variety of species, including plants, invertebrates, fishes, amphibians, reptiles, birds, and mammals. Each chapter of the book describes the application of RAMAS GIS 4.0 to one species, with the aim of demonstrating how various life history characteristics of the species are incorporated into the model...
Authors
H.R. Akcakaya, M.A. Burgman, O. Kindvall, C.C. Wood, P. Sjogren-Gulve, Jeff S. Hatfield, M.A. McCarthy
Normality of raw data in general linear models: The most widespread myth in statistics Normality of raw data in general linear models: The most widespread myth in statistics
In years of statistical consulting for ecologists and wildlife biologists, by far the most common misconception we have come across has been the one about normality in general linear models. These comprise a very large part of the statistical models used in ecology and include t tests, simple and multiple linear regression, polynomial regression, and analysis of variance (ANOVA) and...
Authors
Marc Kery, Jeff S. Hatfield
Demographic analysis from summaries of an age-structured population Demographic analysis from summaries of an age-structured population
Demographic analyses of age-structured populations typically rely on life history data for individuals, or when individual animals are not identified, on information about the numbers of individuals in each age class through time. While it is usually difficult to determine the age class of a randomly encountered individual, it is often the case that the individual can be readily and...
Authors
William A. Link, J. Andrew Royle, Jeff S. Hatfield
Temporal variation in bird counts within a Hawaiian rainforest Temporal variation in bird counts within a Hawaiian rainforest
We studied monthly and annual variation in density estimates of nine forest bird species along an elevational gradient in an east Maui rainforest. We conducted monthly variable circular-plot counts for 36 consecutive months along transects running downhill from timberline. Density estimates were compared by month, year, and station for all resident bird species with sizeable populations
Authors
John C. Simon, T.K. Pratt, Kim E. Berlin, James R. Kowalsky, S.G. Fancy, Jeff S. Hatfield
Behavioral effects of environmental enrichment on harbor seals (Phoca vitulina concolor) and gray seals (Halichoerus grypus) Behavioral effects of environmental enrichment on harbor seals (Phoca vitulina concolor) and gray seals (Halichoerus grypus)
Zoos and aquariums have been incorporating environmental enrichment into their animal care programs for the past 30 years to increase mental stimulation and promote natural behaviors. However, most attempts to document the effects of enrichment on animal behavior have focused on terrestrial mammals. Staff at the National Aquarium in Baltimore conducted an investigation of the behavioral...
Authors
S. A. Hunter, M. S. Bay, M. L. Martin, Jeffrey S. Hatfield
`Akohekohe response to flower availability: seasonal abundance, foraging, breeding, and molt `Akohekohe response to flower availability: seasonal abundance, foraging, breeding, and molt
We studied the relationship of flower availability to the seasonality of life history events of the `Akohekohe (Palmeria dolei), a primarily nectarivorous and endangered Hawaiian honeycreeper from montane rain forests on Maui, Hawai`i. For comparison, we also investigated temporal bird density and foraging behavior of three other competing Hawaiian honeycreepers: `Apapane (Himatione...
Authors
Kim E. Berlin, John C. Simon, T.K. Pratt, James R. Kowalsky, Jeff S. Hatfield
Water conditioning and whooping crane survival after release in Florida Water conditioning and whooping crane survival after release in Florida
About 50% of the whooping cranes (Grus americana) released in Florida die within the first year of release. Most of these deaths and those in subsequent years result from bobcat (Lynx rufus) predation. Choosing release sites in open marshes away from bobcat habitat has improved survival. We hypothesized that exposure to ponds (water conditioning) at the rearing site would encourage birds...
Authors
G.F. Gee, Jane M. Nicolich, S.A. Nesbitt, Jeff S. Hatfield, D. H. Ellis, Glenn H. Olsen
Failure of tetracycline as a biomarker in batch-marking juvenile frogs Failure of tetracycline as a biomarker in batch-marking juvenile frogs
Recent widespread amphibian declines call for better techniques to assess population dynamics. Tetracycline as a biomarker in capture-recapture studies is one technique used successfully in fish, reptiles, and mammals. A two-phase experimental study was conducted to evaluate tetracycline as a biomarker in green frogs (Rana clamitans) and pickerel frogs (Rana palustris). In the first...
