Cathy Richter, PhD
Dr. Cathy Richter is a Research Molecular Biologist at the Columbia Environmental Research Center.
Science and Products
Effects of Early Life Stage Exposure of Largemouth Bass to Atrazine or a Model Estrogen (17α-Ethinylestradiol)
Early development is a sensitive window for estrogenic endocrine disruption in largemouth bass. Atrazine treatments caused changes to gene expression patterns that were both similar to estrogen and distinct from estrogen.
Threatened, Endangered or Rare Species Detection
The non-invasive nature of eDNA methods for species detection is a great advantage for monitoring of rare, threatened, or endangered species.
Searching for Shiners in Missouri
Researchers from the University of Central Missouri (UCM), in collaboration with the Missouri Department of Conservation (MDC) and Columbia Environmental Research Center (CERC), implement environmental DNA (eDNA) methods to identify and manage Topeka Shiner populations in Missouri.
Molecular Section: eDNA Research
Environmental DNA (eDNA) research at CERC focuses on the development and utility of eDNA tools as well as interpretation of eDNA data in real-world management applications. We work with academic, state, federal and international partners in developing standards and best practices for eDNA technology and exploring the factors that affect eDNA detection in the field. Our lab's eDNA research covers...
Fishing and Hunting Integrated Science Team
The Fishing and Hunting integrated science team focuses on contaminant and pathogen exposures in the environment that could impact the presence and vitality of fish and wildlife populations that drive commercial, recreational and subsistence activities such as hunting and fishing. If actual risks are identified this project will inform how to economically and effectively minimize risk by providing...
Filter Total Items: 19
Effects of estrogens and atrazine on functional immune responses of largemouth bass (Micropterus salmoides)
Disease outbreaks, skin lesions, fish kill events, and reproductive abnormalities have been observed in wild populations of bass in the Chesapeake Bay watershed. Occurrence of synthetic and natural hormones from wastewater treatment plants and livestock operations, pesticides from agricultural lands, and phytoestrogens from cover crops have been implicated as potential causes of these adverse effe
Laboratory estimates of eDNA degradation rates for Actinionais ligamentina eDNA
Data describe a designed environmental DNA (eDNA) experiment for the estimation of eDNA degradation rates for the mucket (Actinonaias ligamentina) from water samples collected in the laboratory. Samples were collected from experiments performed from November 01, 2019 to November 15, 2019 at the USGS Columbia Environmental Research Center, Missouri
Development and testing of a qPCR assay for Lampsilis siliquoidea eDNA
Data describe specificity and sensitivity testing for the L.sil2 assay. This assay is used to amplify eDNA from the freshwater mussel Lampsilis siliquoidea.
Environmental DNA shedding rates in laboratory conditions for Cumberlandia monodonta, Actinonaias ligamentina, and Lampsilis siliquoidea.
Data describe designed environmental DNA (eDNA) experiments for the estimation of eDNA shedding rates for the spectaclecase (Cumberlandia monodonta), mucket (Actinonaias ligamentina), and fatmucket (Lampsilis siliquoidea) from water samples collected in the laboratory under differing laboratory conditions. Shedding rates were tested under variable mussel biomass, diet, and temperature. Parameters
Alternative complement pathway assay data for adult largemouth bass exposed in outdoor ponds to 17alpha-ethinylestradiol or an estrone-atrazine mixture
Alternative complement pathway assay data observed in adult largemouth bass plasma in response to an EE2 (17alpha-ethinylestradiol) or mixture of estrone and atrazine exposure under laboratory pond conditions, with associated fish identification information.
