Trace-element analysis of Steller sea lion (Eumetopias jubatus) teeth using a scanning X-ray analytical microscope

Ando-Mizobata, Noriko; Sakai, Mitsuo; Sakurai, Yasunori

doi:10.3106/1348-6160(2006)31[65:taossl]2.0.co;2

Cited by 6 publications

(6 citation statements)

References 11 publications

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“…Growth layers in animal tissues have been correlated with life-history events in some mammals. For example, trace elements and hormones extracted from sequential tissue growth layers have been used to reconstruct diet, stress levels, reproductive events, chemical exposure, and health dynamics over an animal’s lifetime (Evans et al 1995; Edmonds et al 1997; Ando-Mizobata et al 2006; Trumble et al 2013). In other cases, specific line and band patterns have been associated with the attainment of sexual maturity (Harwood and Prime 1978; Klevezal and Stewart 1994; Medill et al 2010), pregnancy and nursing cycles (Scheffer and Peterson 1967; Klevezal and Myrick 1984; Coy and Garshelis 1992), and dietary shifts due to climatic anomalies (Robinette and Archer 1971; Manzanilla 1989).…”

Section: Discussionmentioning

confidence: 99%

Accuracy, precision, and error in age estimation of Florida manatees using growth layer groups in earbones

Lonati

Howell

Hostetler

et al. 2019

Journal of Mammalogy

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Ages of Florida manatees (Trichechus manatus latirostris) can be estimated by counting annual growth layer groups (GLGs) in the periotic dome portion of the tympanoperiotic complex of their earbones. The Florida Fish and Wildlife Conservation Commission manages an archive of more than 8,700 Florida manatee earbones collected from salvaged carcasses from 1989 to 2017. Our goal was to comprehensively evaluate techniques used to estimate age, given this large sample size and changes to processing protocols and earbone readers over time. We developed new standards for estimating ages from earbones, involving two independent readers to obtain measurements of within- and between-reader precision. To quantify accuracy, precision, and error, 111 earbones from manatees with approximately known ages (first known as calves: “KAC”) and 69 earbones from manatees with minimum known ages (“MKA,” based on photo-identification sighting histories) were processed, and their ages were estimated. There was greater precision within readers (coefficient of variation, CV: 2.4–8.5%) than between readers (CV: 13.1–13.3%). The median of age estimates fell within the true age range for 63.1% of KAC cases and was at least the sighting duration for 75.0% of MKA cases. Age estimates were generally unbiased, as indicated by an average raw error ± SD of −0.05 ± 3.05 years for the KAC group. The absolute error (i.e., absolute value of raw error) of the KAC data set averaged 1.75 ± 2.50 years. Accuracy decreased and error increased with increasing known age, especially for animals over 15 years old, whose ages were mostly underestimated due to increasing levels of resorption (the process of bone turnover that obscures GLGs). Understanding the degree of uncertainty in age estimates will help us assess the utility of age data in manatee population models. We emphasize the importance of standardizing and routinely reviewing age estimation and processing protocols to ensure that age data remain consistent and reliable.

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Section: Discussionmentioning

confidence: 99%

Accuracy, precision, and error in age estimation of Florida manatees using growth layer groups in earbones

Lonati

Howell

Hostetler

et al. 2019

Journal of Mammalogy

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“…During the mineralization phase of tooth development, trace elements can be incorporated within the crystalline apatite [40,56]. Previous studies have used trace element concentration in marine mammal teeth to identify the timing of life-history events, identify the maternal transfer of contaminants, explore habitat utilization, and assess the spatial and temporal changes in environmental trace element concentrations, particularly those of anthropogenic origin [10-12, 15, 58].…”

