Fig 3. Positive feedback for increased or decreased nectar production. If pollinators are scarce relative to plant pollination needs, nectar conditions will be good for pollinators. However, rather than being selected to produce less nectar, which would put the supply and demand of nectar into a better balance, plants are actually selected to make more nectar to attract the scarce pollinators in competition with other plants. The reverse situation occurs when pollinators are abundant. Natural selection will favour lower nectar production by plants, which results in worse nectar conditions for pollinators.