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<p>This study aimed to conduct the first integrated ecological assessment of the tropical Kullursandai Reservoir, India, by evaluating the interrelationships between water quality, fish diversity, invasive species, and fishery productivity. Over a 24-month period, we monitored key physico-chemical parameters, conducted comprehensive fish sampling, and analyzed historical catch data. Multivariate statistics, including principal component analysis (PCA), were used to identify dominant environmental drivers. Results revealed distinct seasonal patterns in water quality, with the reservoir maintaining a mesotrophic status. The fish assemblage was dominated by invasive Tilapia (<i>Oreochromis</i>&#xa0;spp.), which collectively constituted nearly half of the total catch, indicating a significant shift in community structure and potential ecological risks. Despite this, fish diversity indices indicated a moderately diverse and structured community. A notable finding was the substantial discrepancy between the theoretical maximum sustainable yield (8.33–12.82&#xa0;kg/ha/yr) and the actual fishery yield (mean 153&#xa0;kg/ha/yr), highlighting the role of adaptive management and favorable hydrology. PCA identified three key environmental gradients regulating the ecosystem: mineral-alkalinity, transparency-oxygen, and nutrient enrichment, with phosphorus levels strongly linked to tilapia dominance. Collectively, these results demonstrate that this study provides critical thresholds for guiding nutrient monitoring, invasive species control, and sustainable harvest strategies in tropical reservoirs, underscoring the delicate trade-off between high fishery production and biodiversity conservation.</p>

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Multivariate assessment of water quality, fish diversity, tilapia invasion, productivity, and yield relationships in a tropical reservoir

  • 期刊论文

  • 发表日期：

    2025年12月9日

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  • Mogalekar Havagiappa Sharnappa,
  • Swami Aarti Mallayya

摘要

This study aimed to conduct the first integrated ecological assessment of the tropical Kullursandai Reservoir, India, by evaluating the interrelationships between water quality, fish diversity, invasive species, and fishery productivity. Over a 24-month period, we monitored key physico-chemical parameters, conducted comprehensive fish sampling, and analyzed historical catch data. Multivariate statistics, including principal component analysis (PCA), were used to identify dominant environmental drivers. Results revealed distinct seasonal patterns in water quality, with the reservoir maintaining a mesotrophic status. The fish assemblage was dominated by invasive Tilapia (Oreochromis spp.), which collectively constituted nearly half of the total catch, indicating a significant shift in community structure and potential ecological risks. Despite this, fish diversity indices indicated a moderately diverse and structured community. A notable finding was the substantial discrepancy between the theoretical maximum sustainable yield (8.33–12.82 kg/ha/yr) and the actual fishery yield (mean 153 kg/ha/yr), highlighting the role of adaptive management and favorable hydrology. PCA identified three key environmental gradients regulating the ecosystem: mineral-alkalinity, transparency-oxygen, and nutrient enrichment, with phosphorus levels strongly linked to tilapia dominance. Collectively, these results demonstrate that this study provides critical thresholds for guiding nutrient monitoring, invasive species control, and sustainable harvest strategies in tropical reservoirs, underscoring the delicate trade-off between high fishery production and biodiversity conservation.