B2O3 Chlorella pyrenoidosa DPSIR Eriocheir sinensis Microcystis aeruginosa Moran’s I N-doped films TiO2/C3N4 WHO Global Air Quality Guidelines adaptation capability adsorption air pollution transmission channels alpine lakes ambient air quality standards biofilm resilience co-occurrence network confidence threshold method connections degradation ecological risk enrofloxacin environmental factors eutrophic lakes fish species heavy metal machine learning microbial community molten nutrient enrichment parameter selection