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. 2021 Jan 20;11:611877. doi: 10.3389/fpls.2020.611877

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Copyright © 2021 Eilers, Kleine, Eckert, Waldherr and Müller.

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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Duration of stay of florivorous beetles (Olibrus spp.) above olfactometer fields without flower head (control, mean values of both control fields), with premature flower head (prior anthesis), or with mature flower head (post anthesis) of five Tanacetum vulgare chemotypes. Four beetle trials were conducted for each plant individual and data were averaged to the plant individual level prior display and statistical comparison to avoid pseudoreplication. The boxplots show the median (horizontal line), mean (filled circle), first and third quartiles (hinges), and 1.5 of inter-quartile ranges (whiskers). Jitters (pink dots) display individual observations. Asterisks indicate significant differences between the three chambers (control, premature and mature flower heads). Significance levels of LMM: ***P < 0.001; **P < 0.01. For detailed statistical comparison of data, see Supplementary Table S3.