Christine Densmore (Former Employee)
Science and Products
Filter Total Items: 44
Molecular detection of avian influenza virus from sediment samples in waterfowl habitats on the Delmarva Peninsula, United States Molecular detection of avian influenza virus from sediment samples in waterfowl habitats on the Delmarva Peninsula, United States
Avian influenza viruses (AIV) affect many species of birds including waterfowl and may persist in sediment in aquatic habitats. Sediment samples were collected from two areas representative of prime migration and overwintering waterfowl habitat in Dorchester County, Maryland in the fall and winter of 2013–2014. Samples were screened for the presence of AIV via reverse transcriptase...
Authors
Christine L. Densmore, Deborah D. Iwanowicz, Christopher Ottinger, Larry J. Hindman, Amanda Bessler, Luke R. Iwanowicz, Diann J. Prosser, Matt Whitbeck, Cindy P. Driscoll
U.S. Geological Survey science strategy for highly pathogenic avian influenza in wildlife and the environment (2016–2020) U.S. Geological Survey science strategy for highly pathogenic avian influenza in wildlife and the environment (2016–2020)
Introduction Through the Science Strategy for Highly Pathogenic Avian Influenza (HPAI) in Wildlife and the Environment, the USGS will assess avian influenza (AI) dynamics in an ecological context to inform decisions made by resource managers and policymakers from the local to national level. Through collection of unbiased scientific information on the ecology of AI viruses and wildlife...
Authors
M. Camille Harris, John M. Pearce, Diann J. Prosser, C. LeAnn White, A. Keith Miles, Jonathan M. Sleeman, Christopher J. Brand, James P. Cronin, Susan De La Cruz, Christine L. Densmore, Thomas W. Doyle, Robert J. Dusek, Joseph P. Fleskes, Paul L. Flint, Gerald F. Guala, Jeffrey S. Hall, Laura E. Hubbard, Randall J. Hunt, S. Ip, Rachel A. Katz, Kevin W. Laurent, Mark P. Miller, Mark D. Munn, Andrew M. Ramey, Kevin D. Richards, Robin E. Russell, Joel P. Stokdyk, John Y. Takekawa, Daniel P. Walsh
Transforming growth factor-β1 expression in endangered age-0 shortnose suckers (Chasmistes brevirostris) from Upper Klamath Lake, OR relative to histopathology, meristic, spatial, and temporal data Transforming growth factor-β1 expression in endangered age-0 shortnose suckers (Chasmistes brevirostris) from Upper Klamath Lake, OR relative to histopathology, meristic, spatial, and temporal data
During July – September of 2008, 2009, and 2010 endangered age-0 juvenile shortnose suckers were sampled from Upper Klamath Lake, OR in a health evaluation that included the measurement of transforming growth factor – beta (TGF-β) expression in spleen in combination with a histopathology assessment. This analysis was performed to determine if the expression of this immuno-regulator could...
Authors
Christopher A. Ottinger, Christine L. Densmore, Laura S. Robertson, Deborah D. Iwanowicz, Scott P. Vanderkooi
Mycobacterial infection in Northern snakehead (Channa argus) from the Potomac River catchment Mycobacterial infection in Northern snakehead (Channa argus) from the Potomac River catchment
The Northern snakehead, Channa argus (Cantor), is a non-native predatory fish that has become established regionally in some temperate freshwater habitats within the United States. Over the past decade, Northern snakehead populations have developed within aquatic ecosystems throughout the eastern USA, including the Potomac River system within Virginia, Maryland and Washington, D.C. Since...
Authors
Christine L. Densmore, Luke R. Iwanowicz, Anne Henderson, Deborah D. Iwanowicz, J.S. Odenkirk
In vitro immune functions in thiamine-replete and -depleted lake trout (Salvelinus namaycush) In vitro immune functions in thiamine-replete and -depleted lake trout (Salvelinus namaycush)
In this study we examined the impacts of in vivo thiamine deficiency on lake trout leukocyte function measured in vitro. When compared outside the context of individual-specific thiamine concentrations no significant differences were observed in leukocyte bactericidal activity or in concanavalin A (Con A), and phytohemagglutinin-P (PHA-P) stimulated leukocyte proliferation. Placing...
