Rescue of stranded pollen grains by secondary transfer
Abstract
Secondary transfer of pollen can occur when a second pollinator remobilizes grains that had already been transferred to a flower by a previous pollinator. We used a pollen-color dimorphism to measure components of secondary transfer by bumble bees visiting the lily Erythronium grandiflorum. Remobilization was surprisingly high, ranging from 20% of grains deposited on stigmas to 90% of grains deposited on inner tepal surfaces. Because most of the grains that are remobilized would otherwise have been stranded on non- stigmatic surfaces, secondary transfer has the beneficial effect of returning lost grains to circulation.
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