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ID: Survival, fidelity, and dispersal of Double-crested Cormorants on two Lake Michigan islands
Survival, fidelity, and dispersal of Double-crested Cormorants on two Lake Michigan islands
Type: Article
Subjects: Colonial waterbird
Dispersal
Fidelity
Lake Michigan
Multistate model
Phalacrocorax auritus
Survival
Temporary emigration
Item
view first image of Survival, fidelity, and dispersal of Double-crested Cormorants on two Lake Michigan islands
Survival, fidelity, and dispersal of Double-crested Cormorants on two Lake Michigan islands
Type:Article
Subject:Colonial waterbird
Dispersal
Fidelity
Lake Michigan
Multistate model
Phalacrocorax auritus
Survival
Temporary emigration
Description:Colony fidelity and dispersal can have important consequences on the population dynamics of colonial-nesting birds. We studied survival and inter-colony movements of Double-crested Cormorants (Phalacrocorax auritus; cormorants) nesting at Spider and Pilot islands, located 9 km apart in western Lake Michigan, during 2008–2014. We used live resighting and dead recovery data from both colonies, plus dead recoveries from throughout North America, in a multistate live and dead encounter model to estimate annual survival, inter-colony movements, plus temporary and permanent emigration to unmonitored sites. Annual survival averaged 0.37 (annual process variation, σ⌢=0.07σ⌢=0.07⁠) for hatch-year, 0.78 (⁠σ⌢=0.08σ⌢=0.08 ) for second-year, and 0.89 (⁠σ⌢=0.04σ⌢=0.04 ) for after-second year birds. The best approximating model recognized only 2 age classes for transition probabilities, indicating little difference in fidelity and movement probabilities after the natal year. Annual fidelity to Spider and Pilot islands averaged 0.53 (⁠σ⌢=0.17σ⌢=0.17 ) and 0.48 (⁠σ⌢=0.24σ⌢=0.24⁠) for second-year and 0.55 (⁠σ⌢=0.23σ⌢=0.23 ) and 0.62 (⁠σ⌢=0.16σ⌢=0.16 ) for after-second year cormorants, respectively, indicating substantial emigration for both age classes. For birds that dispersed, emigration was approximately equally divided among neighboring colonies, temporary emigration sites from which surviving birds subsequently returned, or permanent emigration sites from which birds never returned (but were still encountered through dead recoveries). Our results indicate that Double-crested Cormorants in the Great Lakes have tremendous potential to disperse, which may help to explain their rapid recolonization following historically low populations in the early 1970s.La fidélité à la colonie et la dispersion peuvent avoir des conséquences importantes sur la dynamique des populations d’oiseaux coloniaux. Nous avons étudié la survie et les déplacements inter-colonies de Phalacrocorax auritus (cormorans) nichant sur les îles Spider et Pilot, situées à 9 km l’une de l’autre dans la partie ouest du lac Michigan, en 2008–2014. Nous avons utilisé des données de réobservations d’individus vivants et de récupération d’individus morts des deux colonies, en plus des récupérations d’individus morts provenant de l’ensemble de l’Amérique du Nord, dans un modèle multi-états de rencontres d’individus vivants et morts afin d’estimer la survie annuelle, les déplacements inter-colonies, de même que l’émigration temporaire et permanente vers les sites non suivis. La survie annuelle atteignait en moyenne 0,7 (variation annuelle, σ⌢=0,7σ⌢=0,7 ) pour les jeunes de l’année (HY), 0,8 (⁠σ⌢=0,8σ⌢=0,8 ) pour les jeunes de deuxième année (SY) et 0,9 (⁠σ⌢=0,4σ⌢=0,4 ) pour les oiseaux de plus de deux ans (ASY). Le meilleur modèle d’approximation reconnaissait seulement deux classes d’âge pour les probabilités de transition, indiquant peu de différences dans la fidélité et les probabilités de déplacement après l’année de naissance. La fidélité annuelle envers les îles Spider et Pilot était en moyenne de 0,3 (⁠σ⌢=0,7σ⌢=0,7 ) et 0,8 (⁠σ⌢=0,4σ⌢=0,4 ) pour les SY et 0,5 (⁠σ⌢=0,3σ⌢=0,3 ) et 0,2 (⁠σ⌢=0,6σ⌢=0,6 ) pour les cormorans ASY, respectivement, indiquant une émigration substantielle