Water chemistry and molecular eDNA data observed in experimental laboratory mesocosms exposed to different nitrogen amendments in the presence or absence of a nitrifier enriched microbial community
Data describe the results of a controlled laboratory mesocosm experiment evaluating the influence of a nitrifier enriched microbial community on silver carp (Hypophthalmichthys molitrix) milt eDNA degradation. Parameters described include the concentration results, limit of detection, and limit of quantification of two silver carp specific quantitative PCR assays and water chemistry results of exp
Data on the detection of Epioblasma capsaeformis using a designed environmental DNA (eDNA) survey upstream and downstream of known populations in the Clinch River, Tennessee (2019 to 2021)
Data describe a designed environmental DNA (eDNA) survey for the detection of oyster mussel (Epioblasma capsaeformis) from field collected water samples. Parameters described include the limit of detection and limit of quantification of the assay; a list of freshwater mussel species tissue samples that were used to test specificity of the assay; and field collected water samples that were tested t
Data on the detection of Cumberlandia monodonta using a designed environmental DNA (eDNA) survey upstream and downstream of known populations in the Big Piney River, Missouri 2020 – 2022 (ver. 2.0, August 2024)
Data describe a designed environmental DNA (eDNA) survey for the detection of Spectaclecase (Cumberlandia monodonta, also referred to as Margaritifera monodonta) from field collected water samples. Parameters described include the limit of detection and limit of quantification of the assay; a list of freshwater mussel species tissue samples that were used to test specificity of the assay; and fiel
Degradation of Cumberlandia monodonta environmental DNA over time in laboratory conditions using the C.monCOI assay
Data describe a designed environmental DNA (eDNA) experiment for the estimation of eDNA degradation rates for the spectaclecase (Cumberlandia monodonta) from water samples collected in the laboratory. Parameters described include laboratory collected water samples that were tested to estimate concentration of spectaclecase DNA and associated quality assurance data. Samples were collected from expe
Thiaminase activity measurements in whole zebrafish
Data describe results of a set of laboratory experiments using a previously described quantitative thiaminase I activity assay to test the thiaminase activity of whole zebrafish homogenates. Parameters described include the thiaminase activity data, dilution factors, incubation time, and tissue weight assayed. Experiments were conducted at the USGS Columbia Environmental Research Center, Columbia,
Water chemistry and fish metrics data for adult largemouth bass exposed in outdoor ponds to 17alpha-ethinylestradiol or an estrone-atrazine mixture
Physiological endpoints observed in adult largemouth bass in response to an EE2 (17 alpha-ethinylestradiol) or mixture of estrone and atrazine exposure under laboratory pond conditions. Also included are water quality and chemical concentration data. Adult LMB were exposed in outdoor pond mesocosms from post-spawning to early gonad recrudescence to either EE2 (2.4 nanograms per liter), or a mixtur
Physiological and molecular endpoints observed in juvenile largemouth bass in response to an estrogen (17α-ethinylestradiol) and subsequently a bacterial challenge (Edwardsiella piscicida) exposure under laboratory conditions.
Physiological and molecular endpoints observed in juvenile largemouth bass in response to an estrogen (17α-ethinylestradiol) and subsequently a bacterial challenge (Edwardsiella piscicida) exposure under laboratory conditions. Also included are water quality and chemical concentration data.
Filter Total Items: 44
Zebra and Quagga mussels in the United States—Dreissenid mussel research by the U.S. Geological Survey
The U.S. Geological Survey (USGS) delivers high-quality data, technologies, and decision-support tools to help managers both reduce existing populations and control the spread of dreissenid mussels. The USGS researches ecology, biology, risk assessment, and early detection and rapid response methods; provides decision support; and develops and tests control measures.
