Invasive Species Expansion in Aquatic Ecosystems: Exploring Ecological Consequences and Adaptive Management Strategies

Aquatic ecosystems are increasingly threatened by invasive species that alter environmental conditions, native biodiversity, ecosystem functioning, and ecological stability. This study aims to examine invasive-species expansion in aquatic ecosystems, evaluate its ecological consequences, identify major invasion drivers, and assess the effectiveness of adaptive management strategies. An integrated ecological research design was employed using invasive-species assessment, environmental monitoring, biodiversity evaluation, ecosystem-function assessment, comparative analysis, and adaptive management evaluation. Invasion intensity was examined across low, moderate, high, and very high categories using species density, biomass, percentage cover, water-quality parameters, native biodiversity indicators, and correlation analysis. Results showed that invasive-species density increased from 18.6 to 69.4 ind./m², while biomass increased from 145 to 583 g/m² and percentage cover from 12.4% to 63.7%. Native species richness declined from 42 to 21 species, and Shannon diversity decreased from 3.42 to 2.14. Dissolved oxygen declined to 5.4 mg/L, whereas turbidity and nutrient concentration increased to 34.8 NTU and 1.31 mg/L, respectively. Adaptive management reduced invasive abundance by 45.8%, increased native species richness by 61.9%, and improved Shannon diversity by 36.0%. The findings demonstrate that invasive-species expansion is strongly associated with ecological degradation, while integrated control, habitat restoration, and continuous monitoring can support ecosystem recovery. The study recommends adaptive, evidence-informed management approaches that integrate invasion control with biodiversity conservation and long-term ecological monitoring.