pour les deux classes d’âge. Pour les oiseaux qui se sont dispersés, l’émigration était approximativement divisée de façon égale entre les colonies voisines, les sites d’émigration temporaires vers lesquels les oiseaux survivants retournaient subséquemment, ou les sites d’émigration permanents où les oiseaux ne sont jamais retournés (mais étaient encore rencontrés via les oiseaux morts retrouvés). Nos résultats indiquent que P. aursitus dans les Grands Lacs possède un potentiel de dispersion considérable, ce qui peut contribuer à expliquer la recolonisation rapide après les niveaux de population historiquement bas au début des années 1970. [show more]
ID: Survivorship and mortality patterns of double-crested cormorants at Spider Island, Wisconsin, 1988–2006
Survivorship and mortality patterns of double-crested cormorants at Spider Island, Wisconsin, 1988–2006
Type: Article
Subjects: Bird banding
Double-crested Cormorant
Lake Michigan
Mark-recapture
Mortality
Survival
Item
view first image of Survivorship and mortality patterns of double-crested cormorants at Spider Island, Wisconsin, 1988–2006
Survivorship and mortality patterns of double-crested cormorants at Spider Island, Wisconsin, 1988–2006
Type:Article
Subject:Bird banding
Double-crested Cormorant
Lake Michigan
Mark-recapture
Mortality
Survival
Description:Banding records were examined to identify changes in mortality causes and locations of Double-crested Cormorants (Phalacrocorax auritus) in Door County, Wisconsin. In 14 out of 18 years between 1988 and 2005, a total of 22,469 birds were banded (300 to 5,462; average 1,605 per active banding year). Of 649 usable band returns (36.1 ± 5.4 per year), 33% were banding-year recoveries (before 1 May of the first year of life). The yearly rate of banding-year recoveries increased from 0.7% per year before 1996 to 2.2% per year after 1999. The yearly proportion of all band recoveries attributed to animal damage control operations also increased over time. The yearly proportion of band returns from Mississippi Delta states increased over time. Mortality rates, both natural and anthropogenic, of cormorants from these colonies appear to have risen as the population has grown and control activities in southern states have increased. Apparent survival rates were estimated by mark-recapture methods during 2001 to 2006. Birds color-banded as adults had a model-averaged annual survival rate of 0.696. For birds banded as nestlings, the model-averaged survival rates were: 0.305 (first year), 0.774 (second and third year), and 0.633 (adults). Simulations of these measured survival rates combined with previously estimated reproductive rates demonstrated that emigration and immigration rates complicate interpretation of these results. Also, simulations demonstrate the potential efficacy of reproductive controls in reducing local breeding populations. [show more]
ID: Swift Fox Conservation Team Annual and Biennial Reports (1995- present)
Swift Fox Conservation Team Annual and Biennial Reports (1995- present)
Type: Text
Subjects:
Item
view first image of Swift Fox Conservation Team Annual and Biennial Reports (1995- present)
Swift Fox Conservation Team Annual and Biennial Reports (1995- present)
Type:Text
ID: Swift Fox Conservation Team Newsletters (occasional, 1997-2016)
Swift Fox Conservation Team Newsletters (occasional, 1997-2016)
Type: Text
Subjects:
Item
view first image of Swift Fox Conservation Team Newsletters (occasional, 1997-2016)
Swift Fox Conservation Team Newsletters (occasional, 1997-2016)
Type:Text
ID: Swift Fox Conservation Team: Agency / Partner Documents
Swift Fox Conservation Team: Agency / Partner Documents
Type: Text
Subjects:
Item
view first image of Swift Fox Conservation Team: Agency / Partner Documents
Swift Fox Conservation Team: Agency / Partner Documents
Type:Text
ID: Tawni B. Firestone
Tawni B. Firestone
Type:
Subjects:
Item
view first image of Tawni B. Firestone
Tawni B. Firestone
Description:Aquatic Research Scientist Toxicology and Disease

