Tonie Rocke
Tonie Rocke is a Research Epidemiologist at the National Wildlife Health Center.
Science and Products
Filter Total Items: 13
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Filter Total Items: 133
Pleurochrysis pseudoroscoffensis (Prymnesiophyceae) blooms on the surface of the Salton Sea, California
Dense populations of the coccolithophore Pleurochrysis pseudoroscoffensis were found in surface films at several locations around the Salton Sea in February-August, 1999. An unidentified coccolithophorid was also found in low densities in earlier studies of the lake (1955-1956). To our knowledge, this is the first record of this widespread marine species in any lake. Samples taken from surface fil
Authors
K.M. Reifel, M. P. McCoy, M. A. Tiffany, T.E. Rocke, C.C. Trees, S.B. Barlow, D. J. Faulkner, S. H. Hurlbert
Pleurochrysis pseudoroscoffensis (Prymnesiophyceae) blooms on the surface of the Salton Sea, California
Dense populations of the coccolithophore Pleurochrysis pseudoroscoffensis were found in surface films at several locations around the Salton Sea in February–August, 1999. An unidentified coccolithophorid was also found in low densities in earlier studies of the lake (1955–1956). To our knowledge, this is the first record of this widespread marine species in any lake. Samples taken from surface fil
Authors
Kristen M. Reifel, M. P. McCoy, M. A. Tiffany, Tonie E. Rocke, Charles Trees, S. B. Barlow, D. J. Faulkner, S. H. Hurlbert
Desert bighorn sheep mortality due to presumptive type C botulism in California
During a routine telemetry flight of the Mojave Desert (California, USA) in August 1995, mortality signals were detected from two of 12 radio-collared female desert bighorn sheep (Ovis canadensis) in the vicinity of Old Dad Peak in San Bernardino County (California). A series of field investigations determined that at least 45 bighorn sheep had died near two artificial water catchments (guzzlers),
Authors
P. K. Swift, J. D. Wehausen, H. B. Ernest, R. S. Singer, A. M. Pauli, H. Kinde, Tonie E. Rocke, V. C. Bleich
Efficacy of a type C botulism vaccine in green-winged teal
We tested the efficacy of a single dose of Botumink toxoid for protecting wild green-winged teal (Anas crecca) during botulism epizootics caused by Clostridium botulinum type C. We challenged control and immunized ducks with four different doses of type C botulinum toxin to determine the LD50 for this species and to evaluate vaccine protection. Fewer immunized ducks were affected with botulism tha
Authors
T.E. Rocke, M. D. Samuel, P. K. Swift, G.S. Yarris
Type C botulism in dairy cattle from feed contaminated with a dead cat
Four hundred twenty-seven of 441 adult Holstein dairy cattle from a 1,200-cow dairy died over a 1-week period during early spring 1998. Affected animals were from 4 late lactation pens, one of which included the bull string. Signs included weakness, recumbency, watery diarrhea, and death. Eighty animals from the 4 pens were dead approximately 8 hours after the first ill cows were noted. Affected c
Authors
F.D. Galey, R. Terra, R. Walker, J. Adaska, M.A. Etchebarne, B. Puschener, R.H. Whitlock, T.E. Rocke, D. Willoughby, E. Tor
Environmental characteristics associated with the occurrence of avian botulism in wetlands on a northern California refuge
Avian botulism is an important disease affecting many species of waterbirds in North America, but the environmental conditions that initiate outbreaks are poorly understood. To determine wetland attributes associated with outbreaks of avian botulism in waterbirds at the Sacramento National Wildlife Refuge (SNWR), California, we compared environmental characteristics between wetlands where outbreak
Authors
Tonie E. Rocke, Ned H. Euliss, Michael D. Samuel
Oil
Each year, an average of 14 million gallons of oil from more than 10,000 accidental spills flow into fresh and saltwater environments in and around the United States. Most accidental oil spills occur when oil is transported by tankers or barges, but oil is also spilled during highway, rail, and pipeline transport, and by nontransportation-related facilities, such as refinery, bulk storage, and mar
Authors
T.E. Rocke
Avian botulism
