Dietary studies of xenarthrans are challenging as geochemical or microscopic examinations utilize enamel, which xenarthrans lack. The relative softness of dentin makes it potentially more prone to taphonomic alteration; thus, we aim to determine if dental microwear texture analysis (DMTA, which quantifies microwear in 3-D) of dentin can yield biologically meaningful results. Here we ask the following questions: i) are there consistent differences between dentin and enamel from teeth that have been subjected to the same food and bite forces (e.g., carnassial teeth); ii) can DMTA differentiate between extant and extinct xenarthrans with different diets (observed and morphologically inferred, respectively); and iii) is dentin microwear texture a reliable and comparable indicator of dietary ecology?
DMTA characters of different dental tissues in the carnassials of Florida panthers (Puma concolor coryi) were not significantly different from one another (except textural fill volume and heterogeneity); however, differences between tissues are highly variable. Dentin DMTA characteristic in sloths (Bradypus variegatus and Choloepus hoffmanni) and nine-banded armadillos (Dasypus novemcinctus) lack significant differences, except for greater textural fill volume and complexity in D. novemcinctus as compared to B. variegatus and Pilosa, respectively. All extinct taxa showed significant overlap in complexity and anisotropy, with values often below or above expected values from similarly feeding mammals with enamel teeth. Further, no differences were observed between like taxa over time. The high degree of overlap in most DMTA characters, despite divergent diets and differential grit consumption, questions the use of DMTA of dentin in extant and extinct xenarthrans.
| Identifer | oai:union.ndltd.org:VANDERBILT/oai:VANDERBILTETD:etd-11222012-233627 |
| Date | 04 December 2012 |
| Creators | Haupt, Ryan James |
| Contributors | Larisa R. G. DeSantis, Guilherme Gualda, Molly F. Miller |
| Publisher | VANDERBILT |
| Source Sets | Vanderbilt University Theses |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.library.vanderbilt.edu/available/etd-11222012-233627/ |
| Rights | restricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Vanderbilt University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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