scholarly journals Using segmental isotope analysis of teleost fish vertebrae to estimate trophic discrimination factors of bone collagen

2018 ◽  
Vol 17 (2) ◽  
pp. 87-96 ◽  
Author(s):  
Jun Matsubayashi ◽  
Yu Umezawa ◽  
Michiya Matsuyama ◽  
Ryo Kawabe ◽  
Weiping Mei ◽  
...  
Keyword(s):  
Teleost Fish ◽  
Isotope Analysis ◽  
Bone Collagen ◽  
Discrimination Factors ◽  
Trophic Discrimination

scholarly journals Comparing compound-specific and bulk stable nitrogen isotope trophic discrimination factors across multiple freshwater fish species and diets

2017 ◽  
Vol 74 (8) ◽  
pp. 1291-1297 ◽  
Author(s):  
Chelsey M. Blanke ◽  
Yoshito Chikaraishi ◽  
Yuko Takizawa ◽  
Shawn A. Steffan ◽  
Prarthana S. Dharampal ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Freshwater Fish ◽  
Fish Species ◽  
Stable Isotope Analysis ◽  
Trophic Position ◽  
Isotope Analysis ◽  
Fish Muscle ◽  
Freshwater Fish Species ◽  
Discrimination Factors ◽  
Trophic Discrimination

Compound-specific nitrogen stable isotope analysis provides an approach for estimating animal trophic position that may overcome key issues associated with stable isotope analysis of bulk tissue. Yet compound-specific trophic discrimination factors have not been estimated for a broad range of habitats, taxa, and diets. We conducted a controlled-feeding experiment to characterize the variation in compound-specific (TDFAA) and bulk (TDFBulk) trophic discrimination factors of four freshwater fish species fed on three distinct diets. We also compared TDFAA of fish muscle and scale to evaluate the viability of scales for making food web inferences. Mean ± 1 SD TDFBulk was 2.2‰ ± 0.9‰, and there were significant effects of species and diet trophic position on TDFBulk. Mean ± 1 SD TDFAA was 6.9‰ ± 0.8‰. Although there was no effect of species on TDFAA, there were significant differences in TDFAA across the three diets. TDFAA from fish scales were not significantly different from those of muscle. Our study illustrates the advantages of estimating trophic position using compound-specific stable isotopes and the need for continued investigation of factors resulting in variation in TDF values.

The sensitivity of Neotoma to climate change and biodiversity loss over the late Quaternary

2021 ◽  
pp. 1-15
Author(s):  
Catalina P. Tomé ◽  
S. Kathleen Lyons ◽  
Seth D. Newsome ◽  
Felisa A. Smith
Keyword(s):  
Body Size ◽  
Late Quaternary ◽  
Climatic Variability ◽  
Isotope Analysis ◽  
Biodiversity Loss ◽  
Bone Collagen ◽  
Cam Plants ◽  
The Holocene ◽  
Carbon And Nitrogen ◽  
Terminal Pleistocene

Abstract The late Quaternary in North America was marked by highly variable climate and considerable biodiversity loss including a megafaunal extinction event at the terminal Pleistocene. Here, we focus on changes in body size and diet in Neotoma (woodrats) in response to these ecological perturbations using the fossil record from the Edwards Plateau (Texas) across the past 20,000 years. Body mass was estimated using measurements of fossil teeth and diet was quantified using stable isotope analysis of carbon and nitrogen from fossil bone collagen. Prior to ca. 7000 cal yr BP, maximum mass was positively correlated to precipitation and negatively correlated to temperature. Independently, mass was negatively correlated to community composition, becoming more similar to modern over time. Neotoma diet in the Pleistocene was primarily sourced from C3 plants, but became progressively more reliant on C4 (and potentially CAM) plants through the Holocene. Decreasing population mass and higher C4/CAM consumption was associated with a transition from a mesic to xeric landscape. Our results suggest that Neotoma responded to climatic variability during the terminal Pleistocene through changes in body size, while changes in resource availability during the Holocene likely led to shifts in the relative abundance of different Neotoma species in the community.

scholarly journals Vibrissae growth rates and trophic discrimination factors in captive southern sea otters (Enhydra lutris nereis)

2013 ◽  
Vol 94 (2) ◽  
pp. 331-338 ◽  
Author(s):  
Luke P. Tyrrell ◽  
Seth D. Newsome ◽  
Marilyn L. Fogel ◽  
Marissa Viens ◽  
Roxane Bowden ◽  
...  
Keyword(s):  
Growth Rates ◽  
Enhydra Lutris ◽  
Sea Otters ◽  
Enhydra Lutris Nereis ◽  
Discrimination Factors ◽  
Trophic Discrimination

Radiocarbon Dating and Dietary Stable Isotope Analysis of Kwaday Dän Ts'inchí

2007 ◽  
Vol 72 (4) ◽  
pp. 719-734 ◽  
Author(s):  
Michael P. Richards ◽  
Sheila Greer ◽  
Lorna T. Corr ◽  
Owen Beattie ◽  
Alexander Mackie ◽  
...  
Keyword(s):  
Radiocarbon Dating ◽  
Isotope Analysis ◽  
Human Remains ◽  
Isotopic Analysis ◽  
High Elevation ◽  
Bone Collagen ◽  
Contact Period ◽  
European Contact ◽  
Ams Dating ◽  
The Individual

