期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 221, 期 21, 页码 -出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jeb.186411
关键词
Dietary signal; Grit; Tooth wear; Controlled food trials; Ruminant
类别
资金
- Swiss National Science Foundation (Schweizerischer Nationalfonds zur Forderung der Wissenschaftlichen Forschung) [31003A_163300/1]
- Candoc Forschungskredit, Universitat Zurich
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (ERC CoG) [681450]
Dental mesowear is applied as a proxy to determine the general diet of mammalian herbivores based on tooth-cusp shape and occlusal relief. Low, blunt cusps are considered typical of grazers and high, sharp cusps typical of browsers. However, how internal or external abrasives impact mesowear, and the time frame the wear signature takes to develop, still need to be explored. Four different pelleted diets of increasing abrasiveness (lucerne, grass, grass and rice husks, and grass, rice husks and sand) were fed to four groups of a total of 28 adult goats in a controlled feeding experiment over a 6-month period. Tooth morphology was captured by medical CT scans at the beginning and end of the experiment. These scans, as well as the crania obtained post modem, were scored using the mesowear method. Comparisons between diet groups showed few significant differences after 6 months, irrespective of whether CT scans or the real teeth were scored. Only when assessing the difference in signal between the beginning and the end of the experiment did relevant, significant diet-specific effects emerge. Diets containing lower phytolith content caused a more pronounced change in mesowear towards sharper cusps/higher reliefs, while the feed containing sand did not result in more extreme changes in mesowear when compared with the same feed without sand. Our experiment suggests that the formation of a stable and hence reliable mesowear signal requires more time to develop than 6 months.
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