561 items found

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ID: Invasive species fact sheet: waterfleas
Invasive species fact sheet: waterfleas
Type: Fact Sheet
Subjects: Waterfleas
<em>Bythotrephes longimanus</em> (Spiny)
<em>Ceropagis pengoi</em> (Fishhook)
<em>Daphnia lumholtzi</em>
Invasive species
Item 

        Invasive species fact sheet: waterfleas    
Type:Fact Sheet
Subject:Waterfleas
<em>Bythotrephes longimanus</em> (Spiny)
<em>Ceropagis pengoi</em> (Fishhook)
<em>Daphnia lumholtzi</em>
Invasive species

                    Description:Waterfleas are zooplankton aquatic crustaceans that have a jumpy or jerky mode of swimming. The Daphnia waterflea was introduced from the aquarium trade and fish stocking. They are native to Africa, Asia and Australia. Like invasive mussels, the Bythotrephes and Ceropagis were introduced into the Great Lakes from ships' ballast water coming from Eurasia. Unlike the fleas dogs are known to carry, waterfleas are very different. They do not live outside the water, and do not bite or harm people or pets. [show more]                

ID: Investigating the Habitat Use and Hatching Ecology of the Giant Stonefly
Investigating the Habitat Use and Hatching Ecology of the Giant Stonefly

Type: 
Subjects: 
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        Investigating the Habitat Use and Hatching Ecology of the Giant Stonefly

    

                    Description:Led By
Dan Kowalski 
Study Area
Colorado, Gunnison and Rio Grande Rivers
Project Status
Complete
Research Objectives
To investigate the influence of physical habitat conditions on the giant stonefly Pteronarcys californica density in Colorado rivers.
Project Description
Past studies show that giant stoneflies (also known as salmonflies or willow flies), serve as a primary food source for trout in Colorado rivers where they occur. They live as aquatic larvae in rivers for 3-4 years before emerging as winged adults in June to mate and die. Their large and synchronous emergence produces some of the best fishing of the year and is eagerly anticipated by many anglers. The species' high densities and large size also make them important in the flow of energy and nutrients between aquatic and riparian systems. Although giant stoneflies can exist at extremely high numbers in certain locations, the density and range of this species has decreased in some places most likely in association with changes in stream flows and physical aquatic habitat. 
CPW completed a project to determine the influence of physical stream habitat on giant stonefly density in an effort to identify limiting factors and reasons for the species' decline. To do so, CPW researchers estimated stonefly density at 16 sites on three rivers; the Gunnison, the Colorado, and the Rio Grande and measured habitat variables at each site. 
The results of this study indicated that percent fine sediment, cobble embeddedness and average cobble size were the best predictors of stonefly density. Fine sediment is defined as sand, silt and clay particles less than 2 mm in diameter. As fine sediment levels increased, stonefly density decreased. The D50 is the median cobble size and as it increased so did stonefly density. Embeddedness is the extent that cobbles are submerged or buried by silt, stonefly densities were higher in areas with low embeddedness. Fine sediment was the single best predictor of the habitat variables and it explained 45% of the variability in stonefly density while a model with all of the top three variables explained about half of overall variability (50%), so further research is necessary to identify other environmental factors that could be influencing stonefly density. To support an average density of stoneflies (compared to sites in these three Colorado Rivers), a site would have approximately 5.1% fine sediment in the riffles while maximum stonefly densities could be expected with sites that have 0-2.5% fine sediment. 
The results of this study indicate that giant stoneflies prefer riffle habitat with low fine sediment, larger sized cobble and low levels of cobble embeddedness. This information will be used to inform management and restoration activities, as well as to identify sites for giant stonefly re-introductions. By maintaining and restoring giant stonefly populations, wildlife managers can protect an important part of native aquatic ecosystems and improve river fisheries for Colorado's anglers.
 [show more]                

ID: Jake Ivan, Wildlife Research Scientist
Jake Ivan, Wildlife Research Scientist
Type: 
Subjects: 
Item 

