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Proceeding

Incorporating Experimental Design in Education on Managing Human-Wildlife Conflicts at Colorado State University

Knowledge about how to design research experiments is important when evaluating the extent of damage caused by wildlife, the effectiveness of damage management interventions, as well as evaluating if the design, conclusions, and inferences of research conducted by others is appropriate. I emphasize experimental design in FW565: Managing Human-Wildlife Conflicts, a 3 credit senior/graduate level class that I teach at Colorado State University. I provide a 1-hour lecture on the basics of experimental design. I then provide an example of an elk (Cervus elaphus) repellent experiment and request students to indicate what were the treatments, dependent variables, etc. The students then independently write a 1-page manuscript on designing an experiment that evaluates the effectiveness of 1 of 2 wildlife damage management techniques. We follow with an on-site field trip to discuss and critique the students\u27 experimental designs. Then, students are requested to write a 3-page manuscript and give a 6 to 8 minute presentation on designing an experiment that evaluates a new and unique method for reducing conflicts with wildlife in Colorado. Although we emphasize quantitative skills in our undergraduate program, a fair amount of repetition is required for students to grasp experimental design

DO LIVESTOCK GUARDING DOGS LOSE THEIR EFFECTIVENESS OVER TIME?

Information about the effectiveness of livestock guarding dogs for reducing coyote predation on sheep was gathered from livestock producers in the Animal Damage Control Livestock Guarding Dog Program and in Colorado. Eighty-two percent of the producers contacted reported that the performance of their dogs remained the same or improved during 1993 compared with previous years. Eighteen percent of the producers reported a decrease in their dog\u27s effectiveness, but most still felt the dogs were a benefit to their livestock operation. Most producers who noted a decrease in effectiveness attributed it to an apparent increase in the number of coyotes and/or an increase in their predatory activities on livestock

Island Fox Spatial Ecology and Implications for Management of Disease

Disease, predation, and genetic isolation resulted in 4 of 6 island fox (Urocyon littoralis) subspecies being listed as endangered in 2004. Potential for disease outbreaks continues to pose a major threat to the persistence of these isolated, endemic populations. We examined how roads influence the spatial ecology of San Clemente Island foxes (U. l. clementae), particularly in regard to spread of disease, to provide management recommendations for preventing or minimizing a disease outbreak on San Clemente Island, California, USA. Home range areas (x=0.75 km2) and core areas (x=0.19 km2) of foxes on San Clemente Island were 0.36–1.23 and 2.17 times larger, respectively, than estimates from Santa Cruz Island foxes (U. l. santacruzae). Home ranges and core areas were 78% larger and 73% larger, respectively, for foxes near roads than for foxes away from roads. Home ranges were also largest when foxes were not caring for offspring (i.e., seasons of pup-independence and breeding). We did not detect any dispersal movements, but foxes living near roads moved 33% farther in 2-hour periods than foxes not living near roads. Foxes near roads move faster, range more widely, and could more rapidly spread a pathogen throughout the island; therefore, roads might serve as transmission corridors.We recommend reducing this risk by increasing widths of vaccination firewalls (areas where vaccination is used to induce a disease-resistant or immune population of foxes), ensuring these areas deliberately intersect roads, and vaccinating a higher proportion of foxes living near roads. Disease risk models incorporating these strategies could inform the lowest risk scenarios

Evaluation of an Electronic Device for Reducing Damage by Pileated Woodpeckers to Wooden Utility Poles