Authors
Cayla R. Morningstar, Patrick M. Kočovský, Michael E. Colvin, Timothy D. Counihan, Wesley M. Daniel, Peter C. Esselman, Cathy A. Richter, Adam Sepulveda, Diane L. Waller
By
Ecosystems Mission Area, Biological Threats and Invasive Species Research Program, Columbia Environmental Research Center, Great Lakes Science Center, Northern Rocky Mountain Science Center, Upper Midwest Environmental Sciences Center, Western Fisheries Research Center, Wetland and Aquatic Research Center
First documentation of grass carp spawning in Lake Erie’s Central Basin
Grass carp (Ctenopharyngodon idella) are non-indigenous to North America having been translocated to the United States in the 1960s as a potential non-chemical solution for nuisance aquatic vegetation. Reproductively viable grass carp now exist in many watersheds in the United States. In the Great Lakes basin, grass carp were first discovered in the 1980s with direct confirmation of successful rep
Authors
Corbin David Hilling, Adam J. Landry, James Roberts, Nathan Thompson, Cathy A. Richter, Ryan E. Brown, Christine M. Mayer, Song S. Qian
Immunomodulation in adult largemouth bass (Micropterus salmoides) exposed to a model estrogen or mixture of endocrine disrupting contaminants during early gonadal recrudescence
Disease outbreaks, skin lesions, fish kill events, and reproductive abnormalities have been observed in wild populations of Centrarchids in watersheds throughout the United States. Occurrence of synthetic and natural hormones from wastewater treatment plants and livestock operations, pesticides from agricultural land use, and phytoestrogens have been implicated as potential causes of these adverse
Authors
Jessica Kristin Leet, Catherine A. Richter, Rachel Claunch, Robert Gale, Donald E. Tillitt, Luke R. Iwanowicz
Evolutionary and ecological correlates of thiaminase in fishes
Thiamine (vitamin B1) is required by all living organisms in multiple metabolic pathways. It is scarce in natural systems, and deficiency can lead to reproductive failure, neurological issues, and death. One major cause of thiamine deficiency is an overreliance on diet items containing the enzyme thiaminase. Thiaminase activity has been noted in many prey fishes and linked to cohort failure in sal
Authors
Freya Elizabeth Rowland, Cathy A. Richter, Donald E Tillitt, David Walters
Toward invasive mussel genetic biocontrol: Approaches, challenges, and perspectives
Invasive freshwater mussels, such as the zebra (Dreissena polymorpha), quagga (Dreissena rostriformis bugensis), and golden (Limnoperna fortunei) mussel have spread outside their native ranges throughout many regions of the North American, South American, and European continents in recent decades, damaging infrastructure and the environment. This review describes ongoing efforts by multiple groups
Authors
Victor H. Hernandez Elizarraga, Scott Ballantyne, Lindsey Gengelbach, Juliana A. Americo, Steven T. Suhr, Marie-Claude Senut, Ben Minerich, Christopher M. Merkes, Thea M. Edwards, Katy E. Klymus, Cathy A. Richter, Diane L. Waller, Yale J. Passamaneck, Mauro de F. Rebelo, Daryl M. Gohl
A nitrifier-enriched microbial community contributes to the degradation of environmental DNA
Environmental DNA (eDNA) surveys are a promising alternative to traditional monitoring of invasive species, rare species, and biodiversity. Detecting organism-specific eDNA reduces the need to collect physical specimens for population estimates, and the high sensitivity of eDNA assays may improve detection of rare or cryptic species. However, correlating estimated concentrations of eDNA with speci
Authors
Rachelle Elaine Beattie, Caren C. Helbing, Jacob J. Imbery, Katy E. Klymus, Jonathan Lopez Duran, Cathy A. Richter, Anita A. Thambirajah, Nathan Thompson, Thea M. Edwards
When are environmental DNA early detections of invasive species actionable?
Environmental DNA (eDNA) sampling provides sensitive early detection capabilities for recently introduced taxa. However, natural resource managers struggle with how to integrate eDNA results into an early detection rapid response program because positive eDNA detections are not always indicative of an eventual infestation. We used a structured decision making (SDM) framework to evaluate appropriat
Authors
Adam Sepulveda, Christine E. Dumoulin, Denise L. Blanchette, John Mcphedran, Colin Holme, Nathan Whalen, Margaret Hunter, Christopher M. Merkes, Catherine A. Richter, Matthew Neilson, Wesley M. Daniel, Devin Nicole Jones, David R. Smith
Genetic basis of thiaminase I activity in a vertebrate, zebrafish Danio rerio
