Donald Tillitt, PhD (Former Employee)
Science and Products
Filter Total Items: 215
USGS Environmental health science strategy: providing environmental health science for a changing world: Public review release USGS Environmental health science strategy: providing environmental health science for a changing world: Public review release
America has an abundance of natural resources. We have bountiful clean water, fertile soil, and unrivaled national parks, wildlife refuges, and public lands. These resources enrich our lives and preserve our health and wellbeing. These resources have been maintained because of our history of respect for their value and an enduring commitment to their vigilant protection. Awareness of the...
Authors
Patricia R. Bright, Herbert T. Buxton, Laurie S. Balistrieri, Larry B. Barber, Francis H. Chapelle, Paul C. Cross, David P. Krabbenhoft, Geoffrey S. Plumlee, Jonathan M. Sleeman, Donald E. Tillitt, Patricia L. Toccalino, James R. Winton
Characterization of plasma vitellogenin and sex hormone concentrations during the annual reproductive cycle of the endangered razorback sucker Characterization of plasma vitellogenin and sex hormone concentrations during the annual reproductive cycle of the endangered razorback sucker
Population declines of the endangered razorback sucker Xyrauchen texanus in the Colorado River basin have been attributed to predation by and competition with nonnative fishes, habitat alteration, and dam construction. The reproductive health and seasonal variation of the reproductive end points of razorback sucker populations are currently unknown. Using nonlethal methods, we...
Authors
Jo Ellen Hinck, Diana M. Papoulias, Mandy L. Annis, Donald E. Tillitt, Carrie Marr, Nancy D. Denslow, Kevin J. Kroll, Jason Nachtmann
Gene expression changes in female zebrafish (Danio rerio) brain in response to acute exposure to methylmercury Gene expression changes in female zebrafish (Danio rerio) brain in response to acute exposure to methylmercury
Methylmercury (MeHg) is a potent neurotoxicant and endocrine disruptor that accumulates in aquatic systems. Previous studies have shown suppression of hormone levels in both male and female fish, suggesting effects on gonadotropin regulation in the brain. The gene expression profile in adult female zebrafish whole brain induced by acute (96 h) MeHg exposure was investigated. Fish were...
Authors
Catherine A. Richter, Natàlia Garcia-Reyero, Chris Martyniuk, Iris Knoebl, Marie Pope, Maureen K. Wright-Osment, Nancy D. Denslow, Donald E. Tillitt
Characterization of environmental cues for initiation of reproductive cycling and spawning in shovelnose sturgeon Scaphirhynchus platorynchus in the Lower Missouri River, USA Characterization of environmental cues for initiation of reproductive cycling and spawning in shovelnose sturgeon Scaphirhynchus platorynchus in the Lower Missouri River, USA
We presume that the shovelnose sturgeon (Scaphirhynchus platorynchus) has evolved to spawn in the springtime when environmental conditions are at some optimum, but this state has not yet been defined. In this study physiological readiness to spawn in shovelnose sturgeon was examined to define more closely when spawning could occur and thus identify and evaluate prevailing environmental...
Authors
D. M. Papoulias, A. J. DeLonay, M.L. Annis, M. L. Wildhaber, D. E. Tillitt
Agricultural sources of contaminants of emerging concern and adverse health effects on freshwater fish Agricultural sources of contaminants of emerging concern and adverse health effects on freshwater fish
Agricultural contaminants of emerging concern (CECs) are generally thought of as certain classes of chemicals associated with animal feeding and production facilities. Veterinary pharmaceuticals used in animal food production systems represent one of the largest groups of CECs. In our review, we discuss the extensive increase in use of antibiotics in animal feeding operations (AFOs)...
Authors
Donald E. Tillitt, Herbert T. Buxton
Thiamine concentrations in lake whitefish eggs from the upper Great Lakes are related to maternal diet Thiamine concentrations in lake whitefish eggs from the upper Great Lakes are related to maternal diet
Thiamine deficiency is responsible for reproductive impairment in several species of salmonines in the Great lakes, and is thought to be caused by the consumption of prey containing thiaminase, a thiamine-degrading enzyme. Because thiaminase levels are extremely high in dreissenid mussels, fish that prey on them may be susceptible to thiamine deficiency. We determined thiamine...