        Jake Ivan, Wildlife Research Scientist    

                    Description:Jake IvanWildlife Research Scientist, Species of Conservation Concern
Current or Recent Research Projects
Snowshoe Hare Response to Silvicultural Treatments
 href="https://cpw.cvlcollections.org/items/show/640">Monitoring Canada Lynx in Colorado
Mammal and Breeding Bird Response to Bark Beetle Outbreaks
Areas of Interest and Expertise
My research focuses on estimating wildlife population parameters and forest carnivore ecology, conservation and monitoring. 
Streaming Videos
Catching pine
Lynx: shadows of the forest
Snowshoe hare
Snowshoe hare releases
Snowshoe hare trapping, collaring and release
Select Publications
Ivan, J. S. 2024. Canada Lynx (lynx Canadensis). Pages 129-152 in J. E. Cartron and J. K. Frey, Eds. Wild Carnivores of New Mexico. University of New Mexico Press.
Hooten, M. B., M. R. Schwob, D. S. Johnson and J. S. Ivan. 2024. Geostatistical capture-recapture models​​. Spatial Statistics 59:100817. doi.org/10.1016/j.spasta.2024.100817​
Squires, J. R., Olson, L. E., Ivan, J. S., McDonald, P. M., and Holbrook, J. D. 2024. Anthropogenically protected but naturally disturbed: a specialist carnivore at its southern range periphery. Biodiversity and Conservation. https://doi.org/10.1007/s10531-024-02978-8
Hooten, M. B., M. R. Schwob, D. S. Johnson, and J. S. Ivan. 2023. Multistage hierarchical capture-recapture models. Environmetrics 34:e2799. doi.org/10.1002/env.2799
Ivan, J. S., E. S. Newkirk, and B. D. Gerber. 2023. Differential impacts of spruce beetle outbreaks on snowshoe hares and red squirrels in the southern Rocky Mountains​. Forest Ecology and Management 544:121147. doi.org/10.1016/j.foreco.2023.121147
Squire​s, J. R., J. S. Ivan, K. E. Paolini, L. E. Olson, G. M. Jones, and J. D. Holbrook​​. 2022. Keystone structures maintain forest function for Canada lynx after large-scale spruce beetle outbreak​​. Environmental Research: Ecology 2:011001. https://doi.org/10.1088/2752-664X/ac8eb7
Van Ee, J. J., J. S. Ivan, and M. B. Hooten. 2022. Community confounding in joint species distribution models. Scientific Reports 12:1–14. https://doi.org/10.1038/s41598-022-15694-6​
Kraberger, S., L. E. K. Serieys, C. Richet, N. M. Fountain-Jones, G. Baele, J. M. Bishop, M. Nehring, J. S. Ivan, E. S. Newkirk, J. R. Squires, M. C. Lund, S. P. D. Riley, C. C. Wilmers, P. D. van Helden, K. Van Doorslaer, M. Culver, S. VandeWoude, D. P. Martin, and A. Varsani. 2021. Complex evolutionary history of felid anelloviruses. Virology 562:176–189. https://doi.org/10.1016/j.virol.2021.07.013
Olson, L. E., N. Bjornlie, G. Hanvey, J. D. Holbrook, J. S. Ivan, S. Jackson, B. Kertson, T. King, M. Lucid, D. Murray, R. Naney, J. Rohrer, A. Scully, D. Thornton, Z. Walker, and J. R. Squires. 2021. Improved prediction of Canada lynx distribution through regional model transferability and data efficiency. Ecology and Evolution 11:1667–1690. https://doi.org/10.1002/ece3.7157
Squires, J. R., J. D. Holbrook, L. E. Olson, J. S. Ivan, R. W. Ghormley, and R. L. Lawrence. 2020. A specialized forest carnivore navigates landscape-level disturbance: Canada lynx in spruce-beetle impacted forests. Forest Ecology and Management 475:118400. https://doi.org/10.1016/j.foreco.2020.118400
Tabak, M. A., M. S. Norouzzadeh, D. W. Wolfson, E. J. Newton, R. K. Boughton, J. S. Ivan, E. A. Odell, E. S. Newkirk, R. Y. Conrey, J. Stenglein, F. Iannarilli, J. Erb, R. K. Brook, A. J. Davis, J. Lewis, D. P. Walsh, J. C. Beasley, K. C. VerCauteren, J. Clune, and R. S. Miller. 2020. Improving the accessibility and transferability of machine learning algorithms for identification of animals in camera trap images: MLWIC2. Ecology and Evolution 10:10374-10383. https://doi.org/10.1002/ece3.6692
Latif, Q. S., J. S. Ivan, A. E. Seglund, D. L. Pavlacky, and R. L. Truex. 2020. Avian relationships with bark beetle outbreaks and underlying mechanisms in lodgepole pine and spruce-fir forests of Colorado. Forest Ecology and Management 464:118043. https://doi.org/10.1016/j.foreco.2020.118043
Lukacs, P. M., D. Evans Mack, R. Inman, J. A. Gude, J. S. Ivan, R. P. Lanka, J. C. Lewis, R. A. Long, R. Sallabanks, Z. Walker, S. Courville, S. Jackson, R. Kahn, M. K. Schwartz, S. C. Torbit, J. S. Waller, and K. Carroll. 2020. Wolverine occupancy, spatial distribution, and monitoring design. The Journal of Wildlife Management 84:841–851. https://doi.org/10.1002/jwmg.21856
Zimova, M., A. P. Sirén, J. J. Nowak, A. M. Bryan, J. S. Ivan, T. L. Morelli, S. L. Suhrer, J. Whittington, and L. S. Mills. 2019. Local climate determines vulnerability to camouflage mismatch in snowshoe hares. Global Ecology and Biogeography 29:503–515.  https://doi.org/10.1111/geb.13049
Gigliotti, L. C., N. D. Berg, R. Boonstra, S. M. Cleveland, D. R. Diefenbach, E. M. Gese, J. S. Ivan, K. Kielland, C. J. Krebs, A. V. Kumar, L. S. Mills, J. N. Pauli, H. B. Underwood, E. C. Wilson, and M. J. Sheriff. 2019. Latitudinal variation in snowshoe hare (Lepus americanus) body mass: a test of Bergmann’s rule. Canadian Journal of Zoology 98:88–95. https://doi.org/10.1139/cjz-2019-0184
Squires, J. R., L. E. Olson, E. K. Roberts, J. S. Ivan, and M. Hebblewhite. 2019. Winter recreation and Canada lynx: reducing conflict through niche partitioning. Ecosphere 10:e02876. https://doi.org/10.1002/ecs2.2876
Ivan, J. S. 2019. Density estimation. Pages 20.1–20.19 in E. G. Cooch and G. C. White, editors. Program MARK - 'a gentle introduction'.
