Eastern newt (Notophthalmus viridescens) in Wisconsin.
Daniel A Grear
Dan Grear is a Wildlife Disease Ecologist at the National Wildlife Health Center.
I am interested in mechanisms that cause heterogeneities in pathogen transmission in wild animal disease systems and at the interface of wildlife, domestic animal, and human health. I lead investigations into wildlife mortality events and research that incorporates field studies with theoretical modeling of disease systems to identify key mechanisms that drive transmission dynamic.
Professional Experience
2015 - Present Wildlife Disease Ecologist, U.S. Geological Survey, National Wildlife Health Center, Madison, WI
2013 - 2015 Ecologist, U.S. Department of Agriculture, Veterinary Services, Center for Epidemiology and Animal Health, Fort Collins, CO
2011 - 2014 Post-Doctoral Researcher, Colorado State University
Education and Certifications
2011 Ph.D. Ecology, Pennsylvania State University
2006 M.S. Wildlife Ecology, University of Wisconsin
2002 B.S. Wildlife Ecology, University of Wisconsin
Affiliations and Memberships*
Member of the Ecological Society of America
Member of the Wildlife Society
Bsal Task Force Working Group Member
Science and Products
Forecasting Mosquito Phenology in a Shifting Climate: Synthesizing Continental-scale Monitoring Data
Avian Influenza
Batrachochytrium salamandrivorans (Bsal) Surveillance
Batrachochytrium salamandrivorans (Bsal)
Data Release for Replicate amphibian swab and standard dilution of artificial DNA data to assess qPCR and sampling detection error for Batrachochytrium dendrobatidis.
Avian morbidity and mortality data reported to the Wildlife Health Information Sharing Partnership - event reporting system (WHISPers) in the continental United States for events beginning on or between January 1, 2023 and December 31, 2023
Serologic Survey of Selected Arthropod Borne Pathogens in Free-ranging Snowshoe Hares (Lepus americanus) Captured in Northern Michigan, USA
Mercury concentrations in amphibian tissues across the United States, 2016-2021
Paranannizziopsis spp. associated with skin lesions in wild snakes in North America and development of a real-time PCR assay for rapid detection of the fungus in clinical samples
Student Network for Amphibian Pathogen Surveillance Data (ver. 2.0, April 2024)
Population genetic analysis of the snake-infecting fungus, Ophidiomyces ophidiicola, in the eastern United States
Amphibian chytrid swab data from Mendocino County, California (2016 - 2020)
Amphibian Chytrid Swab Data from Churchill County, Nevada (2019-2021)
Evaluating regulations and surveillance as risk-mitigation to the emerging amphibian pathogen Bsal- Data release
Data from a national survey for the amphibian chytrid fungus Batrachochytrium salamandrivorans
Pathology and bacteriology of 178 tadpoles with histologically confirmed Severe Perkinsea Infections: Data
Eastern newt (Notophthalmus viridescens) in Wisconsin.
Serologic Survey of Selected Arthropod Borne Pathogens in Free-ranging Snowshoe Hares (Lepus americanus) Captured in Northern Michigan, USA
Chytrid infections exhibit historical spread and contemporary seasonality in a declining stream-breeding frog
Paranannizziopsis spp. infections in wild snakes and a qPCR assay for detection of the fungus
Broad-scale assessment of methylmercury in adult amphibians
Mercury (Hg) is a toxic contaminant that has been mobilized and distributed worldwide and is a threat to many wildlife species. Amphibians are facing unprecedented global declines due to many threats including contaminants. While the biphasic life history of many amphibians creates a potential nexus for methylmercury (MeHg) exposure in aquatic habitats and subsequent health effects, the broad-scal
Keeping the heat on: Weighted surveillance for Chytrid fungus (Batrachochytirum dendrobatidis) in Dixie Valley toads (Anaxyrus [= Bufo] williamsi)
Epistylis spp. infestation in two species of mud turtles (Kinosternon spp.) in the American Southwest
The population genetics of the causative agent of snake fungal disease indicate recent introductions to the USA
Quarterly wildlife mortality report October 2021
Acute mortality in California tiger salamander (Ambystoma californiense) and Santa Cruz long-toed salamander (Ambystoma macrodactylum croceum) caused by Ribeiroia ondatrae (Class: Trematoda)
Highly pathogenic avian influenza virus H5N2 (Clade 2.3.4.4) challenge of mallards age appropriate to the 2015 midwestern poultry outbreak
Evaluation of regulatory action and surveillance as preventive risk-mitigation to an emerging global amphibian pathogen Batrachochytrium salamandrivorans (Bsal)
Quarterly wildlife mortality report January 2021
Non-USGS Publications**
**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
Forecasting Mosquito Phenology in a Shifting Climate: Synthesizing Continental-scale Monitoring Data
Avian Influenza
Batrachochytrium salamandrivorans (Bsal) Surveillance
Batrachochytrium salamandrivorans (Bsal)
Data Release for Replicate amphibian swab and standard dilution of artificial DNA data to assess qPCR and sampling detection error for Batrachochytrium dendrobatidis.