Authors
Christopher A. Ottinger, Dale C. Honeyfield, Christine L. Densmore, Luke R. Iwanowicz
Suppressing bullfrog larvae with carbon dioxide Suppressing bullfrog larvae with carbon dioxide
Current management strategies for the control and suppression of the American Bullfrog (Lithobates catesbeianus = Rana catesbeiana Shaw) and other invasive amphibians have had minimal effect on their abundance and distribution. This study evaluates the effects of carbon dioxide (CO2) on pre- and prometamorphic Bullfrog larvae. Bullfrogs are a model organism for evaluating potential...
Authors
Mark Abbey-Lambert, Andrew Ray, Megan J. Layhee, Christine L. Densmore, Adam Sepulveda, Jackson A. Gross, Barnaby J. Watten
Identification of largemouth bass virus in the introduced Northern snakehead inhabiting the Cheasapeake Bay watershed Identification of largemouth bass virus in the introduced Northern snakehead inhabiting the Cheasapeake Bay watershed
The Northern Snakehead Channa argus is an introduced species that now inhabits the Chesapeake Bay. During a preliminary survey for introduced pathogens possibly harbored by these fish in Virginia waters, a filterable agent was isolated from five specimens that produced cytopathic effects in BF-2 cells. Based on PCR amplification and partial sequencing of the major capsid protein (MCP)...
Authors
Luke R. Iwanowicz, Christine L. Densmore, Cassidy M. Hahn, Phillip McAllister, John Odenkirk
Effects of depletion sampling by standard three-pass pulsed DC electrofishing on blood chemistry parameters of fishes from Appalachian streams Effects of depletion sampling by standard three-pass pulsed DC electrofishing on blood chemistry parameters of fishes from Appalachian streams
Adverse effects on fishes captured by electrofishing techniques have long been recognized, although the extent of associated physical injury and behavioral alterations are highly variable and dependent on a number of factors. We examined the effects of three-pass pulsed DC (PDC) electrofishing on two salmonid species (Rainbow Trout Oncorhynchus mykiss and Brook Trout Salvelinus...
Authors
Christine L. Densmore, Frank M. Panek
Frequency and Severity of Trauma in Fishes Subjected to Multiple-pass Depletion Electrofishing Frequency and Severity of Trauma in Fishes Subjected to Multiple-pass Depletion Electrofishing
The incidence and severity of trauma associated with multiple-pass electrofishing and the effects on short-term (30-d) survival and growth of Rainbow Trout Oncorhynchus mykiss, Brook Trout Salvelinus fontinalis, and five representative co-inhabiting nontarget or bycatch species were examined. Fish were held in four rectangular fiberglass tanks (190 × 66 cm) equipped with electrodes, a...
Authors
Frank Panek, Christine L. Densmore
Impact of thiamine deficiency on T-cell dependent and T-cell independent antibody production in lake trout Impact of thiamine deficiency on T-cell dependent and T-cell independent antibody production in lake trout
Lake trout Salvelinus namaycush on thiamine-replete and thiamine-depleted diets were evaluated for the effects of thiamine status on in vivo responses to the T-dependent antigen trinitophenol (TNP)-keyhole limpet hemocyanin (TNP-KLH), the T-independent antigen trinitrophenol-lipolysaccaharide (TNP-LPS), or Dulbecco's phosphate-buffered saline (DPBS; negative control fish). Plasma...
Authors
Christopher A. Ottinger, Dale C. Honeyfield, Christine L. Densmore, Luke R. Iwanowicz
Electrofishing and the effects of depletion sampling on fish health: A review and recommendations for additional study Electrofishing and the effects of depletion sampling on fish health: A review and recommendations for additional study
Depletion sampling in combination with multiple-pass electrofishing is an important fisheries management tool for wadeable streams. This combination of techniques has been used routinely by federal and state fishery management agencies for several decades as a reliable means to obtain quantitative data on trout populations or to describe fish community structure. In this paper we review...
Authors
F. M. Panek, Christine L. Densmore
Global amphibian declines: perspectives from the United States and beyond Global amphibian declines: perspectives from the United States and beyond
Over recent decades, amphibians have experienced population declines, extirpations and species-level extinctions at an alarming rate. Numerous potential etiologies for amphibian declines have been postulated including climate and habitat degradation. Other potential anthropogenic causes including overexploitation and the frequent introductions of invasive predatory species have also been...