Thiamine (vitamin B1) metabolism is an important driver of human and animal health and ecological functioning. Some organisms, including species of ferns, mollusks, and fish, contain thiamine-degrading enzymes known as thiaminases, and consumption of these organisms can lead to thiamine deficiency in the consumer. Consumption of fish containing thiaminase has led to elevated mortality and recruitm
Authors
Cathy A. Richter, Allison N. Evans, Scott A. Heppell, James L. Zajicek, Donald E. Tillitt
Grass carp reproduction in small tributaries of Truman Reservoir, Missouri: Implications for establishment in novel habitats
Substantial work has been conducted to estimate the river length required for recruitment of invasive Grass Carp Ctenopharyngodon idella and bigheaded carps (Bighead Carp Hypophthalmichthys nobilis and Silver Carp H. molitrix); however, the distance upstream and size of stream required for spawning remain unclear. Adult Grass Carp are regularly captured in Harry S. Truman Reservoir, Missouri, alth
Authors
Cari-Ann Hayer, Michael F. Bayless, Cathy A. Richter, Amy E. George, Duane Chapman
Declines in reproductive condition of male largemouth bass (Micropterus salmoides) following seasonal exposure to estrogenic endocrine-disrupting compounds
Reproductive abnormalities, that could lead to possible effects at the population level, have been observed in wild fish throughout the United States, with high prevalence in largemouth bass (LMB; Micropterus salmoides) and smallmouth bass (Micropterus dolomieu). Estrone (E1) and atrazine (ATR) are common environmental contaminants often associated with agricultural land use. 17alpha-ethinylestrad
Authors
Jessica Kristin Leet, Cathy A. Richter, Robert Gale, Donald E. Tillitt, Jill Jenkins
Exposure to 17α-ethinylestradiol results in differential susceptibility of largemouth bass (Micropterus salmoides) to bacterial infection
Disease outbreaks, skin lesions, mortality events, and reproductive abnormalities have been observed in wild populations of centrarchids. The presence of estrogenic endocrine disrupting compounds (EEDCs) has been implicated as a potential causal factor for these effects. The effects of prior EEDC exposure on immune response were examined in juvenile largemouth bass (Micropterus salmoides) exposed
Authors
Jessica Kristin Leet, Justin Greer, Cathy A. Richter, Luke R. Iwanowicz, Edward Spinard, Jacquelyn McDonald, Carla M. Conway, Robert W. Gale, Donald E. Tillitt, John Hansen
Using structured decision making to evaluate potential management responses to detection of dreissenid mussel (Dreissena spp.) environmental DNA
Environmental (e)DNA tools are sensitive and cost-effective for early detection of invasive species. However, the uncertainty associated with the interpretation of positive eDNA detections makes it challenging to determine appropriate natural resource management responses. Multiple sources of error can give rise to positive detections of eDNA in a sample when individuals of that species are not pr
Authors
Adam Sepulveda, David R. Smith, Katherine M O'Donnell, Nathan Owens, Brittany White, Cathy A. Richter, Christopher M. Merkes, Skylar Wolf, Mike Rau, Matthew Neilson, Wesley M. Daniel, Christine E. Dumoulin, Margaret Hunter
Non-USGS Publications**
Taylor, J.A., Richter, C.A., Suzuki, A., Watanabe, H., Iguchi, T., Coser, K.R., Shioda, T., and vom Saal, F.S., 2012, Dose-related estrogen effects on gene expression in fetal mouse prostate mesenchymal cells: PLOS ONE, v. 7, no. 10, p. e48311
Taylor, J.A., Richter, C.A., Ruhlen, R.L., and vom Saal, F.S., 2011, Estrogenic environmental chemicals and drugs: Mechanisms for effects on the developing male urogenital system: The Journal of Steroid Biochemistry and Molecular Biology, v. 127, no. 1, p. 83-95
Richter, C.A., Taylor, J.A., Ruhlen, R.L., Welshons, W.V., and vom Saal, F.S., 2007, Estradiol and Bisphenol A stimulate androgen receptor and estrogen receptor gene expression in fetal mouse prostate mesenchyme cells: Environmental Health Perspectives, v. 115, no. 6, p. 902-908
vom Saal, F.S., Richter, C.A., Mao, J., and Welshons, W.V., 2005, Commercial animal feed: Variability in estrogenic activity and effects on body weight in mice: Birth Defects Research Part A: Clinical and Molecular Teratology, v. 73, no. 7, p. 474-475
Timms, B.G., Howdeshell, K.L., Barton, L., Bradley, S., Richter, C.A., and vom Saal, F.S., 2005, Estrogenic chemicals in plastic and oral contraceptives disrupt development of the fetal mouse prostate and urethra: Proceedings of the National Academy of Sciences of the United States of America, v. 102, no. 19, p. 7014-7019
Richter, C., Timms, B., and vom Saal, F., 2005, Prostate development: mechanisms for opposite effects of low and high doses of estrogenic chemicals, in Naz, R., ed., Endocrine Disruptors: Effects on Male and Female Reproductive Systems: New York, CRC Press, p. 379-410.
