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. 2019 Apr 3;6(4):190279. doi: 10.1098/rsos.190279

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© 2019 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 2. — Comparison of hand- versus honeybee-collected pollen for (a) H. annuus, ‘Black Oil Seed’, (b) H. annuus, Germany, (c) H. annuus, wild California and (d) comparison pooled across all Asteraceae taxa used in the experiment (17 treatments). Asterisks (*) denote statistically significant differences between collection method. Standard errors were calculated by back-transforming least-square means plus or minus least-square mean standard errors.