Nectar sugars and amino acids in day- and night-flowering Nicotiana species are more strongly shaped by pollinators' preferences than organic acids and inorganic ions.

If all chemical classes (sugars, amino acids, inorganic anions, inorganic cations, and malate) were taken into account, there is a highly significant ( p < 0.001) difference between the individual pollinator groups and between the individual sections.

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