vom Saal, F.S., Richter, C.A., Ruhlen, R.R., Nagel, S.C., Timms, B.G., and Welshons, W.V., 2005, The importance of appropriate controls, animal feed, and animal models in interpreting results from low-dose studies of bisphenol A: Birth Defects Research Part A: Clinical and Molecular Teratology, v. 73, no. 3, p. 140-145
vom Saal, F.S., Richter, C.A., Ruhlen, R.R., Nagel, S.C., and Welshons, W.V., 2004, Disruption of laboratory experiments due to leaching of Bisphenol A from polycarbonate cages and bottles and uncontrolled variability in components of animal feed, in National Research Council, ed., The Development of Science-based Guidelines for Laboratory Animal Care: Proceedings of the November 2003 International Workshop: The National Academies Press, p. 65-69.
**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
Effects of Early Life Stage Exposure of Largemouth Bass to Atrazine or a Model Estrogen (17α-Ethinylestradiol)
Early development is a sensitive window for estrogenic endocrine disruption in largemouth bass. Atrazine treatments caused changes to gene expression patterns that were both similar to estrogen and distinct from estrogen.
Threatened, Endangered or Rare Species Detection
The non-invasive nature of eDNA methods for species detection is a great advantage for monitoring of rare, threatened, or endangered species.
Searching for Shiners in Missouri
Researchers from the University of Central Missouri (UCM), in collaboration with the Missouri Department of Conservation (MDC) and Columbia Environmental Research Center (CERC), implement environmental DNA (eDNA) methods to identify and manage Topeka Shiner populations in Missouri.
Molecular Section: eDNA Research
Environmental DNA (eDNA) research at CERC focuses on the development and utility of eDNA tools as well as interpretation of eDNA data in real-world management applications. We work with academic, state, federal and international partners in developing standards and best practices for eDNA technology and exploring the factors that affect eDNA detection in the field. Our lab's eDNA research covers...
Fishing and Hunting Integrated Science Team
The Fishing and Hunting integrated science team focuses on contaminant and pathogen exposures in the environment that could impact the presence and vitality of fish and wildlife populations that drive commercial, recreational and subsistence activities such as hunting and fishing. If actual risks are identified this project will inform how to economically and effectively minimize risk by providing...
Filter Total Items: 19
Effects of estrogens and atrazine on functional immune responses of largemouth bass (Micropterus salmoides)
Disease outbreaks, skin lesions, fish kill events, and reproductive abnormalities have been observed in wild populations of bass in the Chesapeake Bay watershed. Occurrence of synthetic and natural hormones from wastewater treatment plants and livestock operations, pesticides from agricultural lands, and phytoestrogens from cover crops have been implicated as potential causes of these adverse effe
Laboratory estimates of eDNA degradation rates for Actinionais ligamentina eDNA
Data describe a designed environmental DNA (eDNA) experiment for the estimation of eDNA degradation rates for the mucket (Actinonaias ligamentina) from water samples collected in the laboratory. Samples were collected from experiments performed from November 01, 2019 to November 15, 2019 at the USGS Columbia Environmental Research Center, Missouri
Development and testing of a qPCR assay for Lampsilis siliquoidea eDNA
Data describe specificity and sensitivity testing for the L.sil2 assay. This assay is used to amplify eDNA from the freshwater mussel Lampsilis siliquoidea.
Environmental DNA shedding rates in laboratory conditions for Cumberlandia monodonta, Actinonaias ligamentina, and Lampsilis siliquoidea.
Data describe designed environmental DNA (eDNA) experiments for the estimation of eDNA shedding rates for the spectaclecase (Cumberlandia monodonta), mucket (Actinonaias ligamentina), and fatmucket (Lampsilis siliquoidea) from water samples collected in the laboratory under differing laboratory conditions. Shedding rates were tested under variable mussel biomass, diet, and temperature. Parameters
Alternative complement pathway assay data for adult largemouth bass exposed in outdoor ponds to 17alpha-ethinylestradiol or an estrone-atrazine mixture
Alternative complement pathway assay data observed in adult largemouth bass plasma in response to an EE2 (17alpha-ethinylestradiol) or mixture of estrone and atrazine exposure under laboratory pond conditions, with associated fish identification information.
