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Abstract <p>A large population of parasitic copepods (103 ind./m<sup>2</sup>) was found in the littoral zone of an oxbow of the Lyutoga River (Southern Sakhalin), which remains connected to the main channel. The highest density (98 ind./m<sup>2</sup> was recorded for <i>Ergasilus briani</i> Markewitsch, 1933, a species widespread in Eurasia but previously not reported from Southern Sakhalin, having been documented only in a single water body in northwestern Sakhalin (Lake Sladkoye). The abundance of the second ergasilid species, <i>Thersitina gasterostei</i> (Pagenstecher, 1861), was substantially lower (5 ind./m<sup>2</sup>). While <i>T. gasterostei</i> has been previously recorded in Southern Sakhalin, this finding is the first for the Lyutoga River. The high abundance of free-living stages of ergasilids is presumably associated with sampling during the peak of the reproductive season and the hydrological features of the collection site (a littoral area with slow current and dense macrophyte vegetation).</p>

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On the Discovery of Large Population of Free-Living Stages of Ergasilids (Copepoda, Cyclopoida) in the Lyutoga River of Southern Sakhalin

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • O. A. Chaban,
  • V. R. Alekseev

摘要

Abstract

A large population of parasitic copepods (103 ind./m2) was found in the littoral zone of an oxbow of the Lyutoga River (Southern Sakhalin), which remains connected to the main channel. The highest density (98 ind./m2 was recorded for Ergasilus briani Markewitsch, 1933, a species widespread in Eurasia but previously not reported from Southern Sakhalin, having been documented only in a single water body in northwestern Sakhalin (Lake Sladkoye). The abundance of the second ergasilid species, Thersitina gasterostei (Pagenstecher, 1861), was substantially lower (5 ind./m2). While T. gasterostei has been previously recorded in Southern Sakhalin, this finding is the first for the Lyutoga River. The high abundance of free-living stages of ergasilids is presumably associated with sampling during the peak of the reproductive season and the hydrological features of the collection site (a littoral area with slow current and dense macrophyte vegetation).