Functional pollinators and morph ratio in Narcissus

Functional pollinators and morph ratio in Narcissus

Functional pollinators and morph ratio in Narcissus

Heterostyly and related style polymorphisms are good model systems to evaluate the importance of functional pollinators in the maintenance of population variability. Santos-Gally et al. study floral traits in style-dimorphic Narcissus papyraceus in the south-west of the Iberian Peninsula and north-west Africa in relation to visitation rates by long- versus short-tongued pollinators. They find that allometric effects of discrete variation in flower size are associated with variation in reciprocity, but neither tube length or stigma–anther separation account for morph-ratio variation. Loss of stylar polymorphism in populations is correlated with high visitation rates of short-tongued pollinators, which suggests that their abundance may overwhelm any possible effects of long-tongued pollinators.

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