Predicting warming impacts on pollinators is key for understanding and preserving biodiversity and ecosystem services under climate change. In the tropics, where most species exist, insect pollination is essential for functioning forests. However, the vulnerability of tropical insect pollinators such as bees to climate change is understudied. Existing studies lack links between thermal physiological metrics to pollination services. We quantified physiological heat tolerance, behavioural thermoregulation abilities, and their links to species role played in flower-visitation network for a tropical native bee community across different seasons. Physiological tolerance from 708 individuals of 92 bee species revealed strong phylogenetic signals and Halictidae exhibited ~3 ℃ lower heat tolerance than other bees in the hot-dry season when heat stress is the highest. Further quantification of body temperatures revealed Halictidae also had weaker ability to maintain stable body temperatures. Analyzing extensively sampled networks showed specialization index of bees, which is associated with pollination efficacy, was negatively correlated with heat tolerance in the hot-dry season. Specialized Halictidae interactions are therefore potentially more vulnerable to temperature rises, potentially leading to increasingly dominant generalized interactions in the future under climate change.