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<p>The present study was carried out to assess the effect of short-term ecological alteration on fish diversity of River Siang, Arunachal Pradesh in the Eastern Himalayas. Fish diversity of six stations along the river (Puging, Yingkiong, Boleng, Komsing, Pasighat and Oiramghat) was assessed across pre-monsoon, monsoon and post-monsoon seasons along with major physicochemical attributes of water. We recorded 78 fish species belonging to 48 genera under 17 families. On a spatial scale, the maximum number of species was recorded from Oiramghat (65 species) followed by Pasighat (56 species) along the lower stretch of the river. The family, Cyprinidae formed more than one-fourth (26.92%) of the total number of species followed by Danionidae (21.79%), Bagridae and Sisoridae (7.69% each), and Channidae (6.41%). During 2017–2018 the river faced a sudden, high-turbidity event, leading to drastic changes in water quality. However, the situation improved in the following years (2018–2020). Fish diversity indices (Shannon H') were significantly lower during the impaired period (2017–2018) but recovered in subsequent years. A total of 31 species under 10 families were reported from the river during the year 2017–2018 (impaired period), which increased to 60 species under 15 families in 2018–2019 and 78 species under 17 families in 2019–2020. A total of 11 water quality variables were also analyzed during the study period (2017–2020). Significant variations were recorded in mean values of transparency, turbidity, and total chlorophyll between 2017–2018 and 2018–2019 and 2019–2020 (<i>p</i> &lt; 0.05). Statistical analysis affirmed that water quality attributes like depth, pH, dissolved oxygen, and turbidity have strong association with fish community compositions in the river. Our results demonstrate the resilience of fish assemblages in the Siang River, relative to the post-disturbance impaired period, suggesting that short-term ecological degradation may not lead to long-term biodiversity loss in large, well-connected fluvial systems, likely due to movements to and from tributary refugia.</p>

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Resilience of fish assemblages to a short-term perturbation: a case study of the Siang River in the Eastern Himalayas

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Simanku Borah,
  • Pranab Gogoi,
  • Kavita Kumari,
  • Shyamal Chandra Sukla Das,
  • Amulya Kakati,
  • Bipul Chandra Ray,
  • Birendra Kumar Bhattacharjya,
  • Sanjoy Kumar Das,
  • Srikanta Samanta,
  • Vettath Raghavan Suresh,
  • Sullip Kumar Majhi,
  • Basanta Kumar Das

摘要

The present study was carried out to assess the effect of short-term ecological alteration on fish diversity of River Siang, Arunachal Pradesh in the Eastern Himalayas. Fish diversity of six stations along the river (Puging, Yingkiong, Boleng, Komsing, Pasighat and Oiramghat) was assessed across pre-monsoon, monsoon and post-monsoon seasons along with major physicochemical attributes of water. We recorded 78 fish species belonging to 48 genera under 17 families. On a spatial scale, the maximum number of species was recorded from Oiramghat (65 species) followed by Pasighat (56 species) along the lower stretch of the river. The family, Cyprinidae formed more than one-fourth (26.92%) of the total number of species followed by Danionidae (21.79%), Bagridae and Sisoridae (7.69% each), and Channidae (6.41%). During 2017–2018 the river faced a sudden, high-turbidity event, leading to drastic changes in water quality. However, the situation improved in the following years (2018–2020). Fish diversity indices (Shannon H') were significantly lower during the impaired period (2017–2018) but recovered in subsequent years. A total of 31 species under 10 families were reported from the river during the year 2017–2018 (impaired period), which increased to 60 species under 15 families in 2018–2019 and 78 species under 17 families in 2019–2020. A total of 11 water quality variables were also analyzed during the study period (2017–2020). Significant variations were recorded in mean values of transparency, turbidity, and total chlorophyll between 2017–2018 and 2018–2019 and 2019–2020 (p < 0.05). Statistical analysis affirmed that water quality attributes like depth, pH, dissolved oxygen, and turbidity have strong association with fish community compositions in the river. Our results demonstrate the resilience of fish assemblages in the Siang River, relative to the post-disturbance impaired period, suggesting that short-term ecological degradation may not lead to long-term biodiversity loss in large, well-connected fluvial systems, likely due to movements to and from tributary refugia.