Cole A. Bleke's research while affiliated with Utah State University and other places

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Publications (7)

Figure 2. Mean and standard deviation of seasonal fecal glucocorticoid...
Figure 3. Cont.
Figure 3. Fecal glucocorticoid metabolite (fGCM) levels for female...
Matrix of results from a Tukey's multiple comparison test following a...
Changes in Fecal Glucocorticoid Metabolites in Captive Coyotes (Canis latrans): Influence of Gender, Time, and Reproductive Status
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  • Nov 2023
Reproduction is considered an energetically and physiologically demanding time in the life of an animal. Changes in physiological stress are partly reflected in changes in glucocorticoid metabolites and can be measured from fecal samples. We examined levels of fecal glucocorticoid metabolites (fGCMs) in 24 captive coyotes (Canis latrans) to investi...
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Population growth rates of pronghorn: influence of temporally and spatially explicit conditions, density dependence, and scale
Article
  • Nov 2023
Density-independent and density-dependent population regulation has long been a subject of investigation. We examined density-dependent and density-independent factors on growth rates of pronghorn (Antilocapra americana (Ord, 1815)) using a retrospective analysis of population survey data. Across Idaho, we found as the proportion of the subpopulati...
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Spatially and temporally explicit environmental drivers of fawn recruitment in a native ungulate
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  • Oct 2023
Recruitment is one of the fundamental drivers of ungulate population dynamics. Recruitment of neonates into an ungulate population can be influenced by a wide range of abiotic, biotic, and anthropogenic factors. Our objective was to examine which environmental variables most influenced pronghorn ( Antilocapra americana ) fawn recruitment, as measur...
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Fig 1. Pronghorn antelope summer distributions. Ranges of the five...
Fig 2. Dietary functional group composition of pronghorn antelope...
Fig 3. Temporal genera-based plant detections in pronghorn antelope...
Fig 4. Protein intake by plant functional group across sampling periods...
Seasonal shifts in pronghorn antelope (Antilocapra americana) diets under a new lens: Examining diet composition using a molecular technique
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  • Oct 2023
Foraging is one of the most fundamental activities contributing to the maximization of an animal’s fitness, and thus herbivores must optimize their diet selection and intake to meet their nutrient demands for survival, growth, and reproduction. Using plant DNA barcoding, we determined diet composition of five subpopulations of adult female pronghor...
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Short-term impact of a wildfire on the homeostasis of Tropidurus oreadicus lizards
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  • Feb 2023
Wildfires cause significant changes in natural habitats and can impact lizard populations. Through changes in the thermal environment, reduced prey availability, and increased exposure to parasite vectors, wildfires affect lizard physiology, immunity, and health. We sampled 56 Tropidurus oreadicus lizards from Cerrado savannas of Brazil living in t...
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Variations, Validations, Degradations, And Noninvasive Determination of Pregnancy Using Fecal Steroid Metabolites in Free-ranging Pronghorn
Article
  • Jul 2021
Pregnancy status is a key parameter used to assess reproductive performance of a species as it represents a starting point for measuring vital rates. Vital rates allow managers to determine trends in populations such as neonate survival and recruitment; two important factors in ungulate population growth rates. Techniques to determine pregnancy hav...
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Distribution of Competition Potential Between Native Ungulates and Free‐Roaming Equids on Western Rangelands
Article
  • Feb 2021
Free‐roaming equids (i.e., feral horses [Equus caballus] and burros [Equus asinus]) are widely distributed and locally abundant across the rangelands of the western United States. The 1971 Wild Free Roaming Horse and Burro Act (WFRHBA) gave the Bureau of Land Management (BLM) and United States Forest Service (USFS) the legal authority to manage the...
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Citations

... Since the reduction in pronghorn populations, Idaho has yet to see pronghorn numbers return to pre-control levels (Rachael et al. 2010). Gese et al. (2023) found that at mountain valley sites, survival of pronghorn fawns through the summer was reliant upon the quality of vegetation the lactating female was exposed to. Fawn recruitment at lower elevation sites was driven by several environmental conditions (i.e., normalized difference vegetation index (NDVI), drought severity, minimum and maximum temperatures, forb, and grass cover) during late gestation that would affect fawn birth weights and subsequent fawn survival. ...
Reference: Population growth rates of pronghorn: influence of temporally and spatially explicit conditions, density dependence, and scale
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... Our vegetation production metrics were heavily influenced by shrub cover, which may be problematic for our study species because horse diet mainly consists of graminoids while pronghorn can consume a large proportion of forbs, especially during the growing season (Bleke et al., 2023;McInnis & Vavra, 1987;Scasta et al., 2016). Although our analytical approach should correlate with growing season of herbaceous materials, it may not adequately represent forage to the ungulates in question (Esmaeili et al., 2021). ...
Reference: Feral horses and pronghorn: a test of the forage maturation hypothesis in an arid shrubland
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... We measured steroid hormones using enzyme-linked immunosorbent assay kits (ELISA, Enzo Life Sciences, Inc., Farmingdale, New York, NY, USA) using the manufacturer's protocol for cortisol and optimized for coyotes, followed by assay methodologies for species validation [42]. The cortisol ELISA is based on competitive binding between mouse monoclonal antibodies and plasma hormone that occurs on a goat anti-mouse immunoglobulin microtiter plate. ...
Reference: Changes in Fecal Glucocorticoid Metabolites in Captive Coyotes (Canis latrans): Influence of Gender, Time, and Reproductive Status
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... Linking demography data (sex, age) with spatiotemporal variables can help forecast and classify populations based on current structure, as well as current and future landscape conditions (Arnold et al. 2018). Pronghorn are considered to have ecological and economic value across their range and therefore, State and Provincial agencies are responsible for setting pronghorn harvest rates (Jakes 2021;Stoner et al. 2021). Demography data combined with population estimates form the foundation for which decisions on pronghorn harvest levels are made by wildlife managers. ...
Reference: Chapter 19: Pronghorn
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