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Abstract <p>Nematode communities in the Ray River system were investigated in the dry and wet seasons. The construction of an irrigation dam on the Ray River formed an artificial lake to supply freshwater for regional domestic activities. Sampling included five stations in river habitat and four stations in the lake habitat to compare nematode community structures and assess differences between the two ecosystems within the same river basin. Results revealed significant differences in community composition at the genus, family, and order levels. Certain taxonomic groups exhibited distinct distribution patterns, with higher densities and diversity restricted to either lake or river habitats. Community characteristics–including density, genus richness, Shannon diversity index, Margalef richness index, Hill indices, and Hurlbert’s ES(50)–were measured and showed pronounced disparities between the Ray Lake and Ray River, particularly during the wet season. These differences were attributed to dam-induced transformation of the upstream river section into a lentic (lake) ecosystem. Through nematode community analysis, the ecological impacts of the dam on river habitats were clearly demonstrated. This study highlights the sensitivity of nematodes to dam-related environmental changes, underscoring their potential utility as bioindicators for future environmental monitoring and management strategies.</p>

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Change in Nematode Communities’ Structure and Diversity in the Ray River Ecosystem Due to Artificial Barrage Impact, Ba Ria—Vung Tau Province

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Thai T. Tran,
  • My Yen T. Nguyen,
  • Dong X. Nguyen,
  • Hai Yen T. Nguyen,
  • Bijeesh Kozhikkodan Veettil,
  • Hung M. Nguyen,
  • Quang X. Ngo

摘要

Abstract

Nematode communities in the Ray River system were investigated in the dry and wet seasons. The construction of an irrigation dam on the Ray River formed an artificial lake to supply freshwater for regional domestic activities. Sampling included five stations in river habitat and four stations in the lake habitat to compare nematode community structures and assess differences between the two ecosystems within the same river basin. Results revealed significant differences in community composition at the genus, family, and order levels. Certain taxonomic groups exhibited distinct distribution patterns, with higher densities and diversity restricted to either lake or river habitats. Community characteristics–including density, genus richness, Shannon diversity index, Margalef richness index, Hill indices, and Hurlbert’s ES(50)–were measured and showed pronounced disparities between the Ray Lake and Ray River, particularly during the wet season. These differences were attributed to dam-induced transformation of the upstream river section into a lentic (lake) ecosystem. Through nematode community analysis, the ecological impacts of the dam on river habitats were clearly demonstrated. This study highlights the sensitivity of nematodes to dam-related environmental changes, underscoring their potential utility as bioindicators for future environmental monitoring and management strategies.