Abstract
Increasing evidence suggests that conditions in early life have important consequences for body size and fitness in mammals. As regards herbivores, teeth play a central role in the long-term performance of individuals. So far, however, patterns of teeth eruption have been scarcely investigated in relation to environmental and climatic factors experienced by herbivores. We described the eruption timing of mandibular teeth in a population of roe deer (Capreolus capreolus) located in the Apennines (Central Italy), through the analysis of 2161 jaws of fawns (1176 females and 985 males) shot in their first winter of life over three hunting seasons (2013–2015). Results showed that the percentage of juveniles exhibiting permanent teeth depends on the cohort. Among the factors that may affect both incisiviform and molariform teeth replacement timing, our findings include body mass and population density. Additional factors determining the relative speed of teeth replacement are (1) food availability for the mother during the last part of gestation, the birth period and the lactation, (2) winter temperature experienced by the mother, and (3) temperature experienced by fawns during their first summer and autumn. Besides, for the first time in literature, elevation was reported to delay front teeth replacement. A greater number of climatic factors were found to shape the eruption timing of the third molar (M3) in comparison to that of incisiviform teeth. Also, a different pattern was found in males and females. The eruption of M3 is, indeed, a costly and long-lasting process requesting optimal nutritional conditions and the meeting of a threshold jaw size. Our results indicate a strong correlation between environmental conditions and eruption process, i.e., between resource availability during the gestation and rearing periods and eruption timing.
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Acknowledgments
We are grateful to Arezzo Province for supplying data. We are indebted to L. Mattioli and M. Meacci for their logistic support in collecting data. We would like to thank all the hunters who provided samples of roe deer jaws, without which the study would not be possible. G. Falceri revised the English version of this article.
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De Marinis, A.M., Chirichella, R., Bottero, E. et al. Ecological factors affecting eruption timing of mandibular teeth in roe deer. Eur J Wildl Res 64, 50 (2018). https://doi.org/10.1007/s10344-018-1211-0
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DOI: https://doi.org/10.1007/s10344-018-1211-0