Section: Discussionmentioning

confidence: 99%

“…In marine mammals, more than 20 elements have been reported in dental tissues including Ba, carbon (C), Ca, Cd, Cl, copper 6 (Cu), Cr, cobalt (Co), fluorine (F), iron (Fe), Pb, Mg, Hg, P, selenium (Se), Na, strontium (Sr), vanadium (V), and Z [8-13, 15,17, 19, 38-41] To determine the elemental composition within the tooth structure, several in situ analytical methods are currently available. Some techniques involve the use of electron or proton microprobes with X-ray emission detectors, such as scanning electron microscopes (SEM) equipped with energy dispersive X-ray detection (EDS) and particle-induced X-ray fluorescence (PIXE), respectively [19,38,[40][41]. These techniques are advantageous because they require little sample preparation and have the spatial resolution necessary to measure the concentration or wt % of elements within GLG's.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Use of SEM–EDS Analysis to Measure the Distribution of Major, Minor, and Trace Elements in Bottlenose Dolphin (Tursiops truncatus) Teeth

McCormack

McFee

Whitehead

et al. 2021

Biol Trace Elem Res

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Network under a NOAA parts authorization letter pursuant to 50 CFR 216.22. issued to Jessica Dutton. NOAA Disclaimer: The scientific results and conclusions, as well as any opinions expressed herein, are those of the authors and do not necessarily reflect the views of NOAA or the Department of Commerce. The mention of any commercial product is not meant as an endorsement by the Agency or Department.

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“…However, the dugong swam quickly away from the ship, which is normal behaviour of the dugong when disturbed by human activities, including ship traffic. Ship engines are known to have acoustic sound frequencies that interfere with dugong communication [19], [20]. The second dugong sighting occurred in May 2023 (Figure 4B), obtained from drone camera footage, taken over the waters of Daun Village, Bawean Island.…”

Section: Figure 3 Life Cycle Of Dugong Dugonmentioning

confidence: 99%

Dugong dugon (Muller 1776) and Its Habitat in Coastal Areas and Small Islands of East Java Province, Indonesia

Dewi,

Wahyudi,

Widodo

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Dugong dugon, an endangered marine mammal is listed the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). Dugongs are classified as herbivorous mammals that live in the shallows associated with seagrass beds. The objectives of this study are (1) to collect data on dugong encounters in East Java, both direct encounters and literature studies; and (2) to analyze seagrass meadows that are potentially dugong grazing habitats in East Java. This study was conducted from January to July 2023 in the coastal area of East Java. Dugong and seagrass data, which were descriptively analyzed, were obtained from the literature, questionnaire interview, and by direct observation. Distribution of dugongs in East Java is known to be in the southeastern side of Banyuwangi, Situbondo, Sumenep, Lamongan, and Bawean Island. Direct encounters with live and dead dugongs in East Java have been recorded in several locations, including Bawean Island. Seagrass beds in East Java can be found on the coastal area of Lamongan, Bawean Island - Gresik, Sumenep, Bangkalan, Situbondo, Banyuwangi, Malang, and Pacitan. The seagrass species found in these eight areas are: E. acoroides, T. hemprichii, C. modocea rotundata, C. serrulata, H. pinifolia, H. uninervis, H. decipiens, H. ovalis, H. minor, S. iseotifolium, and T. ciliatum. Although, dugong status is fully protected in Indonesia, and its distribution is limited, further steps are needed to protect dugongs and their food habitats. Marine Protected Area is one of the policies that could be recommended to protect dugongs and their habitat.

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Trace-element analysis of Steller sea lion (Eumetopias jubatus) teeth using a scanning X-ray analytical microscope

Cited by 6 publications

References 11 publications

Accuracy, precision, and error in age estimation of Florida manatees using growth layer groups in earbones

Accuracy, precision, and error in age estimation of Florida manatees using growth layer groups in earbones

Exploring the Use of SEM–EDS Analysis to Measure the Distribution of Major, Minor, and Trace Elements in Bottlenose Dolphin (Tursiops truncatus) Teeth

Dugong dugon (Muller 1776) and Its Habitat in Coastal Areas and Small Islands of East Java Province, Indonesia

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