Christopher Guy, PhD (Former Employee)
Science and Products
Filter Total Items: 64
Reproductive indices and observations of mass ovarian follicular atresia in hatchery-origin pallid sturgeon Reproductive indices and observations of mass ovarian follicular atresia in hatchery-origin pallid sturgeon
The Pallid Sturgeon (Scaphirhynchus albus) Conservation Propagation and Stocking Program began stocking in the Missouri River above Fort Peck Reservoir in 1998 with 1997-year-class pallid sturgeon. Within the 1997-year class, all hatchery-origin pallid sturgeon females that reached reproductive maturation by 2016 underwent mass ovarian follicular atresia. Using combined historical and...
Authors
Tanner L. Cox, Christopher S. Guy, Luke M. Holmquist, Molly A. H. Webb
Response of nutrient limitation to invasive fish suppression: How carcasses and analog pellets alter periphyton Response of nutrient limitation to invasive fish suppression: How carcasses and analog pellets alter periphyton
The native Yellowstone Cutthroat Trout (Oncorhynchus clarkii bouvieri Jordan and Gilbert, 1883) population in Yellowstone Lake, Yellowstone National Park, Wyoming, USA, is in decline because of competition from the introduced, invasive Lake Trout (Salvelinus namaycush Walbaum in Artedi, 1792). Gillnetting is used to suppress adult Lake Trout; however, methods are being developed to...
Authors
Dominique R. Lujan, Lusha M. Tronstad, Michelle A. Briggs, Lindsey K. Albertson, Hayley C. Glassic, Christopher S. Guy, Todd M Koel
Accuracy of histology, endoscopy, ultrasonography, and plasma sex steroids in describing the population reproductive structure of hatchery-origin and wild white sturgeon Accuracy of histology, endoscopy, ultrasonography, and plasma sex steroids in describing the population reproductive structure of hatchery-origin and wild white sturgeon
Hatchery-origin white sturgeon Acipenser transmontanus in the lower Columbia River, Canada are approaching puberty, and describing the reproductive structure of the population is critical to determine if they are capable of contributing to spawning events in the wild, a key management uncertainty. Few studies have compared the accuracy of available tools (histology, ultrasound, endoscopy...
Authors
Paige A. C. Maskill, James A. Crossman, Molly A. H. Webb, Marco M. Marrello, Christopher S. Guy
Diets and stable isotope signatures of native and nonnative Leucisid fishes advances our understanding of the Yellowstone Lake food web Diets and stable isotope signatures of native and nonnative Leucisid fishes advances our understanding of the Yellowstone Lake food web
(1) Many forage fishes, such as Leucisids (minnows) have depauperate studies on diet composition or stable isotope signatures, as these fishes are often only viewed as food for higher trophic levels. The need exists to understand and document the diet and stable isotope signatures of Leucisids (redside shiner, longnose dace, lake chub) in relation to the community ecology and food-web...
Authors
Hayley C. Glassic, Christopher S. Guy, Todd M. Koel
Quantifying the spatial structure of invasive lake trout in Yellowstone Lake to improve suppression efficacy Quantifying the spatial structure of invasive lake trout in Yellowstone Lake to improve suppression efficacy
Invasive Lake Trout Salvelinus namaycush have altered the once-pristine Yellowstone Lake ecosystem through top-down effects by consuming Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri. To conserve Yellowstone Cutthroat Trout and restore the ecosystem, a Lake Trout gillnetting program was implemented to suppress the invasive population. We evaluated the spatial structure of...
Authors
Jacob R. Williams, Christopher S. Guy, Patricia E. Bigelow, Todd M. Koel
Burbot (Lota lota) exhibit plasticity in life-history traits in a small drainage at the southwestern-most extent of the species’ native range Burbot (Lota lota) exhibit plasticity in life-history traits in a small drainage at the southwestern-most extent of the species’ native range
Little is known about the life-history traits exhibited by burbot (Lota lota) throughout their circumpolar range. Monitoring PIT-tagged burbot between lentic and lotic habits and collection of demographic data (length, age, sex, and maturity) were used to answer the following questions in the Torrey Creek drainage of west-central Wyoming, USA: 1) is there plasticity in the life-history...
