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<p>The carp-like fish Potanin’s Altai Osman <i>Oreoleuciscus potanini</i> inhabits the Central Asian Internal Drainage Basin in Mongolia. The lakes and rivers of this basin have relatively low bio-productivity and fish species diversity, which is compensated by a high diversity of intraspecific forms. <i>O. potanini</i> has four intraspecific forms, differing in morphology and ecology. The most abundant form is the herbivorous form, whose gut content mainly (up to 80%) consists of the stonewort algae <i>Chara</i> spp. However, it remains unknown whether <i>O. potanini</i> digests and assimilates these algae. To clarify this issue, we used stable isotope analysis (SIA) and fatty acid (FA) analysis, which allow us to study assimilated food. SIA revealed that <i>O. potanini</i> obtained bulk carbon from periphytic microalgae rather than from <i>Chara</i> spp. FA analysis generally confirmed the results of SIA. Specifically, biomarker FAs of diatom algae were found in the biomass of <i>O. potanini</i>, while characteristic biomarkers of <i>Chara</i> spp. were absent. Thus, the herbivorous form of <i>O. potanini</i> appeared to ingest stoneworts for assimilating periphytic microalgae during gut passage.</p>

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Ingested vs. digested: what do Potanin’s Altai Osmans (Cypriniformes, Leuciscidae) really eat?

  • 期刊论文

  • 发表日期：

    2025年2月5日

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  • Yuri Yu Dgebuadze,
  • Nadezhda N. Sushchik,
  • Dondogdorj Altansukh,
  • Bud Mendsaikhan,
  • Anna Yu Emelianova,
  • Michail I. Gladyshev

摘要

The carp-like fish Potanin’s Altai Osman Oreoleuciscus potanini inhabits the Central Asian Internal Drainage Basin in Mongolia. The lakes and rivers of this basin have relatively low bio-productivity and fish species diversity, which is compensated by a high diversity of intraspecific forms. O. potanini has four intraspecific forms, differing in morphology and ecology. The most abundant form is the herbivorous form, whose gut content mainly (up to 80%) consists of the stonewort algae Chara spp. However, it remains unknown whether O. potanini digests and assimilates these algae. To clarify this issue, we used stable isotope analysis (SIA) and fatty acid (FA) analysis, which allow us to study assimilated food. SIA revealed that O. potanini obtained bulk carbon from periphytic microalgae rather than from Chara spp. FA analysis generally confirmed the results of SIA. Specifically, biomarker FAs of diatom algae were found in the biomass of O. potanini, while characteristic biomarkers of Chara spp. were absent. Thus, the herbivorous form of O. potanini appeared to ingest stoneworts for assimilating periphytic microalgae during gut passage.