Sr/Ca and Ba/Ca variations in environmental and biological sources: A survey of marine and terrestrial systems

Peek, Stephanie; Clementz, Mark T.

doi:10.1016/j.gca.2012.07.026

Cited by 46 publications

(40 citation statements)

References 100 publications

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“…If Texas hawksbills are generalist bottom feeders like Kemp's ridleys in the same region, which forage on a variety of benthic invertebrate prey (i.e. higher δ 15 N values), they may also consume higher levels of sediment (and thereby baryte) that would lead to elevated Ba:Ca ratios (Peek & Clementz 2012). Additional research is ultimately needed to clarify mechanisms underpinning variability in sea turtle bone elemental ratios.…”

Section: Oceanic Stage Duration and Age At Maturationmentioning

confidence: 99%

Hawksbill sea turtle life-stage durations, somatic growth patterns, and age at maturation

Avens

Ramirez

Goshe

et al. 2021

Endang. Species. Res.

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Sea turtles exhibit complex life histories, encompassing intermittent use of multiple spatially separated habitats throughout long lifespans. This broad scope presents challenges for collecting comprehensive biological and ecological data, yet absence of such information complicates evaluation of management strategies for populations at risk of extinction. Hawksbill sea turtles Eretmochelys imbricata are endangered worldwide, primarily due to long-term, directed harvest. However, available information regarding life stage durations, somatic growth patterns, and maturation attributes to enhance understanding of anthropogenic impacts and recovery potential remains constrained. To address these data gaps in the western North Atlantic, we conducted skeletochronological analysis for hawksbills stranded along US coastlines to generate straight-line carapace length (SCL)-at-age and somatic growth data. Generalized additive mixed models and bootstrapped von Bertalanffy growth curves were used to characterize age at maturation and covariate influence on somatic growth. For a subset of turtles, annual bone growth increment-specific stable isotope and trace element analyses were incorporated to evaluate habitat use relative to age. Integration of these data sources indicated that juveniles transitioned from oceanic to neritic habitat at 1-3 yr old and mean SCLs of 23-24 cm (range 15.7-35.0 cm). Initial ages at maturation for this population at minimum nesting female SCLs were estimated at 15-25 yr. Somatic growth varied significantly relative to size, age, and stranding location, while no association with sex or calendar year was observed. Our results demonstrate the utility of these complementary analytical approaches for generating baseline data fundamental to characterizing hawksbill sea turtle population attributes.

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Section: Oceanic Stage Duration and Age At Maturationmentioning

confidence: 99%

Hawksbill sea turtle life-stage durations, somatic growth patterns, and age at maturation

Avens

Ramirez

Goshe

et al. 2021

Endang. Species. Res.

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“…Following sampling and dissolution, bone or teeth are subjected to chemical purification in the clean laboratory using acids and ion exchange resins to remove the phosphate matrix and any other elements that could potentially lead to destabilization or interference in the isotopic measurements. Strontium is present in variable concentration in vertebrate apatite (Peek & Clementz ) and needs to be removed. Because both doubly charged strontium and single charged calcium have similar mass to charge ratios (m/z) for the main measured isotopes ( 84 Sr ++ , 86 Sr ++ and 88 Sr ++ interfering with 42 Ca + , 43 Ca + and 44 Ca + respectively) the strontium has to be removed from the sample to avoid interference with calcium during the analysis.…”

Section: From the Sample To The Isotope Ratiomentioning

confidence: 99%

Non‐traditional isotope perspectives in vertebrate palaeobiology

2017

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The recent development of Multi-Collector Inductively Coupled PlasmaMass Spectrometry (MC-ICPMS), notably in the disciplines of earth sciences, now allows the measurement of precise isotope ratios, even under low concentration. Nontraditional isotope systems, such as alkaline earth (Ca, Mg) and transition (Cu, Fe, Zn) metals are now being measured in a variety of biological tissues, including bone and teeth. Although our understanding of the environmental and biological mechanisms behind the fractionation of such elements is still in its infancy, some of these isotopes are suspected to fractionate along the food chain as has been reported in the literature for calcium, magnesium and zinc. Other geochemical methods, such as concentration analyses permit a prior assessment of diagenesis in the fossils to be analysed and such an approach allows recognising that in some circumstances, not only enamel but also dentine or bone can preserve its original biogenic composition. The aims here are to review the current knowledge surrounding these various isotopic tools, address their potential preservation in biological apatite and provide the palaeobiologist a guide on the different toolkits available and discuss their potential applications in vertebrate palaeobiology with a case study involving two mammal assemblages from the Pleistocene of Europe.Key words: non-traditional isotopes, palaeobiology, calcium, cave bear, Pleistocene.GEOCHEMICAL tools are a great asset to infer biological characteristics in fossil organisms that otherwise would remain completely unnoticed with morphological 2 observations alone. Among stable isotopes, carbon (C), oxygen (O) and nitrogen (N) have been and are still widely used in ecology, archaeology and in palaeoecology.From the vertebrate individual organism to the community, it is possible to reconstruct body temperatures and infer thermophysiology, reconstruct ambient palaeoenvironmental conditions and infer habitat use and migrations; and last but not least to reconstruct diet and trophic structures in ancient food webs. Most isotope approaches rely on stable isotope ratios of carbon and oxygen but also on radiogenic strontium preserved in fossilised tooth and bone. Elemental concentrations have also proved useful in many contexts such as dietary inference. For example, elemental ratios of strontium to calcium or barium to calcium allow reconstructing ecosystem structures.Contrary to light isotope systems, which have a variability beyond 10 ‰, nontraditional isotopes comprising alkaline earths (Ca, Mg) or transition metals (Cu, Fe, Zn), show isotope variability within a maximum range of 2-3‰. Recent analytical progresses from the domains of earth sciences now allow the measurement of such stable isotope systems, which show limited fractionation and require high precision and accuracy of measurements from mass spectrometers. The main basis for all those geochemical applications is already starting to be applied to archaeological studies (see review by Jaouen and Pons, 2016...

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“…This has been well documented in studies from other countries [40][41][42]. In seawater the levels of Ba amounts are due to processes of biological export of Ba at the surface, remobilisation at depth and rapid production of marine barite [41][42][43]. Another factor contributing to different amounts of Ba in seawater is freshwater input [44].…”

Section: Icp-msmentioning

confidence: 74%