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<p>Stable isotope analysis (SIA) is a powerful tool for assessing resource use and trophic structure, enhancing understanding of coexistence mechanisms among sympatric species. In this study, we analyzed carbon (δ¹³C) and nitrogen (δ¹⁵N) stable isotopes in bone collagen of three coexisting anuran species—<i>Bombina orientalis</i>, <i>Rana uenoi</i>, and <i>R. huanrenensis</i>—from South Korean forest to evaluate their isotopic niches, resource partitioning, and within-population variation. <i>Rana uenoi</i> and <i>R. huanrenensis</i> utilized a broad range of resources with high overlap, suggesting they likely share dietary habits and occupy similar trophic roles. In contrast, relative δ¹⁵N enrichment of <i>B. orientalis</i> indicates a distinct trophic niche, although its resource utilization was not entirely segregated from that of the two <i>Rana</i> species. Furthermore, large groups of both <i>Rana</i> species tended to exploit a wider variety of resources than smaller ones, whereas <i>B. orientalis</i> showed no isotopic sex differences. All three species displayed ontogenetic niche shifts, with <i>B. orientalis</i> increasingly relying on aquatic-origin resources, while the two <i>Rana</i> species shifting toward terrestrial-origin resources. These findings provide insight into the trophic dynamics of forest-dwelling anurans and may serve as a baseline for ecological and conservation research in the future.</p>

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Trophic niche partitioning among three sympatric anuran species in a South Korean forest ecosystem based on stable isotope analysis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月14日

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  • Su–Yeon Lee,
  • Jae–Young Song,
  • Kyo Soung Koo,
  • Jinbae Seung,
  • Chang–Yong Choi

摘要

Stable isotope analysis (SIA) is a powerful tool for assessing resource use and trophic structure, enhancing understanding of coexistence mechanisms among sympatric species. In this study, we analyzed carbon (δ¹³C) and nitrogen (δ¹⁵N) stable isotopes in bone collagen of three coexisting anuran species—Bombina orientalis, Rana uenoi, and R. huanrenensis—from South Korean forest to evaluate their isotopic niches, resource partitioning, and within-population variation. Rana uenoi and R. huanrenensis utilized a broad range of resources with high overlap, suggesting they likely share dietary habits and occupy similar trophic roles. In contrast, relative δ¹⁵N enrichment of B. orientalis indicates a distinct trophic niche, although its resource utilization was not entirely segregated from that of the two Rana species. Furthermore, large groups of both Rana species tended to exploit a wider variety of resources than smaller ones, whereas B. orientalis showed no isotopic sex differences. All three species displayed ontogenetic niche shifts, with B. orientalis increasingly relying on aquatic-origin resources, while the two Rana species shifting toward terrestrial-origin resources. These findings provide insight into the trophic dynamics of forest-dwelling anurans and may serve as a baseline for ecological and conservation research in the future.