Contact Information

200 S Spruce St., Gunnison, CO 81230Email:  href="mailto:adam.hansen@state.co.us">tawni.firestone@state.co.usPhone: 970-666-0912

Education

  • Ph.D. Fish, Wildlife, and Conservation Biology - Colorado State University 2022
  • B.S. Biology - University of Wisconsin-Oshkosh 2013

Current or Recent Positions

  • Aquatic Research Scientist - Colorado Parks and Wildlife 2023 - Present
  • Toxicology Postdoctoral Researcher - Colorado Parks and Wildlife 2022-2023
  • Graduate Research Assistant - Colorado State University, Colorado Cooperative Fish and Wildlife Research Unit 2018-2022
  • Fish Pathology Technician - Colorado Parks and Wildlife 2015-2018

Current or Recent Research Projects

  • Application Methods to Apply EarthTec QZ as an Attempt to Eradicate Zebra Mussels from Highline Lake
  • Assessing Water Quality Impacts on Genetic Recruitment of Native Suckers in the Gunnison River
  • Effects of Road Salts on Cutthroat Trout
  • Effects of copper, chloride, and chlorine on drift and chemical avoidance of benthic macroinvertebrates and salmonids
  • Establishing Temperature Tolerance Ranges for Native Fish Species through Electrocardiogram Analysis
  • Field-based Temperature Standards for Bluehead Sucker (Catostomus discobolus), Flannelmouth Sucker (Catostomus latipinnis), and Roundtail Chub (Gila robusta)
  • Leveraging detection uncertainty to estimate Renibacterium salmoninarum infection status among multiple tissues and assays
  • Non-lethal detection of Renibacterium salmoninarum in Cutthroat Trout Oncorhynchus clarkii comparing mucus, blood, and ovarian fluid samples to kidney tissues
  • Pathogenesis of Renibacterium salmoninarum in Chinook Salmon following intraperitoneal injection: Description of disease progression using qPCR and histopathology
  • Temperature tolerance of Flannelmouth sucker larvae
  • Temperature tolerance of Bluehead sucker larvae
  • The importance of a nuanced approach to developing aquatic species-specific temperature standards: A review

Areas of Interest/Expertise

I study complex interactions between aquatic wildlife and their environments by conducting research on biological and physiological mechanisms to better understand how various pollutants, toxicants, temperature, or disease affect aquatic organisms.

Publications

Riepe, T. B., Z. E. Hooley-Underwood, and M. Johnson. 2024. Thermal tolerance of larval flannelmouth sucker Catostomus latipinnis acclimated to three temperatures. Fishes 9(5):181.Riepe, T. B., Z. E. Hooley-Underwood, R. E. McDevitt, A. Sralik, and P. Cadmus. 2023. Increased density of Bluehead Sucker larvae decreases critical thermal maximum. North American Journal of Fisheries Management. 43(4):1135-1142.Riepe T. B., E. R. Fetherman, B. Neuschwanger, T. Davis, A. Perkins, and D. L. Winkelman. 2023. Vertical transmission of Renibacterium salmoninarum in Cutthroat Trout (Oncorhynchus clarkii). Journal of Fish Diseases 46(4):303-319.Riepe, T. B., B. W. Avila, and D. L. Winkelman. 2022. Effects of 17⍺-ethinylestradiol and density on juvenile fathead minnow survival and body size. Journal of Aquatic Pollution and Toxicology 6:60.Kowalski, D. A., R. J. Cordes, T. B. Riepe, J. D. Drennan, and A. J. Treble. 2022. Prevalence and distribution of Renibacterium salmoninarum, the causative agent of bacterial kidney disease, in wild trout fisheries in Colorado. Diseases of Aquatic Organisms 149:109-120.Riepe, T. B., V. Vincent, V. Milano, E. R. Fetherman, and D. L. Winkelman 2021. Evidence for the use of mucus swabs to detect Renibacterium salmoninarum in Brook Trout Pathogens 10(4):460.Johnson P. T. J., D. M. Calhoun, W. E. Moss, T. McDevitt-Galles, T. B. Riepe, J. Dallas, T. Parchman, C. Feldman, J. Cropanzo, J. Bowerman, and J. Koprivnikar. 2020. The cost of travel: how dispersal ability limits local adaption in host-parasite interactions. Journal of Evolutionary Biology 34(3):512-524.Johnson P. T. J., D. M. Calhoun, T. B. Riepe, T. McDevitt-Galles, and J. Koprivnikar. 2019. Community disassembly and disease: realistic - but not randomized - biodiversity losses inhibit parasite transmission. Proceedings of the Royal Society B 286(1902).Riepe T. B., D. M. Calhoun, and P. T. J. Johnson. 2019. Comparison of direct and indirect techniques to detect intestinal parasites in newts (Salamandridae Taricha). Diseases of Aquatic Organisms 134:137–146.Johnson P. T. J., D. M. Calhoun, T. B. Riepe, and J. Koprivnikar. 2019. Chance or choice? Understanding selection by parasites in multi-host communities. International Journal for Parasitology 49:407–415.Calhoun D. M., L. K. Leslie, T. B. Riepe, T. J. Achatz, T. McDevitt-Galles, V. V. Tkach, and P. T. J. Johnson. 2019. Patterns of Clinostomum spp. infection in fishes and amphibians: integration of field, genetic, and experimental approaches. Journal of Helminthology94:1–12.Koprivnikar J., T. B. Riepe, D. M. Calhoun, and P. T. J. Johnson. 2018. Whether larval amphibians school does not affect the parasite aggregation rule: testing the effects of host spatial heterogeneity in field and experimental studies. Oikos 127:99–110. [show more]
ID: Tech Pub cover photo
Tech Pub cover photo
Type:
Subjects:
Item
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Tech Pub cover photo
ID: Temporal variation and scale in movement-based resource selection functions
Temporal variation and scale in movement-based resource selection functions
Type: Article
Subjects: Animal movement
Kullback–Leibler
Telemetry data
Item
view first image of Temporal variation and scale in movement-based resource selection functions
Temporal variation and scale in movement-based resource selection functions
Type:Article
Subject:Animal movement
Kullback–Leibler
Telemetry data
Description:A common population characteristic of interest in animal ecology studies pertains to the selection of resources. That is, given the resources available to animals, what do they ultimately choose to use? A variety of statistical approaches have been employed to examine this question and each has advantages and disadvantages with respect to the form of available data and the properties of estimators given model assumptions. A wealth of high resolution telemetry data are now being collected to study animal population movement and space use and these data present both challenges and opportunities for statistical inference. We summarize traditional methods for resource selection and then describe several extensions to deal with measurement uncertainty and an explicit movement process that exists in studies involving high-resolution telemetry data. Our approach uses a correlated random walk movement model to obtain temporally varying use and availability distributions that are employed in a weighted distribution context to estimate selection coefficients. The temporally varying coefficients are then weighted by their contribution to selection and combined to provide inference at the population level. The result is an intuitive and accessible statistical procedure that uses readily available software and is computationally feasible for large datasets. These methods are demonstrated using data collected as part of a large-scale mountain lion monitoring study in Colorado, USA. [show more]
ID: Testing Fish Marking Methods to Assess Stocking Success
Testing Fish Marking Methods to Assess Stocking Success
Type:
Subjects:
Item
view first image of Testing Fish Marking Methods to Assess Stocking Success<br />
Testing Fish Marking Methods to Assess Stocking Success
Description:

