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Comparison Of Enamel Microstructure Of Ictidomys Tridecemlineatus Formed During Hibernation Versus The Active Season, Amanda Cho
Honors Theses
Ground squirrel incisors grow continuously, preserving a record of their most recent weeks of life. Previous research demonstrated that an abnormality in the surface of incisor enamel and dentin of thirteen-lined ground squirrels (Ictidomys tridecemlineatus) corresponded with hibernation. Using scanning electron microscopy, we compared internal microstructure of incisor enamel deposited during and outside of hibernation to determine if surface disruptions corresponded to differences in internal microstructure. For one specimen, hibernation enamel displayed irregularities in microstructure that were not present in non-hibernation enamel, but this difference was not observed in other specimens. Given these inconclusive results, further research is warranted.
Spatial And Seasonal Signals In Stable Isotopes Of Incisor Enamel From Free-Ranging, Thirteen-Lined Ground Squirrels, Jacob Andrew Brassington
Spatial And Seasonal Signals In Stable Isotopes Of Incisor Enamel From Free-Ranging, Thirteen-Lined Ground Squirrels, Jacob Andrew Brassington
Honors Theses
From early May through late September, 2012, we captured, tagged, and collected body masses from multiple, free-ranging thirteen-lined ground squirrels (Ictidomys tridecemlineatus) in southwestern Michigan, with 14 individuals recaptured 1 or more times through the season. Beginning in mid-June, we captured and euthanized 12 or these individuals (on average, about 1 per week) to allow study of their lower incisors. We serially micro-sampled enamel along squirrel incisors using laser ablation and determined stable isotope ratios (d13 and d18 O) with gas chromatography-isotope-ratio mass spectrometry (GC-IRMS). The resulting values fell into two spatial groups. Specimens collected within 25 m of a …