Seasonal Response of Grasslands to Climate Change Figure 9. Correlations of monthly temperatures (left) and precipitation (right) with the timing of grassland senescence on the Tibetan Plateau, according to Partial Least Squares (PLS) regression. For each variable, pixels for which the variable-importance-in-the- projection score was,0.8 are shown in gray. Pixels with insufficient data for PLS analysis are shown in white. doi:10.1371/journal.pone.0049230.g009 PLOS ONE | www.plosone.org 10 November 2012 | Volume 7 | Issue 11 | e49230