Authors
Jeffrey S. Hatfield, Paula F.P. Henry, Glenn H. Olsen, M.M. Paul, Richard S. Hammerschlag
Organochlorine contaminant exposure and reproductive success of Black-Crowned Night Herons (Nycticorax nycticorax) nesting in Baltimore Harbor, Maryland Organochlorine contaminant exposure and reproductive success of Black-Crowned Night Herons (Nycticorax nycticorax) nesting in Baltimore Harbor, Maryland
The declining size of the Baltimore Harbor black-crowned night-heron (Nycticorax nycticorax) colony has been hypothesized to be linked to polychlorinated biphenyl (PCB) exposure. In 1998, a “sample egg” was collected from 65 black-crowned night-heron nests (each containing ≥ three eggs) for contaminant analysis, and the remaining eggs in these 65 nests, plus four two-egg nests, were...
Authors
Barnett A. Rattner, P. C. McGowan, Jeff S. Hatfield, Chia-Swee Hong, S. G. Chu
Science and Products
Filter Total Items: 54
Effects of rearing treatment on the behavior of captive whooping cranes (Grus americana) Effects of rearing treatment on the behavior of captive whooping cranes (Grus americana)
Small founder populations of whooping cranes are managed to maximize egg production for the purpose of reintroducing young to the wild. This results in an excessive number of hatched chicks that cannot be naturally reared by parents. Hand-rearing techniques have been developed to raise the additional hatches. However, hand rearing may affect the behavior of the birds and their chances of
Authors
M.D. Kreger, I. Estevez, Jeff S. Hatfield, G.F. Gee
Houston toad (Bufo houstonensis) in Bastrop County, Texas: need for protecting multiple subpopulations Houston toad (Bufo houstonensis) in Bastrop County, Texas: need for protecting multiple subpopulations
No abstract available.
Authors
Jeff S. Hatfield, A.H. Price, D.D. Diamond, C.D. TRUE
Golden-cheeked Warbler (Dendroica chrysoparia) in Central Texas: importance of dispersal toward persistence in a metapopulation Golden-cheeked Warbler (Dendroica chrysoparia) in Central Texas: importance of dispersal toward persistence in a metapopulation
No abstract available.
Authors
M.W. Alldredge, Jeff S. Hatfield, D.D. Diamond, C.D. TRUE
Species Conservation and Management: Case Studies Species Conservation and Management: Case Studies
This edited volume is a collection of population and metapopulation models for a wide variety of species, including plants, invertebrates, fishes, amphibians, reptiles, birds, and mammals. Each chapter of the book describes the application of RAMAS GIS 4.0 to one species, with the aim of demonstrating how various life history characteristics of the species are incorporated into the model...
Authors
H.R. Akcakaya, M.A. Burgman, O. Kindvall, C.C. Wood, P. Sjogren-Gulve, Jeff S. Hatfield, M.A. McCarthy
Normality of raw data in general linear models: The most widespread myth in statistics Normality of raw data in general linear models: The most widespread myth in statistics
In years of statistical consulting for ecologists and wildlife biologists, by far the most common misconception we have come across has been the one about normality in general linear models. These comprise a very large part of the statistical models used in ecology and include t tests, simple and multiple linear regression, polynomial regression, and analysis of variance (ANOVA) and...
Authors
Marc Kery, Jeff S. Hatfield
Demographic analysis from summaries of an age-structured population Demographic analysis from summaries of an age-structured population
Demographic analyses of age-structured populations typically rely on life history data for individuals, or when individual animals are not identified, on information about the numbers of individuals in each age class through time. While it is usually difficult to determine the age class of a randomly encountered individual, it is often the case that the individual can be readily and...
