Global ETD Search
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Showing 1 to 7 of 7 for “"visual encounter surveys"”.
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An Assessment of Visual Encounter Surveys for an Elusive Species: The Dunes Sagebrush Lizard (Sceloporus arenicolus)
… The standard method for detecting the DSL, visual encounter surveys (VES), was utilized to estimate the probability of detection, across sites that had varying degrees of reported suitability. Three separate VES methodologies were analyzed: 1) plot size: 200m x 200m; survey duration: 15 …
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Occupancy of Stream-Associated Amphibians within the Interstate 90 Snoqualmie Pass Corridor
Detection of stream-associated amphibians in visual encounter surveys is challenging due to their cryptic nature; however, occupancy models were developed to deal with these detectability problems and provide estimates of occupancy that can also be related to site characteristics. Highway crossing …
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Assemblages of salamanders (Family Plethodontidae) in CWA 305(b) fully-supporting, partially-supporting, and non-supporting streams on Walden's Ridge, Tennessee
… a non-destructive manner using coverboards and visual encounter surveys from April 2002 to October 2002. Wilcoxon's Signed Ranks Tests indicated that there was a significant difference in the abundance of plethodontid salamanders in the fully-supporting stream when compared to both the …
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Utilization of Stormwater Retention Ponds by Aquatic Turtles in Montgomery County, Virginia
… of turtle assemblages. I used a combination of visual and trapping surveys to characterize turtle assemblages. I also surveyed design and management variables to identify those conditions that promote use of stormwater ponds by turtles. Visual encounter surveys involving eight or more visits …
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Impacts of Driving Factors on Annual Cicada Emergence in Relation to the Seasonal Abundance of Eastern Copperheads (Agkistrodon contortrix)
… movement and cicada emergence. Nightly visual encounter surveys were conducted to determine copperhead and cicada relative abundances while observing behavioral interactions. Climatic data and environmental factors were collected during each survey or through the Midwestern Regional …
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Assessing the Impacts of Agricultural Land Use on Wood Frog (Lithobates sylvaticus) Presence and Health in Central Saskatchewan
… compared to traditional survey methods – visual encounter surveys and dipnetting. However, for both wood frogs and ranavirus, detection varied seasonally with greater success in the summer than in the spring. Several environmental variables influenced wood frog presence, the most …
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Characterizing the epidemiology of ophidiomycosis in North American snakes through field studies, modeling, pathogen genomic analysis, and treatment trials
… Counties, Ohio, USA. Snakes were captured during visual encounter surveys and visually inspected for skin lesions suggestive of ophidiomycosis, then a body swab was collected to detect the presence of O. ophidiicola using qPCR. Each snake was assigned to an ophidiomycosis category based on the …