Authors
Jeff Glaid, Christopher S. Guy, Paul C. Gerrity
Science and Products
Filter Total Items: 64
Reproductive indices and observations of mass ovarian follicular atresia in hatchery-origin pallid sturgeon Reproductive indices and observations of mass ovarian follicular atresia in hatchery-origin pallid sturgeon
The Pallid Sturgeon (Scaphirhynchus albus) Conservation Propagation and Stocking Program began stocking in the Missouri River above Fort Peck Reservoir in 1998 with 1997-year-class pallid sturgeon. Within the 1997-year class, all hatchery-origin pallid sturgeon females that reached reproductive maturation by 2016 underwent mass ovarian follicular atresia. Using combined historical and...
Authors
Tanner L. Cox, Christopher S. Guy, Luke M. Holmquist, Molly A. H. Webb
Response of nutrient limitation to invasive fish suppression: How carcasses and analog pellets alter periphyton Response of nutrient limitation to invasive fish suppression: How carcasses and analog pellets alter periphyton
The native Yellowstone Cutthroat Trout (Oncorhynchus clarkii bouvieri Jordan and Gilbert, 1883) population in Yellowstone Lake, Yellowstone National Park, Wyoming, USA, is in decline because of competition from the introduced, invasive Lake Trout (Salvelinus namaycush Walbaum in Artedi, 1792). Gillnetting is used to suppress adult Lake Trout; however, methods are being developed to...
Authors
Dominique R. Lujan, Lusha M. Tronstad, Michelle A. Briggs, Lindsey K. Albertson, Hayley C. Glassic, Christopher S. Guy, Todd M Koel
Accuracy of histology, endoscopy, ultrasonography, and plasma sex steroids in describing the population reproductive structure of hatchery-origin and wild white sturgeon Accuracy of histology, endoscopy, ultrasonography, and plasma sex steroids in describing the population reproductive structure of hatchery-origin and wild white sturgeon
Hatchery-origin white sturgeon Acipenser transmontanus in the lower Columbia River, Canada are approaching puberty, and describing the reproductive structure of the population is critical to determine if they are capable of contributing to spawning events in the wild, a key management uncertainty. Few studies have compared the accuracy of available tools (histology, ultrasound, endoscopy...
Authors
Paige A. C. Maskill, James A. Crossman, Molly A. H. Webb, Marco M. Marrello, Christopher S. Guy
Diets and stable isotope signatures of native and nonnative Leucisid fishes advances our understanding of the Yellowstone Lake food web Diets and stable isotope signatures of native and nonnative Leucisid fishes advances our understanding of the Yellowstone Lake food web
(1) Many forage fishes, such as Leucisids (minnows) have depauperate studies on diet composition or stable isotope signatures, as these fishes are often only viewed as food for higher trophic levels. The need exists to understand and document the diet and stable isotope signatures of Leucisids (redside shiner, longnose dace, lake chub) in relation to the community ecology and food-web...
Authors
Hayley C. Glassic, Christopher S. Guy, Todd M. Koel
Quantifying the spatial structure of invasive lake trout in Yellowstone Lake to improve suppression efficacy Quantifying the spatial structure of invasive lake trout in Yellowstone Lake to improve suppression efficacy
Invasive Lake Trout Salvelinus namaycush have altered the once-pristine Yellowstone Lake ecosystem through top-down effects by consuming Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri. To conserve Yellowstone Cutthroat Trout and restore the ecosystem, a Lake Trout gillnetting program was implemented to suppress the invasive population. We evaluated the spatial structure of...
Authors
Jacob R. Williams, Christopher S. Guy, Patricia E. Bigelow, Todd M. Koel
Burbot (Lota lota) exhibit plasticity in life-history traits in a small drainage at the southwestern-most extent of the species’ native range Burbot (Lota lota) exhibit plasticity in life-history traits in a small drainage at the southwestern-most extent of the species’ native range
Little is known about the life-history traits exhibited by burbot (Lota lota) throughout their circumpolar range. Monitoring PIT-tagged burbot between lentic and lotic habits and collection of demographic data (length, age, sex, and maturity) were used to answer the following questions in the Torrey Creek drainage of west-central Wyoming, USA: 1) is there plasticity in the life-history...
Authors
Jeff Glaid, Christopher S. Guy, Paul C. Gerrity