Pollen counting made easy: mobile pollen counter provides real-time results in the field

Understanding pollen release dynamics is essential for studying plant reproductive strategies, particularly in systems where pollen is aerosolized, such as wind- and buzz-pollinated flowers. Yet quantifying airborne pollen is often labor-intensive and dependent on laboratory-based methods, limiting field research. We demonstrate that a handheld air particle counter can provide rapid, portable, and precise quantification of pollen in real-time across pollination systems. Using controlled vibration experiments on buzz-pollinated Melastomataceae stamens, we compared counts from the handheld device with a conventional liquid particle counter. The handheld counter produced more consistent and realistic estimates, probably due to its ability to capture dispersed pollen clouds regardless of release direction. High-speed video confirmed that traditional methods can miss substantial pollen because of directional variability in complex stamens. We demonstrate that the device is applicable beyond buzz pollination by quantifying the exponential decline in airborne pollen concentration from wind-pollinated Betula anthers with increasing distance. The device also enabled fine-scale characterization of pollen size distributions and real-time release rates. The method proved robust to variations in pollen concentration and particle speed. Beyond pollen, this approach has potential for quantifying airborne particles such as spores, seeds, and pathogens, expanding opportunities for experimental field studies of airborne particle dispersal and plant reproductive evolution.