Avian botulism is a paralytic, often fatal, disease of birds that results when they ingest toxin produced by the bacterium, Clostridium botulinum. Seven distinct types of toxin designated by the letters A to G have been identified (Table 38.1). Waterfowl die-offs due to botulism are usually caused by type C toxin; sporadic die-offs among fish-eating birds, such as common loons and gulls, have been
Authors
T.E. Rocke, M. Friend
Water and sediment characteristics associated with avian botulism outbreaks in wetlands
Avian botulism kills thousands of waterbirds annually throughout North America, but management efforts to reduce its effects have been hindered because environmental conditions that promote outbreaks are poorly understood. We measured sediment and water variables in 32 pairs of wetlands with and without a current outbreak of avian botulism. Wetlands with botulism outbreaks had greater percent orga
Authors
Tonie E. Rocke, Michael D. Samuel
Science support for restoration of the Salton Sea. Recommendations of the USGS Tiger Team to the Salton Sea Science Subcommittee
No abstract available at this time
Authors
Frank S. Shipley, Douglas A. Barnum, G.F. Black, William I. Boarman, Walter G. Duffy, Michael J. Mac, David M. Miller, Tonie E. Rocke, Roy A. Schroeder, R.G. Thiery
Environmental characteristics associated with the occurrence of avian botulism in wetlands of a northern California refuge
Avian botulism is an important disease affecting many species of waterbirds in North America, but the environmental conditions that initiate outbreaks are poorly understood. To determine wetland attributes associated with outbreaks of avian botulism in waterbirds at the Sacramento National Wildlife Refuge (SNWR), California, we compared environmental characteristics between wetlands where outbreak
Authors
Tonie E. Rocke, Ned H. Euliss, Michael D. Samuel
In situ detection of the Clostridium botulinum type C1 toxin gene in wetland sediments with a nested PCR assay
A nested PCR was developed for detection of the Clostridium botulinum type C1 toxin gene in sediments collected from wetlands where avian botulism outbreaks had or had not occurred. The C1 toxin gene was detected in 16 of 18 sites, demonstrating both the ubiquitous distribution of C. botulinum type C in wetland sediments and the sensitivity of the detection assay.
Authors
Judy L. Williamson, Tonie E. Rocke, Judd M. Aiken
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 133
Pleurochrysis pseudoroscoffensis (Prymnesiophyceae) blooms on the surface of the Salton Sea, California
Dense populations of the coccolithophore Pleurochrysis pseudoroscoffensis were found in surface films at several locations around the Salton Sea in February-August, 1999. An unidentified coccolithophorid was also found in low densities in earlier studies of the lake (1955-1956). To our knowledge, this is the first record of this widespread marine species in any lake. Samples taken from surface fil
Authors
K.M. Reifel, M. P. McCoy, M. A. Tiffany, T.E. Rocke, C.C. Trees, S.B. Barlow, D. J. Faulkner, S. H. Hurlbert
Pleurochrysis pseudoroscoffensis (Prymnesiophyceae) blooms on the surface of the Salton Sea, California
Dense populations of the coccolithophore Pleurochrysis pseudoroscoffensis were found in surface films at several locations around the Salton Sea in February–August, 1999. An unidentified coccolithophorid was also found in low densities in earlier studies of the lake (1955–1956). To our knowledge, this is the first record of this widespread marine species in any lake. Samples taken from surface fil
Authors
Kristen M. Reifel, M. P. McCoy, M. A. Tiffany, Tonie E. Rocke, Charles Trees, S. B. Barlow, D. J. Faulkner, S. H. Hurlbert
Desert bighorn sheep mortality due to presumptive type C botulism in California
During a routine telemetry flight of the Mojave Desert (California, USA) in August 1995, mortality signals were detected from two of 12 radio-collared female desert bighorn sheep (Ovis canadensis) in the vicinity of Old Dad Peak in San Bernardino County (California). A series of field investigations determined that at least 45 bighorn sheep had died near two artificial water catchments (guzzlers),
Authors
P. K. Swift, J. D. Wehausen, H. B. Ernest, R. S. Singer, A. M. Pauli, H. Kinde, Tonie E. Rocke, V. C. Bleich
Efficacy of a type C botulism vaccine in green-winged teal