Authors
Christine L. Densmore
Science and Products
Filter Total Items: 44
Molecular detection of avian influenza virus from sediment samples in waterfowl habitats on the Delmarva Peninsula, United States Molecular detection of avian influenza virus from sediment samples in waterfowl habitats on the Delmarva Peninsula, United States
Avian influenza viruses (AIV) affect many species of birds including waterfowl and may persist in sediment in aquatic habitats. Sediment samples were collected from two areas representative of prime migration and overwintering waterfowl habitat in Dorchester County, Maryland in the fall and winter of 2013–2014. Samples were screened for the presence of AIV via reverse transcriptase...
Authors
Christine L. Densmore, Deborah D. Iwanowicz, Christopher Ottinger, Larry J. Hindman, Amanda Bessler, Luke R. Iwanowicz, Diann J. Prosser, Matt Whitbeck, Cindy P. Driscoll
U.S. Geological Survey science strategy for highly pathogenic avian influenza in wildlife and the environment (2016–2020) U.S. Geological Survey science strategy for highly pathogenic avian influenza in wildlife and the environment (2016–2020)
Introduction Through the Science Strategy for Highly Pathogenic Avian Influenza (HPAI) in Wildlife and the Environment, the USGS will assess avian influenza (AI) dynamics in an ecological context to inform decisions made by resource managers and policymakers from the local to national level. Through collection of unbiased scientific information on the ecology of AI viruses and wildlife...
Authors
M. Camille Harris, John M. Pearce, Diann J. Prosser, C. LeAnn White, A. Keith Miles, Jonathan M. Sleeman, Christopher J. Brand, James P. Cronin, Susan De La Cruz, Christine L. Densmore, Thomas W. Doyle, Robert J. Dusek, Joseph P. Fleskes, Paul L. Flint, Gerald F. Guala, Jeffrey S. Hall, Laura E. Hubbard, Randall J. Hunt, S. Ip, Rachel A. Katz, Kevin W. Laurent, Mark P. Miller, Mark D. Munn, Andrew M. Ramey, Kevin D. Richards, Robin E. Russell, Joel P. Stokdyk, John Y. Takekawa, Daniel P. Walsh
Transforming growth factor-β1 expression in endangered age-0 shortnose suckers (Chasmistes brevirostris) from Upper Klamath Lake, OR relative to histopathology, meristic, spatial, and temporal data Transforming growth factor-β1 expression in endangered age-0 shortnose suckers (Chasmistes brevirostris) from Upper Klamath Lake, OR relative to histopathology, meristic, spatial, and temporal data
During July – September of 2008, 2009, and 2010 endangered age-0 juvenile shortnose suckers were sampled from Upper Klamath Lake, OR in a health evaluation that included the measurement of transforming growth factor – beta (TGF-β) expression in spleen in combination with a histopathology assessment. This analysis was performed to determine if the expression of this immuno-regulator could...
Authors
Christopher A. Ottinger, Christine L. Densmore, Laura S. Robertson, Deborah D. Iwanowicz, Scott P. Vanderkooi
Mycobacterial infection in Northern snakehead (Channa argus) from the Potomac River catchment Mycobacterial infection in Northern snakehead (Channa argus) from the Potomac River catchment
The Northern snakehead, Channa argus (Cantor), is a non-native predatory fish that has become established regionally in some temperate freshwater habitats within the United States. Over the past decade, Northern snakehead populations have developed within aquatic ecosystems throughout the eastern USA, including the Potomac River system within Virginia, Maryland and Washington, D.C. Since...
Authors
Christine L. Densmore, Luke R. Iwanowicz, Anne Henderson, Deborah D. Iwanowicz, J.S. Odenkirk
In vitro immune functions in thiamine-replete and -depleted lake trout (Salvelinus namaycush) In vitro immune functions in thiamine-replete and -depleted lake trout (Salvelinus namaycush)
In this study we examined the impacts of in vivo thiamine deficiency on lake trout leukocyte function measured in vitro. When compared outside the context of individual-specific thiamine concentrations no significant differences were observed in leukocyte bactericidal activity or in concanavalin A (Con A), and phytohemagglutinin-P (PHA-P) stimulated leukocyte proliferation. Placing...