Avian morbidity and mortality data reported to the Wildlife Health Information Sharing Partnership - event reporting system (WHISPers) in the continental United States for events beginning on or between January 1, 2023 and December 31, 2023
Serologic Survey of Selected Arthropod Borne Pathogens in Free-ranging Snowshoe Hares (Lepus americanus) Captured in Northern Michigan, USA
Mercury concentrations in amphibian tissues across the United States, 2016-2021
Paranannizziopsis spp. associated with skin lesions in wild snakes in North America and development of a real-time PCR assay for rapid detection of the fungus in clinical samples
Student Network for Amphibian Pathogen Surveillance Data (ver. 2.0, April 2024)
Population genetic analysis of the snake-infecting fungus, Ophidiomyces ophidiicola, in the eastern United States
Amphibian chytrid swab data from Mendocino County, California (2016 - 2020)
Amphibian Chytrid Swab Data from Churchill County, Nevada (2019-2021)
Evaluating regulations and surveillance as risk-mitigation to the emerging amphibian pathogen Bsal- Data release
Data from a national survey for the amphibian chytrid fungus Batrachochytrium salamandrivorans
Pathology and bacteriology of 178 tadpoles with histologically confirmed Severe Perkinsea Infections: Data
Eastern newt (Notophthalmus viridescens) in Wisconsin.
Eastern newt (Notophthalmus viridescens) in Wisconsin.
Serologic Survey of Selected Arthropod Borne Pathogens in Free-ranging Snowshoe Hares (Lepus americanus) Captured in Northern Michigan, USA
Chytrid infections exhibit historical spread and contemporary seasonality in a declining stream-breeding frog
Paranannizziopsis spp. infections in wild snakes and a qPCR assay for detection of the fungus
Broad-scale assessment of methylmercury in adult amphibians
Mercury (Hg) is a toxic contaminant that has been mobilized and distributed worldwide and is a threat to many wildlife species. Amphibians are facing unprecedented global declines due to many threats including contaminants. While the biphasic life history of many amphibians creates a potential nexus for methylmercury (MeHg) exposure in aquatic habitats and subsequent health effects, the broad-scal
Keeping the heat on: Weighted surveillance for Chytrid fungus (Batrachochytirum dendrobatidis) in Dixie Valley toads (Anaxyrus [= Bufo] williamsi)
Epistylis spp. infestation in two species of mud turtles (Kinosternon spp.) in the American Southwest
The population genetics of the causative agent of snake fungal disease indicate recent introductions to the USA
Quarterly wildlife mortality report October 2021
Acute mortality in California tiger salamander (Ambystoma californiense) and Santa Cruz long-toed salamander (Ambystoma macrodactylum croceum) caused by Ribeiroia ondatrae (Class: Trematoda)
Highly pathogenic avian influenza virus H5N2 (Clade 2.3.4.4) challenge of mallards age appropriate to the 2015 midwestern poultry outbreak
Evaluation of regulatory action and surveillance as preventive risk-mitigation to an emerging global amphibian pathogen Batrachochytrium salamandrivorans (Bsal)
Quarterly wildlife mortality report January 2021
Non-USGS Publications**
**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.
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government