Ayers, C. R., K. C. Hanson-Dorr, K. Stromborg, T. W. Arnold, J. S. Ivan, and B. S. Dorr. 2019. Survival, fidelity, and dispersal of double-crested cormorants on two Lake Michigan Islands. The Auk 136:1-10. https://doi.org/10.1093/auk/ukz040​
Magee, P. A., J. D. Coop, and J. S. Ivan. 2019. Thinning alters avian occupancy in piñon–juniper woodlands. The Condor 121:1-17. https://doi.org/10.1093/condor/duy008
Tabak, M. A., M. S. Norouzzadeh, D. W. Wolfson, S. J. Sweeney, K. C. Vercauteren, N. P. Snow, J. M. Halseth, P. A. Di Salvo, J. S. Lewis, M. D. White, B. Teton, J. C. Beasley, P. E. Schlichting, R. K. Boughton, B. Wight, E. S. Newkirk, J. S. Ivan, E. A. Odell, R. K. Brook, P. M. Lukacs, A. K. Moeller, E. G. Mandeville, J. Clune, and R. S. Miller. 2018. Machine learning to classify animal species in camera trap images: applications in ecology. Methods in Ecology and Evolution 10:585–590.  https://doi.org/10.1111/2041-210X.13120 
Buderman, F. E., M. B. Hooten, M. W. Alldredge, E. M. Hanks, and J. S. Ivan. 2018. Time-varying predatory behavior is primary predictor of fine-scale movement of wildland-urban cougars. Movement Ecology 6:22. https://doi.org/10.1186/s40462-018-0140-6 
Ivan, J. S., A. E. Seglund, R. L. Truex, and E. S. Newkirk. 2018. Mammalian responses to changed forest conditions resulting from bark beetle outbreaks in the southern Rocky Mountains. Ecosphere 9:e02369. https://doi.org/10.1002/ecs2.2369
Olson, L. E., J. R. Squires, E. K. Roberts, J. S. Ivan, and M. Hebblewhite. 2018. Sharing the same slope: behavioral responses of a threatened mesocarnivore to motorized and nonmotorized winter recreation. Ecology and Evolution 8:8555-8572. https://doi.org/10.1002/ece3.4382 
Olson, L. E., J. R. Squires, E. K. Roberts, A. D. Miller, J. S. Ivan, and M. Hebblewhite. 2017. Modeling large-scale winter recreation terrain selection with implications for recreation management and wildlife. Applied Geography 86:66-91.  https://doi.org/10.1016/j.apgeog.2017.06.023
Buderman, F. E., M. B. Hooten, J. S. Ivan, and T. M. Shenk. 2018. Large-scale movement behavior in a reintroduced predator population. Ecography 41:126-139.  https://onlinelibrary.wiley.com/doi/ftr/10.1111/ecog.03030
Baigas, P. E., J. R. Squires, L. E. Olsen, J. S. Ivan, and E. K. Roberts. 2017. Using environmental features to model highway crossing behavior of Canada lynx in the Southern Rocky Mountains. Landscape and Urban Planning 157:200-213.  https://doi.org/10.1016/j.landurbplan.2016.06.007
Hooten, M. B., F. E. Buderman, B. M. Brost, E. M. Hanks, and J. S. Ivan. 2016. Hierarchical animal movement models for population-level inference. Environmetrics 27:322-333.  https://doi.org/10.1002/env.2402
Ivan, J. S., and T. M. Shenk. 2016. Winter diet and hunting success of Canada lynx in Colorado. The Journal of Wildlife Management 80:1049-1058. https://doi.org/10.1002/jwmg.21101
Ivan, J. S., and E. S. Newkirk. 2016. CPW Photo Warehouse: a custom database to facilitate archiving, identifying, summarizing, and managing photo data collected from camera traps. Methods in Ecology and Evolution 7:499-504. https://doi.org/10.1111/2041-210X.12503
Buderman, F. E., M. B. Hooten, J. S. Ivan, and T. M. Shenk. 2016. A functional model for characterizing long-distance movement behavior. Methods in Ecology and Evolution 7:264-273. https://doi.org/10.1111/2041-210X.12465
Ellis, M. M., J. S. Ivan, J. M. Tucker, and M. K. Schwartz. 2015. rSPACE: Spatially based power analysis for conservation and ecology. Methods in Ecology and Evolution 6:621-625. https://doi.org/10.1111/2041-210X.12369
Ivan, J. S., G. C. White, and T. M. Shenk. 2014. Density and demography of snowshoe hares in central Colorado. The Journal of Wildlife Management 78:580–594. https://doi.org/10.1002/jwmg.695
Gerber, B. D., J. S. Ivan, and K. P. Burnham. 2014. Estimating the abundance of rare and elusive carnivores from photographic-sampling data when the population size is very small. Population Ecology 56:463-470. https://doi.org/10.1007/s10144-014-0431-8
Trainor, A. M., O. J. Schmitz, J. S. Ivan, and T. M. Shenk. 2014. Enhancing species distribution modeling by characterizing predator–prey interactions. Ecological Applications 24:204–216. https://doi.org/10.1890/13-0336.1
Ellis, M. M., J. S. Ivan, and M. K. Schwartz. 2014. Spatially explicit power analyses for occupancy-based monitoring of wolverine in the U.S. Rocky Mountains. Conservation Biology 28:52–62. https://doi.org/10.1111/cobi.12139
Ivan J. S., G. C. White, and T. M. Shenk. 2013. Using simulation to compare methods for estimating density from capture-recapture data. Ecology 94:817–826. https://doi.org/10.1890/12-0102.1
Ivan, J. S., G. C. White, and T. M. Shenk. 2013. Using auxiliary telemetry information to estimate animal density from capture-recapture data. Ecology 94:809–816. https://doi.org/10.1890/12-0101.1
Stromborg, K. L., J. S. Ivan, J. K. Netto, and C. R. Courtney. 2012. Survivorship and mortality patterns of double-crested cormorants at Spider Island, Wisconsin, 1988–2006. Waterbirds 35:31–39. https://doi.org/10.1675/063.035.sp105
Education
Ph.D., Fish, Wildlife and Conservation Biology — Colorado State University, 2011
M.S., Wildlife Biology — University of Montana, 2000
B.S., Wildlife Science — Purdue University, 1997
Current or Recent Positions
Wildlife Researcher — Colorado Parks and Wildlife, 2010–Present
Refuge Biologist — U.S. Fish and Wildlife Service, 2003-2005
Piping Plover Recovery Biologist — The Nature Conservancy, 2000-2003
 [show more]                