Authors
Christopher A. Ottinger, Dale C. Honeyfield, Christine L. Densmore, Luke R. Iwanowicz
Suppressing bullfrog larvae with carbon dioxide Suppressing bullfrog larvae with carbon dioxide
Current management strategies for the control and suppression of the American Bullfrog (Lithobates catesbeianus = Rana catesbeiana Shaw) and other invasive amphibians have had minimal effect on their abundance and distribution. This study evaluates the effects of carbon dioxide (CO2) on pre- and prometamorphic Bullfrog larvae. Bullfrogs are a model organism for evaluating potential...
Authors
Mark Abbey-Lambert, Andrew Ray, Megan J. Layhee, Christine L. Densmore, Adam Sepulveda, Jackson A. Gross, Barnaby J. Watten
Identification of largemouth bass virus in the introduced Northern snakehead inhabiting the Cheasapeake Bay watershed Identification of largemouth bass virus in the introduced Northern snakehead inhabiting the Cheasapeake Bay watershed
The Northern Snakehead Channa argus is an introduced species that now inhabits the Chesapeake Bay. During a preliminary survey for introduced pathogens possibly harbored by these fish in Virginia waters, a filterable agent was isolated from five specimens that produced cytopathic effects in BF-2 cells. Based on PCR amplification and partial sequencing of the major capsid protein (MCP)...
Authors
Luke R. Iwanowicz, Christine L. Densmore, Cassidy M. Hahn, Phillip McAllister, John Odenkirk
Effects of depletion sampling by standard three-pass pulsed DC electrofishing on blood chemistry parameters of fishes from Appalachian streams Effects of depletion sampling by standard three-pass pulsed DC electrofishing on blood chemistry parameters of fishes from Appalachian streams
Adverse effects on fishes captured by electrofishing techniques have long been recognized, although the extent of associated physical injury and behavioral alterations are highly variable and dependent on a number of factors. We examined the effects of three-pass pulsed DC (PDC) electrofishing on two salmonid species (Rainbow Trout Oncorhynchus mykiss and Brook Trout Salvelinus...
Authors
Christine L. Densmore, Frank M. Panek
Frequency and Severity of Trauma in Fishes Subjected to Multiple-pass Depletion Electrofishing Frequency and Severity of Trauma in Fishes Subjected to Multiple-pass Depletion Electrofishing
The incidence and severity of trauma associated with multiple-pass electrofishing and the effects on short-term (30-d) survival and growth of Rainbow Trout Oncorhynchus mykiss, Brook Trout Salvelinus fontinalis, and five representative co-inhabiting nontarget or bycatch species were examined. Fish were held in four rectangular fiberglass tanks (190 × 66 cm) equipped with electrodes, a...
Authors
Frank Panek, Christine L. Densmore
Impact of thiamine deficiency on T-cell dependent and T-cell independent antibody production in lake trout Impact of thiamine deficiency on T-cell dependent and T-cell independent antibody production in lake trout
Lake trout Salvelinus namaycush on thiamine-replete and thiamine-depleted diets were evaluated for the effects of thiamine status on in vivo responses to the T-dependent antigen trinitophenol (TNP)-keyhole limpet hemocyanin (TNP-KLH), the T-independent antigen trinitrophenol-lipolysaccaharide (TNP-LPS), or Dulbecco's phosphate-buffered saline (DPBS; negative control fish). Plasma...
Authors
Christopher A. Ottinger, Dale C. Honeyfield, Christine L. Densmore, Luke R. Iwanowicz
Electrofishing and the effects of depletion sampling on fish health: A review and recommendations for additional study Electrofishing and the effects of depletion sampling on fish health: A review and recommendations for additional study
Depletion sampling in combination with multiple-pass electrofishing is an important fisheries management tool for wadeable streams. This combination of techniques has been used routinely by federal and state fishery management agencies for several decades as a reliable means to obtain quantitative data on trout populations or to describe fish community structure. In this paper we review...
Authors
F. M. Panek, Christine L. Densmore
Global amphibian declines: perspectives from the United States and beyond Global amphibian declines: perspectives from the United States and beyond
Over recent decades, amphibians have experienced population declines, extirpations and species-level extinctions at an alarming rate. Numerous potential etiologies for amphibian declines have been postulated including climate and habitat degradation. Other potential anthropogenic causes including overexploitation and the frequent introductions of invasive predatory species have also been...
Authors
Christine L. Densmore
*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