Water chemistry and molecular eDNA data observed in experimental laboratory mesocosms exposed to different nitrogen amendments in the presence or absence of a nitrifier enriched microbial community
Data describe the results of a controlled laboratory mesocosm experiment evaluating the influence of a nitrifier enriched microbial community on silver carp (Hypophthalmichthys molitrix) milt eDNA degradation. Parameters described include the concentration results, limit of detection, and limit of quantification of two silver carp specific quantitative PCR assays and water chemistry results of exp
Data on the detection of Epioblasma capsaeformis using a designed environmental DNA (eDNA) survey upstream and downstream of known populations in the Clinch River, Tennessee (2019 to 2021)
Data describe a designed environmental DNA (eDNA) survey for the detection of oyster mussel (Epioblasma capsaeformis) from field collected water samples. Parameters described include the limit of detection and limit of quantification of the assay; a list of freshwater mussel species tissue samples that were used to test specificity of the assay; and field collected water samples that were tested t
Data on the detection of Cumberlandia monodonta using a designed environmental DNA (eDNA) survey upstream and downstream of known populations in the Big Piney River, Missouri 2020 – 2022 (ver. 2.0, August 2024)
Data describe a designed environmental DNA (eDNA) survey for the detection of Spectaclecase (Cumberlandia monodonta, also referred to as Margaritifera monodonta) from field collected water samples. Parameters described include the limit of detection and limit of quantification of the assay; a list of freshwater mussel species tissue samples that were used to test specificity of the assay; and fiel
Degradation of Cumberlandia monodonta environmental DNA over time in laboratory conditions using the C.monCOI assay
Data describe a designed environmental DNA (eDNA) experiment for the estimation of eDNA degradation rates for the spectaclecase (Cumberlandia monodonta) from water samples collected in the laboratory. Parameters described include laboratory collected water samples that were tested to estimate concentration of spectaclecase DNA and associated quality assurance data. Samples were collected from expe
Thiaminase activity measurements in whole zebrafish
Data describe results of a set of laboratory experiments using a previously described quantitative thiaminase I activity assay to test the thiaminase activity of whole zebrafish homogenates. Parameters described include the thiaminase activity data, dilution factors, incubation time, and tissue weight assayed. Experiments were conducted at the USGS Columbia Environmental Research Center, Columbia,
Water chemistry and fish metrics data for adult largemouth bass exposed in outdoor ponds to 17alpha-ethinylestradiol or an estrone-atrazine mixture
Physiological endpoints observed in adult largemouth bass in response to an EE2 (17 alpha-ethinylestradiol) or mixture of estrone and atrazine exposure under laboratory pond conditions. Also included are water quality and chemical concentration data. Adult LMB were exposed in outdoor pond mesocosms from post-spawning to early gonad recrudescence to either EE2 (2.4 nanograms per liter), or a mixtur
Physiological and molecular endpoints observed in juvenile largemouth bass in response to an estrogen (17α-ethinylestradiol) and subsequently a bacterial challenge (Edwardsiella piscicida) exposure under laboratory conditions.
Physiological and molecular endpoints observed in juvenile largemouth bass in response to an estrogen (17α-ethinylestradiol) and subsequently a bacterial challenge (Edwardsiella piscicida) exposure under laboratory conditions. Also included are water quality and chemical concentration data.
Filter Total Items: 44
Zebra and Quagga mussels in the United States—Dreissenid mussel research by the U.S. Geological Survey
The U.S. Geological Survey (USGS) delivers high-quality data, technologies, and decision-support tools to help managers both reduce existing populations and control the spread of dreissenid mussels. The USGS researches ecology, biology, risk assessment, and early detection and rapid response methods; provides decision support; and develops and tests control measures.
