Apis cerana indica as Integrative Bioindicator of Environmental Pollution

Environmental pollution is spatially heterogeneous and temporally dynamic, creating a need for monitoring approaches that capture both contaminant concentrations and their biological availability. Honey bees offer such an integrative approach because repeated foraging connects colonies to vegetation, soil, water and atmospheric compartments across the surrounding landscape, and contaminants they encounter may be transported and redistributed among bees and hive products. This review evaluates the potential of honey bees, with particular emphasis on the indigenous Apis cerana indica, as integrative environmental bioindicators. It develops a framework linking landscape structure, floral resources, foraging behaviour, contaminant exposure, accumulation in hive matrices and colony-level responses. Pesticides, heavy metals and trace elements, industrial and traffic emissions, biomass-burning products and soil-derived contaminants may reach bees through multiple pathways. Detection alone, however, does not establish source, dose or biological effect; brood development, food storage, foraging activity, hive weight and temperature provide complementary evidence of stress, and interpretation is strengthened when these are linked with landscape, floral composition, weather and colony condition. Analytical reliability depends on representative sampling, matrix-specific extraction, appropriate instrumental analysis, quality assurance and careful treatment of detection limits and background concentrations. Most evidence comes from Apis mellifera, whereas species-specific baselines, exposure kinetics and biological thresholds remain limited for A. cerana indica. Repeated, landscape-stratified, multi-matrix monitoring supported by melissopalynology, environmental reference measurements and standardized colony observations could establish this species as a regionally relevant biomonitor across heterogeneous South Asian landscapes.