561 items found

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ID: Development of landscape scale resource selection models using interpolated layers from micro-scale vegetation measurements in North Park, Colorado
Development of landscape scale resource selection models using interpolated layers from micro-scale vegetation measurements in North Park, Colorado
Type: Text
Subjects: Wildlife management
Wildlife habitat improvement
Item 

        Development of landscape scale resource selection models using interpolated layers from micro-scale vegetation measurements in North Park, Colorado    
Type:Text
Subject:Wildlife management
Wildlife habitat improvement

                    Description:State agencies have long used micro-scale vegetation measurements to assess relationships between species and how they chose their habitat. Often species select small scale habitat based on vegetation structure, the height and density of certain vegetation, and the availability of forage species. With the onset of remote sensing and the ability to predict species’ distributions based on relatively easy and inexpensive methods, micro-scale measurements have had reduced value when describing a species’ habitat selection. There is also the problem of how to translate micro-scale measurements at a small scale to landscape level resource selection models. There is a long history of using interpolation methods to predict vegetation characteristics across space, but these predictive surfaces have rarely been applied to spatial models of species habitat. [show more]                

ID: Differential impacts of spruce beetle outbreaks on snowshoe hares and red squirrels in the southern Rocky Mountains
Differential impacts of spruce beetle outbreaks on snowshoe hares and red squirrels in the southern Rocky Mountains
Type: Article
Subjects: Colorado
<em>Dendroctonus rufipennis</em>
Density
<em>Lepus americanus</em>
<em>Tamiasciurus hudsonicus</em>
Spruce beetle
Snowshoe hare
American red squirrel
Distance sampling
Item 

        Differential impacts of spruce beetle outbreaks on snowshoe hares and red squirrels in the southern Rocky Mountains    
Type:Article
Subject:Colorado
<em>Dendroctonus rufipennis</em>
Density
<em>Lepus americanus</em>
<em>Tamiasciurus hudsonicus</em>
Spruce beetle
Snowshoe hare
American red squirrel
Distance sampling

                    Description:Spruce beetles (Dendroctonus rufipennis) have impacted millions of acres of Engelmann spruce (Picea engelmannii) – subalpine fir (Abies lasiocarpa) forest in North America over the past decade, resulting in the most extensive outbreak in recorded history. This dramatic alteration of forest composition and structure has precipitated numerous changes to forest ecology and ecosystem services. Among the least studied of these changes are impacts to wild mammals, including snowshoe hares (Lepus americanus) and red squirrels (Tamiasciurus hudsonicus). We sampled a chronosequence of spruce-fir stands along a gradient of ‘years elapsed since spruce beetle outbreak’ (YSO) in order to estimate impacts to abundance of these two species in the southern Rocky Mountains. Snowshoe hare abundance was not related to YSO, at least in the first decade post-outbreak. Instead, hare abundance during this period was positively related to horizontal cover, especially that due to stem density of small diameter subalpine fir. Notably, snowshoe hare abundance was negatively related to stem density of small diameter Engelmann spruce, suggesting that elements of horizontal cover may not be uniformly beneficial to hares. Hare abundance was also negatively related to ground cover, which could help explain the lack of relationship to YSO, assuming reduction in overstory canopy would lead to increases in ground cover. Red squirrel abundance was negatively related to YSO and outbreak severity (i.e., basal area of large diameter dead trees). This was likely due to diminished cone crops in impacted areas, which red squirrels cache and rely on heavily to sustain them through the winter. Basal area of remaining large live fir trees was not related to squirrel abundance, suggesting that regeneration of spruce and associated cone crops may be necessary for recovery of red squirrels, which may take several decades. [show more]                

ID: Diseases at Feeders
Diseases at Feeders
Type: Fact Sheet
Subjects: Birds -- Diseases
Bird feeders
Salmonella infections
Trichomoniasis
Conjunctivitis
Trichomoniasis
Item 

        Diseases at Feeders    
Type:Fact Sheet
Subject:Birds -- Diseases
Bird feeders
Salmonella infections
Trichomoniasis
Conjunctivitis
Trichomoniasis

                    Description:Fact sheet: Many diseases are spread at bird feeders including salmonellosis, trichomoniasis, finch conjunctivitis, avian pox, and others.                