Authors
Cayla R. Morningstar, Patrick M. Kočovský, Michael E. Colvin, Timothy D. Counihan, Wesley M. Daniel, Peter C. Esselman, Cathy A. Richter, Adam Sepulveda, Diane L. Waller
By
Ecosystems Mission Area, Biological Threats and Invasive Species Research Program, Columbia Environmental Research Center, Great Lakes Science Center, Northern Rocky Mountain Science Center, Upper Midwest Environmental Sciences Center, Western Fisheries Research Center, Wetland and Aquatic Research Center
First documentation of grass carp spawning in Lake Erie’s Central Basin
Grass carp (Ctenopharyngodon idella) are non-indigenous to North America having been translocated to the United States in the 1960s as a potential non-chemical solution for nuisance aquatic vegetation. Reproductively viable grass carp now exist in many watersheds in the United States. In the Great Lakes basin, grass carp were first discovered in the 1980s with direct confirmation of successful rep
Authors
Corbin David Hilling, Adam J. Landry, James Roberts, Nathan Thompson, Cathy A. Richter, Ryan E. Brown, Christine M. Mayer, Song S. Qian
Immunomodulation in adult largemouth bass (Micropterus salmoides) exposed to a model estrogen or mixture of endocrine disrupting contaminants during early gonadal recrudescence
Disease outbreaks, skin lesions, fish kill events, and reproductive abnormalities have been observed in wild populations of Centrarchids in watersheds throughout the United States. Occurrence of synthetic and natural hormones from wastewater treatment plants and livestock operations, pesticides from agricultural land use, and phytoestrogens have been implicated as potential causes of these adverse
Authors
Jessica Kristin Leet, Catherine A. Richter, Rachel Claunch, Robert Gale, Donald E. Tillitt, Luke R. Iwanowicz
Evolutionary and ecological correlates of thiaminase in fishes
Thiamine (vitamin B1) is required by all living organisms in multiple metabolic pathways. It is scarce in natural systems, and deficiency can lead to reproductive failure, neurological issues, and death. One major cause of thiamine deficiency is an overreliance on diet items containing the enzyme thiaminase. Thiaminase activity has been noted in many prey fishes and linked to cohort failure in sal
Authors
Freya Elizabeth Rowland, Cathy A. Richter, Donald E Tillitt, David Walters
Toward invasive mussel genetic biocontrol: Approaches, challenges, and perspectives
Invasive freshwater mussels, such as the zebra (Dreissena polymorpha), quagga (Dreissena rostriformis bugensis), and golden (Limnoperna fortunei) mussel have spread outside their native ranges throughout many regions of the North American, South American, and European continents in recent decades, damaging infrastructure and the environment. This review describes ongoing efforts by multiple groups
Authors
Victor H. Hernandez Elizarraga, Scott Ballantyne, Lindsey Gengelbach, Juliana A. Americo, Steven T. Suhr, Marie-Claude Senut, Ben Minerich, Christopher M. Merkes, Thea M. Edwards, Katy E. Klymus, Cathy A. Richter, Diane L. Waller, Yale J. Passamaneck, Mauro de F. Rebelo, Daryl M. Gohl
A nitrifier-enriched microbial community contributes to the degradation of environmental DNA
Environmental DNA (eDNA) surveys are a promising alternative to traditional monitoring of invasive species, rare species, and biodiversity. Detecting organism-specific eDNA reduces the need to collect physical specimens for population estimates, and the high sensitivity of eDNA assays may improve detection of rare or cryptic species. However, correlating estimated concentrations of eDNA with speci
Authors
Rachelle Elaine Beattie, Caren C. Helbing, Jacob J. Imbery, Katy E. Klymus, Jonathan Lopez Duran, Cathy A. Richter, Anita A. Thambirajah, Nathan Thompson, Thea M. Edwards
When are environmental DNA early detections of invasive species actionable?
