Browsing by Author "Sovell, John, author"
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Item Open Access A conservation blueprint for neotropical migratory birds in western Colorado(Colorado State University. Libraries, 2007) Fink, Michelle, author; Hanni, David, author; Klute, David, author; Sovell, John, author; Rondeau, Renée Jane, author; Colorado Natural Heritage Program, publisherItem Open Access A natural heritage assessment: San Miguel and western Montrose counties, Colorado(Colorado State University. Libraries, 2000) Lyon, Peggy, author; Sovell, John, author; Colorado Natural Heritage Program, publisherItem Open Access Amphibian and reptile survey report and management plan for Buckley AFB, Colorado(Colorado State University. Libraries, 2011-05-20) Sovell, John, author; Colorado Natural Heritage Program, publisherItem Open Access Assessment of conservation targets, viability, and impacts to biological diversity on the Lowry Range(Colorado State University. Libraries, 2006-06-20) Grunau, Lee, author; Sovell, John, author; Rondeau, Renée Jane, author; Colorado Natural Heritage Program, publisherItem Open Access Baca Grande biological assessment, 2005(Colorado State University. Libraries, 2006) Sovell, John, author; Colorado Natural Heritage Program, publisherItem Open Access Black-tailed prairie dog surveys in Crowley, Otero, Pueblo and eastern Huerfano counties, Colorado: a report to the Bureau of Land Management, Canon City Office(Colorado State University. Libraries, 2003-01) Sovell, John, author; Colorado Natural Heritage Program, publisherItem Open Access Black-tailed prairie dog surveys of BLM lands in eastern Colorado: a report to the Bureau of Land Management, Canon City Office(Colorado State University. Libraries, 2004-03) Assal, Timothy J., author; Sovell, John, author; Colorado Natural Heritage Program, publisherItem Open Access Grasshopper monitoring on Pueblo Chemical Depot (2001-2003)(Colorado State University. Libraries, 2006-05) Sovell, John, author; Colorado Natural Heritage Program, publisherItem Open Access Identification and assessment of important wetlands within the North Platte River Watershed(Colorado State University. Libraries, 2010) Culver, Denise R., author; Decker, Karin, author; Sovell, John, author; Bell, Jodie, author; Huggins, Janis, author; Parker, Jessica, author; Colorado Natural Heritage Program, publisherItem Open Access Lepidoptera of North America 19. Pawnee montane skipper Hesperia leonardus montana Skinner (Lepidoptera: Hesperiidae): habitat requirements, distribution and abundance, population responses to forest thinning and wildfire, and genetic investigations(Colorado State University. Libraries, 2023) Ellis, Scott, author; Sovell, John, author; Painter, Mikele, author; Drummond, Boyce A., editor; C.P. Gillette Museum of Arthropod Diversity, publisherThis Contribution summarizes field studies conducted between 1985 and 2021 on the habitat and biology of the federally listed Pawnee montane skipper butterfly (Hesperia leonardus montana Skinner) and its population responses to forest thinning treatments and large wildfires within the same time frame. Other smaller studies and genetic information are also summarized. H. l. montana (Hlm) occupies a total known range of less than 80 square miles within the South Platte River drainage southwest of Denver, Colorado. Habitat consists of xeric conifer woodland dominated by an overstory of ponderosa pine (Pinus ponderosa), an understory of blue grama grass (Bouteloua gracilis), which is the larval foodplant, and dotted gayfeather (Liatris punctata), the primary adult nectar source. Peak adult Hlm densities during late August to early September generally ranged from 1 to 4 individuals per acre. Based on Hlm densities measured in 1986 belt transects, August abundance estimates ranged from 77,000 to 141,000 individuals within suitable habitat. If the Two Forks Reservoir were built, approximately 21 percent of Hlm suitable habitat would be inundated, and from 23 to 42 percent of the Hlm population would be lost, inferred from the 1986 skipper density measurements. The overall pattern of adult Hlm annual densities at the Trumbull forest thinning transects is interpreted as recovery from the 2001-2002 drought through 2007. Then density varied from year to year in response to both above and below average annual precipitation and temperature, but a general trend of increasing population size through 2021. Forest thinning treatments that were implemented at Trumbull from 2000 through 2004 are compatible with the continued survival of the skipper. A tree thinning pattern that preserves a conifer canopy cover of approximately 30 percent and 100 trees (5 inches or greater in diameter) per acre appears optimum for maintenance of Hlm habitat. Post-Hayman fire Hlm monitoring in moderately to intensively burned areas documents slow population recovery over time. Monitoring indicates that Hlm occurrence is negatively associated with standing dead trees, which may mean that intensively burned areas will remain sparsely inhabited over the long term. This avoidance behavior means that crown fires that kill all mature conifers represent a significant risk to the suitable habitat extent for this species. Genetic samples from Hlm and congeners were analyzed to investigate species and subspecies relationships and determine Hlm population substructure. Analysis of cytochrome c oxidase subunit I (COI) showed H. leonardus haplotypes are distinct from other Hesperia species, but it was not possible to distinguish H. leonardus subspecies from one another based on the observed COI haplotypes. Population structure analysis of Hlm samples using single nucleotide polymorphism (SNP) genotyping revealed gene flow throughout the range of Hlm, but clusters of more related individuals were distinguishable along a geographic gradient from north to south. Two individuals collected 4 miles south of the 1986 study area were noticeably different in the SNP analysis. The area includes remnants of ponderosa pine forest with blue grama and dotted gayfeather that survived the Hayman Fire. More investigation is needed to determine if this finding indicates an isolated subpopulation.Item Open Access Lowry Range biological survey: 2005(Colorado State University. Libraries, 2006) Sovell, John, author; Grunau, Lee, author; Menefee, Michael, author; Doyle, Georgia, author; Rondeau, Renée Jane, author; Colorado Natural Heritage Program, publisherItem Open Access Lowry Range biological survey: 2010 update(Colorado State University. Libraries, 2011) Sovell, John, author; Rondeau, Renée Jane, author; Colorado Natural Heritage Program, publisherItem Open Access Montane mollusk and crustacean survey of western Colorado: 2003 annual report: a report to the Colorado Division of Wildlife(Colorado State University. Libraries, 2004) Sovell, John, author; Guralnick, Rob, author; Colorado Natural Heritage Program, publisherItem Open Access Pawnee montane skipper monitoring study for the Upper South Platte Watershed Protection and Restoration project, August 2017(Colorado State University. Libraries, 2018-05) Sovell, John, author; Colorado Natural Heritage Program, publisherIn 2000, the U.S. Forest Service (USFS), in cooperation with the Colorado State Forest Service, Denver Water, and other entities, implemented a program of forest thinning treatments to reduce the risk of large fires that could occur where surface fuels have accumulated and dense forest stands have resulted from past fire management activities. To assist in evaluating project effects over the short- and long-term, the USFS and Denver Water sponsored a pilot Hesperia skipper monitoring program for the federally threatened Pawnee montane skipper (PMS) (Hesperia leonardus montana), to evaluate the relative use by skippers of treated and untreated areas. Annual monitoring began in August 2000; this report discusses results of the most recent years monitoring in relation to all previous years.Item Open Access Pawnee montane skipper post-fire habitat assessment survey, August/September 2009(Colorado State University. Libraries, 2010-03) Sovell, John, author; Colorado Natural Heritage Program, publisherItem Open Access Pawnee montane skipper post-fire habitat assessment survey, September 2005: draft(Colorado State University. Libraries, 2006-03) Sovell, John, author; Drummond, Boyce, author; Colorado Natural Heritage Program, publisherItem Open Access Pawnee montane skipper post-fire habitat assessment survey, September 2006(Colorado State University. Libraries, 2006) Sovell, John, author; Colorado Natural Heritage Program, publisherItem Open Access Population parameters and fat composition of small mammals on Pueblo Chemical Depot (2000-2003)(Colorado State University. Libraries, 2004-04) Sovell, John, author; Wunder, Bruce A., author; Lukacs, Paul M., author; Gionfriddo, James P., author; Siemers, Jeremy L., author; Colorado Natural Heritage Program, publisherItem Open Access Potential habitat for Mountain Plovers on Colorado Springs Utilities property(Colorado State University. Libraries, 2003-01) Margulies, Martin, author; Sovell, John, author; Colorado Natural Heritage Program, publisherItem Open Access Pueblo Chemical Depot grasshopper monitoring, 1999 results(Colorado State University. Libraries, 1999) Sovell, John, author; Colorado Natural Heritage Program, publisher