Blake Hossack, Ph.D.
Biography
Ph.D. Fish and Wildlife Biology. 2011. University of Montana, Missoula
M.S. Wildlife Biology. 1998. University of Idaho, Moscow
B.S. Wildlife Biology. 1996. University of Montana, Missoula
Blake Hossack's research is focused on measuring population and community responses to climate change, energy development, invasive species, and wetland mitigation and management. Most of his research is focused on wetlands and amphibians, with long-term research areas in the Crown of the Continent Ecosystem (Montana), Greater Yellowstone Ecosystem (Wyoming), southern Arizona and Mexico, the northern Great Plains, and the subarctic (Manitoba). To improve conservation success, Blake has increasingly sought to integrate research into management applications. He is stationed at the University of Montana in Missoula, Montana, where he coordinates activities for the Amphibian Research and Monitoring Initiative (ARMI).
Current Research Projects:
- Long-term research on amphibians and wetlands in the Desert Southwest, Greater Yellowstone Ecosystem, and Crown of the Continent Ecosystem
- Effects of disease on imperiled amphibian populations
- Designing citizen science programs for research on effects of climate change on wetland communities in the Canadian Subarctic
- Measurement of the threat of climate to aquatic species, their capacity for local adaptation, and adaptive management to reduce threats.
- Integrating metapopulation ecology and landscape ecology for improved population viability analysis and conservation decision-making.
- Quantifying the ecological value of mitigation and other constructed wetlands
- Informing recovery of threatened and endangered amphibians in the US-Mexico Borderlands
- Effects of energy development on wetland communities in the Prairie Pothole Region
- Using environmental DNA (eDNA) to detect and monitor pathogens and rare herpetofauna
- Documenting responses of aquatic communities to installation of beaver dam analog structures in headwater streams in prairie and sagebrush lands
Science and Products
Western Waters Invasive Species and Disease Research Program
Researchers at the Northern Rocky Mountain Science Center's Western Waters Invasive Species and Disease Research Program work extensively with federal, state, tribal, regional, and local partners to deliver science to improve early detection and prevention of invasive species and disease; understand complex interactions that promote invasive species and disease, and their impacts (and...
Modeling Colonization of a Population of Chiricahua Leopard Frogs
Managing a species with intensive tools like reintroduction may focus on single sites or entire landscapes. For mobile species like the federally-threatened Chiricahua leopard frog (Lithobates chiricahuensis [CLF]), both suitable colonization sites and suitable dispersal corridors between sites are needed. Following the eradication of the invasive American bullfrog (Lithobates catesbeianus)...
Amphibian Chytrid Fungus Sampling in Arizona and Mexico
Information on disease presence can be of use to natural resource managers, especially in areas supporting threatened and endangered species that occur coincidentally with species that are suspected vectors for disease. A general sense of pathogen presence (or absence) can inform management directed at threatened and endangered species, especially in regions where disease is suspected to have...
Amphibian Research and Monitoring Initiative: Rocky Mountain Region
The Rocky Mountain Region of Amphibian Research and Monitoring Initiative (ARMI) encompasses Montana, Wyoming, Colorado, and New Mexico. Two USGS Science Centers initiate and develop ARMI projects in this region. Investigations at NOROCK are headed by Dr. Blake Hossack. Investigations at the Fort Collins Science Center (FORT), Colorado, are headed by Dr. Erin Muths. The ARMI program is based...
RARMI: Northern Rocky Mountain Science Center (NOROCK) Apex Sites
In contrast to RARMI study areas in Colorado that have 10 or more years of records of continuous population monitoring, there are fewer long-term datasets for amphibian populations in the northern Rocky Mountains. The exception is an ongoing study of Columbia spotted frogs at Lodge Creek, Yellowstone National Park. Three other long-term research and monitoring areas have been established in...
Elucidating mechanisms underlying amphibian declines in North America using hierarchical spatial models
Amphibian populations are declining globally at unprecedented rates but statistically rigorous identification of mechanisms is lacking. Identification of reasons underlying large-scale declines is imperative to plan and implement effective conservation efforts. Most research on amphibian population decline has focused on local populations and local factors. However, the ubiquity of declines...
Staggered-entry analysis of breeding phenology and occupancy dynamics of Arizona toads from historically occupied habitats of New Mexico, USA
For species with variable phenology, it is often challenging to produce reliable estimates of population dynamics or changes in occupancy. The Arizona Toad (Anaxyrus microscaphus) is a southwestern USA endemic that has been petitioned for legal protection, but status assessments are limited by a lack of information on population trends. Also,...
Forzley, MJ; Ryan, Mason J.; Latella, IM; Giermakowski, JT; Muths, Erin L.; Sigafus, Brent H.; Hossack, Blake R. Amphibian population responses to mitigation: Relative importance of wetland age and design
Wetland creation is a common practice to mitigate for the loss of natural wetlands. However, there is still uncertainty about how effectively created wetlands replace habitat provided by natural wetlands. This uncertainty is due in part because post-construction monitoring of biological communities, and vertebrates especially, is rare and...
Oja, Emily Bea; Swartz, Leah S; Muths, Erin L.; Hossack, Blake R. Comparative effects of energy-related saline wastewaters and sodium chloride on hatching, survival, and fitness-associated traits of two amphibian species
Salinity (sodium chloride [NaCl]) is a prevalent and persistent contaminant that negatively affects freshwater ecosystems. Although most studies focus on effects of salinity from road salts (primarily NaCl), high-salinity wastewaters from energy extraction (wastewaters) could be more harmful because they contain NaCl and other toxic components....
