Pollinator service only depends on nectar production rates in sparse populations.

Abstract excerpt

As predicted, approach rate by bumblebees is strongly related to the nectar production rate of Echium vulgare plants in a sparse population, while in a dense population such a relationship is completely absent. These findings are confirmed by additional experiments with potted plants that were placed inside and outside a natural population. The results suggest that the direction of selection on nectar production...

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