Authors
William A. Link, J. Andrew Royle, Jeff S. Hatfield
Temporal variation in bird counts within a Hawaiian rainforest Temporal variation in bird counts within a Hawaiian rainforest
We studied monthly and annual variation in density estimates of nine forest bird species along an elevational gradient in an east Maui rainforest. We conducted monthly variable circular-plot counts for 36 consecutive months along transects running downhill from timberline. Density estimates were compared by month, year, and station for all resident bird species with sizeable populations
Authors
John C. Simon, T.K. Pratt, Kim E. Berlin, James R. Kowalsky, S.G. Fancy, Jeff S. Hatfield
Behavioral effects of environmental enrichment on harbor seals (Phoca vitulina concolor) and gray seals (Halichoerus grypus) Behavioral effects of environmental enrichment on harbor seals (Phoca vitulina concolor) and gray seals (Halichoerus grypus)
Zoos and aquariums have been incorporating environmental enrichment into their animal care programs for the past 30 years to increase mental stimulation and promote natural behaviors. However, most attempts to document the effects of enrichment on animal behavior have focused on terrestrial mammals. Staff at the National Aquarium in Baltimore conducted an investigation of the behavioral...
Authors
S. A. Hunter, M. S. Bay, M. L. Martin, Jeffrey S. Hatfield
`Akohekohe response to flower availability: seasonal abundance, foraging, breeding, and molt `Akohekohe response to flower availability: seasonal abundance, foraging, breeding, and molt
We studied the relationship of flower availability to the seasonality of life history events of the `Akohekohe (Palmeria dolei), a primarily nectarivorous and endangered Hawaiian honeycreeper from montane rain forests on Maui, Hawai`i. For comparison, we also investigated temporal bird density and foraging behavior of three other competing Hawaiian honeycreepers: `Apapane (Himatione...
Authors
Kim E. Berlin, John C. Simon, T.K. Pratt, James R. Kowalsky, Jeff S. Hatfield
Water conditioning and whooping crane survival after release in Florida Water conditioning and whooping crane survival after release in Florida
About 50% of the whooping cranes (Grus americana) released in Florida die within the first year of release. Most of these deaths and those in subsequent years result from bobcat (Lynx rufus) predation. Choosing release sites in open marshes away from bobcat habitat has improved survival. We hypothesized that exposure to ponds (water conditioning) at the rearing site would encourage birds...
Authors
G.F. Gee, Jane M. Nicolich, S.A. Nesbitt, Jeff S. Hatfield, D. H. Ellis, Glenn H. Olsen
Failure of tetracycline as a biomarker in batch-marking juvenile frogs Failure of tetracycline as a biomarker in batch-marking juvenile frogs
Recent widespread amphibian declines call for better techniques to assess population dynamics. Tetracycline as a biomarker in capture-recapture studies is one technique used successfully in fish, reptiles, and mammals. A two-phase experimental study was conducted to evaluate tetracycline as a biomarker in green frogs (Rana clamitans) and pickerel frogs (Rana palustris). In the first...
Authors
Jeffrey S. Hatfield, Paula F.P. Henry, Glenn H. Olsen, M.M. Paul, Richard S. Hammerschlag
Organochlorine contaminant exposure and reproductive success of Black-Crowned Night Herons (Nycticorax nycticorax) nesting in Baltimore Harbor, Maryland Organochlorine contaminant exposure and reproductive success of Black-Crowned Night Herons (Nycticorax nycticorax) nesting in Baltimore Harbor, Maryland
The declining size of the Baltimore Harbor black-crowned night-heron (Nycticorax nycticorax) colony has been hypothesized to be linked to polychlorinated biphenyl (PCB) exposure. In 1998, a “sample egg” was collected from 65 black-crowned night-heron nests (each containing ≥ three eggs) for contaminant analysis, and the remaining eggs in these 65 nests, plus four two-egg nests, were...
Authors
Barnett A. Rattner, P. C. McGowan, Jeff S. Hatfield, Chia-Swee Hong, S. G. Chu