ID: Jesse M. Lepak
Jesse M. Lepak
Type: 
Subjects: 
Item 

        Jesse M. Lepak    

                    Description:Aquatic Research Scientist Cool and Warmwater Lakes and ReservoirsContact Information

317 W Prospect Rd, Fort Collins, CO 80526Email:  target="_blank" rel="noopener">jesse.lepak@state.co.usPhone: 970-657-5820
Research Gate profile
CV
Education
Ph.D., Natural Resources (Concentrations: Fisheries, Natural Resource Policy and Management, Cellular and Molecular Medicine) — Cornell University, 2008
M.S., Natural Resources (Concentration: Fisheries) — Cornell University, 2004
B.S., Biology, Zoology, Biological Aspects of Conservation — University of Wisconsin-Madison, 2001
Current or Recent Positions
Aquatic Research Scientist – Colorado Parks and Wildlife, 2023-Current
Research Associate, Colorado State University Cooperative Fish and Wildlife Research Unit, 2022-2023
Aquatic Research Section Technician, Colorado Parks and Wildlife, 2021-2022
Great Lakes Fisheries and Ecosystem Health Specialist, New York Sea Grant, 2017-2020
Adjunct Biologist, Biodiversity Research Institute, 2016-present
Aquatic Research Scientist – Colorado Parks and Wildlife, 2010-2015
Affiliate Faculty Member, Dept of Fish, Wildlife, and Conservation Biology, 2011-2016
Areas of Interest/Expertise
I focus largely on the interactions between fish in lakes and reservoirs. I am primarily interested in sport fish and fisheries, but also consider native species within lake and reservoir systems. My areas of expertise include; contaminant cycling, bioenergetics, freshwater food webs, ecosystem dynamics, fish behavior and movement, fisheries management, fish immune systems and disease, aquatic nuisance species, aquaculture, biological control of invasive species, nutrient inputs and uptake, and sources of fish mortality. Combining these interests provides a better understanding of freshwater ecosystems to help protect, maintain, and enhance fisheries in Colorado.
Publications
In press: Lepak, J.M., Hansen, A.G., Johnson, B.M., Battige, K., Cristan, E.T., Farrell, C.J., Pate, W.M., Rogers, K.B., Treble, A.J., and Walsworth, T.E. Four decades of change: cyclical multi-trophic level responses to an introduced forage fish. Fisheries.
Lepak, J.M., Pate, W.M., Cadmus, P., Hansen, A.G., Gallaher, K.D., Silver, D.B. 2024. Response of an invasive aquatic crustacean to the fish toxicant rotenone. Lake and Reservoir Management 40(3):330-337
Hansen, A.G., J. M. Lepak, E. I. Gardunio, and T. Eyre. 2024. Evaluating harvest incentives for suppressing a socially-valued, but ecologically-detrimental, invasive fish predator. Fisheries Management and Ecology, 00, e12699.
Lepak, J. M., A. G. Hansen, E. T. Cristan, D. A. Williams, and W. M. Pate. 2023. Rainbow smelt (Osmerus mordax) influence on walleye (Sander vitreus) recruitment decline: mtDNA evidence supporting the predation hypothesis. Journal of Fish Biology 103(6):1543-1548.
Lepak, J. M., B. M. Johnson, M. B. Hooten, B. A. Wolff, and A. G. Hansen. 2023. Predicting sport fish mercury contamination in heavily managed reservoirs: Implications for human and ecological health. PLoS ONE 18(8): e0285890.
Hansen, A.G., Miller, M.W., Cristan, E.T., Farrell, C.J., Winkle, P., Brandt, M., Battige, K., and Lepak, J.M. 2023. Gill net catchability of walleye (Sander vitreus): are provincial standards suitable for estimating adult density outside the region? Fisheries Research. 266: 106800.
Cristan, E. T., A. G. Hansen, and J. M. Lepak. 2022. Effects of ethanol preservation on larval and juvenile walleye and gizzard shad body size. North American Journal of Fisheries Management 42:874-881.
Hansen, A. G., E. T. Cristan, M. M. Moll, E. I. Gardunio, and J. M. Lepak. 2022. Factors influencing early growth of juvenile tiger trout stocked into subalpine lakes as biocontrol and to enhance recreational angling. Fishes 7:342.
Lepak, J. M., A. G. Hansen, M. B. Hooten, D. Brauch, and E. M. Vigil. 2022. Rapid proliferation of the parasitic copepod, Salmincola californiensis (Dana), on kokanee salmon, Oncorhynchus nerka (Walbaum), in a large Colorado reservoir. Journal of Fish Diseases 45:89-98.Wolff, B.A., Johnson, B.M., and Lepak, J.M. 2017. Changes in sport fish mercury concentrations from food web shifts suggest partial decoupling from mercury loading in two Colorado reservoirs. Archives of Environmental Contamination and Toxicology. 72:167-177.
Kopack, C. J., E. D. Broder, E. R. Fetherman, J. M. Lepak, and L. M. Angeloni. 2016. The effect of a single prerelease exposure to conspecific alarm cue on poststocking survival in three strains of rainbow trout (Oncorhynchus mykiss). Canadian Journal of Zoology 94(9):661-664.
