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<p>Stable isotope analysis is used often in ecological studies to examine dietary patterns of consumers and food web structure, yet we still know little regarding some underlying assumptions, including for well-studied species like rainbow trout <i>Oncorhynchus mykiss</i>. We assessed δ<sup>13</sup>C and δ<sup>15</sup>N discrimination (∆) and turnover rates in blood, liver and white muscle of rainbow trout fed natural prey items (sculpin and chironomids). Liver had the fastest turnover rates for both δ<sup>15</sup>N and δ<sup>13</sup>C (4–6&#xa0;months), followed by blood (4–7&#xa0;months) and white muscle (7–9&#xa0;months). Metabolism accounted for more isotopic turnover (82–93%) than growth, with the exception of δ13C in the blood of rainbow trout fed chironomids (33% of isotopic turnover was metabolic). Discrimination factors differed by tissue and diet, with ∆δ<sup>15</sup>N showing highest enrichment in white muscle (3.8‰; 95% CI 3.3–4.3), followed by blood (2.9‰; 95% CI 2.4–3.4) and liver (2.5‰; 95% CI 1.9–3.1) compared to the hatchery diet. The ∆δ<sup>13</sup>C of liver showed higher enrichment (1.9‰; 95% CI 1.7–2.1) than white muscle (1.7‰; 95% CI 1.4–2.0) and blood (1.5‰; 95% CI 1.3–1.7). It is crucial that future models incorporate species-specific tissue turnover and discrimination factors to enable drawing strong inferences and improve accuracy of model predictions.</p>

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Effects of prey and tissue type on δ13C and δ15N discrimination and turnover rates of rainbow trout

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月14日

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  • Jon M. Flinders,
  • Ashley Clement,
  • Daniel D. Magoulick

摘要

Stable isotope analysis is used often in ecological studies to examine dietary patterns of consumers and food web structure, yet we still know little regarding some underlying assumptions, including for well-studied species like rainbow trout Oncorhynchus mykiss. We assessed δ13C and δ15N discrimination (∆) and turnover rates in blood, liver and white muscle of rainbow trout fed natural prey items (sculpin and chironomids). Liver had the fastest turnover rates for both δ15N and δ13C (4–6 months), followed by blood (4–7 months) and white muscle (7–9 months). Metabolism accounted for more isotopic turnover (82–93%) than growth, with the exception of δ13C in the blood of rainbow trout fed chironomids (33% of isotopic turnover was metabolic). Discrimination factors differed by tissue and diet, with ∆δ15N showing highest enrichment in white muscle (3.8‰; 95% CI 3.3–4.3), followed by blood (2.9‰; 95% CI 2.4–3.4) and liver (2.5‰; 95% CI 1.9–3.1) compared to the hatchery diet. The ∆δ13C of liver showed higher enrichment (1.9‰; 95% CI 1.7–2.1) than white muscle (1.7‰; 95% CI 1.4–2.0) and blood (1.5‰; 95% CI 1.3–1.7). It is crucial that future models incorporate species-specific tissue turnover and discrimination factors to enable drawing strong inferences and improve accuracy of model predictions.