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作者 Kang, Jia-Cih; Lin, Chien-Hsiang;Chang, Chun-Hsiang
出版日期2021
已接受202103
著作名稱Age and growth of Palaeoloxodon huaihoensis from Penghu Channel, Taiwan: significance of their age distribution based on fossils
刊名PeerJ
被收錄索引SCI
主題古生物
關鍵字Age distribution; Pleistocene; Subtropical West Pacific; Elephant age group; Lamellar frequency; Tooth morphology; Taiwan; Penghu Channel
摘要Dental material attributed to Palaeoloxodon huaihoensis from the Middle to Late Pleistocene were recovered over decades from the Penghu Channel during commercial fisheries activities. The National Museum of Nature Science (NMNS) has a collection of such dental material, which differs in size and morphology and likely represents ontogenetic variation and growth trajectory of various age groups of P. huaihoensis. However, little is known regarding age determination. By using length of dental material, enamel thickness (ET), and plate counts, we established the method to distinguish the age of the species, which is directly derived from the extant African forest elephant Loxodonta africana. When measuring signs of allometric growth, we found that in both the upper and lower jaws, tooth width was correlated negatively with lamellar frequency but positively with ET. In the same age group, the number of lamellae was higher in P. huaihoensis than in L. africana. The reconstructed age distribution indicated no difference in the upper or lower jaw. Notably, within our sample, P. huaihoensis is skewed towards adult and older individuals with median age between 33 site. This age distribution pattern is speculated to be related to the harsh environmental conditions and intense intraspecific competition among P. huaihoensis during the last ice age.
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DOI10.7717/peerj.11236
系統號NO000005996

Aug 20 2021 11:12:17
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