Pollen foraging behaviour of solitary Hawaiian bees revealed through molecular pollen analysis

Endemic Hawaiian Hylaeus bees exhibit remarkable pollen foraging fidelity, predominantly collecting native plant species despite the availability of multiple floral resources. Molecular genetic analysis revealed that at high elevations in Haleakala, 86% of pollen samples from bee crops originated from the Hawaiian silversword (Argyroxiphium sandwicense subsp. macrocephalum), while lower elevations exclusively featured pukiawe (Leptecophylla tameiameiae) pollen. This selective foraging behavior was consistent across 21 Hylaeus specimens, with 100% of identified pollen loads being native. The study employed molecular methods to bypass traditional palynological challenges, offering a high-throughput approach for assessing pollinator-plant interactions without specialized expertise. These findings highlight the potential for similar analyses to inform conservation strategies and expand our understanding of global pollination dynamics.

WILSON, E. E., SIDHU, C. S., LeVAN, K. E., & HOLWAY, D. A. (2010). Pollen foraging behaviour of solitary Hawaiian bees revealed through molecular pollen analysis. Molecular Ecology, 19(21), 4823–4829. Portico. https://doi.org/10.1111/j.1365-294x.2010.04849.x