ID: Div report 4 cover
Div report 4 cover
Type: 
Subjects: 
Item 

        Div report 4 cover    

                                    

ID: Diverse university students across the United States reveal promising pathways to hunter recruitment and retention
Diverse university students across the United States reveal promising pathways to hunter recruitment and retention
Type: Article
Subjects: Decision-making
Forest landowners
Behavior change model
Landowner behavior
Item 

        Diverse university students across the United States reveal promising pathways to hunter recruitment and retention    
Type:Article
Subject:Decision-making
Forest landowners
Behavior change model
Landowner behavior

                    Description:Declining participation in hunting, especially among young adult hunters, affects the ability of state and federal agencies to achieve goals for wildlife management and decreases revenue for conservation. For wildlife agencies hoping to engage diverse audiences in hunter recruitment, retention, and reactivation (R3) efforts, university settings provide unique advantages: they contain millions of young adults who are developmentally primed to explore new activities, and they cultivate a social atmosphere where new identities can flourish. From 2018 to 2020, we surveyed 17,203 undergraduate students at public universities across 22 states in the United States to explore R3 potential on college campuses and assess key demographic, social, and cognitive correlates of past and intended future hunting behavior. After weighting to account for demographic differences between our sample and the larger student population, 29% of students across all states had hunted in the past. Students with previous hunting experience were likely to be white, male, from rural areas or hunting families, and pursuing degrees related to natural resources. When we grouped students into 1 of 4 categories with respect to hunting (i.e., non-hunters [50%], potential hunters [22%], active hunters [26%], and lapsed hunters [3%]), comparisons revealed differences based on demographic attributes, beliefs, attitudes, and behaviors. Compared to active hunters, potential hunters were more likely to be females or racial and ethnic minorities, and less likely to experience social support for hunting. Potential hunters valued game meat and altruistic reasons for hunting, but they faced unique constraints due to lack of hunting knowledge and skills. Findings provide insights for marketing and programming designed to achieve R3 objectives with a focus on university students. [show more]                

ID: Does a population of cougars exist in Michigan?
Does a population of cougars exist in Michigan?
Type: Article
Subjects: Cougar
Michigan
DNA
Distribution
Item 

        Does a population of cougars exist in Michigan?    
Type:Article
Subject:Cougar
Michigan
DNA
Distribution

                    Description:After analyzing DNA obtained from fecal samples gathered in Michigan,  href="https://bioone.org/journals/the-american-midland-naturalist/volume-158/issue-2/0003-0031(2007)158%5B467%3ADAPOCE%5D2.0.CO%3B2/Does-a-Population-of-Cougars-Exist-in-Michigan/10.1674/0003-0031(2007)158%5B467:DAPOCE%5D2.0.CO;2.short#i0003-0031-158-2-467-Swanson1">Swanson and Rusz (2006) claimed that 83% of identified scats were from cougars, indicating to them that a population of these large carnivores existed in the state. In this paper, we identify problems with their methodology, suggest that they unreasonably extrapolated their conclusions and point out that their results are improbable, especially in light of no other evidence in the scientific literature suggesting the existence of a population of cougars in Michigan. [show more]                