We tested the efficacy of a single dose of Botumink toxoid for protecting wild green-winged teal (Anas crecca) during botulism epizootics caused by Clostridium botulinum type C. We challenged control and immunized ducks with four different doses of type C botulinum toxin to determine the LD50 for this species and to evaluate vaccine protection. Fewer immunized ducks were affected with botulism tha
Authors
T.E. Rocke, M. D. Samuel, P. K. Swift, G.S. Yarris
Type C botulism in dairy cattle from feed contaminated with a dead cat
Four hundred twenty-seven of 441 adult Holstein dairy cattle from a 1,200-cow dairy died over a 1-week period during early spring 1998. Affected animals were from 4 late lactation pens, one of which included the bull string. Signs included weakness, recumbency, watery diarrhea, and death. Eighty animals from the 4 pens were dead approximately 8 hours after the first ill cows were noted. Affected c
Authors
F.D. Galey, R. Terra, R. Walker, J. Adaska, M.A. Etchebarne, B. Puschener, R.H. Whitlock, T.E. Rocke, D. Willoughby, E. Tor
Environmental characteristics associated with the occurrence of avian botulism in wetlands on a northern California refuge
Avian botulism is an important disease affecting many species of waterbirds in North America, but the environmental conditions that initiate outbreaks are poorly understood. To determine wetland attributes associated with outbreaks of avian botulism in waterbirds at the Sacramento National Wildlife Refuge (SNWR), California, we compared environmental characteristics between wetlands where outbreak
Authors
Tonie E. Rocke, Ned H. Euliss, Michael D. Samuel
Oil
Each year, an average of 14 million gallons of oil from more than 10,000 accidental spills flow into fresh and saltwater environments in and around the United States. Most accidental oil spills occur when oil is transported by tankers or barges, but oil is also spilled during highway, rail, and pipeline transport, and by nontransportation-related facilities, such as refinery, bulk storage, and mar
Authors
T.E. Rocke
Avian botulism
Avian botulism is a paralytic, often fatal, disease of birds that results when they ingest toxin produced by the bacterium, Clostridium botulinum. Seven distinct types of toxin designated by the letters A to G have been identified (Table 38.1). Waterfowl die-offs due to botulism are usually caused by type C toxin; sporadic die-offs among fish-eating birds, such as common loons and gulls, have been
Authors
T.E. Rocke, M. Friend
Water and sediment characteristics associated with avian botulism outbreaks in wetlands
Avian botulism kills thousands of waterbirds annually throughout North America, but management efforts to reduce its effects have been hindered because environmental conditions that promote outbreaks are poorly understood. We measured sediment and water variables in 32 pairs of wetlands with and without a current outbreak of avian botulism. Wetlands with botulism outbreaks had greater percent orga
Authors
Tonie E. Rocke, Michael D. Samuel
Science support for restoration of the Salton Sea. Recommendations of the USGS Tiger Team to the Salton Sea Science Subcommittee
No abstract available at this time
Authors
Frank S. Shipley, Douglas A. Barnum, G.F. Black, William I. Boarman, Walter G. Duffy, Michael J. Mac, David M. Miller, Tonie E. Rocke, Roy A. Schroeder, R.G. Thiery
Environmental characteristics associated with the occurrence of avian botulism in wetlands of a northern California refuge
Avian botulism is an important disease affecting many species of waterbirds in North America, but the environmental conditions that initiate outbreaks are poorly understood. To determine wetland attributes associated with outbreaks of avian botulism in waterbirds at the Sacramento National Wildlife Refuge (SNWR), California, we compared environmental characteristics between wetlands where outbreak
Authors
Tonie E. Rocke, Ned H. Euliss, Michael D. Samuel
In situ detection of the Clostridium botulinum type C1 toxin gene in wetland sediments with a nested PCR assay
A nested PCR was developed for detection of the Clostridium botulinum type C1 toxin gene in sediments collected from wetlands where avian botulism outbreaks had or had not occurred. The C1 toxin gene was detected in 16 of 18 sites, demonstrating both the ubiquitous distribution of C. botulinum type C in wetland sediments and the sensitivity of the detection assay.
Authors
Judy L. Williamson, Tonie E. Rocke, Judd M. Aiken