Summary of spontaneous fermentations.

<p>Bars indicate the average fermentation duration of must samples that underwent a spontaneous fermentation in each of the vineyards (1–16) and for all grape varieties (A–H) in sampling year 1 (open circles) and 2 (closed circles). The light grey part of the bars indicates the average number of days until the beginning of fermentation (lag time, corresponding to a weight loss of 2 gl⁻¹), whereas the dark grey part indicates the average days of fermentation (corresponding to a weight loss from 2 gl-1 to 70 gl⁻¹). The average number of <i>S. cerevisiae</i> strains from sampling years 1 and 2 is also indicated, as well as average lag and fermentation times for samples from all grape varieties. The number of spontaneous fermentations for each variety/vineyard combination is given in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0032507#pone-0032507-t001" target="_blank">Table 1</a>.