Lepak, J.M., Hooten, M.B., Eagles-Smith, C.A., Tate, M.T., Lutz, M.A., Ackerman, J.T., Willacker, J.J. Jr., Evers, D.C., Wiener, J.G., Flanagan Pritz, C., and Davis, J. 2016. Assessing potential health risks to fish and humans using mercury concentrations in inland fish from across western Canada and the United States. Science of the Total Environment. 571:342-354.
Eagles-Smith, C.A., Ackerman, J.T., Willacker, J.J., Tate, M.T., Lutz, M.A., Fleck, J., Stewart, A.R., Wiener, J.G., Evers, D.C., Lepak, J.M., Davis, J., and Flanagan Pritz, C. 2016. Spatial and temporal patterns of mercury concentrations in freshwater fishes across the Western US and Canada. Science of the Total Environment. 568:1171-1184.
Eagles-Smith, C.A., Wiener, J.G., Eckley, C, Willacker, J.J., Evers, D.C., Marvin-DiPasquale, M., Obrist, D., Fleck, J., Aiken, G., Lepak, J.M., Jackson, A.K., Webster, J., Stewart, A.R., Davis, J., Alpers, C., and Ackerman, J.T. 2016. Mercury in western North America: a synthesis of environmental contamination, fluxes, bioaccumulation and risk to fish and wildlife. Science of the Total Environment. 568:1213-1226.
Jackson, A., Evers, D.C., Eagles-Smith, C.A., Ackerman, J.T., Willacker, J.J., Elliott, J.T., Lepak, J.M., VanderPol, S.S., and Bryan, C.E. 2016. Mercury risk to avian piscivores across the western United States and Canada. Science of the Total Environment. 568:685-696.
Willacker, J.J., Eagles-Smith, C.A., Lutz, M.A., Tate, M.T., Ackerman, J.T, and Lepak, J.M. 2016. The influence of reservoirs and their water management on fish mercury concentrations in Western North America. Science of the Total Environment. 568:739-748.
Vigil, E., Christianson, K., Lepak, J.M., and Williams, P. 2016. Temperature effects on hatching and viability of juvenile gill lice; Salmincola californiensis. Journal of Fish Diseases. 39:899-905.
Fetherman, E. R., J. M. Lepak, B. L. Brown, and D. J. Harris. 2015. Optimizing time of initiation for triploid walleye production using pressure shock treatment. North American Journal of Aquaculture 77:471-477.
Kopack, C. J., E. D. Broder, J. M. Lepak, E. R. Fetherman, and L. M. Angeloni. 2015. Behavioral responses of a highly domesticated, predator naïve rainbow trout to chemical cues of predation. Fisheries Research 169:1-7.
Johnson, B.M., Lepak, J.M., and Wolff, B.A. 2015. Effects of prey assemblage on mercury bioaccumulation in a piscivorous sport fish. Science of the Total Environment. 506-507:330-337.
Hargis, L.N., Lepak, J.M., Vigil, E.M., and Gunn, C. 2014. Prevalence and intensity of the parasitic copepod (Salmincola californiensis) on kokanee salmon (Oncorhynchus nerka) in a Colorado reservoir. The Southwestern Naturalist. 59:126-129.
Pate, W.M., Johnson, B.M., Lepak, J.M., and Brauch, D. 2014. Management for coexistence of Kokanee and trophy Lake Trout in a montane reservoir. North American Journal of Fisheries Management. 34:908-922.
Lepak, J.M., Cathcart, C.N., and Stacy, W.L. 2014. Tiger muskellunge predation upon stocked sport fish intended for recreational fisheries. Lake and Reservoir Management. 30:250-257.
Fetherman, E.R., and Lepak, J.M. 2013. Addressing depletion failure and estimating gear efficiency using known population abundances. Fisheries Research. 147:284-289.
Lepak, J.M., Cathcart, C.N., and Hooten, M.B. 2012. Otolith weight as a predictor of age in kokanee salmon (Oncorhynchus nerka) from four Colorado reservoirs. Canadian Journal of Fisheries and Aquatic Sciences. 69:1569-1575.
Lepak, J.M., Hooten, M.B., and Johnson, B.M. 2012. The influence of external subsidies on diet, growth and Hg concentrations of freshwater sport fish: implications for fisheries management and the development of fish consumption advisories. Ecotoxicology. 21(7):1878-1888.
Stacy, W.L., and Lepak, J.M. 2012. Relative influence of prey mercury concentration, prey energy density and predator sex on sport fish mercury concentrations. Science of the Total Environment. 437:104-109.
Lepak, J.M., Fetherman, E.R., Pate, W.M., Craft, C.D. and Gardunio, E.I. 2012. An experimental approach to determine esocid prey preference in replicated pond systems.  Lake and Reservoir Management. 28:224-231.
Lepak, J.M., Kinzli, K.D., Fetherman, E.R., Pate, W.M., Hansen, A.G., Gardunio, E.I., Cathcart, C.N., Stacy, W.L., Underwood, Z.E., Brandt, M.M., Myrick, C.M., and Johnson, B.M.  2012. Manipulation of growth to reduce sport fish mercury concentrations on a whole-lake scale. Canadian Journal of Fisheries and Aquatic Sciences. 69(1):122-135.
Pate, W.M., Stacy, W.L., Gardunio, E.I., and Lepak, J.M. 2011. Collaborative research between current and future fisheries professionals: facilitating AFS subunit participation. Fisheries. 36(9):458-460.
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ID: Karen Hertel, Research Librarian
Karen Hertel, Research Librarian
Type: 
Subjects: 
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        Karen Hertel, Research Librarian    

