Pollinator selection by floral traits and color in a hybrid zone of <i>Ipomopsis aggregata</i> and <i>I. tenuituba</i> (Polemoniaceae)

Abstract

Albinos plants are usually discriminated by their pollinators. Exist the possibility that other pollinator drive a reproductive isolation on this plants. To observe if an albino of a plant commonly pollinated by hummingbirds can be selected by other pollinator we used the F1s of albinos of Ipomopsis aggregata and hybrids of them and I. tenuituba. We performed two experimental arrays to observed the selection of the hummingbirds and hawkmoths. The first array was a pale array where we selected albino and hybrid plants with pale flowers. The second array was the opposite, the plants selected were albino and hybrid plants with dark flowers. Also, both arrays had wild types of I. aggregata and I. tenuituba. In both arrays the hummingbird prefered the dark flowers but in the second array they visited the hybrids almost the same as the I. aggregata wild types. The hawkmoths were presented only for the first array where they did not show any preference by the color of the flowers. The hawkmoth can establish a population of albino I. aggregata or at less maintain their genes in the populations of I. aggregata.

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