Led By

J​esse Lepak​

Study Area

Eastern Slope

Project Status

Completed

Research Objectives

  • To test fish marking methods as a way to assess stocking success.

Project Description

Researchers can utilize fish marking as a way to determine fish growth, movement, survival, reproduction and more. This information, in turn, can be used to assess stocking success.

Therefore, CPW initiated a research project to investigate fish marking techniques. These techniques wi​ll be used to assess walleye fry (recently hatched fish) versus fingerling (juvenile fish) success after stocking[L1] .

Researchers tested oxytetracycline as a possible marking method. A type of antibiotic, oxytetracycline turns fluorescent green-yellow under a particular wavelength of light. To mark fish, researchers submerge them into an oxytetracycline solution; the fish then incorporate the oxytetracycline into their hard parts (e.g., bones).  This can later be viewed in the lab after the fish is captured again in the wild after stocking.

Based on the results of this project, researchers determined oxytetracycline as an effective marking technique. This technique will be applied by biologists to monitor walleye fry and fingerling stocking success and survival.

 [show more]
ID: The cascading effects of human food on hibernation and cellular aging in free-ranging black bears
The cascading effects of human food on hibernation and cellular aging in free-ranging black bears
Type: Article
Subjects: Adaptations
Senescence
Demography
Hibernation
Aging

Bears
Food
Item
view first image of The cascading effects of human food on hibernation and cellular aging in free-ranging black bears
The cascading effects of human food on hibernation and cellular aging in free-ranging black bears
Type:Article
Subject:Adaptations
Senescence
Demography
Hibernation
Aging

Bears
Food
Description:Human foods have become a pervasive subsidy in many landscapes, and can dramatically alter wildlife behavior, physiology, and demography. While such subsidies can enhance wildlife condition, they can also result in unintended negative consequences on individuals and populations. Seasonal hibernators possess a remarkable suite of adaptations that increase survival and longevity in the face of resource and energetic limitations. Recent work has suggested hibernation may also slow the process of senescence, or cellular aging. We investigated how use of human foods influences hibernation, and subsequently cellular aging, in a large-bodied hibernator, black bears (Ursus americanus). We quantified relative telomere length, a molecular marker for cellular age, and compared lengths in adult female bears longitudinally sampled over multiple seasons. We found that bears that foraged more on human foods hibernated for shorter periods of time. Furthermore, bears that hibernated for shorter periods of time experienced accelerated telomere attrition. Together these results suggest that although hibernation may ameliorate cellular aging, foraging on human food subsidies could counteract this process by shortening hibernation. Our findings highlight how human food subsidies can indirectly influence changes in aging at the molecular level. [show more]