ID: Dr. George J. Schisler
Dr. George J. Schisler
Type: 
Subjects: 
Item 

        Dr. George J. Schisler    

                    Description:Aquatic Research Section LeaderContact Information

Colorado Parks and Wildlife317 West Prospect StreetFort Collins, CO 80526Phone: (970) 472-4361Fax: (970) 472-4457Email:  href="mailto:george.schisler@state.co.us">george.schisler@state.co.us
Google Scholar Profile​
ResearchGate Profile​
Education
Ph.D., Fishery and Wildlife Biology — Colorado State University, 1999
M.S., Fishery and Wildlife Biology — Colorado State University, 1995
B.S., Biology and Fishery Science — University of Alaska, 1992
Current or Recent Positions
Aquatic Research Chief — Colorado Parks and Wildlife, 2011-Present
Aquatic Research Scientist — Colorado Parks and Wildlife, 2001-2011
Post-Doctorate Fellow — Colorado State University, 1999-2000
Research Associate — Colorado Cooperative Fish and Wildlife Research Unit, 1993-1999
Current or Recent Research Projects
Directs statewide aquatic research activities involving all aspects of native and non-native aquatic wildlife. Supervises a staff of 14 research scientists, hatchery technicians, and support staff. Ongoing research studies include evaluations of various strains of whirling disease resistant rainbow trout for hatchery production re-establishment in the wild.   
Areas of Interest/Expertise
My research interest areas include salmonid reproduction and strain selection, salmonid disease studies, the economic impacts of fisheries in Colorado, and angler creel and mail-in surveys. 
Publications
Erickson, T.A., G.J. Schisler, and E.R. Fetherman. 2023. Poststocking survival and myxospore evaluation of whirling disease‐resistant rainbow trout strains. North American Journal of Fisheries Management. 43(2):586-599.
Americus, B., G. J. Schisler,  J.L. Bartholomew, and S.D. Atkinson. 2021. Myxobolus cerebralis causes presporogonic mortality in juvenile mountain whitefish. Journal of Aquatic Animal Health. 33(2):116-122.

Nehring, G. J. Schisler, L. Chiaramonte, A. Horton, and B. Poole. 2016. Accelerated deactivation of Myxobolus cerebralis myxospores by susceptible and non-susceptible Tubifex tubifex. Diseases of Aquatic Organisms. 121(1):37-47.
Purdy, P., E.A. Barbosa, C. J. Praamsma, and G. J. Schisler. 2016. Modification of trout sperm membranes associated with activation and cryopreservation. Implications for fertilizing potential. Cryobiology 73(1):73-79.
Nehring, R. B., G. Schisler, L. Chiaramonte, A. Horton, and B. Poole. 2015. Assessment of the long-term viability of the myxospores of Myxobolus cerebralis as determined by production of the actinospores by Tubifex tubifex. Journal of Aquatic Animal Health. 27(1):50-56.
​Fetherman, E. R., D. L. Winkelman, L. L. Bailey, G. J. Schisler, and K. Davies. 2015. Brown trout removal effects on short-term survival and movement of Myxobolus cerebralis-resistant rainbow trout. Transactions of the American Fisheries Society. 144:610-626.
Fetherman, E. R., D. L. Winkelman, M. R. Baerwald, and G. J. Schisler. 2014. Survival and reproduction of Myxobolus cerebralis resistant rainbow trout in the Colorado River and increased survival of age-0 progeny. PLoS ONE. 9(5):e96954.
​Fetherman, E.R., D. L. Winkelman, G. J. Schisler, and M. F. Antolin. 2012. Genetic basis of differences in myxospore count between whirling disease-resistant and –susceptible strains of rainbow trout. Diseases of Aquatic Organisms. 102:97-106.
Baerwald, M. R., Petersen, J. L., Hedrick, R. P., Schisler, G. J., and B. May. 2011. A major effect quantitative trait locus for whirling disease resistance identified in rainbow trout Oncorhynchus mykiss. Heredity. 106:920-926.
Fetherman, E. R., D. L. Winkelman, G. J. Schisler, and C. A. Myrick. 2011. The effects of Myxobolus cerebralis on the physiological performance of whirling disease resistant and susceptible strains of rainbow trout. Journal of Aquatic Animal Health. 23:169-177.
Schisler, G. J., N. K. M. Vieira, and P. G. Walker. 2008. Application of Household Disinfectants to Control New Zealand Mudsnails. North American Journal of Fisheries Management. 28:1172–1176.
Schisler, G. J., K. A. Myklebust, and R. P. Hedrick. 2006. Inheritance of Myxobolus cerebralis resistance among F1-generation crosses of whirling disease resistant and susceptible rainbow trout strains. Journal of Aquatic Animal Health. 18:109–115.
Schisler, G. J., and E. P. Bergersen. 2002. Evaluation of risk of high elevation Colorado waters to the establishment of Myxobolus cerebralis​. Pages 33-41 in J. L. Bartholomew and J. C. Wilson, editors. Whirling disease: reviews and current topics. American Fisheries Society, Symposium 29, Bethesda, Maryland.
Schisler, G. J., E. P. Bergersen, P. G. Walker, J. Wood, and J. K. Epp. 2001. C​omparison of single-round polymerase chain reaction (PCR) and pepsin-trypsin digest (PTD) methods for detection of Myxobolus cerebralis. Diseases of Aquatic Organisms. 45:109-114.
Schisler, G. J. and E. P. Bergersen. 2000. Effects of multiple stressors on morbidity and mortality of fingerling rainbow trout infected with Myxobolus cerebralis. Transactions of the American Fisheries Society. 129:859-865.
Schisler, G. J., E. P. Bergersen, and P. G. Walker. 1999. Evaluation of chronic gas supersaturation on growth, morbidity, and mortality of fingerling rainbow trout infected with Myxobolus cerebralis. North American Journal of Aquaculture. 61:175- 183.
Schisler, G. J., P. G. Walker, L. A. Chittum, and E. P. Bergersen. 1999. Gill ectoparasites of juvenile rainbow trout in the Upper Colorado River. Journal of Aquatic Animal Health. 11:170-174.
 [show more]                