We report here on the results of AMS dating and isotopic analysis of the frozen human remains named Kwaday Dän Ts'inchí and associated materials recovered from a glacier located in Northwest British Columbia, Canada in 1999. The isotopic analysis of bone collagen (bulk and single amino acids) from the individual indicates a strongly marine diet, which was unexpected given the location of this find, more than 100 km inland eroding out of a high elevation glacier; however, bulk hair and bone cholesterol isotopic values indicate a shift in diet to include more terrestrial foods in the year before death. The radiocarbon dating is not straightforward, as there are difficulties in determining the appropriate marine correction for the human remains, and the spread of dates on the associated artifacts clearly indicates that this was not a single use site. By combining the most recent date on a robe worn by Kwaday Dän Ts'inchi with direct bone collagen dates we conclude that the individual likely dates to between cal A.D. 1670 to 1850, which is in the pre-(or early) European contact period for this region.

Paleodietary Patterns of the Cherepakha 13 Site Population (Early Iron Age) in Primorye (Maritime) Province, Russian Far East, based on Stable Isotope Analysis

Radiocarbon ◽  
2018 ◽  
Vol 60 (5) ◽  
pp. 1611-1620 ◽  
Author(s):  
Yaroslav V Kuzmin ◽  
Vsevolod S Panov ◽  
Viacheslav V Gasilin ◽  
Sergei V Batarshev
Keyword(s):  
Stable Isotope ◽  
Iron Age ◽  
Isotope Composition ◽  
Russian Far East ◽  
Isotope Analysis ◽  
Far East ◽  
Bone Collagen ◽  
Early Iron Age ◽  
Terrestrial Mammals ◽  
Maritime Province

ABSTRACTNew paleodietary data were obtained after the discovery and excavation in 2015–2017 of the Cherepakha 13 site in the southern part of Primorye (Maritime) Province in far eastern Russia. The site is located near the coast of Ussuri Bay (Sea of Japan) and belongs to the Yankovsky cultural complex of the Early Iron Age 14C-dated to ca. 3000 BP (ca. 1200 cal BC). The stable isotope composition of the bone collagen for 11 humans and 30 animals was determined. For humans, the following values (with±1 sigma) were yielded: δ13C=–10.2±0.8‰; and δ15N=+12.4±0.3‰. The majority of terrestrial animals show the usual isotopic signals: δ13C=–19.4 ÷ –23.3‰; and δ15N=+4.6÷+6.6‰ (for wolves, up to +10.1‰); dogs, however, have an isotopic composition similar to humans: δ13C= –11.7±1.2‰; and δ15N=+12.4±0.4‰. Marine mammals have common values for pinnipeds: δ13C=–13.7 ÷ –14.6‰; and δ15N=+17.4 ÷ +18.0‰. The main food resources for the population of Cherepakha 13 site were (1) marine mollusks, fish, and mammals; and (2) terrestrial mammals; and possibly C4 plants (domesticated millets).

Tissue-specific isotope trophic discrimination factors and turnover rates in a marine elasmobranch: empirical and modeling results

2012 ◽  
Vol 69 (3) ◽  
pp. 551-564 ◽  
Author(s):  
Luis Malpica-Cruz ◽  
Sharon Z. Herzka ◽  
Oscar Sosa-Nishizaki ◽  
Juan Pablo Lazo
Keyword(s):  
Natural Populations ◽  
Nitrogen Isotope ◽  
Cartilage Tissue ◽  
Turnover Rates ◽  
Isotopic Equilibrium ◽  
Isotope Turnover ◽  
Discrimination Factors ◽  
Triakis Semifasciata ◽  
Leopard Sharks ◽  
Trophic Discrimination

There are very few studies reporting isotopic trophic discrimination factors and turnover rates for marine elasmobranchs. A controlled laboratory experiment was conducted to estimate carbon and nitrogen isotope trophic discrimination factors and isotope turnover rates for blood, liver, muscle, cartilage tissue, and fin samples of neonate to young-of-the-year leopard sharks ( Triakis semifasciata ). Trophic discrimination factors varied (0.13‰–1.98‰ for δ13C and 1.08‰–1.76‰ for δ15N). Tissues reached or were close to isotopic equilibrium to the new diet after about a threefold biomass gain and 192 days. Liver and blood exhibited faster isotope turnover than muscle, cartilage tissue, and fin samples, and carbon isotopes turned over faster than those of nitrogen. Metabolic turnover contributed substantially to isotopic turnover, which differs from most reports for young marine teleosts. We modeled the relationship between muscle turnover rates and shark size by coupling laboratory results with growth rate estimates for natural populations. Model predictions for small, medium, and large wild leopard sharks indicate the time to isotopic equilibrium is from one to several years.

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