δ15N and δ13C diet–tissue discrimination factors for large sharks under semi-controlled conditions

2010 ◽  
Vol 155 (4) ◽  
pp. 445-453 ◽  
Author(s):  
Nigel E. Hussey ◽  
Jaclyn Brush ◽  
Ian D. McCarthy ◽  
Aaron T. Fisk
Keyword(s):  
Controlled Conditions ◽  
Tissue Discrimination ◽  
Discrimination Factors ◽  
Δ15n And Δ13c

Diet discrimination factors are inversely related to δ15N and δ13C values of food for fish under controlled conditions

2010 ◽  
Vol 24 (24) ◽  
pp. 3515-3520 ◽  
Author(s):  
Caroline A. Dennis ◽  
M. Aaron MacNeil ◽  
Jennifer Y. Rosati ◽  
Trevor E. Pitcher ◽  
Aaron T. Fisk
Keyword(s):  
Δ13c Values ◽  
Controlled Conditions ◽  
Discrimination Factors ◽  
Δ15n And Δ13c

Diet–tissue discrimination factors of carbon and nitrogen stable isotopes in blood of Snowy Owl (Bubo scandiacus)

2011 ◽  
Vol 89 (4) ◽  
pp. 343-347 ◽  
Author(s):  
J.-F. Therrien ◽  
G. Fitzgerald ◽  
G. Gauthier ◽  
J. Bêty
Keyword(s):  
Stable Isotopes ◽  
Bird Species ◽  
Potential Effect ◽  
Mouse Muscle ◽  
Blood Samples ◽  
Web Studies ◽  
Tissue Discrimination ◽  
Discrimination Factors ◽  
Snowy Owl ◽  
Bubo Scandiacus

Analysis of carbon (13C/12C) and nitrogen (15N/14N) stable isotope ratios (hereafter δ13C and δ15N, respectively) in animal tissues is a powerful tool in food-web studies. However, isotopic ratios of prey are not transmitted directly to a consumer, as a diet–tissue discrimination factor (denoted Δ) occurs between sources and consumer’s tissues. An accurate assessment of the diet of a consumer with stable isotopes thus requires that the Δ13C and Δ15N of the studied species are known. Our aim was to establish Δ13C and Δ15N values in the Snowy Owl ( Bubo scandiacus (L., 1758)). Moreover, we assessed the potential effect of ethanol preservation of blood samples on δ13C and δ15N values. We kept four captive adult Snowy Owls on a pure diet of mice for ≥6 weeks. We then collected mouse muscle and blood samples from the owls and analyzed their δ13C and δ15N values. Δ13C and Δ15N values (mean ± SE) for owl blood were +0.3‰ ± 0.2‰ and +1.9‰ ± 0.1‰, respectively. These values are the first discrimination factors ever reported in Strigiformes and are lower, for Δ15N, than those obtained in terrestrial carnivores and other bird species, including falcons. Preservation in ethanol did not significantly affect δ13C and δ15N values.

scholarly journals Variable δ15N Diet-Tissue Discrimination Factors among Sharks: Implications for Trophic Position, Diet and Food Web Models

PLoS ONE ◽  
2013 ◽  
Vol 8 (10) ◽  
pp. e77567 ◽  
Author(s):  
Jill A. Olin ◽  
Nigel E. Hussey ◽  
Alice Grgicak-Mannion ◽  
Mark W. Fritts ◽  
Sabine P. Wintner ◽  
...  
Keyword(s):  
Food Web ◽  
Trophic Position ◽  
Tissue Discrimination ◽  
Discrimination Factors

Ontogenetic dependence of Nile crocodile ( Crocodylus niloticus ) isotope diet‐to‐tissue discrimination factors

2021 ◽  
Author(s):  
Stephan Woodborne ◽  
Hannes Botha ◽  
David Huchzermeyer ◽  
Jan Myburgh ◽  
Grant Hall ◽  
...  
Keyword(s):  
Tissue Discrimination ◽  
Nile Crocodile ◽  
Discrimination Factors

scholarly journals Discrimination factors (Δ15N and Δ13C) in an omnivorous consumer: effect of diet isotopic ratio

2008 ◽  
Vol 22 (2) ◽  
pp. 255-263 ◽  
Author(s):  
Stéphane Caut ◽  
Elena Angulo ◽  
Franck Courchamp
Keyword(s):  
Isotopic Ratio ◽  
Discrimination Factors ◽  
Δ15n And Δ13c

scholarly journals Diet to tissue discrimination factors for the blood and feathers of the monk parakeet (Myiopsitta monachus) and the ring–necked parakeet (Psittacula krameri)

2019 ◽  
pp. 389-395 ◽  
Author(s):  
D. Mazzoni ◽  
N. A. Borray-Escalante ◽  
A. Ortega–Segalerva ◽  
L. Arroyo ◽  
J. González–Solís ◽  
...  
Keyword(s):  
Nitrogen Isotopes ◽  
Single Species ◽  
Prey Type ◽  
Monk Parakeet ◽  
Carbon And Nitrogen ◽  
Myiopsitta Monachus ◽  
Psittacula Krameri ◽  
Tissue Discrimination ◽  
The Difference ◽  
Discrimination Factors

Stable isotope analyses (SIAs) have been widely used in recent years to infer the diet of many species. This isotopic approach requires using diet to tissue discrimination factors (DTDFs) for each prey type and predator tissue, i.e., to determine the difference between the isotopic composition of the predator tissues and the different prey that conform its diet. Information on DTDF values in Psittaciformes is scarce. The aim of this study was to assess DTDF values for the carbon and nitrogen isotopes of the monk parakeet (Myiopsitta monachus) and the ring–necked parakeet (Psittacula krameri), two invasive alien species of concern. We fed captive birds of the two parakeet species on a single–species diet based on sunflower seeds to establish the DTDFs for the blood and feathers. In the monk parakeet (N = 9) DTDFs were Δδ13C 2.14 ‰ ± 0.90 and Δδ15N 3.21 ‰ ± 0.75 for the blood, and Δδ13C 3.97 ‰ ± 0.90 and Δδ15N 3.67 ‰ ± 0.74 for the feathers. In the ring–necked parakeet (N = 9), the DTDFs were Δδ13C (‰) 2.58 ± 0.90 and Δδ15N (‰) 2.35 ± 0.78 for the blood, and Δδ13C 3.64 ‰ ± 0.98 and Δδ15N 4.10 ‰ ± 1.84 for the feathers. DTDF values for the ring–necked parakeet blood were significantly higher than those for the monk parakeet blood. No difference was found between the two species in the DTDF for feathers. Our findings provide the first values of DTDFs for blood and feathers in these parakeets, factors that are key to infer the diet of these species based on SIA.

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