                    Description:​​​​​​​Research Librarian​​
Current or Recent Research Projects
Maximizing access to CPW reports and other publications through cataloging, digitization, and collection management
Expanding access for CPW personnel to scholarly research resources 
Areas of Interest and Expertise​
In all the different libraries I've worked in, from elementary through academic, and now at CPW, a focus has been to help patrons access and use the best resources for their information need. Another area of interest is to continue to build and archive as complete a collection as possible of CPW publications, from the earliest days of the agency to the present. ​
​​Education
M.S., Library and Information Science — University of Washington, 1994
B.A., Spanish — University of Utah, 1984 
Current or Recent Positions
Research Librarian — Colorado Parks and Wildlife, 2022-Present
Ranch Manager - Ishawooa Mesa Ranch, 2010-2022
Ranch Manager - Dayton Creek Family Ranch, 2006-2010
Reference and Instruction Librarian - University of Idaho, 1998-2006 
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ID: Keeping Your Pets Safe Where Wolves are Present (flyer, 2021)
Keeping Your Pets Safe Where Wolves are Present (flyer, 2021)
Type: Text
Subjects: Gray wolf
Pets 
Human-wildlife ocnflict
Item 

        Keeping Your Pets Safe Where Wolves are Present (flyer, 2021)    
Type:Text
Subject:Gray wolf
Pets 
Human-wildlife ocnflict

                    Description:Information on keeping your pets safe at home and in the field.                

ID: Kelly Carlson
Kelly Carlson
Type: 
Subjects: 
Item 

        Kelly Carlson    

                    Description:Aquatic Research Program AssistantContact InformationColorado Parks and Wildlife317 West Prospect StreetFort Collins, CO 80526Phone: (970) 472-4320Fax: (970) 472-4457​​Email:  href="mailto:kelly.carlson@state.co.us%E2%80%8B%E2%80%8B%E2%80%8B">kelly.carlson@state.co.us​​​
EducationB.S., Fishery Biology — Colorado State University, 1999
Current or Recent PositionsProgram Assistant I — Colorado Parks and Wi​ldlife, 2014-Current​​
Areas of Interest/Expertise

Support the Aquatic Research Section's internal contracting, budgeting, accounting, and human resource procedures with regulatory and procedural compliance. [show more]                