Environmental DNA (eDNA) sampling provides sensitive early detection capabilities for recently introduced taxa. However, natural resource managers struggle with how to integrate eDNA results into an early detection rapid response program because positive eDNA detections are not always indicative of an eventual infestation. We used a structured decision making (SDM) framework to evaluate appropriat
Authors
Adam Sepulveda, Christine E. Dumoulin, Denise L. Blanchette, John Mcphedran, Colin Holme, Nathan Whalen, Margaret Hunter, Christopher M. Merkes, Catherine A. Richter, Matthew Neilson, Wesley M. Daniel, Devin Nicole Jones, David R. Smith
Genetic basis of thiaminase I activity in a vertebrate, zebrafish Danio rerio
Thiamine (vitamin B1) metabolism is an important driver of human and animal health and ecological functioning. Some organisms, including species of ferns, mollusks, and fish, contain thiamine-degrading enzymes known as thiaminases, and consumption of these organisms can lead to thiamine deficiency in the consumer. Consumption of fish containing thiaminase has led to elevated mortality and recruitm
Authors
Cathy A. Richter, Allison N. Evans, Scott A. Heppell, James L. Zajicek, Donald E. Tillitt
Grass carp reproduction in small tributaries of Truman Reservoir, Missouri: Implications for establishment in novel habitats
Substantial work has been conducted to estimate the river length required for recruitment of invasive Grass Carp Ctenopharyngodon idella and bigheaded carps (Bighead Carp Hypophthalmichthys nobilis and Silver Carp H. molitrix); however, the distance upstream and size of stream required for spawning remain unclear. Adult Grass Carp are regularly captured in Harry S. Truman Reservoir, Missouri, alth
Authors
Cari-Ann Hayer, Michael F. Bayless, Cathy A. Richter, Amy E. George, Duane Chapman
Declines in reproductive condition of male largemouth bass (Micropterus salmoides) following seasonal exposure to estrogenic endocrine-disrupting compounds
Reproductive abnormalities, that could lead to possible effects at the population level, have been observed in wild fish throughout the United States, with high prevalence in largemouth bass (LMB; Micropterus salmoides) and smallmouth bass (Micropterus dolomieu). Estrone (E1) and atrazine (ATR) are common environmental contaminants often associated with agricultural land use. 17alpha-ethinylestrad
Authors
Jessica Kristin Leet, Cathy A. Richter, Robert Gale, Donald E. Tillitt, Jill Jenkins
Exposure to 17α-ethinylestradiol results in differential susceptibility of largemouth bass (Micropterus salmoides) to bacterial infection
Disease outbreaks, skin lesions, mortality events, and reproductive abnormalities have been observed in wild populations of centrarchids. The presence of estrogenic endocrine disrupting compounds (EEDCs) has been implicated as a potential causal factor for these effects. The effects of prior EEDC exposure on immune response were examined in juvenile largemouth bass (Micropterus salmoides) exposed
Authors
Jessica Kristin Leet, Justin Greer, Cathy A. Richter, Luke R. Iwanowicz, Edward Spinard, Jacquelyn McDonald, Carla M. Conway, Robert W. Gale, Donald E. Tillitt, John Hansen
Using structured decision making to evaluate potential management responses to detection of dreissenid mussel (Dreissena spp.) environmental DNA
Environmental (e)DNA tools are sensitive and cost-effective for early detection of invasive species. However, the uncertainty associated with the interpretation of positive eDNA detections makes it challenging to determine appropriate natural resource management responses. Multiple sources of error can give rise to positive detections of eDNA in a sample when individuals of that species are not pr
Authors
Adam Sepulveda, David R. Smith, Katherine M O'Donnell, Nathan Owens, Brittany White, Cathy A. Richter, Christopher M. Merkes, Skylar Wolf, Mike Rau, Matthew Neilson, Wesley M. Daniel, Christine E. Dumoulin, Margaret Hunter
Non-USGS Publications**
Taylor, J.A., Richter, C.A., Suzuki, A., Watanabe, H., Iguchi, T., Coser, K.R., Shioda, T., and vom Saal, F.S., 2012, Dose-related estrogen effects on gene expression in fetal mouse prostate mesenchymal cells: PLOS ONE, v. 7, no. 10, p. e48311
Taylor, J.A., Richter, C.A., Ruhlen, R.L., and vom Saal, F.S., 2011, Estrogenic environmental chemicals and drugs: Mechanisms for effects on the developing male urogenital system: The Journal of Steroid Biochemistry and Molecular Biology, v. 127, no. 1, p. 83-95
Richter, C.A., Taylor, J.A., Ruhlen, R.L., Welshons, W.V., and vom Saal, F.S., 2007, Estradiol and Bisphenol A stimulate androgen receptor and estrogen receptor gene expression in fetal mouse prostate mesenchyme cells: Environmental Health Perspectives, v. 115, no. 6, p. 902-908
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