ID: Draft proposed Upper Colorado River Headwaters project monitoring plan
Draft proposed Upper Colorado River Headwaters project monitoring plan
Type: Text
Subjects: Upper Colorado River Headwaters
Habitat restoration
Item 

        Draft proposed Upper Colorado River Headwaters project monitoring plan    
Type:Text
Subject:Upper Colorado River Headwaters
Habitat restoration

                    Description:In December 2016, a group of partners including American Rivers, Colorado Parks and Wildlife (CPW), Colorado River Water Conservation District (CRWCD), Colorado Water Conservation Board (CWCB), Denver Water, Grand County, Irrigators of Lands in the Vicinity of Kremmling (ILVK), Municipal Subdistrict of Northern Colorado Water Conservancy District (Northern Water), Trout Unlimited, and the Upper Colorado River Alliance was awarded $7.75 million by the U.S. Department of Agriculture Natural Resources Conservation Service (NRCS) through their Regional Conservation Partnership Program (RCPP) for the Upper Colorado River Headwaters Project (Headwaters Project). The Headwaters Project is comprised of three endeavors within Grand County that will collectively restore fish and wildlife habitat, and improve water quality and agricultural water management on a regional scale. The RCPP funding will be utilized to focus on two specific project components: 1) reconnecting the Colorado River upstream and downstream of Windy Gap Reservoir (referenced as the Windy Gap Connectivity Channel Project); and 2) restoration of the Colorado River channel to be resilient to hydrological modifications, while sustaining agriculture, and aquatic and riparian habitat (referenced as the Irrigators of Lands in the Vicinity of Kremmling Project). The third endeavor, the Kemp Breeze State Wildlife Area (SWA) Habitat Restoration Project, is expected to be funded by the partners, and other interested parties. These three project components are further described in the following sections. [show more]                

ID: Draw recap glossary
Draw recap glossary 
Type: Text
Subjects: Hunting
Item 

        Draw recap glossary     
Type:Text
Subject:Hunting

                    Description:Prior to 2015, draw statistics were primarily designed for internal use by CPW staff to validate the draws and to manage hunting. However, hunters use the same information, so we make this data available to Colorado’s hunters.

Redesign of the Draw Recap information combines pre-draw and post-draw information in an easy to read layout. Each report has a summary page which summarizes all applications and hunts in that draw and detail pages which summarize draw information for each quota. The report is broken out into zones to help organize the information. This color coded glossary explains each zone including descriptions and possible values for each field. [show more]                

ID: Draw recap walkthrough
Draw recap walkthrough
Type: Text
Subjects: Hunting
Item 

        Draw recap walkthrough    
Type:Text
Subject:Hunting

                    Description:THIS IS A DIGITAL WALKTHROUGH SAMPLE REPORT Hover the cursor over any field in this report for information regarding that field.                