Authors
Stephen Riley, J. Rinchard, M.P. Ebener, Donald E. Tillitt, K.R. Munkittrick, J.L. Parrott, J.D. Allen
Science and Products
Filter Total Items: 215
USGS Environmental health science strategy: providing environmental health science for a changing world: Public review release USGS Environmental health science strategy: providing environmental health science for a changing world: Public review release
America has an abundance of natural resources. We have bountiful clean water, fertile soil, and unrivaled national parks, wildlife refuges, and public lands. These resources enrich our lives and preserve our health and wellbeing. These resources have been maintained because of our history of respect for their value and an enduring commitment to their vigilant protection. Awareness of the...
Authors
Patricia R. Bright, Herbert T. Buxton, Laurie S. Balistrieri, Larry B. Barber, Francis H. Chapelle, Paul C. Cross, David P. Krabbenhoft, Geoffrey S. Plumlee, Jonathan M. Sleeman, Donald E. Tillitt, Patricia L. Toccalino, James R. Winton
Characterization of plasma vitellogenin and sex hormone concentrations during the annual reproductive cycle of the endangered razorback sucker Characterization of plasma vitellogenin and sex hormone concentrations during the annual reproductive cycle of the endangered razorback sucker
Population declines of the endangered razorback sucker Xyrauchen texanus in the Colorado River basin have been attributed to predation by and competition with nonnative fishes, habitat alteration, and dam construction. The reproductive health and seasonal variation of the reproductive end points of razorback sucker populations are currently unknown. Using nonlethal methods, we...
Authors
Jo Ellen Hinck, Diana M. Papoulias, Mandy L. Annis, Donald E. Tillitt, Carrie Marr, Nancy D. Denslow, Kevin J. Kroll, Jason Nachtmann
Gene expression changes in female zebrafish (Danio rerio) brain in response to acute exposure to methylmercury Gene expression changes in female zebrafish (Danio rerio) brain in response to acute exposure to methylmercury
Methylmercury (MeHg) is a potent neurotoxicant and endocrine disruptor that accumulates in aquatic systems. Previous studies have shown suppression of hormone levels in both male and female fish, suggesting effects on gonadotropin regulation in the brain. The gene expression profile in adult female zebrafish whole brain induced by acute (96 h) MeHg exposure was investigated. Fish were...
Authors
Catherine A. Richter, Natàlia Garcia-Reyero, Chris Martyniuk, Iris Knoebl, Marie Pope, Maureen K. Wright-Osment, Nancy D. Denslow, Donald E. Tillitt
Characterization of environmental cues for initiation of reproductive cycling and spawning in shovelnose sturgeon Scaphirhynchus platorynchus in the Lower Missouri River, USA Characterization of environmental cues for initiation of reproductive cycling and spawning in shovelnose sturgeon Scaphirhynchus platorynchus in the Lower Missouri River, USA
We presume that the shovelnose sturgeon (Scaphirhynchus platorynchus) has evolved to spawn in the springtime when environmental conditions are at some optimum, but this state has not yet been defined. In this study physiological readiness to spawn in shovelnose sturgeon was examined to define more closely when spawning could occur and thus identify and evaluate prevailing environmental...
Authors
D. M. Papoulias, A. J. DeLonay, M.L. Annis, M. L. Wildhaber, D. E. Tillitt
Agricultural sources of contaminants of emerging concern and adverse health effects on freshwater fish Agricultural sources of contaminants of emerging concern and adverse health effects on freshwater fish
Agricultural contaminants of emerging concern (CECs) are generally thought of as certain classes of chemicals associated with animal feeding and production facilities. Veterinary pharmaceuticals used in animal food production systems represent one of the largest groups of CECs. In our review, we discuss the extensive increase in use of antibiotics in animal feeding operations (AFOs)...
Authors
Donald E. Tillitt, Herbert T. Buxton
Thiamine concentrations in lake whitefish eggs from the upper Great Lakes are related to maternal diet Thiamine concentrations in lake whitefish eggs from the upper Great Lakes are related to maternal diet
Thiamine deficiency is responsible for reproductive impairment in several species of salmonines in the Great lakes, and is thought to be caused by the consumption of prey containing thiaminase, a thiamine-degrading enzyme. Because thiaminase levels are extremely high in dreissenid mussels, fish that prey on them may be susceptible to thiamine deficiency. We determined thiamine...
Authors
Stephen Riley, J. Rinchard, M.P. Ebener, Donald E. Tillitt, K.R. Munkittrick, J.L. Parrott, J.D. Allen
*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