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Effect of marker genotype for the major nectar QTL (RAPD marker L04co; ref. 22) on nectar volume per flower (A), and the visitation rate (visits per flower per day) of hummingbirds (B) and bees (C). Genotypes are: LL, individuals homozygous for the M. lewisii allele (n = 61); LC, heterozygotes (n = 130); CC, individuals homozygous for the M. cardinalis allele (n = 36). Bars denote the mean + 2 SE, and bars with different letters identify means that are significantly different (P < 0.01) based on Mann–Whitney U tests corrected for multiple comparisons (31).