ID: Kevin B. Rogers
Kevin B. Rogers
Type: 
Subjects: 
Item 

        Kevin B. Rogers    

                    Description:Aquatic Research Scientist Native Cutthroat TroutContact Information

Aquatic Research GroupColorado Parks and WildlifePO Box 775777         Steamboat Springs, CO  80477Phone: (970) 846-7145Email: kevin.rogers@state.co.usEducation
Ph.D., Fishery Science — Colorado State University, 1998
M.S., Fishery Science — Colorado State University, 1993
B.S., Biology — University of Colorado, 1988
B.S., Molecular Biology  — University of Colorado, 1988
Current or Recent Positions
Aquatic Research Scientist — Colorado Parks and Wildlife, 2003-Present
Aquatic Biologist — Colorado Parks and Wildlife, 2000-2003
Aquatic Technician — Colorado Parks and Wildlife, 1996-2000
Research Associate — Colorado Cooperative Fish and Wildlife Research, 1990-1996
Areas of Interest/Expertise
My primary research covers all aspects of cutthroat trout conservation and management but has been focused recently on developing the taxonomy of southern Rocky Mountain subspecies. In addition, I maintain ongoing projects dealing with hydroacoustics, mountain whitefish, northern pike, and tiger trout.
Current or Recent Research Projects
Cutthroat trout taxonomy – molecular and meristic investigations
Fitness in small populations - consequences of genetic bottlenecks
Adaptive capacity in cutthroat trout
Population viability
Mechanical removal of competing non-native salmonids
Cutthroat trout movement and habitat use in small streams
Methods to improve success of salmonid wild spawn operations
Hydroacoustic methods to estimate trout population and individual size
Software development
Temperature monitoring
Fishery data analysis 
Telemetry 
Hydroacoustic data
Bootstrapping
Select Publications
Rogers, K. B., J. R. Anderson, S. F. Brinkman and A. P. Martin. 2022. Inbreeding depression reduces fitness in Colorado’s last remaining Greenback Cutthroat Trout: consequences for management. Pages 185-194 in J. S. Gregory, editor. Proceedings of Wild Trout XIII Symposium: reducing the gap between science and public opinion. West Yellowstone, Montana. Herrmann, S. J., D. W. R. Nimmo, J. S. Carsella, I. V. Melnykov, C. M. Kennedy, K. B. Rogers, and L. M. Hermann-Hoesing. 2020. Differential bioaccumulation of mercury and selenium in stomach contents and tissues of three Colorado, USA, Cutthroat Trout populations. Bulletin of Environmental Contamination and Toxicology 104:595-601.Budy, P., K. B. Rogers, Y. Kanno, B. Penaluna, N. P. Hitt, G. P. Thiede, J. Dunham, C. Mellison, and W. L. Somer. 2019. Distribution and status of trouts and chars in North America. Pages 193-250 in J. L. Kershner, J. E. Williams, R. E. Gresswell, and J. Lobon-Cervia, editors. Trout and char of the world. American Fisheries Society, Bethesda, MarylandZeigler, M. P., K. B. Rogers, J. J. Roberts, A. S. Todd, and K. D. Fausch.  2019.  Predicting persistence of Rio Grande Cutthroat Trout populations in an uncertain future.  North American Journal of Fisheries Management 39:819-848.
Bestgen, K. R., K. B. Rogers, R. Granger.  2019.  Distinct phenotypes of native Cutthroat Trout emerge under a molecular model of lineage distributions.  Transactions of the American Fisheries Society 148:442-463
Herrmann, S, D. Nimmo, J. Carsella, C. Kennedy, K. B. Rogers, J. Wood, L. H. Hoesing, and B. V. Heuvel. 2018. Mercury and Selenium in twelve Cutthroat Trout tissues from high-elevation Colorado lakes (USA): Intraspecific and interspecific comparisons. Transactions of the American Fisheries Society 147:444-458.Rogers, K. B., K. R. Bestgen, S. M. Love Stowell, and A. P. Martin.  2018.  Cutthroat Trout diversity in the southern Rocky Mountains.  Pages 323-341 in P. Trotter, P. Bisson, B. Roper, and L. Schultz, editors.  Evolutionary biology and taxonomy of Cutthroat Trout (Oncorhynchus clarkii), American Fisheries Society Special Publication 36, Bethesda, Maryland.Hodge, B., K. Battige, and K. B. Rogers. 2017. Seasonal and temperature-related movement of Colorado River cutthroat trout in a low-elevation, Rocky Mountain stream. Ecology and Evolution 7:2346–2356.Hodge, B. W., E. R. Fetherman, K. B. Rogers, and R. Henderson. 2017. Effectiveness of a fishway for restoring passage of Colorado River cutthroat trout. North American Journal of Fisheries Management 37(6):1332-1340.Penaluna, B. E. A. Abadía-Cardoso, J. B. Dunham, F. J. García-Dé León, R. E. Gresswell, A.Ruiz Luna, E. B. Taylor, B. B. Shepard, R. Al-Chokhachy, C. C. Muhlfeld, K. R. Bestgen, K. B. Rogers, M. A. Escalante, E. R. Keeley, G. M. Temple, J. E. Williams, K. R. Matthews, R. Pierce, R. L. Mayden, R. P. Kovach, J. C. Garza, and K. D. Fausch. 2016. Conservation of native Pacific trout diversity in western North America. Fisheries 41:286-300.Hodge, B. W., R. Henderson, K. B. Rogers, and K. Battige. 2015. Efficacy of portable PIT detectors for tracking long-term movement of Colorado River Cutthroat Trout in a small montane stream. North American Journal of Fisheries Management 35:605-610.Rogers, K. B., K. R. Bestgen, and J. Epp. 2015. Using genetic diversity to inform conservation efforts for native Cutthroat Trout of the southern Rocky Mountains. Pages 218-228 in Carline, R.F., and C. LoSapio, editors.  Proceedings of the Wild Trout XI symposium, Bozeman, Montana.  
Brinkman, S. F., H. J. Crockett, and K. B. Rogers.  2013.  Upper thermal tolerance of mountain whitefish (Prosopium williamsoni) eggs and fry.  Transactions of the American Fisheries Society 142:824-831.
Metcalf, J. L., S. L. Stowell, C. M. Kennedy, K. B. Rogers, J. Epp, K. Keepers, A. Cooper, J. J. Austin, A. P. Martin. 2012. Historical stocking data and 19th century DNA reveal human-induced changes to native diversity and distribution of cutthroat trout. Molecular Ecology 21:5194-5207.
Underwood, Z. E., C. A. Myrick, and K. B. Rogers. 2012. Effect of acclimation temperature and the upper thermal tolerance of Colorado River cutthroat trout Oncorhynchus clarkii pleuriticus. Journal of Fish Biology 80:2420-2433.
Rogers, K. B. 2010. Cutthroat trout taxonomy: exploring the heritage of Colorado's state fish. Carline, R. F., and C. LoSapio, editors. Conserving wild trout. Proceedings of the Wild Trout X Symposium, Bozeman, Montana. Available online at www.wildtroutsymposium.com
Rogers, K. B., and G. C. White. 2007. Analysis of movement and habitat use from telemetry data. M. Brown and C. Guy, editors. Analysis and interpretation of freshwater fisheries data. American Fisheries Society, Bethesda, Maryland.Recent Reports
Rogers, K. B., J. White, and M. Japhet.  2018.  Rediscovery of a lost Cutthroat Trout lineage in the San Juan Mountains of southwest Colorado.  Colorado Parks and Wildlife report, Steamboat Springs.
Rogers, K. B.  2015.  User manual for WaTSS 3.0 (Water temperature summary software).  Colorado Parks and Wildlife, Steamboat Springs, Colorado.
Bestgen, K, R., K. B. Rogers, and R. Granger.  2013.  Phenotype predicts genotype for lineages of native cutthroat trout in the southern Rocky Mountains.  Final Report to U. S. Fish and Wildlife Service, Colorado Field Office, Denver Federal Center (MS 65412), Denver, CO. Larval Fish Laboratory Contribution 177.
Rogers, K. B.  2012. Piecing together the past: using DNA to resolve the heritage of our state fish. Colorado Outdoors 61(5):28-32
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ID: Keystone structures maintain forest function for Canada lynx after large-scale spruce beetle outbreak
Keystone structures maintain forest function for Canada lynx after large-scale spruce beetle outbreak
Type: Article
Subjects: Bhattacharyya’s affinity overlap
Canada lynx
Forest disturbance
Keystone structures
Item 

