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Survival of European Mouflon (Artiodactyla: Bovidae) in Hawai‘i Based on Tooth Cementum Lines

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Title: Survival of European Mouflon (Artiodactyla: Bovidae) in Hawai‘i Based on Tooth Cementum Lines
Authors: Hess, Steven C.
Stephens, Robert M.
Thompson, Tommy L.
Danner, Raymond M.
Kawakami Jr., Ben.
LC Subject Headings: Natural history--Periodicals.
Natural history--Pacific Area--Periodicals.
Issue Date: Jan 2011
Publisher: Honolulu, University of Hawaii
Citation: Hess SC, Stephens RM, Thompson TL, Danner RM, Kawakami Jr, B. Survival of European Mouflon (Artiodactyla: Bovidae) in Hawai‘i Based on Tooth Cementum Lines Pac Sci 65(1): 59-68.
Series/Report no.: vol. 65, no. 1
Abstract: Reliable techniques for estimating age of ungulates are necessary to determine population parameters such as age structure and survival. Techniques that rely on dentition, horn, and facial patterns have limited utility for European mouflon sheep (Ovis gmelini musimon), but tooth cementum lines may offer a useful alternative. Cementum lines may not be reliable outside temperate regions, however, because lack of seasonality in diet may affect annulus formation. We evaluated the utility of tooth cementum lines for estimating age of mouflon in Hawai‘i in comparison to dentition. Cementum lines were present in mouflon from Mauna Loa, island of Hawai‘i, but were less distinct than in North American sheep. The two age estimation methods provided similar estimates for individuals aged a3 yr by dentition (the maximum age estimable by dentition), with exact matches in 51% (18/35) of individuals, and an average difference of 0.8 yr (range 0–4). Estimates of age from cementum lines were higher tha those from dentition in 40% (14/35) and lower in 9% (3/35) of individuals. Discrepancies in age estimates between techniques and between paired tooth samples estimated by cementum lines were related to certainty categories assigned by the clarity of cementum lines, reinforcing the importance of collecting a sufficient number of samples to compensate for samples of lower quality, which in our experience, comprised approximately 22% of teeth. Cementum lines appear to provide relatively accurate age estimates for mouflon in Hawai‘i, allow estimating age beyond 3 yr, and they offer more precise estimates than tooth eruption patterns. After constructing an age distribution, we estimated annual survival with a log-linear model to be 0.596 (95% CI 0.554–0.642) for this heavily controlled population.
Description: v. ill. 23 cm.
Pages/Duration: 10 p.
ISSN: 0030-8870
Appears in Collections:Pacific Science, Volume 65, Number 1, 2011

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