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. 2019 Feb 21;10:205. doi: 10.3389/fpls.2019.00205

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Copyright © 2019 Göttlinger, Schwerdtfeger, Tiedge and Lohaus.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Concentrations of different compounds in nectar of all analyzed bromeliad species. The data are arranged by the nocturnal and diurnal pollinators of the species. The nocturnal bromeliads include 22 chiropterophilous and 2 sphingophilous species. The diurnal bromeliads include 107 trochilophilous, 8 trochilophilous/ entomophilous, and 8 psychophilous species. Boxplot diagrams illustrating the following components: sugars (A), amino acids (B), inorganic cations (C), and inorganic anions (D). The boxplots show medians (horizontal line in box) and means (× in box). Different letters represent significant differences in each sugars (glucose, fructose, sucrose), amino acids (sum amino acids, glutamine, and asparagine, proline, essential amino acids, residual amino acids), cations (potassium, sodium, magnesium, calcium), and anions (chloride, phosphate, sulfate) between the different pollination groups (Tukey’s HSD; p < 0.05).