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- W2246942789 abstract "When 100X and 200X microscope magnification levels were used singly and interchangeably in microhistological analysis, magnification level had no effect (K.05) on diet botanical composition of 60% grass and 60% forb diets containing 6 forage species fed to mule deer. However, hrrge differences occurred between magnification levels for individual plant species in a 60% shrub diet containing the same forage species. The use of the 100X and 200X magnification levels interchangeably was slightly more accurate than exclusive use of either magnification level for the high grass and high shrub diets. For fecal analysis our study shows 100X and 200X microscope magnification levels can be used singly or interchangeably with little influence on accuracy. Use of the 100X magnification level to scan fields for potentially identifiable fragments followed by switching to 200X magnification for better resolution of fragments difftcult to discern can slightly improve both speed and accuracy. Fourwing saltbush, which had a high proportion of stemmy material relntive to leaves, was severely underestimated in the feces of all 3 diets. Our data indicate fecal analysis has limited value as an estimator of diets of herbivores, such as mule deer, that consume significant but variable quantities of stemmy material from shrubs. Fecal analysis has become one of the most widely used tools to evaluate the botanical composition of wild herbivore diets. While degree of magnification in fecal analysis studies has consistently been 100X or 125X, higher levels of magnification might improve the accuracy of fecal analysis. Fecal analysis may have severe limitations for estimating diets of herbivores consuming varying quantities of woody material during the year (Zyznar and Urness 1969, Westoby et al. 1976). The objectives of this research were to determine the similarity between actual mule deer diets and fecal samples when the 100X and 200X microscope magnification levels were used singly and interchangeably for estimating the botanical composition of fecal samples. Because the 3 diets used in this study contained different levels of shrub stemmy material, its influence on fecal analysis accuracy could be evaluated. Methods" @default.
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- W2246942789 date "1985-07-01" @default.
- W2246942789 modified "2023-10-10" @default.
- W2246942789 title "Magnification and Shrub Stemmy Material Influences on Fecal Analysis Accuracy" @default.
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- W2246942789 doi "https://doi.org/10.2307/3899420" @default.
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