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ECOTOXICOLOGICAL ASSESSMENT OF PESTICIDES IN THE JIUL DE EST BASIN пїЅ UNVEILING SEASONAL DYNAMICS AND BIODIVERSITY THREATS
Abstract
The research investigates the impact of persistent organic pollutants, particularly pesticides, on the aquatic ecosystems of the Jiul de Est basin. Pesticides are introduced into water bodies via surface runoff, infiltration, and atmospheric deposition, and their bioavailability is influenced by factors such as pH, temperature, and dissolved organic matter. The research evaluates the ecotoxicological effects on key aquatic species, including Salmo trutta fario (river trout) and Squalius cephalus (common chub), by assessing sensitivity to various pesticides. These chemicals are classified by toxicity levels using LD50 values and are further analyzed with an ecological impact index (Ie) defined as the ratio of measured concentrations to LC50 values. Seasonal variations show lower pesticide levels during summer and increased risks in autumn, reflecting the influence of climatic conditions and agricultural practices. Although pesticide concentrations generally remain within regulatory limits, the cumulative effects and seasonal fluctuations highlight potential threats to biodiversity. The ecological impact index (Ie) offers a detailed risk assessment, categorizing impacts into high, moderate, and low levels based on numerical thresholds. Despite compliance with legal standards, the findings underscore the critical need for proactive environmental surveillance and implementing targeted management strategies to mitigate the long-term adverse effects on aquatic ecosystems.
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References5
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