Cited by 140Comparative Animal Anatomy StudiesForensic Anthropology and Bioarchaeology StudiesEvolution and Paleontology Studies

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DENTITION AND AGEING OF THE HIPPOPOTAMUS

Laws, R. M.·1968·African Journal of Ecology

DOI 10.1111/j.1365-2028.1968.tb00899.x

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Abstract

I. Summary The present paper is based on the examination of lower jaws from some 3000 individuals of Hippopotamus amphibius L. which were collected in the course of cropping operations in the Queen Elizabeth Park, Uganda between 1961 and 1966. It extends an earlier study by W. M. Longhurst, who described 20 relative age groups based on tooth replacement and wear. The age groups, slightly modified, are described and illustrated here and should serve as a useful field guide. Mean chronological ages from 0–43 years have been allocated to the groups. Checks which confirm the validity of the ages allotted are presented and discussed. These include correlation with the mandibular age group of six known‐age animals; findings on the age‐related incidence of rinderpest‐neutralising antibodies; the orderly progress of fusion of the mandibular symphysis and rate of loss of the first premolar. Growth layers present in the teeth are discussed. The growth of the eye lens is also described. After an initial phase of rapid growth the lens continues to grow throughout life and follows a rectilinear pattern from an estimated age of eight years onwards. This is expected from the findings of similar studies on other species for which known‐age specimens are available. Variability of lens dry weight at age is relatively small and indicates that the estimated ages are reasonably precise. Growth of the mandible is analysed and is not inconsistent with the ages allotted. A marked sex difference in m…

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Authors: Laws, R. M.
Affiliations: University of Cambridge (GB)
Corresponding author: Laws, R. M.
Venue: African Journal of Ecology
Publisher: Wiley
Published: 1968-08
Volume: 6
Issue: 1
Pages: 19-52
ISSN: 0141-6707 (ISSN-L)
1365-2028
DOI: 10.1111/j.1365-2028.1968.tb00899.x
OpenAlex: W1971888480
Cited by: 139
References: 29
Citations by year: 2026: 4 · 2025: 6 · 2024: 9 · 2023: 7 · 2022: 7 · 2021: 7 · 2020: 3 · 2019: 6 · 2018: 5 · 2017: 1 · 2016: 4 · 2015: 4 · 2014: 7 · 2013: 2 · 2012: 2
FWCI: 3.70
Type: journal article
Language: en
Open access: closed
Licence: onlinelibrary.wiley.com/termsAndConditions#vor (vor, 14516 d)
Locations: African Journal of Ecology (publishedVersion)
Topics: Health Sciences › Medicine › Anatomy › Comparative Animal Anatomy Studies
Social Sciences › Arts and Humanities › Archeology (arts and humanities) › Forensic Anthropology and Bioarchaeology Studies
Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
Keywords: hippopotamus, age estimation, mandible, tooth replacement, tooth wear, tooth resorption, body length growth, survival curves, life tables, population models

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DENTITION AND AGEING OF THE HIPPOPOTAMUS

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