2011
DOI: 10.1371/journal.pone.0021357
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Intrapopulation Variability Shaping Isotope Discrimination and Turnover: Experimental Evidence in Arctic Foxes

Abstract: BackgroundTissue-specific stable isotope signatures can provide insights into the trophic ecology of consumers and their roles in food webs. Two parameters are central for making valid inferences based on stable isotopes, isotopic discrimination (difference in isotopic ratio between consumer and its diet) and turnover time (renewal process of molecules in a given tissue usually measured when half of the tissue composition has changed). We investigated simultaneously the effects of age, sex, and diet types on t… Show more

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Cited by 60 publications
(90 citation statements)
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“…Ectotherms generally exhibit slower metabolic rates than do endotherms (Hulbert and Else 2004); thus, we would expect ectotherm tissues to be characterized by isotope turnover rates slower than those for endotherm tissues. Dalerum and Angerbjorn (2005), in a review of mammal and bird isotope studies, reported no estimated complete turnover rates (t 1/2 # 4) for plasma or RBCs greater than 160 d, with all but two rates less than 20 d. More recent studies have also found relatively Lecomte et al 2011). In contrast, reptile plasma and RBC tissues can display short estimated complete turnover rates (e.g., 19 d for Caretta caretta; table 2) but also much longer rates (e.g., 1,109 d for Alligator mississippiensis; table 2) that have never been found in endotherms.…”
Section: Discussionmentioning
confidence: 99%
“…Ectotherms generally exhibit slower metabolic rates than do endotherms (Hulbert and Else 2004); thus, we would expect ectotherm tissues to be characterized by isotope turnover rates slower than those for endotherm tissues. Dalerum and Angerbjorn (2005), in a review of mammal and bird isotope studies, reported no estimated complete turnover rates (t 1/2 # 4) for plasma or RBCs greater than 160 d, with all but two rates less than 20 d. More recent studies have also found relatively Lecomte et al 2011). In contrast, reptile plasma and RBC tissues can display short estimated complete turnover rates (e.g., 19 d for Caretta caretta; table 2) but also much longer rates (e.g., 1,109 d for Alligator mississippiensis; table 2) that have never been found in endotherms.…”
Section: Discussionmentioning
confidence: 99%
“…We used values from Roth and Hobson (2000) for red foxes (red blood cells: ⌬␦ 13 C = 0.7‰ and ⌬␦ 15 N = 2.6‰; muscle: ⌬␦ 13 C = 1.1‰ and ⌬␦ 15 N = 3.3‰; hair: ⌬␦ 13 C = 2.6‰ and ⌬␦ 15 N = 3.2‰) and from Lecomte et al (2011) for arctic foxes (red blood cells: ⌬␦ 13 C = 0.5‰ and ⌬␦ 15 N = 1.8‰; muscle: ⌬␦ 13 C = 0.4‰ and ⌬␦ 15 N = 1.8‰; hair: ⌬␦ 13 C = 2.2‰ and ⌬␦ 15 N = 3.3‰). No fractionation estimate of fox bone collagen exists, so we used the mean fractionation estimates (⌬␦ 13 C = 1.0‰ and ⌬␦ 15 N = 3.6‰) calculated from wolf (Canis lupus L., 1758) bones (Bocherens and Drucker 2003).…”
Section: Discussionmentioning
confidence: 99%
“…No fractionation estimate of fox bone collagen exists, so we used the mean fractionation estimates (⌬␦ 13 C = 1.0‰ and ⌬␦ 15 N = 3.6‰) calculated from wolf (Canis lupus L., 1758) bones (Bocherens and Drucker 2003). We accounted for uncertainty in fractionation estimates in our mixing model analysis by using estimates from Lecomte et al (2011) for red blood cells and muscle (SD of ⌬␦ 13 C = 0.1‰ and SD of ⌬␦ 15 N = 0.5‰) and for hair (SD of ⌬␦ 13 C = 0.4‰ and SD of ⌬␦ 15 N = 0.6‰); we used these values for both fox species. Bocherens and Drucker (2003) did not estimate error for their wolf bone collagen fractionation values; therefore, we used large values (SD of ⌬␦ 13 C = 1.0‰ and SD of ⌬␦ 15 N = 1.0‰) to account for uncertainty in the red fox bone collagen fractionation.…”
Section: Discussionmentioning
confidence: 99%
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“…The stable isotope values of a consumer are equal to the mean values of its diet minus a discrimination factor, which reflects the fact that certain biochemical processes discriminate against the heavy isotope ( Deniro and Epstein, 1981). Discrimination factors are likely to be tissue-and species-specific, and the results of mixing models have been shown to be sensitive to changes in discrimination factors (Bond and Diamond, 2011 Lecomte et al, 2011): 1.1 and 3.0 for muscle and 2.4 and 3.4 for fur, for δ 13 C and δ 15 N, respectively. The estimation of the mixing proportions in SIAR is based on Markov Chain Monte Carlo resampling (Parnell et al, 2010).…”
Section: Stable Isotope Analysis: Diet Inferencementioning
confidence: 99%