Woodpecker damage to utility poles results in significant economic losses to utility companies. Pileated woodpeckers (Dryocopus pileatus), one of the largest woodpeckers in North America, can severely damage utility poles. Many types of repellent techniques have been evaluated for managing pileated woodpecker damage to utility poles. However, each technique has short-comings including cost, difficulty of installation, longevity of the product, or defeat by the woodpeckers. The Sonic Dissuader, a deterrent device, has shown some promise in field testing. We further evaluated the effectiveness of the device for deterring pileated woodpeckers from damaging utility poles in controlled flight pens at the National Wildlife Research Center, Fort Collins, Colorado. Birds spent similar time (F1.7 = 0.00, P = 0.9621) on poles with Sonic Dissuaders (6956.3 ± 1421.4 sec), and poles with the control device (8358.6 ± 1004.2 sec). Woodpeckers spent less time pecking on poles with the Sonic Dissuader (385.9 ± 69.1 sec) compared to control poles (1877.6 ± 494.2 sec) although the difference was not significant (F1.7 = 1.40, P = 0.2751). Weight of woodchips removed did not vary (t = -0.89, df= 14, P = 0.3887) between poles equipped with the Sonic Dissuader (54.7 ± 21.3 g) and poles equipped with the control device (101.0 ± 47.4 g), but weight of woodchips removed varied considerably by bird. We were also unable to detect a difference among times to departure after the 7 types of calls were emitted by the Sonic Dissuader (F6.8 = 1.14, P = 0.4216). Efficacy of the Sonic Dissuader might be improved by programming to broadcast whenever pecking occurs and by utilizing calls or sounds which have been evaluated for deterring woodpeckers from utility poles

Adaptive divergence despite strong genetic drift: genomic analysis of the evolutionary mechanisms causing genetic differentiation in the island fox (\u3ci\u3eUrocyon littoralis\u3c/i\u3e)

The evolutionary mechanisms generating the tremendous biodiversity of islands have long fascinated evolutionary biologists. Genetic drift and divergent selection are pre- dicted to be strong on islands and both could drive population divergence and specia- tion. Alternatively, strong genetic drift may preclude adaptation. We conducted a genomic analysis to test the roles of genetic drift and divergent selection in causing genetic differentiation among populations of the island fox (Urocyon littoralis). This species consists of six subspecies, each of which occupies a different California Chan- nel Island. Analysis of 5293 SNP loci generated using Restriction-site Associated DNA (RAD) sequencing found support for genetic drift as the dominant evolutionary mech- anism driving population divergence among island fox populations. In particular, pop- ulations had exceptionally low genetic variation, small Ne (range = 2.1–89.7; median = 19.4), and significant genetic signatures of bottlenecks. Moreover, islands with the lowest genetic variation (and, by inference, the strongest historical genetic drift) were most genetically differentiated from mainland grey foxes, and vice versa, indicating genetic drift drives genome-wide divergence. Nonetheless, outlier tests identified 3.6–6.6% of loci as high FST outliers, suggesting that despite strong genetic drift, divergent selection contributes to population divergence. Patterns of similarity among populations based on high FST outliers mirrored patterns based on morphology, providing additional evidence that outliers reflect adaptive divergence. Extremely low genetic variation and small Ne in some island fox populations, particularly on San Nicolas Island, suggest that they may be vulnerable to fixation of deleterious alleles, decreased fitness and reduced adaptive potential

WILDLIFE DAMAGE CONTROL PROGRAM NEEDS OF COUNTY EXTENSION AGENTS IN COLORADO

County extension agents in Colorado indicated that extension bulletins were the most important type of assistance needed for their clientele in the area of wildlife damage control. County extension agents indicated that pocket gophers, prairie dogs, skunks, and coyotes were the most important of 32 species requiring extension information for their clientele

Table of Contents

Proceeding

LIVESTOCK GUARDING DOGS PROTECT DOMESTIC SHEEP FROM COYOTE PREDATION IN KANSAS

Sheep (Ovis cries/ producers were surveyed in Kansas to determine the efficacy of livestock guarding dogs (Canis familiaris) for protecting sheep from coyote (Canis latrans) predation. The majority of producers rated their guard dogs\u27 predator control performance as good or excellent, indicating. that the dogs reduced their reliance on other control methods and substantially reduced monetary losses