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<p>This study used DNA metabarcoding to study the diet of the narrow-ridged finless porpoise (<i>Neophocaena asiaeorientalis sunameri</i>) using stomach content analysis from naturally stranded individuals. High-throughput sequencing of four samples (N1–N4) revealed different diets among individuals. We found a variety of prey taxa, with some individuals having diets mostly consisting of specific taxa (<i>Platyhelminthes</i> in N1 and N2 and <i>Chordata</i> in N3), while others had more diverse diets (N4 consumed <i>Arthropoda</i>, <i>Ochrophyta</i>, <i>Chordata</i>, and other taxa). Shannon diversity of diet communities varied between 0.001 ± 0.002 (N1) and 0.93 ± 0.21 (N4). <i>Clonorchis sinensis</i> (liver fluke) in three individuals suggested parasitism or consumption of parasitized prey. Species-level analysis revealed distinct dietary compositions with little overlap between individuals, implying possible niche partitioning within the population. N3 fed predominantly on pelagic fish, whereas N4 used a broad dietary niche that included benthic, zooplankton, and primary producers. These results indicate opportunistic feeding and individual dietary specialization in <i>N. a. sunameri</i>, which has important implications for conservation efforts to protect this threatened cetacean species.</p>

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Individual specialization in narrow-ridged finless porpoise (Neophocaena asiaeorientalis sunameri) diet revealed through DNA metabarcoding

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Ga Young Jo,
  • Thodhal Yoganandham Suman,
  • Sung Bin Lee,
  • Jinyoung Park,
  • Ihn-Sil Kwak

摘要

This study used DNA metabarcoding to study the diet of the narrow-ridged finless porpoise (Neophocaena asiaeorientalis sunameri) using stomach content analysis from naturally stranded individuals. High-throughput sequencing of four samples (N1–N4) revealed different diets among individuals. We found a variety of prey taxa, with some individuals having diets mostly consisting of specific taxa (Platyhelminthes in N1 and N2 and Chordata in N3), while others had more diverse diets (N4 consumed Arthropoda, Ochrophyta, Chordata, and other taxa). Shannon diversity of diet communities varied between 0.001 ± 0.002 (N1) and 0.93 ± 0.21 (N4). Clonorchis sinensis (liver fluke) in three individuals suggested parasitism or consumption of parasitized prey. Species-level analysis revealed distinct dietary compositions with little overlap between individuals, implying possible niche partitioning within the population. N3 fed predominantly on pelagic fish, whereas N4 used a broad dietary niche that included benthic, zooplankton, and primary producers. These results indicate opportunistic feeding and individual dietary specialization in N. a. sunameri, which has important implications for conservation efforts to protect this threatened cetacean species.