Tornabene, Brian J.; Breuner, Creagh; Hossack, Blake R. Corticosterone mediates a growth-survival tradeoff for an amphibian exposed to increased salinity
Life-history tradeoffs are common across taxa, but growth-survival tradeoffs—usually enhancing survival at a cost to growth—are less frequently investigated. Increased salinity (NaCl) is a prevalent anthropogenic disturbance that may cause a growth-survival tradeoff for larval amphibians. Although physiological mechanisms mediating tradeoffs are...
Tornabene, BJ; Hossack, Blake R.; Crespi, EJ; Breuner, CW Evaluating corticosterone as a biomarker for amphibians exposed to increased salinity and ambient corticosterone
Physiological biomarkers are commonly used to assess the health of taxa exposed to natural and anthropogenic stressors. Glucocorticoid (GC) hormones are often used as indicators of physiological stress in wildlife because they affect growth, reproduction and survival. Increased salinity from human activities negatively influences amphibians and...
Tornabene, Brian J.; Hossack, Blake R.; Crespi, Erica J; Breuner, Creagh W Metal accumulation varies with life history, size, and development of larval amphibians
Amphibian larvae are commonly used as indicators of aquatic ecosystem health because they are susceptible to contaminants. However, there is limited information on how species characteristics and trophic position influence contaminant loads in larval amphibians. Importantly, there remains a need to understand whether grazers (frogs and...
Smalling, Kelly; Oja, Emily Bea; Cleveland, Danielle; Davenport, Jon D; Eagles-Smith, Collin; Campbell Grant, Evan H.; Kleeman, Patrick M.; Halstead, Brian J.; Stemp, Kenzi M; Tornabene, Brian J.; Bunnell, Zachary J; Hossack, Blake R. Genomic signatures of thermal adaptation are associated with clinal shifts of life history in a broadly distributed frog
Temperature is a critical driver of ectotherm life-history strategies, whereby a warmer environment is associated with increased growth, reduced longevity and accelerated senescence. Increasing evidence indicates that thermal adaptation may underlie such life-history shifts in wild populations. Single nucleotide polymorphisms (SNPs) and copy...
Cayuela, Hugo; Dorant, Yann; Forester, Brenna R; Jeffries, Dan L; McCaffery, Rebecca; Eby, Lisa A; Hossack, Blake R.; Gippet, Jérôme M W; Pilliod, David; Funk, W Chris Enigmatic near‐extirpation in a boreal toad metapopulation in northwestern Montana
North America's protected lands harbor biodiversity and provide habitats where species threatened by a variety of stressors in other environments can thrive. Yet disease, climate change, and other threats are not limited by land management boundaries and can interact with conditions within protected landscapes to affect sensitive populations. We...
McCaffery, Rebecca; Russell, Robin E.; Hossack, Blake R. Accommodating the role of site memory in dynamic species distribution models
First-order dynamic occupancy models (FODOMs) are a class of state-space model in which the true state (occurrence) is observed imperfectly. An important assumption of FODOMs is that site dynamics only depend on the current state and that variations in dynamic processes are adequately captured with covariates or random effects. However, it is...
Direnzo, Graziella Vittoria; Miller, David A. W.; Hossack, Blake R.; Sigafus, Brent H.; Howell, Paige E.; Muths, Erin L.; Campbell Grant, Evan H. Estimating inundation of small waterbodies with sub-pixel analysis of Landsat imagery: Long-term trends in surface water area and evaluation of common drought indices
Small waterbodies are numerically dominant in many landscapes and provide several important ecosystem services, but automated measurement of waterbodies smaller than a standard Landsat pixel (0.09 ha) remains challenging. To further evaluate sub‐Landsat pixel techniques for estimating inundation extent of small waterbodies (basin area: 0.06–1...
Sall, Ibrahima; Jarchow, Christopher J.; Sigafus, Brent H.; Eby, Lisa A; Forzley, Michael James; Hossack, Blake R. Relative toxicity and sublethal effects of NaCl and energy-related saline wastewaters on prairie amphibians
Increasing salinity in freshwater environments is a growing problem due both to the negative influences of salts on ecosystems and their accumulation and persistence in environments. Two major sources of increased salinity from sodium chloride salts (NaCl) are saline wastewaters co-produced during energy production (herein, wastewaters) and road...
Tornabene, Brian J.; Breuner, Creagh W; Hossack, Blake R. Effects of experimental warming and nutrient enrichment on wetland communities at the Arctic’s edge
Global warming-related changes to freshwater ecosystems in Arctic and Subarctic regions have been magnified by nutrient input from increasing waterfowl populations. To gain insight into how these changes might affect ecosystem function, we conducted a mesocosm experiment in the Subarctic by enriching N and P (1 ×, 10 ×, and 20 × treatments) and...
Davenport, Jon M.; Fishback, LeeAnn; Hossack, Blake R.
Genetic Signatures of Thermal Adaptation are Associated with Changes in Life History in a Broadly Distributed Frog
Temperature is a critical driver of Columbia spotted frog (Rana luteiventris) life history strategies.
Enigmatic Extinction in a Boreal Toad Population in Northwestern Montana
The amphibian chytrid fungus Batrachochytrium dendrobatidis has been implicated in boreal toad declines, although its overall effect on population dynamics is complicated by interactions with changing habitat conditions, population isolation, and other environmental stressors.
A Unified Research Strategy for Disease Management
As wildlife diseases increase globally, an understanding of host-pathogen relationships can elucidate avenues for management and improve conservation efficacy. Amphibians are among the most threatened groups of wildlife, and disease is a major factor in global amphibian declines.
Large-scale Review of Amphibian Species and Community Response to Climate Change
Amphibian species and community richness has been declining in North America and climate change may play a role in these declines. Global climate change has led to a range shift of many wildlife species and thus understanding how these changes in species distribution can be used to predict amphibian community responses that may improve conservation efforts.