Hybridization and pollinator behavior in <i>Castilleja</i> (Orobanchaceae)

Abstract

Hybridization between interspecific angiosperms is common, yet the initial stages are rare (REF- is this even true????). One of the factors that aeffects the rate of hybridization is the behavior of pollinators responsible for transferring pollen and fertilizing the flowers – only for some plants. Pollinator behavior can facilitate assortative or disassortative mating. We studied pollinator behavior using artificial floral arrays to see if the presence of hybrids in an area changed – we actually did not look at this since we didn’t do arrays w/o hybrids- the patterns of movement and proportion of time spent on certain flowers. We also performed hand-crossings to study hybrid fertility. Hybrids set fruit in combination with parent species and other hybrids. Pollinators generally lacked constancy in areas with hybrids- don’t really have a basis for this since only did it in areas with hybrids-. Disassortative pollen transfer could result in the production of hybrid offspring (do you mean later generations?), increasing the rate of hybridization in the area.

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