        Keystone structures maintain forest function for Canada lynx after large-scale spruce beetle outbreak    
Type:Article
Subject:Bhattacharyya’s affinity overlap
Canada lynx
Forest disturbance
Keystone structures

                    Description:Central to species conservation in an era of increased disturbance from climate change is understanding the primary mechanisms that facilitate how forest-dependent species respond to changes in forest structure and composition. Here, we leveraged a natural experiment to investigate how changed forest structure and function pre-spruce-beetle (Dendroctonus rufipennis) and post-beetle disturbance influenced the regional distribution of Canada lynx (Lynx canadensis) at their southern range periphery. We compared the distribution of Canada lynx that were reintroduced into Colorado, USA from 1999–2006 to the current (2015–2017) distribution following a spatial large-scale spruce beetle outbreak from 2007 to 2016. Canada lynx did not substantially alter their distribution following the wide-spread alteration of forest structure and composition following the insect outbreak. We used the Bhattacharyya’s affinity metric to document that core (50% isopleth) and overall population ranges (95% isopleth) overlapped significantly at 50% and 77% respectively. In addition, areas of low and high relative use remained similar after the bark beetle outbreak and mapped onto one another in nearly a 1:1 fashion (Spearman rank correlation = 0.92, p < 0.01). The low impact of forest change on distribution was due to the keystone habitat elements (high horizontal forest cover, snowshoe hares) that remained functional. Thus, our results highlight that conservation scientists should increase their focus to understand the underlying mechanisms that impact wildlife distributions as climate-related disturbances becomes ever more amplified. [show more]                

ID: Known positive waters for ANS in Colorado
Known positive waters for ANS in Colorado
Type: Text
Subjects: Aquatic nuisance species
ANS
Item 

        Known positive waters for ANS in Colorado    
Type:Text
Subject:Aquatic nuisance species
ANS

                    Description:Definition from the ANS Act (SB08-226): "AQUATIC NUISANCE SPECIES" MEANS EXOTIC OR NONNATIVE AQUATIC WILDLIFE OR ANY PLANT SPECIES THAT HAVE BEEN DETERMINED BY THE BOARD TO POSE A SIGNIFICANT THREAT TO THE AQUATIC RESOURCES OR WATER INFRASTRUCTURE OF THE STATE.” [show more]                